Gr 9 NATURAL SCIENCES: CH 2.3 SUM Reaction of metals with oxygen
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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 (A)</p> Signup and view all the answers

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

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

What is the state of oxygen in the air?

<p>Gas (D)</p> Signup and view all the answers

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

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

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

<p>Heat (A)</p> Signup and view all the answers

What is the product formed when iron reacts with oxygen?

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

What is the formula for magnesium oxide?

<p>MgO (B)</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 (A)</p> Signup and view all the answers

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

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

What is the formula for sodium oxide?

<p>Naâ‚‚O (C)</p> Signup and view all the answers

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

<p>Corrosion (C)</p> Signup and view all the answers

What is the primary component of rust?

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

What factor accelerates the rusting process?

<p>Moisture (A)</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 (A)</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 (C)</p> Signup and view all the answers

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

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

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

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

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

<p>Products (D)</p> Signup and view all the answers

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

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

What accelerates the rusting process in saltwater environments?

<p>High conductivity (B)</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 (A)</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 (C)</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 (A)</p> Signup and view all the answers

How does paint prevent rust from forming on metal surfaces?

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

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

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

Why is chromium often used to coat metal surfaces?

<p>Because it does not react with oxygen (D)</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 (D)</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. (D)</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. (B)</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. (C)</p> Signup and view all the answers

What is the common application of galvanised products?

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

In which environment does rusting occur more quickly?

<p>In moist and corrosive environments. (D)</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. (A)</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. (C)</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. (A)</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. (D)</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. (C)</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. (A)</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. (D)</p> Signup and view all the answers

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

<p>They accelerate the corrosion process. (C)</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 (A)</p> Signup and view all the answers

What is the primary component of steel?

<p>Iron (B)</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 (C)</p> Signup and view all the answers

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

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

What is the state of iron in the reactants?

<p>Solid (B)</p> Signup and view all the answers

What is the product formed when iron reacts with oxygen?

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

What is the energy released during the combustion reaction?

<p>Light and heat (D)</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 (C)</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 (A)</p> Signup and view all the answers

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

<p>Reactants (A)</p> Signup and view all the answers

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

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

What is the symbolic representation of a chemical reaction?

<p>Chemical equation (A)</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 (B)</p> Signup and view all the answers

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

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

What is the purpose of safety precautions during combustion reactions?

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

What is observed when magnesium ignites?

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

What is formed when zinc reacts with oxygen?

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

What is the common application of galvanised products?

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

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

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

In which environment does rusting occur more quickly?

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

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

<p>Mâ‚‚O (A)</p> Signup and view all the answers

What is the purpose of coefficients in chemical equations?

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

What is the product formed when magnesium reacts with oxygen?

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

What is rust primarily composed of?

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

What factor accelerates the rusting process?

<p>Moisture (C)</p> Signup and view all the answers

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

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

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

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

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

<p>M2O (D)</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 (C)</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 (B)</p> Signup and view all the answers

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

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

What accelerates the rusting process?

<p>Moisture (C)</p> Signup and view all the answers

What is the product formed when magnesium reacts with oxygen?

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

What is the chemical equation for the formation of rust?

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

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

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

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

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

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

<p>Products (B)</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 (B)</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 (D)</p> Signup and view all the answers

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

<p>Metal oxides (B)</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 (B)</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 (A)</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 (C)</p> Signup and view all the answers

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

<p>Light and heat (B)</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 (A)</p> Signup and view all the answers

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

<p>Combustion (D)</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 (A)</p> Signup and view all the answers

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

<p>A bright orange spark (C)</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 (B)</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 (B)</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 (C)</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 (D)</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 (B)</p> Signup and view all the answers

What is the common application of galvanized products?

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

In which environment does rusting occur more quickly?

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

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

<p>They accelerate the corrosion process (D)</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 (D)</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 (A)</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 (Oâ‚‚) (D)</p> Signup and view all the answers

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

<p>Heat (A)</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 (D)</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 (A)</p> Signup and view all the answers

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

<p>Combustion (D)</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 (D)</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 (C)</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 (C)</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 (A)</p> Signup and view all the answers

What is the common application of galvanised products?

<p>Construction and household items (D)</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 (A)</p> Signup and view all the answers

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

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

In which environment does rusting occur more quickly?

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

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

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

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

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

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

<p>Mâ‚‚O (D)</p> Signup and view all the answers

What is the primary component of rust?

<p>Iron oxide (B)</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 (C)</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 (D)</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 (C)</p> Signup and view all the answers

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

<p>2M + O₂ → 2MO (D)</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. (A)</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. (A)</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. (A)</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. (A)</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. (C)</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. (C)</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. (D)</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. (D)</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 (B)</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 (A)</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 (A)</p> Signup and view all the answers

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

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

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

<p>Magnesium oxide (D)</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 (A)</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 (B)</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 (B)</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 (B)</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 (A)</p> Signup and view all the answers

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

<p>Mâ‚‚O (C)</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 (C)</p> Signup and view all the answers

What is the purpose of coefficients in chemical equations?

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

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

<p>Oxidation reaction (B)</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 (C)</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 (C)</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 (C)</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 (B)</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 (C)</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 (A)</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 (B)</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 (D)</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 (D)</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 (D)</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 (C)</p> Signup and view all the answers

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

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

What is the product formed when magnesium reacts with oxygen?

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

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

<p>Products (A)</p> Signup and view all the answers

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

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

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

<p>Light and heat (B)</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 (B)</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 (B)</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 (A)</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 (D)</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 (D)</p> Signup and view all the answers

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

<p>Light and heat only (C)</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 (D)</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 (D)</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. (B)</p> Signup and view all the answers

What is the primary application of galvanised products in construction?

<p>Walls and roofing (B)</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 (D)</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 (B)</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 (D)</p> Signup and view all the answers

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

<p>It accelerates the corrosion process (C)</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 (A)</p> Signup and view all the answers

What is the common application of galvanised products in gardening?

<p>Galvanised watering cans (B)</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 (B)</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 (C)</p> Signup and view all the answers

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

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

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

<p>Products (D)</p> Signup and view all the answers

What is the purpose of rust-resistant materials?

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

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

<p>Corrosion (B)</p> Signup and view all the answers

What is the formula for iron(III) oxide?

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

What is the purpose of picture equations?

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

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

<p>2Mg + O2 → 2MgO (B)</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 (C)</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 (D)</p> Signup and view all the answers

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

<p>Products (C)</p> Signup and view all the answers

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

<p>Metal Oxides (D)</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 (D)</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 (A)</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 (A)</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 (A)</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 (C)</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 (D)</p> Signup and view all the answers

What is the common application of galvanised products?

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

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

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

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

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

In which environment does rusting occur more quickly?

<p>Moist and corrosive environments (C)</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 (D)</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 (D)</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 (D)</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 (B)</p> Signup and view all the answers

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

<p>Combustion (C)</p> Signup and view all the answers

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

<p>Solid (C)</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 (B)</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 (A)</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. (D)</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. (D)</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. (B)</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. (D)</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. (B)</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. (C)</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. (B)</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. (C)</p> Signup and view all the answers

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