4.1 Understanding Physical and Chemical Changes

Which of the following scenarios best illustrates a physical change?

• Burning a piece of paper

• Melting ice into water

• Rusting of iron

• Baking a cake

A student observes a color change when two clear solutions are mixed. What type of change does this most likely indicate?

• Physical change

• Chemical change

• Phase change

• Dissolution

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NGSS.MS-PS1-2

Which of the following is an example of a chemical change occurring in everyday life?

• Freezing water to make ice cubes

• Dissolving sugar in tea

• Cooking an egg

• Breaking a glass

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Consider the process of dissolving salt in water. Which statement best describes this process?

• It is a chemical change because new substances are formed.

• It is a physical change because the salt can be recovered by evaporation.

• It is a chemical change because the salt disappears.

• It is a physical change because it involves a change in state.

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NGSS.MS-PS1-2

NGSS.MS-PS1-4

Which of the following observations would most likely indicate a chemical change?

• A solid melting into a liquid

• A liquid evaporating into a gas

• A solid forming from two liquids

• A gas condensing into a liquid

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

A piece of metal is heated until it glows red. What type of change is this, and why?

• Physical change, because the metal's composition remains the same.

• Chemical change, because the metal changes color.

• Physical change, because the metal is melting.

• Chemical change, because the metal is reacting with air.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following processes is a chemical change that occurs in the kitchen?

• Chopping vegetables

• Boiling water

• Toasting bread

• Mixing flour and sugar

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student mixes vinegar and baking soda, resulting in bubbling and fizzing. What does this indicate about the type of change?

• It is a physical change because no new substances are formed.

• It is a chemical change because a gas is produced.

• It is a physical change because the substances are mixed.

• It is a chemical change because the temperature decreases.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is an example of a physical change that can be reversed?

• Burning wood

• Rusting of iron

• Freezing water

• Baking a cake

When a candle burns, both physical and chemical changes occur. Which part of the process is a chemical change?

• The melting of the wax

• The solidification of melted wax

• The production of carbon dioxide and water

• The dripping of wax

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5