Changes in Matter (Chemical and Physical Changes)

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

• Burning wood

• Melting ice

• Rusting iron

• Baking a cake

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DOK Level 2: Skill/Concept

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Which process involves a chemical change?

• Dissolving sugar in water

• Freezing water into ice

• Digesting food

• Cutting paper

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DOK Level 2: Skill/Concept

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A student observes that a piece of metal has rusted. What type of change has occurred?

• Physical change

• Chemical change

• Both physical and chemical change

• Neither physical nor chemical change

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DOK Level 2: Skill/Concept

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Which of the following scenarios best illustrates a physical change?

• A nail rusting

• A candle burning

• Water boiling

• Bread baking

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DOK Level 2: Skill/Concept

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Explain why dissolving salt in water is considered a physical change.

• Because it forms a new substance

• Because it can be reversed by evaporation

• Because it releases energy

• Because it changes the chemical composition of salt

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DOK Level 3: Strategic Thinking

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A student mixes vinegar and baking soda, resulting in bubbling and the formation of a new substance. What type of change is this?

• Physical change

• Chemical change

• Both physical and chemical change

• Neither physical nor chemical change

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DOK Level 3: Strategic Thinking

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

• Change in color

• Formation of a precipitate

• Change in state

• Production of gas

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DOK Level 2: Skill/Concept

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A student observes that a piece of paper burns and turns into ash. What evidence supports that a chemical change has occurred?

• The paper changes color

• The paper changes shape

• The paper produces heat and light

• The paper can be reformed into its original state

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DOK Level 3: Strategic Thinking

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Which of the following best describes the difference between a physical and a chemical change?

• Physical changes alter the chemical composition of a substance, while chemical changes do not.

• Chemical changes are always reversible, while physical changes are not.

• Physical changes do not alter the chemical composition of a substance, while chemical changes do.

• Chemical changes do not involve energy changes, while physical changes do.

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DOK Level 3: Strategic Thinking

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Which of the following is an example of applying knowledge of physical changes?

• Predicting the products of a chemical reaction

• Explaining why ice melts at room temperature

• Describing the process of photosynthesis

• Identifying the reactants in a combustion reaction

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DOK Level 3: Strategic Thinking

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