Chemistry and Stoichiometry

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 a limiting reactant.

Back

A 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 the formula for percent yield?

Back

Percent yield = (Actual yield / Theoretical yield) x 100%.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure that the number of atoms for each element is the same on both sides of the equation.

Front

What is the theoretical yield?

Back

The theoretical yield is the maximum amount of product that can be produced from a given amount of reactants, calculated based on stoichiometric ratios.

Front

What is the difference between actual yield and theoretical yield?

Back

Actual yield is the amount of product actually obtained from a reaction, while theoretical yield is the calculated maximum amount based on stoichiometry.

Front

How many moles of a substance are in 12 grams of carbon (C)?

Back

The number of moles = mass (g) / molar mass (g/mol). For carbon, moles = 12 g / 12 g/mol = 1 mole.

Front

What is the molar mass of KCl?

Back

The molar mass of KCl (Potassium Chloride) is approximately 74.55 g/mol.

Front

What is the balanced equation for the decomposition of potassium chlorate (KClO3)?

Back

2 KClO3 → 2 KCl + 3 O2.

Front

How do you determine the excess reactant in a reaction?

Back

To determine the excess reactant, calculate the amount of each reactant needed to completely react with the limiting reactant and compare it to the initial amounts.