PS 5.1 Heating and Cooling/Chemical and Physical Changes

Which of the following best describes what happens to the weight of an object after it is broken into smaller pieces?

• The weight increases.

• The weight decreases.

• The weight remains the same.

• The weight becomes zero.

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When sugar is dissolved in water, what happens to the weight of the water and sugar mixture compared to the weight of the water and sugar separately?

• The weight of the mixture is less than the sum of the separate weights.

• The weight of the mixture is more than the sum of the separate weights.

• The weight of the mixture is equal to the sum of the separate weights.

• The weight of the mixture is zero.

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Which of the following is an example of a new substance being formed when two substances are mixed?

• Mixing sand and water.

• Mixing vinegar and baking soda.

• Mixing salt and pepper.

• Mixing oil and water.

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What happens to the weight of a candle after it has burned completely?

• The weight increases.

• The weight decreases.

• The weight remains the same.

• The weight becomes zero.

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

• Burning wood.

• Rusting iron.

• Melting ice.

• Baking a cake.

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What is the effect of heating on the state of matter of ice?

• It turns into gas.

• It turns into liquid.

• It remains solid.

• It turns into plasma.

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Which of the following is a result of cooling a liquid?

• It turns into gas.

• It turns into solid.

• It remains liquid.

• It turns into plasma.

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When two substances are mixed and a gas is produced, what does this indicate?

• A physical change has occurred.

• A chemical change has occurred.

• No change has occurred.

• The substances have dissolved.

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Which of the following materials is most likely to change its properties when heated?

• Metal.

• Plastic.

• Wood.

• Glass.

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What happens to the weight of a sealed container of gas when it is heated?

• The weight increases.

• The weight decreases.

• The weight remains the same.

• The weight becomes zero.

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