Unit 3

Question 1

The mol

Answer 1

counting unit. contains 6.02X10^3

Question 2

n

Answer 2

mols

Question 3

m

Answer 3

mass

Question 4

M

Answer 4

molar mass

Question 5

Na

Answer 5

Avagadros number

Question 6

What do units always have to do?

Answer 6

Cancel each other out

Question 7

What is the only unit that can be directly compared?

Answer 7

mols

Question 8

Law of definite proportions

Answer 8

The elements in a compound are always present in the same proportion by mass

Question 9

Percentage composition

Answer 9

Proportion of each chemical in the compound by mass

Question 10

How to solve empirical formula questions

Answer 10

Convert % to g(always assume 100 g)
Convert g to mols
Divide by smallest number

Question 11

How to solve molecular formula questions

Answer 11

Molar mass of compound/ molar mass of empirical formula

Question 12

% yield

Answer 12

actual yield/ theoretical yield

Question 13

What do all calculations have to be made with?

Answer 13

the limiting re agent

Question 14

Qualitative

Answer 14

Identifying substances, no numbers involved

Question 15

Quantitative

Answer 15

Providing numerical data