Chemistry Stoichiometry Review

Front

What is Stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.

Front

What is a Limiting Reactant?

Back

The limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product that can be formed.

Front

What is an Excess Reagent?

Back

An excess reagent is a reactant that remains after a chemical reaction has gone to completion.

Front

How do you determine the number of moles of a product formed?

Back

Use the mole ratio from the balanced chemical equation to convert moles of reactants to moles of products.

Front

Given the reaction 2H₂ + O₂ → 2H₂O, how many moles of water are produced from 4 moles of O₂?

Back

4 moles of water are produced.

Front

What is the mole ratio of H₂ to H₂O in the reaction 2H₂ + O₂ → 2H₂O?

Back

The mole ratio is 2:2 or 1:1.

Front

If you have 10 moles of H₂ and 5 moles of O₂, which is the limiting reactant?

Back

O₂ is the limiting reactant.

Front

What is the purpose of a balanced chemical equation?

Back

A balanced chemical equation ensures that the number of atoms for each element is conserved in a reaction.

Front

How many moles of O₂ are needed to react with 8 moles of H₂ in the reaction 2H₂ + O₂ → 2H₂O?

Back

4 moles of O₂ are needed.

Front

What happens when the limiting reactant is used up?

Back

The chemical reaction stops when the limiting reactant is used up.