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Chemical Reactions and State Changes

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Questions and Answers

What is the primary characteristic of an exothermic reaction?

Energy is released in the form of heat (correct)

Energy is absorbed from the surroundings

A precipitate is formed as a product

There is a change in the state of the reactants

What is the term for the formation of an insoluble substance in a chemical reaction?

Combustion reaction

Precipitate (correct)

Exothermic reaction

Endothermic reaction

Which type of reaction involves the release of heat energy?

Exothermic reaction (correct)

Combination reaction

Decomposition reaction

Endothermic reaction

What is the term for a reaction in which energy is absorbed from the surroundings?

Endothermic reaction Signup and view all the answers

What is the result of a chemical reaction in which a solid product is formed from gaseous or liquid reactants?

Change of state Signup and view all the answers

What type of reaction is characterized by the formation of a solid product from two soluble salts in aqueous solution?

Precipitation reaction Signup and view all the answers

What is the primary criterion for a chemical reaction to occur?

Rearrangement of structure of the substance Signup and view all the answers

What type of reaction involves the conversion of one state of matter to another?

Chemical change of state Signup and view all the answers

Which of the following is an example of a chemical reaction with a change in colour?

Iron rusting Signup and view all the answers

What is the term for the formation of an insoluble solid from a liquid solution?

Precipitation Signup and view all the answers

What is the result of a chemical reaction when zinc reacts with sulphuric acid?

Evolution of hydrogen gas Signup and view all the answers

What is the term for the process of conversion of one state of matter to another?

Change of state Signup and view all the answers

What is the primary characteristic that distinguishes a chemical change from a physical change?

One or more new substances with new physical and chemical properties are formed Signup and view all the answers

Which of the following is NOT a characteristic of a chemical reaction?

The change in the identity of the substance remains the same Signup and view all the answers

What is the term for a reaction that involves the formation of a solid from a solution?

Formation of a precipitate Signup and view all the answers

Which of the following is an example of an exothermic reaction?

A reaction that releases heat and light Signup and view all the answers

What is the term for a reaction that involves the breaking or making of bonds between different atoms?

Chemical reaction Signup and view all the answers

Which of the following is a characteristic of a physical change?

The change in color or state occurs Signup and view all the answers