Chemical Reactions in Class 10

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Questions and Answers

Which of the following best describes a chemical reaction?

The transformation of a substance into a new and completely different substance (correct)
A change in state from solid to liquid
The rearrangement of atoms without forming a new substance
A physical change in properties of a substance

What is the term used to describe the substances that take part in a chemical reaction?

Agitators
Reactors
Catalysts
Reactants (correct)

In the context of chemical reactions, what does the evolution of gas typically indicate?

The release of energy
The formation of a solid product
The occurrence of a chemical reaction (correct)
The consumption of oxygen

What is the purpose of cleaning the magnesium ribbon before burning it in air?

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

What is the main purpose of a chemical equation?

To represent a chemical reaction using symbols and formulae (D) Signup and view all the answers

What is the difference between a balanced and unbalanced chemical equation?

The balanced equation has equal numbers of atoms of each element on both sides, while the unbalanced equation does not (B) Signup and view all the answers

Which characteristic of a chemical reaction is NOT represented by a chemical equation?

Change in state of substance (A) Signup and view all the answers

What do the reactants and products represent in a chemical equation?

Reactants represent the substances before the reaction, while products represent the substances after the reaction (B) Signup and view all the answers