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PHYSICAL AND CHEMICAL CHANGES

PHYSICAL AND CHEMICAL CHANGES

Assessment

Presentation

Science

6th - 8th Grade

Practice Problem

Medium

NGSS
MS-PS1-2, MS-PS1-4, MS-PS1-5

+2

Standards-aligned

Used 87+ times

FREE Resource

10 Slides • 16 Questions

1

Physical and chemical changes

by: C. McClammey

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Poll

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How would you rate your understanding of Physical and Chemical Changes?

I know everything!

I know a little about the topic.

I don't know anything.

3

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4

Multiple Choice

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Select the answer that is NOT a physical change.

1

baking bread

2

ripping paper

3

painting a picture

4

mixing coffee

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Multiple Choice

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Mixing peas and carrots for dinner.

1

Chemical Change

2

Physical Change

3

Neither Physical nor Chemical

4

Both Physical and Chemical

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Multiple Select

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Select ALL Chemical Change examples.

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Melting ice

2

Burning wood

3

Smashing a pumpkin

4

Digesting food

5

Plants going through photosynthesis.

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Multiple Select

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Select ALL examples of Physical Changes.

1

cutting a sheet of paper

2

burning propane

3

melting ice cream

4

digesting French fries

5

boiling water

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​Physical Changes

The difference between a physical change and a chemical change is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.

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​Examples of Physical Changes

  • Physical changes are limited to changes that result in a difference in display without changing the composition. Some common changes (but not limited to) are:

    • ​Texture

    • ​Color

    • ​Temperature

    • ​​Shape

    • ​​Change of State (freezing, melting)

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Open Ended

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What is a physical change?

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Chemical Change

  • In a chemical change, there is a change in the composition of the substances in question.

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Fill in the Blank

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What is a chemical change?

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​Signs of a Chemical Change

  • Change in Temperature

  • Change in Color

  • ​Noticeable Odor

  • ​Formation of a Precipitate

  • ​Formation of Bubbles

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15

Multiple Choice

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Is "boiling an egg" a Physical Change or a Chemical Change?

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Physical Change

2

Chemical Change

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Multiple Choice

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Burning a candle ______________ change.

1

physical

2

chemical

3

internal

4

external

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Fill in the Blank

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What is the difference between a physical change and a chemical change?

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​Change in Temperature

  • A change in temperature is characteristic of a chemical change. During an experiment, one could dip a thermometer into a beaker or Erlenmeyer Flask to verify a temperature change. If temperature increases, as it does in most reactions, a chemical change is likely to be occurring. This is different from the physical temperature change.

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Multiple Choice

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Exploding Fireworks

1

Physical Change

2

Chemical Change

3

Neither Physical nor Chemical

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Fill in the Blank

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A melting popsicle is a _____ change.

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Fill in the Blank

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Burning wood is a ______________ change.

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Multiple Choice

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Mixing sugar and powdered drink mix.

1

Physical Change

2

Chemical Change

3

Neither Physical nor Chemical

4

Both Physical and Chemical

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Multiple Choice

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Flammability means that the matter has the ability to ____________.

1

explode

2

react

3

burn

4

spill

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​Change in Color

A change in color is also another characteristic of a chemical reaction taking place. For example, if one were to observe the rusting of metal over time, one would realized that the metal has changed color and turned orange. This change in color is evidence of a chemical reaction. However, one must be careful; sometimes a change in color is simply the mixing of two colors, but no real change in the composition of the substances in question.

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Multiple Choice

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A saw cuts a log and creates sawdust.

1

Physical Change

2

Chemical Change

3

Both Physical and Chemical 

4

Neither Physical nor Chemical

Physical and chemical changes

by: C. McClammey

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