FREE CART Chemical Reactions Questions and Answers

Question 1

Which of the following is a balanced equation for the combustion of methane (CH₄)?

Accepted Answer

CH₄ + 2O₂ → CO₂ + 2H₂O

Answer

CH₄ + O₂ → CO₂ + H₂O

Answer

CH₄ + O₂ → CO + H₂O

Answer

CH₄ + 3O₂ → 2CO₂ + 2H₂O

Question 2

What type of reaction is represented by the equation: 2H₂ + O₂ → 2H₂O?

Accepted Answer

Synthesis reaction

Answer

Decomposition reaction

Answer

Single displacement reaction

Answer

Double displacement reaction

Question 3

In a chemical reaction, the substances that are present at the beginning and undergo change are called:

Accepted Answer

Reactants

Answer

Products

Answer

Catalysts

Answer

Inhibitors

Question 4

Which of the following represents a double displacement reaction?

Accepted Answer

AB + CD → AD + CB

Answer

AB → A + B

Answer

A + BC → AC + B

Answer

A + B → AB

Question 5

What is the law that states that mass is neither created nor destroyed in a chemical reaction?

Accepted Answer

Law of Conservation of Mass

Answer

Law of Definite Proportions

Answer

Law of Multiple Proportions

Answer

Law of Conservation of Energy