FREE RPAL Reactants Questions and Answers

Question 1

What is a reactant in a chemical reaction?

Accepted Answer

A substance that undergoes change during a reaction

Answer

Reactants are the starting materials in a chemical reaction that are transformed into products.

Question 2

Which of the following correctly describes the role of reactants in a chemical equation?

Accepted Answer

Reactants are the substances that react to form new products

Answer

Reactants participate in the chemical reaction, and their interaction results in the formation of products.

Question 3

In the chemical equation 2H₂ + O₂ → 2H₂O, which are the reactants?

Accepted Answer

H₂ and O₂

Answer

In this equation, hydrogen (H₂) and oxygen (O₂) are the reactants that combine to form water (H₂O).

Question 4

If you start a reaction with 5 moles of reactant A and 3 moles of reactant B, but only 2 moles of reactant A are required, what happens to the excess reactant A?

Accepted Answer

It remains unreacted as a leftover

Answer

The excess reactant A that is not required for the reaction remains unreacted as a leftover.

Question 5

How can you identify the limiting reactant in a chemical reaction?

Accepted Answer

It is the reactant that produces the least amount of product

Answer

The limiting reactant is the one that is completely consumed first, limiting the amount of product that can be formed.

RPAL - Reactants, Products, and Leftovers Practice Test

RPAL - Reactants, Products, and Leftovers Practice Test

FREE RPAL Reactants Questions and Answers