Chem 20 review

Question 1

km to m

Answer 1

1 km is 1000 m

Question 2

m to cm

Answer 2

1 meter is 1000 cm

Question 3

cm to mm

Answer 3

1 cm is 10 mm

Question 4

kg to g

Answer 4

1 kg is 1000 g

Question 5

finding mass with unit analysis

Answer 5

MULTIPLY BY MOLAR MASS

Question 6

finding moles with unit analysis

Answer 6

DIVIDE by molar mass

Question 7

naming ionic

Answer 7

roman numerals if needed

add “ide” to second element

Question 8

naming molecular

Answer 8

mono 1 (only use on second element) 
di 2 
tri 3
tetra 4
penta 5
hexa 6
hepta 7 
octa 8 
nona 9 
deca 10

Question 9

balancing and need odd number of diatomic

Answer 9

use that number on the diatomic and DOUBLE all other coefficients

Question 10

gravimetric stoich steps

Answer 10

1) write a balanced equation
2) write knowns and unknowns under equation
3) convert given quantities to moles
4) use molar ratio from balanced equation to find moles of unknown
5) concert answer to desired units

Question 11

solutions stoich steps

Answer 11

1) write a balanced equation
2) write knowns and unknowns under equation
3) concert given quantities to moles using unit analysis or c=n/V
4) use molar ratio from balanced equation to find moles of unknown
5) concert answer to desired units using unit analysis or c=n/V

Question 12

net ionic equation steps

Answer 12

1) non ionic equation (regular balance equation)
2) total ionic equation (everything aq broken up into ions
3) net ionic equation (what’s leftover after you cancel spectator ions)

Question 13

sig dig rule for adding

Answer 13

use the least number of decimal places