Physical and Chemical Changes 7th Grade Final

What is the main difference between physical and chemical changes?

• A) Physical changes involve a change in color, while chemical changes do not.

• B) Physical changes alter the molecular structure, while chemical changes do not.

• C) Physical changes do not create new substances, while chemical changes do.

• D) Physical changes require energy, while chemical changes do not.

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NGSS.MS-PS1-4

Which of the following is an example of a physical change?

• A) Iron rusting

• B) Ice melting

• C) Wood burning

• D) Baking a cake

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NGSS.MS-PS1-4

When ice melts into water, what type of change is occurring?

• A) Chemical change

• B) Physical change

• C) Both physical and chemical change

• D) No change at all

Why is cutting a piece of paper considered a physical change?

• A) It changes the chemical composition of the paper.

• B) The paper can be reassembled into its original form.

• C) It creates new substances.

• D) It involves a change in temperature.

Which of the following indicates a chemical change?

• Change in shape

• Change in texture

• Change in color

• Change in size

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NGSS.MS-PS1-2

What happens to the molecular structure of a substance during a chemical change?

• It remains the same.

• It is altered to form new substances.

• It becomes larger.

• It evaporates.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

When wood burns in a fireplace, what are the new substances formed?

• Water and ice

• Ash, carbon dioxide, and water vapor

• smoke, charcoal and ash

• Earth Wind & Fire

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT a sign of a chemical change?

• A) Production of gas

• B) Formation of a precipitate

• C) Change in mass

• D) Change in color

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NGSS.MS-PS1-2

What is the result of mixing baking soda and vinegar?

• A) A solid precipitate forms.

• B) A gas is produced.

• C) The temperature decreases.

• D) No reaction occurs.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Why does rust form on iron when exposed to moisture and air?

• It is a physical change.

• It is a chemical change that alters the iron's properties.

• It is a reversible change.

• It is a result of temperature change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5