Unit 4 Test (7th)

Which of the following is a sign of a chemical change?

• Melting ice

• Tearing paper

• Bubbles forming in a liquid

• Dissolving sugar in water

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NGSS.MS-PS1-2

The Law of Conservation of Mass states that:

• Matter can be created during a chemical reaction.

• Matter can be destroyed during a chemical reaction.

• The total mass of reactants equals the total mass of products.

• Heat is always released during a chemical reaction.

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NGSS.MS-PS1-5

What type of heat transfer occurs when a hot pan heats your hand?

• Convection

• Radiation

• Conduction

• Insulation

A color change during a reaction indicates:

• A physical change.

• A change in state.

• The formation of a new substance.

• A change in volume.

Tags

NGSS.MS-PS1-2

Which of the following is an example of radiation?

• Hot air rising

• A hot pan heating a countertop

• The sun warming the earth

• Boiling water

An endothermic reaction:

• Releases heat.

• Absorbs heat.

• Produces light.

• Always produces a gas.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

What happens to atoms during a chemical reaction?

• They disappear.

• They are created.

• They rearrange.

• They change into different atoms.

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NGSS.MS-PS1-5

Formation of a precipitate is:

• A gas forming.

• A liquid changing colors.

• A solid forming in a liquid.

• A temperature change.

Explain how the Law of Conservation of Mass applies to a chemical reaction. Use the example of burning wood to illustrate your explanation.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5