Topic 0- Stoichiometry

Question 1

What is stoichiometry

Answer 1

quantitative relationship between reactants and products
-atoms cannot be destroyed or created
-before and after reactions are always the same

Question 2

Combination reaction

Answer 2

when two or more substances react to form one product

Question 3

decomposition reaction

Answer 3

when one substance breaks down into two or more substances

Question 4

combustion reaction

Answer 4

-rapid
-produces a flame
-involve CO2 and H20

Question 5

conversion between mg and g

Answer 5

mg to g- divide by 1000
g to mg- multiply by 1000

Question 6

conversion between kg and g

Answer 6

kg to g- multiply by 1000
g to kg- divide by 1000

Question 7

conversion between mL and L

Answer 7

mL to L- divide 1000
L to mL- multiply 1000

Question 8

steps for empirical formula

Answer 8

-turn g to mol
-find smallest mol
-divide all by smallest
-multiply if needed to get whole ratio

Question 9

molecular vs empirical formula

Answer 9

M- regular formula
E-ratio, same if cant be reduced

Question 10

limiting vs excess reactants

Answer 10

LR- one that is used up first (smallest moles)
ER- reactants left

Question 11

steps to finding excess reactants

Answer 11

-use reactant to product for moles/theo to find
LR
-go back and use reactants to reactants using MOLES of LR
-find mols used and sub from GIVEN MOLS of excess

Question 12

theoretical yield

Answer 12

the amount of product that can be made if all LR is used up (rare)

Question 13

actual yeild

Answer 13

the amount of product obtained from experiment

Question 14

percent yeild formula

Answer 14

actual/theoretical x 100%