Chemical Reactions and Equations Quiz

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Questions and Answers

What happens when food is cooked?

The nature and identity of the food remain the same
A chemical change occurs (correct)
The food becomes poisonous
A physical change occurs

Which of the following situations is an example of a chemical change?

Food getting digested in our body
Grapes getting fermented (correct)
Leaving milk at room temperature during summers
Leaving an iron tawa/pan/nail exposed to humid atmosphere

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

By observing a change in color
By observing the formation of a gas
By observing the release of energy
All of the above (correct)

What is the difference between a physical change and a chemical change?

Physical changes involve a change in the state of matter, while chemical changes involve a change in the composition of matter (C) Signup and view all the answers

What is the main purpose of the activities mentioned in the text?

To explain the concept of chemical reactions (A) Signup and view all the answers

Which of the following is NOT an example of a chemical change?

An iron tawa/pan/nail left exposed to humid atmosphere (D) Signup and view all the answers

What is the main difference between a physical change and a chemical change?

Physical changes involve a change in the state of matter, while chemical changes involve a change in the composition of matter (D) Signup and view all the answers