Chemistry Reactions Quiz

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What is an exothermic reaction?

Reaction in which heat is released along with the formation of products.

Give an example of an exothermic reaction related to respiration.

Respiration

What are decomposition reactions?

Reactions in which a single substance decomposes to give two or more substances.

What is a thermal decomposition reaction?

Reaction carried out by heating. Signup and view all the answers

Define endothermic reactions.

Reactions that require energy in the form of heat, light, or electricity. Signup and view all the answers

Give an example of a displacement reaction.

Displacement Reaction Signup and view all the answers

What type of reaction is it when fats and oils become rancid due to oxidation?

Oxidation Signup and view all the answers

Why are antioxidants added to foods containing fats and oil?

To prevent rancidity Signup and view all the answers

What type of reaction occurs when copper vessels lose their shine when exposed to air?

Oxidation Signup and view all the answers

Which gas is produced when dilute hydrochloric acid acts on zinc granules?

Hydrogen gas Signup and view all the answers

What type of reaction is represented by the equation: Fe2O3 + 2Al → Al2O3 + 2Fe?

Redox reaction Signup and view all the answers

What type of reaction absorbs energy?

Endothermic reaction Signup and view all the answers

Why does the color of copper sulfate solution change when an iron nail is dipped into it?

Redox reaction Signup and view all the answers

Give an example of a decomposition reaction that proceeds by absorbing electric energy.

Electrolysis of water Signup and view all the answers

What is a chemical reaction?

Whenever a chemical change occurs. Signup and view all the answers

How can we recognize a chemical reaction?

By observing changes in state, color, evolution of gas, or change in temperature. Signup and view all the answers

Why is it important to balance a chemical equation?

To ensure that the number of atoms of each element remains the same on both sides of the equation. Signup and view all the answers

What is a combination reaction?

A reaction where two or more substances combine to form a new single substance. Signup and view all the answers

What does the symbol (aq) represent in a chemical equation?

Aqueous solution. Signup and view all the answers

How is the physical state of reactants and products indicated in a chemical equation?

By using (g) for gas, (l) for liquid, (s) for solid. Signup and view all the answers