C4

Question 1

Relative atomic mass, Ar

Answer 1

average mass of naturally occurring atoms of an element on a scale where the 12-carbon atom has a mass of exactly 12 units

Question 2

Define relative molecular mass, Mr

Answer 2

the sum of the relative atomic masses (relative formula mass or Mr will be used for ionic compounds)

Question 3

Avogadro’s number

Answer 3

-A mole contains 6.02 x 10^23 particles
-One mole of any substance contains this amount

Question 4

Molar mass

Answer 4

-is the mass of one mole
-same as relative atomic mass for elements
- sum of the relative atomic masses for the formula for compounds
- add symbol for grams per mole

Question 5

Limiting reactants

Answer 5

reactants that is used up first is the limiting reactant. The amount of products is directly proportionate to the amount of limiting reactant