Physical and Chemical Changes Quiz
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Questions and Answers

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

  • Burning of paper
  • Respiration
  • Ripening of fruit
  • Melting of candle wax (correct)

    • In a chemical change, a new substance with different properties is formed.

    True

    What happens when zinc oxide is heated strongly?

    It changes color from white to yellow.

    In a __________ change, no new substance is formed.

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

    Match the following changes with their type:

    <p>Dissolving salt in water = Physical change Burning of paper = Chemical change Melting of ice = Physical change Ripening of fruit = Chemical change</p> Signup and view all the answers

    Which of the following processes is classified as a chemical change?

    <p>Burning of wood</p> Signup and view all the answers

    When common salt dissolves in water, it results in a new substance.

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

    What happens to the properties of substances during a chemical change?

    <p>The properties change completely.</p> Signup and view all the answers

    What type of change occurs when a magnesium ribbon is burned?

    <p>Permanent change with new product</p> Signup and view all the answers

    The change in appearance of a wire when heated in a flame is permanent.

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

    What do iron filings indicate when they stick to a wire rubbed with a magnet?

    <p>The wire has become magnetized.</p> Signup and view all the answers

    The burning of a candle leads to the formation of _______ gas and water vapor.

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

    Match the following experiments with their outcomes:

    <p>Heating magnesium = Permanent change producing magnesium oxide Candle burning = Permanent change producing carbon dioxide and water vapor Magnetizing iron wire = Temporary change losing magnetism upon impact Heating wire = Temporary change regaining original color when cooled</p> Signup and view all the answers

    Which of the following describes a temporary change?

    <p>A wire becoming red hot</p> Signup and view all the answers

    A change that produces a new product is always temporary.

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

    What happens to the iron wire’s magnetic property after being struck against the table?

    <p>It loses its magnetic property.</p> Signup and view all the answers

    What change occurs when mercuric oxide is heated?

    <p>It decomposes into mercury and oxygen</p> Signup and view all the answers

    During a physical change, new substances are formed.

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

    What is the final residue left in the test tube after heating sugar?

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

    Meronic oxide decomposes on heating to form __________ and __________.

    <p>mercury, oxygen</p> Signup and view all the answers

    What happens to a glowing splint when placed in the test tube after heating mercuric oxide?

    <p>It bursts into flame</p> Signup and view all the answers

    Heating sugar is a temporary change that can be reversed.

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

    Name two characteristics of physical changes.

    <p>No new substance is formed; the change can be reversed.</p> Signup and view all the answers

    Which of the following statements about physical changes is true?

    <p>Physical changes can generally be reversed.</p> Signup and view all the answers

    The evaporation of water signifies a chemical change.

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

    What happens to the color of zinc oxide when it is heated?

    <p>It changes to yellow.</p> Signup and view all the answers

    20 g of solid ice will form _____ g of water upon melting.

    <p>20</p> Signup and view all the answers

    Liquid wax cannot change back into solid wax.

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

    What is left behind when water evaporates from a common salt solution?

    <p>Common salt.</p> Signup and view all the answers

    Match the following physical changes with their examples:

    <p>Melting = Changing of ice to water Condensation = Formation of mist or fog Expansion = Heating metals Magnetisation = Stroking iron with a magnet</p> Signup and view all the answers

    Which of the following is NOT a characteristic of a chemical change?

    <p>Change can be easily reversed</p> Signup and view all the answers

    A chemical change results in the formation of a substance that retains the same properties as the original substance.

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

    What is a common example of a chemical change that occurs during cooking?

    <p>Cooking of food</p> Signup and view all the answers

    During the burning of magnesium, a white ash known as ________ is formed.

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

    Match the following examples with their corresponding chemical changes:

    <p>Digestion of food = Chemical change in the body Rusting of iron = Oxidation process Fermentation of sugar = Conversion to alcohol Curdling of milk = Formation of curd</p> Signup and view all the answers

    Which of the following processes absorbs a large amount of heat energy?

    <p>Decomposition of mercuric oxide</p> Signup and view all the answers

    The weight of magnesium oxide formed during the burning of magnesium is less than that of the original magnesium metal.

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

    Name two everyday examples of chemical changes that involve food.

    <p>Ripening of fruit, fermentation of sugar solution</p> Signup and view all the answers

    What change occurs when solid turns into liquid?

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

    A chemical change results in the production of new substances.

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

    What is the boiling point of water in degrees Celsius?

    <p>100</p> Signup and view all the answers

    The process of changing a liquid into a gas is termed __________.

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

    Match the following types of changes with their characteristics:

    <p>Physical Change = No new substance is produced and is temporary Chemical Change = New substances are formed and it is permanent Melting = Solid to liquid transformation Boiling = Liquid to gas transformation</p> Signup and view all the answers

    Which of the following properties does not change during a physical change?

    <p>Specific chemical properties</p> Signup and view all the answers

    A solid's particles can move freely in their positions.

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

    The temperature at which a solid changes into liquid is called the __________.

    <p>melting point</p> Signup and view all the answers

    Study Notes

    Learning Outcomes

    • Children will differentiate between physical and chemical changes.
    • Perform activities related to physical and chemical changes.
    • Classify changes like respiration, food preparation, burning of paper, fruit ripening and spoiled food as physical or chemical changes.
    • Discuss how a chemical change creates a new substance with different properties.

    Introduction

    • All substances around us change.
    • Some changes are small and hard to detect.
    • Some changes are very obvious.
    • Heating substances tends to speed up these changes.
    • Changes can be grouped into physical and chemical.

    Experiments to Examine Changes

    • Experiment 1: Candle wax is heated in a test tube.

      • It melts to a liquid when heated.
      • It hardens again when cooled.
      • No new substance was formed.

    • Experiment 2: Zinc oxide.

      • It turns yellow when heated.
      • Turns back to white when cooled.
      • This colour change is temporary.

    • Experiment 3: Salt in water.

      • Common salt dissolves.
      • The water evaporates leaving the salt behind.
      • No new substance formed, just a temporary change.

    • Experiment 4: Platinum wire.

      • Becomes red hot when heated.
      • Returns to its original color when cooled.
      • A temporary change.

    • Experiment 5: Bicycle spoke and iron filings.

      • The spoke is rubbed against a magnet, making it magnetic.
      • Iron filings are attracted to the spoke.
      • Turning the spoke into a magnet is a temporary change.

    • Experiment 6 (example): Burning of Magnesium.

      • Intense white flame and heat are produced.
      • A new substance called magnesium oxide is created.
      • A permanent change in composition.

    • Experiment 7 (example): Candle flame.

      • Burning creates heat, light, and new compounds (carbon dioxide and water).
      • The candle cannot return to its original state.
      • A permanent change in composition.

    • Experiment 8: Mercuric oxide.

      • Heating creates mercury and oxygen.
      • The change is permanent and irreversible.

    • Experiment 9: Heating sugar.

      • The sugar melts, then turns brown, creating steam.
      • The residue is black and is a new substance.
      • The experiment demonstrates a chemical reaction.

    Physical Changes

    • Generally temporary.
    • No new substance is formed.
    • Properties of material do not fundamentally change.
    • Can be reversed, such as ice reverting to water.

    Chemical Changes

    • Generally permanent.
    • A new substance with different properties is formed.
    • Cannot easily be reversed like burning of paper.
    • Energy is either absorbed or released.

    Types of Changes Involving Energy

    • Endothermic changes: Absorb energy (e.g., melting ice).
    • Exothermic changes: Release energy (e.g., burning wood).

    Changes in State of Matter

    • Melting: A solid changes to a liquid (e.g., ice melting to water).
    • Boiling: A liquid changes to a gas (e.g., water boiling to steam).
    • Condensation: A gas changes to a liquid (e.g., steam condensing to water).

    Dissolution of Substances in Water

    • Endothermic dissolution: Absorbs energy from the water, making the solution feel colder (e.g., ammonium chloride).
    • Exothermic dissolution: Releases energy into the water causing the solution to feel warmer (e.g., calcium oxide).

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    Related Documents

    Physical and Chemical Changes PDF

    Description

    Test your understanding of physical and chemical changes with this quiz. Identify examples, outcomes of experiments, and concepts related to the properties of substances during these changes. It’s a comprehensive assessment for students learning about matter transformations.

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