Physical and Chemical Changes Flashcards
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Questions and Answers

What type of change is baking a cake?

  • Physical Change
  • Neither
  • Both
  • Chemical Change (correct)
  • What type of change is rusting of iron?

  • Chemical Change (correct)
  • Neither
  • Physical Change
  • Both
  • What type of change is digesting food?

  • Physical Change
  • Both
  • Neither
  • Chemical Change (correct)
  • What type of change occurs when milk sours?

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

    Fireworks are an example of which type of change?

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

    What is a chemical change?

    <p>Chemical changes occur when a substance combines with another to form a new substance.</p> Signup and view all the answers

    What type of change is melting an ice cube?

    <p>Physical Change</p> Signup and view all the answers

    What type of change is shredding paper?

    <p>Physical Change</p> Signup and view all the answers

    What type of change occurs when mixing sand with water?

    <p>Physical Change</p> Signup and view all the answers

    What type of change is cutting hair?

    <p>Physical Change</p> Signup and view all the answers

    What type of change is melting butter?

    <p>Physical Change</p> Signup and view all the answers

    What is a physical change?

    <p>A change in a substance that does not involve a change in the identity of the substance.</p> Signup and view all the answers

    Study Notes

    Chemical Changes

    • Baking a cake: Involves a chemical reaction where baking powder produces gas bubbles, resulting in a light and fluffy texture; ingredients can't be separated after baking.
    • Rusting of iron: A chemical reaction between iron and moisture in the air leads to rust formation, altering the iron's state permanently.
    • Digesting food: Enzymes in the stomach and intestines break down large macromolecules into simpler molecules, making nutrients easier to absorb; this is considered a chemical change.
    • Souring milk: Increased acidity and denaturation of proteins occur, changing the chemical composition of milk.
    • Fireworks: The explosion produces sound, heat, light, and odor, all indicative of a chemical change as new substances are created.
    • Definition of chemical change: Occurs when substances combine to form new substances, changing their chemical composition.

    Physical Changes

    • Melting an ice cube: A physical change where energy is added to ice (H2O), transforming it into liquid water without altering its chemical identity.
    • Shredding paper: A physical change that modifies the appearance of paper without changing its composition.
    • Mixing sand with water: Maintains the individual properties of both sand and water; no chemical identity change occurs.
    • Cutting hair: Represents a physical change where the hair's size is altered, but its chemical structure remains unchanged.
    • Melting butter: While it undergoes a physical change, it can change from solid to liquid and back again, indicating an arrangement of atoms but overall identity remains the same.
    • Definition of physical change: Involves alterations to a substance's appearance or state without affecting its identity or chemical composition.

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    Description

    Explore various examples of physical and chemical changes through this interactive flashcard quiz. Each card presents a unique change, like baking a cake or rusting of iron, along with a brief definition. Test your understanding of these fundamental concepts with real-life examples.

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