Stoichiometry

Question 1

A pure substance composed of two or more elements in a fixed proportion

Answer 1

compound

Question 2

a combination of two or more atoms held together by covalent bond; the smallest unit of a compound that still displays properties of that compound

Answer 2

molecule

Question 3

the amount of a substance that contains the same number of particles found in a 12 g sample of carbon-12

Answer 3

mole

Question 4

the gram equivalent weight is equal to

Answer 4

molar mass / number of H ions an acid can donate per molecule or number of OH ions a base can donate

Question 5

States that all samples of a given compound will contain the same elements in identical mass ratios

Answer 5

law of constant composition

Question 6

the formula that gives the simplest whole number ratio of elements in a compound

Answer 6

empirical formula

Question 7

formula that gives the exact number of atoms of each element in the compound

Answer 7

molecular formula

Question 8

The mass of X in the formula / formula weight of the compound

Answer 8

percent composition

Question 9

The reactant that is consumed first

Answer 9

limiting reagent

Question 10

The reactant that remains after the limiting reagent is used up

Answer 10

excess reactant

Question 11

The amount of product that can be predicted from a balanced equation, assuming that all the limiting reagent has been used, no competing side reactions have occurred, and all the product has been collected

Answer 11

theoretical yield

Question 12

amount of product isolated from the reaction experimentally

Answer 12

actual yield

Question 13

Some reasons why the actual yield is ___ than the theoretical yield are that many reactions are _____, or use reactants that interact with one another to produce __ ___ ___.

Answer 13

less, reversible, additional end products

Question 14

percent yield is equal to

Answer 14

actual yield / theoretical yield