AP Chem Stoichiometry Practice

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

Define 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 percent yield?

Back

Percent yield is a measure of the efficiency of a reaction, calculated as (actual yield / theoretical yield) x 100%.

Front

How do you determine the theoretical yield?

Back

The theoretical yield is determined by calculating the maximum amount of product that can be formed from the given amounts of reactants, based on stoichiometric ratios.

Front

What is the mole ratio in a balanced chemical equation?

Back

The mole ratio is the ratio of moles of one substance to the moles of another substance in a balanced chemical equation, used to convert between moles of reactants and products.

Front

How do you calculate the mass of a product formed in a reaction?

Back

To calculate the mass of a product, use the formula: mass = moles x molar mass, where moles are determined from the stoichiometry of the reaction.

Front

What is the molar mass of NaOH?

Back

The molar mass of NaOH (sodium hydroxide) is approximately 40.00 g/mol.

Front

What is the balanced equation for the reaction of sodium with water?

Back

The balanced equation is: 2Na + 2H2O → 2NaOH + H2.

Front

How do you identify the excess reactant?

Back

The excess reactant is the substance that remains after the limiting reactant is completely consumed in a chemical reaction.

Front

What is the significance of a balanced chemical equation?

Back

A balanced chemical equation shows the conservation of mass, indicating that the number of atoms of each element is the same on both sides of the equation.