chem end of ch 4

Question 1

oxidation numbers: free elements

Answer 1

0

Question 2

oxidation numbers: alkali metals

Answer 2

+1

Question 3

oxidation numbers: oxygen

Answer 3

-2 (except in peroxide when it’s -1)

Question 4

oxidation numbers: hydrogen

Answer 4

+1 except when its bonded to a metal and then is -1)

Question 5

oxidation numbers: in a compound

Answer 5

add up to the total charge (0 if neutral)

Question 6

molarity formula

Answer 6

M= mol solute/ Lsoln

Question 7

how to calculate the mass of solute needed to make a stock solution of a given Molarity, also given volume

Answer 7

volume x 1L/1000mL x __mol/1Lsoln= _____mol solute

____mol x molmass/1mol= ____gsolute

Question 8

if titration is done correctly, how much acid and base is left

Answer 8

acid and base is all gone (equivalence point)

Question 9

which is the limiting reactant in a titration

Answer 9

both are limiting, no excess

Question 10

how do you do titration

Answer 10

write our reaction & balance, start w/ the compound you have the most info about.
given mL x 1L/1000mL x mol of same given/1L x molar ratio = mol