Checkpoint: Physical and Chemical Changes

What are physical properties?

• Properties such as size, colour and state of a substance are called its physical properties.

• Properties such as shape, size, colour and state of a substance are called its physical properties.

• Properties such as shape, size, colour and state of a matter are called its physical properties.

What is a physical change?

• A change in which a substance undergoes a change in its physical properties is called a physical change.

• A change in which a substance undergoes a change in its chemical properties is called a physical change.

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NGSS.MS-PS1-4

Why is tearing a sheet of paper into pieces a physical change?

• Tearing of a paper is a physical change because when the paper is torn only the shape and size of the paper is changed, no new substance is formed.

• Tearing of a paper is a physical change because when the paper is torn only the shape and size of the paper does not change and new substance is formed.

What is a chemical reaction?

• A change in which one or more new substances are formed is called a chemical change. A chemical change is also called a chemical reaction.

• A change in which two or more new substances are formed is called a chemical change. A chemical change is also called a chemical reaction.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical change

• changes the physical properties of an object, but does not create a new substance.

• creates a new substance and cannot be undone.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these examples is a physical change?

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NGSS.MS-PS1-2

Is this a physical or chemical change?

• chemical change

• physical change

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NGSS.MS-PS1-2

Is this an example of a physical or chemical change?

• physical

• chemical

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NGSS.MS-PS1-4

Is this an example of a physical or chemical change?

• physical

• chemical

Tags

NGSS.MS-PS1-2

Is this an example of a physical or chemical change?

• physical

• chemical

Tags

NGSS.MS-PS1-2