Unit 4 Quiz (Chemical & Physical Change, Chemical reactions, Law of Conservation of Mass)

1. Which of the following always results from a chemical reaction?

• A. Fire
• B. Bubbles
• C. A new substance that is a solid
• D. A new substance that can be a solid, liquid, or gas

2. Crumpling, then ripping paper is an example of a ___________.

• A. Chemical Change
• B. Chemical Reaction
• C. Physical Change
• D. Nothing, it's just paper

3. Which of the following shows a balanced chemical equation (the same number of atoms on each side)?

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4. Which of the following is a physical change?

• A. Burning Wood
• B. Baking Cake
• C. Rusty Nails
• D. Boiling Water

5. Which of the following is not an example of a physical change?

• A. Ice melting
• B. Cutting Grass
• C. Paper Tearing
• D. Egg frying

6. When a candle is lit, the wick burns, the wax melts, the candle changes shape, and the air around the candle heats up. Which of the following is an example of a chemical change?

• A. the wick burning
• B. the wax melting
• C. the candle changing shape
• D. the air around the candle heating up

7. Which of the following describes an example of a material undergoing a chemical change to become another material with different characteristics?

• A. Iron turns to rust when it is exposed to oxygen
• B. When water boils, it turns into vapor, which is a gas
• C. Oxygen can become liquid at a very low temperature
• D. Gold can be spread out very thin to cover a large area

8. Which answer describes a way that a liquid can be turned into a gas?

• A. Apply enough heat to cause evaporation
• B. Apply freezing temperatures to cause condensation
• C. Lower the temperature of the container to allow vaporization
• D. Maintain a constant temperature over a long enough time to cause freezing

9. Pablo notices that ice cream melts when left out at room temperature. What is Pablo observing?

• A.A physical change
• B. A chemical change
• C. A chemical reaction
• D. The formation of a new substance

10. Which process represents a chemical change?

• A. A lake freezes over into ice
• B. Vinegar bubbles when baking soda is added
• C. A metal bar is rolled into a flat sheet
• D. Sand, water, and salt combine to form a mixture