Physical and Chemical Changes Practice

When coffee is poured into a cup of ice, the ice begins to melt and mix with the coffee. Which statement best describes this change?

• The ice melting is a chemical change because the water changes form.
• The ice melting is a physical change because the water may be frozen again.
• The water and coffee mixing is a chemical change because the liquids change color.
• The water and coffee mixing is a physical change because the mixture forms bubbles.

Which statement best describes why baking a cake is an example of a chemical change?

• The process takes place in an oven.
• The process requires heat energy.
• The process cannot be reversed.
• The process can be repeated.

Stanley left an ice cube on his kitchen counter. An hour later, Stanley observed that the ice cube melted. Which statement best describes this change?

• Ice melting is a physical change because a new substance is created.
• Ice melting is a chemical change because a new substance is created.
• Ice melting is a chemical change because it may be reversed.
• Ice melting is a physical change because it may be reversed.

Which of the following is NOT an example of a physical change?

• crumpled paper
• pencil sharpening
• shrunken clothing
• sour milk

When lithium metal is dropped into a container of water, the lithium sparks and fizzes and the water begins to bubble violently. The conclusion that can be drawn from that is:

• A new substance is created because this is a chemical change.

• No new substances are created because there is a chemical change.

• No new substances are created because this is a physical change.

• A new substance is created because this is a physical change.

A white crystalline powder is mixed with water. No temperature change is observed but the solid disappears. This must be a __________ change.

• Chemical

• Mechanical

• Physical

• Electrical

When two liquids are mixed and a solid is formed, the new solid is called a ________________.

• Levitate

• Precipitate

• Palpitate

• Bad date

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

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

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