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Unleash Your Inner Chemist

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Questions and Answers

Which of the following is true about chemical changes?

Chemical changes make new substances (correct)

Chemical changes do not involve a change in color or temperature

Chemical changes can easily be undone

Chemical changes do not produce explosions

What are some signs that a chemical change has occurred?

No materials being combined

No change in color or temperature

No new substance being formed

Bubbles being formed (correct)

How can scientists determine if a chemical change has occurred?

By asking if a substance was present before (correct)

By noticing a change in color or temperature

By observing the formation of bubbles

By combining two or more materials

What happens during a physical change?

The original substance is unchanged Signup and view all the answers

Can most chemical changes be easily undone?

No, most chemical changes cannot be easily undone Signup and view all the answers

What is a chemical change?

A chemical change is when two or more materials are combined and a new substance is formed. Signup and view all the answers

Give an example of a chemical change.

An example of a chemical change is when a nail rusts. Signup and view all the answers

How can you determine if a chemical change has occurred?

You can determine if a chemical change has occurred by noticing bubbles being formed, or a change in color or temperature. Signup and view all the answers

What is a physical change?

A physical change is when no new substance is formed. Signup and view all the answers

Give an example of a physical change.

An example of a physical change is whipping egg whites. Signup and view all the answers