Calculations

Question 1

actual yield

Answer 1

amount of product we get in a reaction

Question 2

RAM

Answer 2

relative atomic mass.
The mass of 1 mole of an element relitive to 1/12th to the mass of 1 mol of carbon12

Question 3

What does Avogadros number represent?

Answer 3

NUMBER OF PARTICLES IN ONE MOLE OF A SUBSTANCE

Question 4

purity %

Answer 4

mass of pure/ mass of impure x100

Question 5

Emperical formula

Answer 5

shows the simplest whole number ratio of elements in a compoud

Question 6

Molecular formula

Answer 6

ACTUAL number of atoms in a molecule

Question 7

how to work out emperical formula

Answer 7

1. note element and mass
2. divide each by atomic mass
3. divide each answer by the smallest number
4. multiply if not a whole number
   this is ratio!!!

Question 8

how to work out molecular formula

Answer 8

find molar mass of emperical formula
2. divide mollecular formula Mr by empericl formular molar mass
3. use this number to multiply emperical formula ratio

Question 9

def. of molar volume of gas

Answer 9

1 mole of any gas at room temperature (25oC) and room pressure (1atm) occupies a volume of 24.8L

Question 10

theeoretical yield

Answer 10

max amt of product we could get from a given amt of reactants if we had no side reactions and all reactants collided successfully

Question 11

percentage yield

Answer 11

actual yield/theoretical yield x100

Question 12

molar concentrate definition

Answer 12

number of moles of solute per volume solution

Question 13

TITRATION

Question 14

Standard solution

Answer 14

solution of accurately known concentration

Question 15

Aliquot

Answer 15

accurately known volume of the reagent solution w unknown concentration

Question 16

Indicator

Answer 16

gives visual indication of when reaction is complete