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Chemical Reactions Class 10 Quiz

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Questions and Answers

What is a chemical reaction?

The change in physical state of a substance

The combination of two substances to form a new substance

The transformation of chemical substance into another chemical substance (correct)

The rearrangement of atoms within a substance

What are the substances that take part in a chemical reaction called?

Catalysts

Inhibitors

Products

Reactants (correct)

What are the new substances formed as a result of a chemical reaction called?

Precursors

Products (correct)

Byproducts

Reactants

What is the purpose of cleaning the magnesium ribbon by rubbing with sandpaper before burning in air?

To remove the protective layer of basic magnesium carbonate Signup and view all the answers

Which characteristic is associated with the chemical reaction between zinc and dilute sulphuric acid?

Evolution of hydrogen gas Signup and view all the answers

What is the purpose of balancing chemical equations?

The purpose of balancing chemical equations is to ensure that the law of conservation of mass is obeyed, meaning that the same number of each type of atom must appear on both sides of the equation. Signup and view all the answers

Explain the difference between reactants and products in a chemical reaction.

Reactants are the substances that take part in a chemical reaction, while products are the new substances formed as a result of the chemical reaction. Signup and view all the answers

Why is the burning of magnesium in the air considered a chemical reaction?

The burning of magnesium in the air is considered a chemical reaction because it results in the formation of a new substance, magnesium oxide, which has different properties from the original magnesium. Signup and view all the answers

What is the significance of the transformation of chemical substances in a chemical reaction?

The significance of the transformation of chemical substances in a chemical reaction is that it leads to the formation of new substances with different properties, indicating a chemical change. Signup and view all the answers

Why is it necessary to remove the protective layer of basic magnesium carbonate from the surface of the magnesium ribbon before burning in air?

It is necessary to remove the protective layer of basic magnesium carbonate to allow the underlying magnesium to react with oxygen, forming magnesium oxide, during the burning process. Signup and view all the answers