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Chemical Reactions Quiz

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Questions and Answers

What can be inferred about a chemical change?

The temperature of the substance changes.

The substance changes color.

The nature and identity of the initial substance change. (correct)

The substance changes state from solid to liquid.

What is the purpose of Activity 1.1 according to the text?

To find the answer to what is meant by a chemical reaction. (correct)

To measure the temperature change in substances.

To observe physical changes in substances.

To identify changes in color of substances.

What is a chemical reaction?

A change in physical state of a substance.

A process where a chemical change occurs. (correct)

A change in color of a substance.

A change in temperature of a substance.

What happens when grapes get fermented?

A chemical change occurs. Signup and view all the answers

How do we know that a chemical reaction has taken place?

When a chemical change occurs. Signup and view all the answers

What happens when food gets digested in our body?

The nature and identity of the initial substance have somewhat changed. Signup and view all the answers

What is the outcome when milk is left at room temperature during summers?

It undergoes a chemical change. Signup and view all the answers

What happens when an iron tawa/pan/nail is left exposed to humid atmosphere?

It undergoes corrosion through a chemical change. Signup and view all the answers

What do we call it when a chemical change occurs?

A chemical reaction Signup and view all the answers

What happens when we respire?

A chemical reaction takes place in our body. Signup and view all the answers