Ch 9 Section 1

Question 1

composition stoichiometry deals with the mass relationships of

Answer 1

elements in compounds

Question 2

reaction stoichiometry involves the mass relationships between

Answer 2

reactants and products in a chemical reaction

Question 3

reaction stoichiometry is based on chemical

Answer 3

equations and the law of conservation of mass

Question 4

all reaction stoichiometry calculations start with a

Answer 4

balanced chemical equation

Question 5

this balanced chemical equation gives the relative numbers of

Answer 5

moles of reactants and products

Question 6

reaction stoichiometry problems can be classified according to the information….and the information you are….

Answer 6

given in the problem; expected to find, the unknown

Question 7

given and unknown may both be

Answer 7

reactants, products, or one may be a reactant and the other a product

Question 8

masses are generally expressed in

Answer 8

grams

Question 9

stoichiometric problems are solved by using ratios from the balanced equation to

Answer 9

convert the given quantity by using methods described

Question 10

when amount in moles is given and you must find amount in moles of another substance general plan is:
amount of given substance (mol)→

Answer 10

amount of unknown substance (mol)

Question 11

when given amount in moles and asked to calculate the mass of another substance, general plan is:
amount of given substance (mol)→

Answer 11

amount of unknown substance (mol)→mass of unknown substance (g)

Question 12

when given mass of one substance and asked to calculate moles of another, general plan is:
mass of given substance (g)→

Answer 12

amount of given substance (mol)→amount of unknown substance(mol)

Question 13

when you are given the mass of a substance and asked to calculate mass of another substance, general plan is:
mass of given substance (g)→

Answer 13

amount of given substance (mol)→ amount of unknown substance (mol)→mass of unknown substance (g)

Question 14

solving any reaction stoichiometry problem requires the use of a mole ratio to convert from moles or grams of one substance to

Answer 14

moles or grams of another substance

Question 15

a mole ratio is a conversion factor that relates the amounts in moles of any

Answer 15

two substances involved in a chemical reaction

Question 16

the mole ratio is obtained directly from the

Answer 16

balanced chemical equation

Question 17

coefficients in a chemical equation satisfy the law of conservation of matter and represent the

Answer 17

relative amounts in moles of reactants and products

Question 18

mole ratios are exact, so they do not limit the

Answer 18

number of significant figures in a calculation

Question 19

molar mass is the conversion factor that relates the mass of a substance to the

Answer 19

amount in moles of that substane

Question 20

to solve reaction stoichiometry problems, you will need to determine molar masses using

Answer 20

the periodic table