chaper 8 & 9 test

Question 1

chemical reaction

Answer 1

material changing from a beginning mass to a resulting substance.

Question 2

signs that chemical reaction has occurred

Answer 2

color change, solid form, bubbles of gas form, increase/decrease of temp, color disappears

Question 3

synthesis reaction formula

Answer 3

a + b > ab

Question 4

synthesis example

Answer 4

c + o2 > co2

Question 5

decomposition formula

Answer 5

ab > a + b

Question 6

decomposition example

Answer 6

2h20 > 2h2 + o2

Question 7

single replacement formula

Answer 7

a + bc > b + ac

Question 8

single replacement example

Answer 8

al + cucl2 > cu + alcl3

Question 9

double replacement formula

Answer 9

ab + cd > ad + bc

Question 10

double replacement example

Answer 10

pb(no3)2 + k2cro4 > pbcro4 + 2kno3

Question 11

combustion formula

Answer 11

CxHy + o2 > h2o + co2

Question 12

combustion example

Answer 12

ch4 + o2 > h2o + co2

Question 13

stoichiometry

Answer 13

studies amounts of substances that are involved in reactions

Question 14

5 things you might look at when doing stoichiometry problems

Answer 14

mass of reactants 
mass of products 
chemical equations 
molecular equations 
formulas

Question 15

coefficients can represent

Answer 15

molecules or moles

Question 16

converting between moles and grams can easily be done when what is known

Answer 16

atomic/ molecular mass

Question 17

the reactant that runs out before the other in a reaction

Answer 17

limiting reagent

Question 18

what type of ratio is of central importance in solving stoichiometry problems

Answer 18

molar ratio

Question 19

sources of molar ratios

Answer 19

coefficients of balanced equation

Question 20

you cannot do stoichiometry problems correctly without what

Answer 20

balanced equation

Question 21

what’s the most common type of stoichiometry calculation

Answer 21

mass-mass problem

Question 22

what did the mass-mass calculation question look like?

Answer 22

given this amount of reactant, how much product will it form?

Question 23

6 steps to solve a mass mass problem

Answer 23

write balanced equation 
write mass on factor label form 
convert mass to moles
convert reactant moles to product moles 
convert product moles to grams 
do math

Question 24

when does a reaction stop?

Answer 24

when the limiting reactant is completely consumed

Question 25

what are excess reactants

Answer 25

any remaining reactants

Question 26

which reactant determines the amount of product formed

Answer 26

limiting reactant