TEST: Changes in Matter

(a)   is an example of a physical change.

• Burning wood
• Melting ice
• Rusting iron
• Baking a cake

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DOK Level 1: Recall

TEKS.SCI.7.6C

The main difference between a physical change and a chemical change is that (a)   .

• Physical changes create new substan
• Chemical changes create new substan
• Physical changes involve energy, wh
• Chemical changes are reversible, wh

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DOK Level 1: Recall

TEKS.SCI.7.6C

Which of the following scenarios best illustrates a chemical change?

• Dissolving sugar in water

• Cutting a piece of paper

• Iron rusting over time

• Boiling water

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DOK Level 1: Recall

TEKS.SCI.7.6C

Identify the cause and effect relationship in the following scenario: When vinegar is added to baking soda, bubbles form.

• The effect is the formation of bubbles; the cause is the addition of vinegar to baking soda.

• The effect is the addition of vinegar; the cause is the formation of bubbles.

• The effect is the vinegar; the cause is the baking soda.

• The effect is the baking soda; the cause is the vinegar.

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DOK Level 2: Skill/Concept

TEKS.SCI.7.5B

Which of the following is a characteristic of a physical change?

• Formation of a new substance

• Unexpected change in color

• Change in state of matter

• Production of gas

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DOK Level 1: Recall

TEKS.SCI.7.6C

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

• Because it produces a new substance

• Because it changes the chemical composition of salt

• Because it can be reversed by evaporating the water

• Because it releases energy

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DOK Level 2: Skill/Concept

TEKS.SCI.7.6C

(a)   is an example of a chemical change.

• Freezing water
• Tearing paper
• Burning a candle
• Mixing sand and salt

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DOK Level 1: Recall

TEKS.SCI.7.6C

A student observes that a piece of metal has rusted. What evidence supports that a chemical change has occurred?

• The metal has changed shape.

• The metal has changed color and formed a new substance.

• The metal has melted.

• The metal has broken into pieces.

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DOK Level 2: Skill/Concept

TEKS.SCI.7.6C

In an experiment, a student mixes two clear liquids and observes the formation of a solid. What type of change is this, and what evidence supports this conclusion?

• Physical change; the formation of a solid

• Chemical change; the formation of a solid

• Physical change; the liquids remain clear

• Chemical change; the liquids remain clear

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DOK Level 3: Strategic Thinking

TEKS.SCI.7.6C

Which of the following best describes a cause-and-effect relationship in a chemical reaction? Select TWO.

• The effect is the change in temperature; the cause is the mixing of two substances.

• The effect is the mixing of two substances; the cause is the change in temperature.

• The effect is the unexpected color change; the cause is the physical mixing of substances.

• The effect is the physical mixing of substances; the cause is the color change.

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NGSS.MS-PS1-2