Chemical vs Physical Changes Quiz
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Questions and Answers

Which of the following is an example of a chemical change?

  • Melting ice
  • Burning wood (correct)
  • Crushing a can
  • Dissolving sugar in water

    • Physical changes always involve the formation of new substances.

    True

    What is oxidation?

    A chemical reaction involving oxygen that forms a new product.

    The process of a fuel reacting with oxygen to produce heat and light is known as __________.

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

    Match the following processes with their corresponding type of change:

    <p>Melting ice = Physical change Rusting of iron = Chemical change Cooking an egg = Chemical change Crushing a can = Physical change</p> Signup and view all the answers

    Which of the following is an example of a physical change?

    <p>Melting ice</p> Signup and view all the answers

    Combustion reactions do not require oxygen to take place.

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

    What is the difference between physical and chemical properties?

    <p>Physical properties can be observed without changing the substance, while chemical properties describe a substance's ability to undergo chemical reactions.</p> Signup and view all the answers

    The process where food is _______ can be categorized as a physical change.

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

    Match the following properties with their corresponding examples:

    <p>Melting Point = Ice to water Flammability = Burning of gasoline Solubility = Salt dissolving in water Tendency to Rust = Iron exposed to moisture</p> Signup and view all the answers

    What happens during a combustion reaction?

    <p>A fuel reacts with oxygen, producing heat and light energy.</p> Signup and view all the answers

    Rusting is an example of reduction.

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

    What are the three components needed for combustion according to the combustion triangle?

    <p>Air/Oxygen, Fuel, Heat</p> Signup and view all the answers

    Fuel + oxygen → __________ + __________.

    <p>carbon dioxide, water</p> Signup and view all the answers

    Match the following elements with their role in combustion:

    <p>Hydrogen = Combines with oxygen to form water Carbon = Combines with oxygen to form carbon dioxide Oxygen = Supports the combustion process Heat = Initiates the combustion reaction</p> Signup and view all the answers

    Which of the following methods is NOT used to prevent corrosion of metals?

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

    Tarnishing is a method used to prevent corrosion in metals.

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

    What is rust?

    <p>Rust is the oxide formed when iron reacts with moisture and oxygen.</p> Signup and view all the answers

    Matter is anything that has ______ and volume.

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

    Match the physical properties of matter with their definitions:

    <p>Color = The visual perception of an object Melting Point = The temperature at which a solid becomes a liquid Solubility = The ability of a substance to dissolve in another substance Magnetic Response = The tendency of a material to attract or repel magnets</p> Signup and view all the answers

    Which material is a good conductor of heat?

    <p>Cooking Pot</p> Signup and view all the answers

    Plastic cups are suitable for containing acetone.

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

    What is the chemical formula for Agricultural Lime?

    <p>CaCO3</p> Signup and view all the answers

    Metals have high melting and boiling points, making them suitable for use in __________.

    <p>car engines</p> Signup and view all the answers

    Match the properties with their respective examples:

    <p>Flammability = Describes how a substance burns Acidity = Describes the pH level of a substance Electrical Conductivity = Ability to conduct electricity Solubility = Ability of a substance to dissolve in a solvent</p> Signup and view all the answers

    What compound is formed when iron rusts?

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

    Tarnishing affects metals by causing them to become shiny.

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

    What are the two essential components needed for rust to form?

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

    The process of coating metals with a protective layer is known as ______.

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

    Match the following metal properties to their effects:

    <p>Rusting = Reddish-brown compound formation Tarnishing = Loss of shiny surface Electroplating = Protective coating Corrosion = Chemical attack on metal surface</p> Signup and view all the answers

    Which of the following metals tarnishes easily?

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

    The reaction of metals with air or moisture is called corrosion.

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

    What is the primary reason why painted metal does not rust?

    <p>The paint acts as a barrier to oxygen and moisture.</p> Signup and view all the answers

    Which of the following is an example of a chemical property?

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

    Physical properties can be observed without changing the substance.

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

    What is matter made of?

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

    Agricultural lime, which is made from __________, is used to increase soil pH.

    <p>calcium carbonate</p> Signup and view all the answers

    Match the following substances with their associated properties:

    <p>Natural Gas = Highly flammable Plastic = Not suitable for acetone Chromium coating = Resists corrosion Metals = High melting and boiling points</p> Signup and view all the answers

    Which gas is a significant contributor to acid rain?

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

    The greenhouse effect is caused by ozone trapping the Sun's heat.

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

    What is the primary effect of acid rain on the environment?

    <p>It damages natural resources, including stonework and vegetation.</p> Signup and view all the answers

    The main components of hydrocarbons are __________ and __________.

    <p>carbon, hydrogen</p> Signup and view all the answers

    Match the greenhouse gases with their primary sources:

    <p>Carbon Dioxide = Burning fossil fuels Methane = Cattle waste Nitrous Oxide = Agricultural fertilizers Fluorinated gases = Industrial processes</p> Signup and view all the answers

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