Topic 1.3 HW: Chemical Change vs. Physical Change

What is the main difference between a physical reaction and a chemical reaction?

• The main difference is composition. In a chemical reaction, the composition of the substances changes, while in a physical change, the appearance, smell, or display changes without a change in composition.

• A physical reaction always produces light, while a chemical reaction does not.

• A chemical reaction only changes the temperature, while a physical reaction changes the color.

• A physical reaction creates new substances, while a chemical reaction does not.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT a common physical change?

• Texture

• Color

• Change in composition

• Shape

Which of the following are physical properties?

• Luster

• Malleability

• Density

• All of the above

Any change in physical properties is referred to as a ________ change.

• physical

• chemical

• nuclear

• biological

Which of the following is an indicator of a chemical change?

• Change in temperature

• Change in color

• Formation of bubbles

• All of the above

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NGSS.MS-PS1-2

A change in color is always a chemical change.

• True

• False

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NGSS.MS-PS1-2

What happens to the composition of a substance during a chemical change?

• The composition of the substance changes.

• The composition of the substance remains the same.

• The substance only changes its shape.

• The substance only changes its temperature.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is an example of a physical change in texture?

• If a piece of wood was sanded, waxed, and polished, it would have a very different texture than it initially had as a rough piece of wood.

• If a piece of wood was burned and turned to ash, it would have a different texture.

• If a piece of wood was dissolved in acid, it would have a different texture.

• If a piece of wood was painted, it would have a different texture due to the color change.

Which of the following is NOT a physical property?

• Mass

• Volume

• Formation of a precipitate

• Solubility

No reaction is actually occurring in a physical change.

• True

• False

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NGSS.MS-PS1-2