GA: S8P1.D : Chemical vs Physical Changes

Grace observed a bicycle left outside in the rain for several weeks. Which of the following is an example of a chemical change she might notice?

• Melting of ice

• Rusting of iron

• Boiling of water

• Breaking a glass

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DOK Level 1: Recall

Michael conducted an experiment and noticed a key indicator that a chemical change has occurred. What did he observe?

• Change in shape

• Change in color

• Change in size

• Change in state

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DOK Level 1: Recall

Abigail is conducting an experiment. Which of the following processes involves a physical change?

• Burning wood

• Dissolving sugar in water

• Baking a cake

• Digesting food

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DOK Level 1: Recall

Paul observed ice melting in her drink on a warm day. Explain why the melting of ice is considered a physical change.

• It involves a change in temperature.

• It involves a change in state but not in chemical change.

• It involves a change in color.

• It involves a change in density.

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DOK Level 2: Skill/Concept

Which of the following observations would best support the claim that a chemical change has occurred?

• The substance has changed from a solid to a liquid.

• The substance has released a gas and formed a new substance.

• The substance has changed shape.

• The substance has been mixed with another but remains unchanged.

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DOK Level 2: Skill/Concept

A student observes that a substance changes color and releases heat when mixed with another substance. What type of change is most likely occurring?

• Physical change

• Chemical change

• Both physical and chemical change

• No change

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DOK Level 2: Skill/Concept

Construct an argument to explain why the rusting of iron is a chemical change.

• Rusting involves a change in the physical state of iron.

• Rusting involves the formation of a new substance with different properties.

• Rusting involves a change in the size of the iron object.

• Rusting involves a change in the temperature of the environment.

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DOK Level 3: Strategic Thinking

Analyze the energy changes that occur during a chemical reaction. Which statement is true?

• Energy is always absorbed in a chemical reaction.

• Energy is always released in a chemical reaction.

• Energy can be either absorbed or released in a chemical reaction.

• Energy does not change in a chemical reaction.

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DOK Level 3: Strategic Thinking

Which of the following is an example of a physical change that involves energy change?

• Freezing water to form ice

• Burning a candle

• Cooking an egg

• Rusting of a nail

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DOK Level 1: Recall

Evaluate the following scenario: A student mixes two clear liquids, and the mixture becomes cloudy and warm. What type of change is most likely occurring, and why?

• Physical change, because the temperature increased.

• Chemical change, because a new substance formed and energy was released.

• Physical change, because the liquids mixed.

• Chemical change, because the liquids remained clear.

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DOK Level 3: Strategic Thinking