Gr 9 NATURAL SCIENCES: CH 2.3 SUM Reaction of metals with oxygen
240 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What type of chemical reaction occurs when iron reacts with oxygen?

  • Oxidation
  • Synthesis
  • Decomposition
  • Combustion (correct)

    • What is steel wool made of?

  • Very fine aluminum threads
  • Very fine copper threads
  • Very fine iron threads
  • Very fine steel threads (correct)

    • What is the purpose of using steel wool in the demonstration of iron reacting with oxygen?

  • To change the color of the sparks
  • To reduce the heat released
  • To reduce the surface area
  • To increase the surface area (correct)

    • What is the product formed when iron reacts with oxygen?

    <p>Iron(III) oxide</p> Signup and view all the answers

    What is the balanced chemical equation for the combustion reaction of iron?

    <p>4Fe + 3O₂ → 2Fe₂O₃</p> Signup and view all the answers

    What is the state of oxygen in the air?

    <p>Gas</p> Signup and view all the answers

    What is the visual effect observed when iron or steel wool burns?

    <p>Bright orange sparks</p> Signup and view all the answers

    What is the energy released during the combustion reaction felt as?

    <p>Heat</p> Signup and view all the answers

    What is the product formed when iron reacts with oxygen?

    <p>Iron oxide (Fe₂O₃)</p> Signup and view all the answers

    What is the formula for magnesium oxide?

    <p>MgO</p> Signup and view all the answers

    What is the purpose of coefficients in chemical equations?

    <p>To balance the number of atoms on both sides</p> Signup and view all the answers

    What is the general equation for Group 2 metals reacting with oxygen?

    <p>2M + O₂ → 2MO</p> Signup and view all the answers

    What is the formula for sodium oxide?

    <p>Na₂O</p> Signup and view all the answers

    What is the term for the gradual destruction of materials by chemical reaction?

    <p>Corrosion</p> Signup and view all the answers

    What is the primary component of rust?

    <p>Iron oxide (Fe₂O₃)</p> Signup and view all the answers

    What factor accelerates the rusting process?

    <p>Moisture</p> Signup and view all the answers

    What is the primary purpose of using fine steel threads in combustion reactions?

    <p>To increase the surface area for the reaction</p> Signup and view all the answers

    What is the term for the device used to produce a brief burst of bright light in photography?

    <p>Camera Flash</p> Signup and view all the answers

    What is the product of the combustion reaction of magnesium in air?

    <p>Magnesium oxide</p> Signup and view all the answers

    What is the symbolic representation of the reaction of magnesium with oxygen?

    <p>2Mg + O₂ → 2MgO</p> Signup and view all the answers

    What is the term for the process of magnesium reacting rapidly with oxygen in the air?

    <p>Combustion Process</p> Signup and view all the answers

    What is the general word equation for the reaction of metals with oxygen?

    <p>metal + oxygen → metal oxide</p> Signup and view all the answers

    What is the term for the substances formed as a result of a chemical reaction?

    <p>Products</p> Signup and view all the answers

    What is the term for compounds formed when metals react with oxygen?

    <p>Metal oxides</p> Signup and view all the answers

    What accelerates the rusting process in saltwater environments?

    <p>High conductivity</p> Signup and view all the answers

    Why are materials like wood or aluminum preferred over iron or steel in coastal areas?

    <p>They do not rust</p> Signup and view all the answers

    What is the primary reason why rust can be detrimental to metal structures?

    <p>It degrades their structural integrity</p> Signup and view all the answers

    What is the purpose of galvanizing iron or steel with a layer of zinc?

    <p>To provide a protective barrier against rust</p> Signup and view all the answers

    How does paint prevent rust from forming on metal surfaces?

    <p>By providing a protective barrier</p> Signup and view all the answers

    What is the result of iron reacting with oxygen in the air?

    <p>Formation of iron oxide</p> Signup and view all the answers

    Why is chromium often used to coat metal surfaces?

    <p>Because it does not react with oxygen</p> Signup and view all the answers

    What is the primary method of preventing rust from forming on metal surfaces?

    <p>By applying a protective barrier</p> Signup and view all the answers

    What happens when zinc reacts with oxygen?

    <p>It forms a dense protective layer that prevents further oxidation.</p> Signup and view all the answers

    What is the purpose of the zinc oxide layer formed on the surface of zinc?

    <p>To block oxygen and water from reaching the iron.</p> Signup and view all the answers

    What happens when the zinc coating is scratched?

    <p>The underlying zinc forms a new protective oxide layer.</p> Signup and view all the answers

    What is the common application of galvanised products?

    <p>In various applications, including construction and household items.</p> Signup and view all the answers

    What is the effect of salt in the air on the corrosion of iron?

    <p>It accelerates the corrosion of iron.</p> Signup and view all the answers

    What is the characteristic of zinc oxide that makes it an effective protective layer?

    <p>It is dense and non-porous, blocking oxygen and water.</p> Signup and view all the answers

    What is the effect of acids on the corrosion of iron?

    <p>They accelerate the corrosion of iron.</p> Signup and view all the answers

    In which environment does rusting occur more quickly?

    <p>In moist and corrosive environments.</p> Signup and view all the answers

    What is the primary reason why rust can be detrimental to metal structures?

    <p>It can significantly degrade the structural integrity and appearance of metal objects.</p> Signup and view all the answers

    Why are materials like wood or aluminum preferred over iron or steel in coastal areas?

    <p>They are more resistant to corrosion.</p> Signup and view all the answers

    What is the purpose of galvanizing iron or steel with a layer of zinc?

    <p>To make the metal more resistant to corrosion.</p> Signup and view all the answers

    How does paint prevent rust from forming on metal surfaces?

    <p>By providing a protective barrier that prevents oxygen from reaching the metal.</p> Signup and view all the answers

    What is the effect of salt in the air on the corrosion of iron?

    <p>It accelerates the corrosion process.</p> Signup and view all the answers

    Why is chromium often used to coat metal surfaces?

    <p>Because it forms a protective layer that prevents rust.</p> Signup and view all the answers

    What is the primary method of preventing rust from forming on metal surfaces?

    <p>All of the above.</p> Signup and view all the answers

    What is the effect of acids on the corrosion of iron?

    <p>They accelerate the corrosion process.</p> Signup and view all the answers

    What is the term for the chemical reaction that occurs when a substance reacts with oxygen, releasing energy in the form of light and heat?

    <p>Combustion</p> Signup and view all the answers

    What is the primary component of steel?

    <p>Iron</p> Signup and view all the answers

    What is the purpose of using fine steel threads in the demonstration of iron reacting with oxygen?

    <p>To increase the surface area</p> Signup and view all the answers

    What is the reactant that is a gas present in the air?

    <p>Oxygen</p> Signup and view all the answers

    What is the state of iron in the reactants?

    <p>Solid</p> Signup and view all the answers

    What is the product formed when iron reacts with oxygen?

    <p>Iron oxide</p> Signup and view all the answers

    What is the energy released during the combustion reaction?

    <p>Light and heat</p> Signup and view all the answers

    What is observed when iron shavings are placed in the flame of a Bunsen burner?

    <p>A bright orange spark</p> Signup and view all the answers

    What is the purpose of increasing the surface area of the reactant in a combustion reaction?

    <p>To make the reaction more noticeable</p> Signup and view all the answers

    What is the term for the substances that start a chemical reaction?

    <p>Reactants</p> Signup and view all the answers

    What is the result of the reaction of magnesium with oxygen?

    <p>Magnesium oxide and heat</p> Signup and view all the answers

    What is the symbolic representation of a chemical reaction?

    <p>Chemical equation</p> Signup and view all the answers

    What is the general word equation for the reaction of metals with oxygen?

    <p>Metal + oxygen → metal oxide</p> Signup and view all the answers

    What is the term for compounds formed when metals react with oxygen?

    <p>Metal oxides</p> Signup and view all the answers

    What is the purpose of safety precautions during combustion reactions?

    <p>To prevent intense heat and light</p> Signup and view all the answers

    What is observed when magnesium ignites?

    <p>A bright white flame</p> Signup and view all the answers

    What is formed when zinc reacts with oxygen?

    <p>Zinc oxide (ZnO)</p> Signup and view all the answers

    What is the primary purpose of galvanizing iron or steel with a layer of zinc?

    <p>To make it more resistant to corrosion</p> Signup and view all the answers

    What happens when the zinc coating is scratched?

    <p>A new protective oxide layer is formed to replace the damaged one</p> Signup and view all the answers

    What is the characteristic of zinc oxide that makes it an effective protective layer?

    <p>It is non-porous and blocks oxygen and water</p> Signup and view all the answers

    What is the effect of salt in the air on the corrosion of iron?

    <p>It accelerates the corrosion process</p> Signup and view all the answers

    What is the common application of galvanised products?

    <p>In the construction of buildings and bridges</p> Signup and view all the answers

    What is the effect of acids on the corrosion of iron?

    <p>It accelerates the corrosion process</p> Signup and view all the answers

    In which environment does rusting occur more quickly?

    <p>Moist and corrosive environments</p> Signup and view all the answers

    What is the general formula for the oxides formed by Group 1 metals?

    <p>M₂O</p> Signup and view all the answers

    What is the purpose of coefficients in chemical equations?

    <p>To balance the equation</p> Signup and view all the answers

    What is the product formed when magnesium reacts with oxygen?

    <p>MgO</p> Signup and view all the answers

    What is rust primarily composed of?

    <p>Iron oxide (Fe₂O₃)</p> Signup and view all the answers

    What factor accelerates the rusting process?

    <p>Moisture</p> Signup and view all the answers

    What is the chemical equation for the reaction of iron with oxygen?

    <p>4Fe + 3O₂ → 2Fe₂O₃</p> Signup and view all the answers

    What is the general equation for Group 2 metals reacting with oxygen?

    <p>2M + O₂ → 2MO</p> Signup and view all the answers

    What is the term for the gradual destruction of materials, usually metals, by chemical reaction with their environment?

    <p>Corrosion</p> Signup and view all the answers

    What is the general formula for metal oxides formed by Group 1 metals?

    <p>M2O</p> Signup and view all the answers

    What is the purpose of changing coefficients in balancing a chemical equation?

    <p>To ensure equal number of atoms on both sides</p> Signup and view all the answers

    What is the term for the reddish-brown flaky substance that forms on iron when it reacts with oxygen in the air?

    <p>Rust</p> Signup and view all the answers

    What is the chemical formula for iron(III) oxide?

    <p>Fe2O3</p> Signup and view all the answers

    What accelerates the rusting process?

    <p>Moisture</p> Signup and view all the answers

    What is the product formed when magnesium reacts with oxygen?

    <p>Magnesium oxide</p> Signup and view all the answers

    What is the term for the process of a material deteriorating due to chemical reaction with its environment?

    <p>Corrosion</p> Signup and view all the answers

    What is the chemical equation for the formation of rust?

    <p>4Fe + 3O2 + 6H2O → 4Fe(OH)3</p> Signup and view all the answers

    What is the primary reason why rusting occurs more quickly in coastal areas?

    <p>Due to the high humidity and salt content in the air</p> Signup and view all the answers

    What is the primary purpose of galvanizing iron or steel with a layer of zinc?

    <p>To provide a protective barrier against rust</p> Signup and view all the answers

    What is the effect of acids on the corrosion of iron?

    <p>It increases the rate of corrosion</p> Signup and view all the answers

    What is the primary method of preventing rust from forming on metal surfaces?

    <p>By using a protective coating or barrier</p> Signup and view all the answers

    What is the characteristic of zinc oxide that makes it an effective protective layer?

    <p>It is non-reactive and forms a barrier</p> Signup and view all the answers

    Why are materials like wood or aluminum preferred over iron or steel in coastal areas?

    <p>Because they do not rust</p> Signup and view all the answers

    What is the primary reason why rust can be detrimental to metal structures?

    <p>Because it degrades their structural integrity and appearance</p> Signup and view all the answers

    What is the purpose of coatings such as paint or oil?

    <p>To provide a protective barrier against rust</p> Signup and view all the answers

    What is the purpose of using fine steel threads in combustion reactions?

    <p>To increase the surface area of the reaction</p> Signup and view all the answers

    What is the term for the chemical reaction that occurs when a substance reacts with oxygen, releasing energy in the form of light and heat?

    <p>Combustion reaction</p> Signup and view all the answers

    What is the symbolic representation of the reaction of magnesium with oxygen?

    <p>2Mg + O₂ → 2MgO</p> Signup and view all the answers

    What is the product formed when magnesium reacts with oxygen in the air?

    <p>Magnesium oxide (MgO)</p> Signup and view all the answers

    What is the term for the substances formed as a result of a chemical reaction?

    <p>Products</p> Signup and view all the answers

    What is the general word equation for the reaction of metals with oxygen?

    <p>Metal + oxygen → metal oxide</p> Signup and view all the answers

    What is the term for the process of magnesium reacting rapidly with oxygen in the air?

    <p>Combustion</p> Signup and view all the answers

    What is the term for compounds formed when metals react with oxygen?

    <p>Metal oxides</p> Signup and view all the answers

    What is the result of the combustion reaction between iron and oxygen?

    <p>Formation of iron(III) oxide</p> Signup and view all the answers

    Why does the iron in steel wool react with oxygen more easily than a solid iron block?

    <p>Because it has a larger surface area</p> Signup and view all the answers

    What is the role of oxygen in the combustion reaction of iron?

    <p>It reacts with iron to form iron oxide</p> Signup and view all the answers

    What is the energy released during the combustion reaction of iron felt as?

    <p>Light and heat</p> Signup and view all the answers

    What is the purpose of the demonstration of iron reacting with oxygen in air?

    <p>To show the combustion reaction of iron</p> Signup and view all the answers

    What is the type of chemical reaction that occurs when iron reacts with oxygen?

    <p>Combustion</p> Signup and view all the answers

    What is the reactant that is present in the air in the combustion reaction of iron?

    <p>Oxygen</p> Signup and view all the answers

    What is the visual effect observed when iron or steel wool burns?

    <p>A bright orange spark</p> Signup and view all the answers

    What is the characteristic of zinc oxide that makes it an effective protective layer?

    <p>It is non-porous and blocks oxygen and water</p> Signup and view all the answers

    What happens when the zinc coating is scratched?

    <p>A new protective oxide layer forms to protect the iron</p> Signup and view all the answers

    What is the primary reason why rust can be detrimental to metal structures?

    <p>It weakens the metal and can cause it to fail</p> Signup and view all the answers

    What is the effect of salt in the air on the corrosion of iron?

    <p>It accelerates the corrosion process</p> Signup and view all the answers

    What is the purpose of galvanizing iron or steel with a layer of zinc?

    <p>To make the metal more resistant to corrosion</p> Signup and view all the answers

    What is the common application of galvanized products?

    <p>Construction and household items</p> Signup and view all the answers

    In which environment does rusting occur more quickly?

    <p>Moist or corrosive environments</p> Signup and view all the answers

    What is the effect of acids on the corrosion of iron?

    <p>They accelerate the corrosion process</p> Signup and view all the answers

    What is the term used to describe the release of energy in the form of light and heat when a substance reacts with oxygen?

    <p>Combustion</p> Signup and view all the answers

    What is the purpose of using fine steel threads in the demonstration of iron reacting with oxygen?

    <p>To provide a large surface area for the reaction</p> Signup and view all the answers

    What is the reactant in the combustion reaction of iron that is a gas present in the air?

    <p>Oxygen (O₂)</p> Signup and view all the answers

    What is the energy released during the combustion reaction of iron felt as?

    <p>Heat</p> Signup and view all the answers

    What is the role of oxygen in the combustion reaction of iron?

    <p>It is the reactant that combines with iron</p> Signup and view all the answers

    What is the significance of the orange sparks observed when iron or steel wool burns?

    <p>They demonstrate the energy released during the combustion reaction</p> Signup and view all the answers

    What is the type of chemical reaction that occurs when iron reacts with oxygen?

    <p>Combustion</p> Signup and view all the answers

    What is the state of the iron(III) oxide produced in the combustion reaction of iron?

    <p>Solid</p> Signup and view all the answers

    What is the purpose of the zinc oxide layer formed on the surface of zinc?

    <p>To prevent further oxidation of the zinc</p> Signup and view all the answers

    What happens when the zinc coating is scratched?

    <p>The underlying zinc can still protect the iron by forming a new protective oxide layer</p> Signup and view all the answers

    What is the characteristic of zinc oxide that makes it an effective protective layer?

    <p>It is non-porous and effectively blocks oxygen and water</p> Signup and view all the answers

    What is the common application of galvanised products?

    <p>Construction and household items</p> Signup and view all the answers

    What is the effect of salt in the air on the corrosion of iron?

    <p>It accelerates the corrosion process</p> Signup and view all the answers

    What is the effect of acids on the corrosion of iron?

    <p>They accelerate the corrosion process</p> Signup and view all the answers

    In which environment does rusting occur more quickly?

    <p>Humid and coastal environments</p> Signup and view all the answers

    What is the reaction between zinc and oxygen that forms zinc oxide?

    <p>2Zn + O2 → 2ZnO</p> Signup and view all the answers

    What is the main difference between the chemical equation for magnesium reacting with oxygen and the chemical equation for iron reacting with oxygen?

    <p>The type of oxide formed</p> Signup and view all the answers

    What is the purpose of the coefficients in a chemical equation?

    <p>To balance the equation</p> Signup and view all the answers

    What is the general formula for the oxides formed by Group 1 metals reacting with oxygen?

    <p>M₂O</p> Signup and view all the answers

    What is the primary component of rust?

    <p>Iron oxide</p> Signup and view all the answers

    What is the term for the gradual destruction of materials, usually metals, by chemical reaction with their environment?

    <p>Corrosion</p> Signup and view all the answers

    What is the relationship between the presence of moisture and the rusting process?

    <p>Moisture accelerates the rusting process</p> Signup and view all the answers

    What is the symbolic representation of the reaction of iron with oxygen in the presence of water?

    <p>4Fe + 3O₂ + 6H₂O → 4Fe(OH)₃</p> Signup and view all the answers

    What is the general equation for Group 2 metals reacting with oxygen?

    <p>2M + O₂ → 2MO</p> Signup and view all the answers

    What is the main reason why rust forms more quickly in environments with high humidity and salt content?

    <p>Because the saltwater is more corrosive and helps facilitate the electrochemical reactions.</p> Signup and view all the answers

    What is the primary purpose of applying a coating to metal surfaces to prevent rust?

    <p>To provide a protective barrier between the metal and oxygen.</p> Signup and view all the answers

    Why is galvanizing iron or steel with a layer of zinc an effective method of preventing rust?

    <p>Because zinc reacts with oxygen to form a protective layer.</p> Signup and view all the answers

    What is the primary reason why materials like wood or aluminum are preferred over iron or steel in coastal areas?

    <p>Because they do not rust.</p> Signup and view all the answers

    What is the effect of acids on the corrosion of iron?

    <p>They increase the rate of corrosion.</p> Signup and view all the answers

    What is the primary effect of rust on metal structures?

    <p>It degrades their structural integrity and appearance.</p> Signup and view all the answers

    Why is chromium often used to coat metal surfaces?

    <p>Because it forms a protective layer that prevents rust from forming.</p> Signup and view all the answers

    What is the primary method of preventing rust from forming on metal surfaces?

    <p>By applying a protective coating.</p> Signup and view all the answers

    What is the main purpose of using fine steel threads in combustion reactions?

    <p>To increase the surface area for the reaction</p> Signup and view all the answers

    What is the submicroscopic representation of the reactants in the combustion reaction of magnesium?

    <p>Atoms of magnesium and molecules of oxygen</p> Signup and view all the answers

    What is the term for the chemical reaction that occurs when a substance reacts with oxygen, releasing energy in the form of light and heat?

    <p>Combustion</p> Signup and view all the answers

    What is the symbolic representation of the reaction of magnesium with oxygen?

    <p>2Mg + O₂ → 2MgO</p> Signup and view all the answers

    What is the product formed when magnesium reacts with oxygen in the air?

    <p>Magnesium oxide</p> Signup and view all the answers

    What is the general word equation for the reaction of metals with oxygen?

    <p>Metal + oxygen → metal oxide</p> Signup and view all the answers

    What is the term for the device used to produce a brief burst of bright light in photography?

    <p>Flash</p> Signup and view all the answers

    What is the primary reason why the combustion reaction of magnesium is highly exothermic?

    <p>Because it releases a large amount of energy</p> Signup and view all the answers

    What is the primary difference between the chemical equation for magnesium reacting with oxygen and the chemical equation for iron reacting with oxygen?

    <p>The formula of the product</p> Signup and view all the answers

    What is the purpose of using picture equations in chemistry?

    <p>To illustrate the particles involved in a chemical reaction</p> Signup and view all the answers

    What is the general formula for the oxides formed by Group 1 metals?

    <p>M₂O</p> Signup and view all the answers

    What is the term for the substance that forms on iron when it reacts with oxygen in the air?

    <p>Rust</p> Signup and view all the answers

    What is the purpose of coefficients in chemical equations?

    <p>To balance the equation</p> Signup and view all the answers

    What is the term for the chemical reaction between a metal and oxygen?

    <p>Oxidation reaction</p> Signup and view all the answers

    What is the primary difference between iron oxide and rust?

    <p>Iron oxide is not hydrated, while rust is hydrated</p> Signup and view all the answers

    What is the term for the process of preventing rust from forming on metal surfaces?

    <p>Corrosion protection</p> Signup and view all the answers

    What is the primary function of a coating of chromium on iron?

    <p>To form a protective barrier that prevents oxygen from reacting with the iron</p> Signup and view all the answers

    Why are metal structures in coastal areas more prone to rust?

    <p>The high humidity and salt content in the air facilitate electrochemical reactions</p> Signup and view all the answers

    What is the primary advantage of using galvanized metal in construction?

    <p>The zinc coating provides a protective barrier against oxygen</p> Signup and view all the answers

    Why is paint not a foolproof method of preventing rust?

    <p>Paint can be scratched or peel off, exposing the metal underneath</p> Signup and view all the answers

    What is the primary purpose of alloying iron with other elements?

    <p>To create a rust-resistant alloy</p> Signup and view all the answers

    Why are materials like wood or aluminum preferred in coastal areas?

    <p>They do not rust like iron or steel</p> Signup and view all the answers

    What is the primary consequence of rust on metal structures?

    <p>It degrades the structural integrity and appearance of the metal</p> Signup and view all the answers

    What is the primary reason why rust can be aesthetically pleasing in art?

    <p>It is a natural process that occurs over time</p> Signup and view all the answers

    What is the primary reason for using fine steel threads in the combustion reaction of magnesium?

    <p>To increase the surface area of the reaction</p> Signup and view all the answers

    What is the symbolic representation of the reaction of magnesium with oxygen?

    <p>2Mg + O₂ → 2MgO</p> Signup and view all the answers

    What is the term for the process of magnesium reacting rapidly with oxygen in the air?

    <p>Combustion</p> Signup and view all the answers

    What is the product formed when magnesium reacts with oxygen?

    <p>MgO</p> Signup and view all the answers

    What is the general word equation for the reaction of metals with oxygen?

    <p>metal + oxygen → metal oxide</p> Signup and view all the answers

    What is the term for the substances formed as a result of a chemical reaction?

    <p>Products</p> Signup and view all the answers

    What is the term for compounds formed when metals react with oxygen?

    <p>Metal oxides</p> Signup and view all the answers

    What is the energy released during the combustion reaction of magnesium observed as?

    <p>Light and heat</p> Signup and view all the answers

    What is the primary reason for the visible sparks observed during the combustion reaction of iron?

    <p>The reaction occurs rapidly, resulting in a rapid release of energy</p> Signup and view all the answers

    What is the purpose of the demonstration of iron reacting with oxygen using steel wool?

    <p>To illustrate the reaction of iron with oxygen in a controlled environment</p> Signup and view all the answers

    What is the chemical equation for the combustion reaction of iron balanced with respect to?

    <p>The number of iron and oxygen atoms</p> Signup and view all the answers

    What is the term for the substance that is formed when iron reacts with oxygen?

    <p>Iron oxide</p> Signup and view all the answers

    What is the primary factor that affects the rate of the combustion reaction of iron?

    <p>The surface area of the iron</p> Signup and view all the answers

    What is the energy released during the combustion reaction of iron?

    <p>Light and heat only</p> Signup and view all the answers

    What is the characteristic of the combustion reaction of iron that makes it a type of chemical reaction?

    <p>It involves the reaction of a substance with oxygen</p> Signup and view all the answers

    What is the purpose of the combustion reaction of iron in a demonstration?

    <p>To illustrate the concept of combustion</p> Signup and view all the answers

    What is the primary reason why zinc oxide is effective in preventing further oxidation of iron?

    <p>It is a dense, non-porous layer that blocks oxygen and water from reaching the iron.</p> Signup and view all the answers

    What is the primary application of galvanised products in construction?

    <p>Walls and roofing</p> Signup and view all the answers

    What is the effect of salt in the air on the corrosion of iron?

    <p>It accelerates the corrosion process</p> Signup and view all the answers

    What is the primary reason why zinc is used to galvanise iron?

    <p>It reacts with oxygen to form a protective layer</p> Signup and view all the answers

    What is the characteristic of the zinc oxide layer that makes it an effective protective layer?

    <p>It is dense and non-porous, blocking oxygen and water</p> Signup and view all the answers

    What is the effect of acids on the corrosion of iron?

    <p>It accelerates the corrosion process</p> Signup and view all the answers

    What happens when the zinc coating is scratched?

    <p>The underlying zinc reacts with oxygen to form a new protective layer</p> Signup and view all the answers

    What is the common application of galvanised products in gardening?

    <p>Galvanised watering cans</p> Signup and view all the answers

    What is the purpose of the coefficients in a chemical equation?

    <p>To balance the number of atoms on both sides of the equation</p> Signup and view all the answers

    What is the difference between rust and iron oxide?

    <p>Rust is a type of corrosion that occurs in the presence of moisture, while iron oxide can occur in dry environments</p> Signup and view all the answers

    What is the general equation for Group 1 metals reacting with oxygen?

    <p>4M + O₂ → 2M₂O</p> Signup and view all the answers

    What is the term for the substances formed as a result of a chemical reaction?

    <p>Products</p> Signup and view all the answers

    What is the purpose of rust-resistant materials?

    <p>To slow down the rusting process</p> Signup and view all the answers

    What is the term for the gradual destruction of materials by chemical reaction?

    <p>Corrosion</p> Signup and view all the answers

    What is the formula for iron(III) oxide?

    <p>Fe₂O₃</p> Signup and view all the answers

    What is the purpose of picture equations?

    <p>To represent the particles involved in a chemical reaction</p> Signup and view all the answers

    What is the primary purpose of using fine steel threads in combustion reactions?

    <p>To increase the surface area of the reaction</p> Signup and view all the answers

    What is the symbolic representation of the reaction of magnesium with oxygen?

    <p>2Mg + O2 → 2MgO</p> Signup and view all the answers

    What is the term for the process of magnesium reacting rapidly with oxygen in the air?

    <p>Combustion</p> Signup and view all the answers

    What is the general word equation for the reaction of metals with oxygen?

    <p>Metal + Oxygen → Metal Oxide</p> Signup and view all the answers

    What is the term for the substances formed as a result of a chemical reaction?

    <p>Products</p> Signup and view all the answers

    What is the term for compounds formed when metals react with oxygen?

    <p>Metal Oxides</p> Signup and view all the answers

    What is the primary reason for using magnesium in camera flashes?

    <p>To produce a bright flash of light</p> Signup and view all the answers

    What is the characteristic of magnesium oxide that makes it a product of the combustion reaction of magnesium?

    <p>It is a white powdery substance</p> Signup and view all the answers

    What is the primary purpose of the zinc oxide layer formed on the surface of zinc?

    <p>To prevent further oxidation and protect the underlying metal</p> Signup and view all the answers

    What is the characteristic of zinc oxide that makes it an effective protective layer?

    <p>It is non-porous and forms a dense layer</p> Signup and view all the answers

    What happens when the zinc coating is scratched?

    <p>A new protective oxide layer is formed to replace the scratched area</p> Signup and view all the answers

    What is the effect of salt in the air on the corrosion of iron?

    <p>It accelerates the corrosion process</p> Signup and view all the answers

    What is the common application of galvanised products?

    <p>Construction and household items</p> Signup and view all the answers

    What is the effect of acids on the corrosion of iron?

    <p>It accelerates the corrosion process</p> Signup and view all the answers

    What is the chemical equation for the reaction of zinc with oxygen?

    <p>2Zn + O2 → 2ZnO</p> Signup and view all the answers

    In which environment does rusting occur more quickly?

    <p>Moist and corrosive environments</p> Signup and view all the answers

    What is the primary purpose of using fine steel threads in the combustion reaction of iron?

    <p>To increase the surface area of the iron for a faster reaction</p> Signup and view all the answers

    Which of the following is NOT a characteristic of the combustion reaction of iron?

    <p>Decomposition of a substance into two or more products</p> Signup and view all the answers

    What is the primary reason why the combustion reaction of iron is exothermic?

    <p>The formation of iron(III) oxide releases energy</p> Signup and view all the answers

    What is the role of oxygen in the combustion reaction of iron?

    <p>It reacts with iron to form iron(III) oxide</p> Signup and view all the answers

    What is the term for the process of iron reacting with oxygen in the air?

    <p>Combustion</p> Signup and view all the answers

    What is the state of the product formed during the combustion reaction of iron?

    <p>Solid</p> Signup and view all the answers

    Why is the combustion reaction of iron a chemical reaction?

    <p>Because it involves the formation of a new substance</p> Signup and view all the answers

    What is the primary reason why the combustion reaction of iron is visible?

    <p>Because it produces bright orange sparks</p> Signup and view all the answers

    What is the primary reason why acidic environments accelerate rusting?

    <p>Because acids increase the conductance of air, facilitating electrochemical reactions.</p> Signup and view all the answers

    What is the primary advantage of using stainless steel in construction?

    <p>It is more resistant to corrosion.</p> Signup and view all the answers

    What is the primary function of the zinc layer in galvanized metal?

    <p>To provide a sacrificial anode, protecting the underlying metal.</p> Signup and view all the answers

    What is the primary effect of saltwater on the rusting process?

    <p>It speeds up the rusting process by increasing the conductance of water.</p> Signup and view all the answers

    What is the primary reason why chromed metal is resistant to rust?

    <p>Because chromium reacts with oxygen to form a protective layer.</p> Signup and view all the answers

    What is the primary consequence of rusting on metal structures?

    <p>It degrades the structural integrity of the metal.</p> Signup and view all the answers

    What is the primary benefit of using coatings to prevent rust?

    <p>They provide a barrier that prevents oxygen from reaching the metal.</p> Signup and view all the answers

    What is the primary reason why certain materials are preferred over iron or steel in coastal areas?

    <p>Because they are more resistant to corrosion.</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser