Ch. 9 Stoichiometry
To balance a chemical equation, it may be necessary to adjust the
Coefficiants
Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?
Stoichiometry
In what kind of reaction do two or more substances combine to form a new compound?
Synthesis reaction.
In the chemical equation wA + xB -> yC + zD, if one knows the mass of A and the molar masses of A, B, C, and D, one can determine
The mass of any of the reactants or products.
What is the measured amount of a product obtained from a chemical reaction?
actual yield.
If one knows the mole ratio of a reactant and product in a chemical reaction, one can
calculate the mass of the product produced from a known mass of a reactant
A chemical reaction involving substances A and B stops when B is completely used. B is the...
limiting reactant
What reactant controls the amount of product formed in a chemical reaction?
limiting reactant
If no one knows the mass and molar mass of reactant A and the molar mass of product D in a chemical reaction, one can determine the mass of product D produced by using the....
mole ratio of D to A from the chemical equation.
A balanced chemical equation allows one to determine the
mole ratio of any 2 substances.
A chemist interested in the efficiency of a chemical reaction would calculate the
percentage yield
What is the ratio of the actual yield to the theoretical yield, multiplied by 100%?
percentage yield.
When the limiting reactant in a chemical equation is completely used, the......
reaction stops.
A chemical equation is balanced when the
same number of each kind of atom appears in the reactants and products.
If the percentage yield is equal to 100% then
the actual yield is equal to the theoretical yield
To determine the limiting reactant in a chemical reaction involving known masses of A and B, one could first calculate...
the number of moles of B and the number of moles of A available.
What is the maximum possible amount of product obtained in a chemical reaction?
theoretical yield.
