11. 1 Identifying Physical and Chemical Changes

Complete the sentences below.

 

A change in which no new substances are formed is called a __________ change.

 

A change in which new substances are formed is called a ___________ change.

(a)  

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Fill in the blank: Substances that react with each other are known as (a)   .

Fill in the blank: The new substances formed in a chemical reaction are known as (a)   .

In a chemical reaction, the substances that react with each other are called the _____ . The new substances that are formed are called the _____ .

• products; reactants

• reactants; products

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NGSS.MS-PS1-5

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

• A) Burning of carbon

• B) Freezing of water

• C) Heating of calcium carbonate

• D) Formation of carbon dioxide.

Is dissolving table salt in water a chemical change?

• Yes, it forms a new substance.

• No, it is a physical change.

• Yes, it cannot be reversed.

• No, it is a chemical change.

Explain why a metal sphere being heated is considered a physical change and not a chemical change.

(a)  

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

• Burning wood

• Dissolving sugar in water

• Rusting iron

• Baking a cake

Which of the following statements is true?

• Physical changes are not reversible.

• Chemical changes do not form new substances.

• Physical changes can be reversed using separation techniques.

• Chemical changes can be easily reversed.

Which of the following statement(s) is/are true about chemical changes? You may select more than one statement.

• New substance(s) is/are formed.

• The substances that react with one another are known as the “products”.

• Chemical changes are usually not reversible.

• Energy may be taken in or given out during chemical changes.

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NGSS.MS-PS1-5

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