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Chemical Reactions Quiz for Class 8

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Questions and Answers

What is the role of a catalyst in a chemical reaction?

Slows down the reaction

Initiates the reaction

Remains unchanged at the end of the reaction (correct)

Increases the yield of products

In a chemical equation, what does the coefficient represent?

State of matter of each substance

Temperature at which the reaction occurs

Identity of the compound

Number of atoms of each element (correct)

Which of the following is an example of a chemical reaction?

Breaking a glass

Burning of wood (correct)

Melting of ice

Mixing of salt in water

Study Notes

Chemical Reactions

A catalyst is a substance that speeds up a chemical reaction without being consumed or altered in the process.
In a chemical equation, the coefficient represents the number of molecules or atoms of a reactant or product involved in the reaction.

Examples of Chemical Reactions

A burning match, rusting of iron, and baking of bread are all examples of chemical reactions.

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Description

Test your knowledge of chemical reactions with this quiz designed for students in grade 8. Explore examples of chemical reactions, the role of catalysts, and the significance of coefficients in chemical equations.