C4 Chemical Calcualtiona (oh Hell No)

Question 1

Whats a mole

Answer 1

The mass of a substance that contains 6.02 x 10 -23 particles

Question 2

Gove the value for Avogrado’s constant

Answer 2

6.02 x 10 ^-23

Question 3

How to calculate number of moles from mass and Mr

Answer 3

Mass/Mr

Question 4

How to calculate mass from moles and Mr

Answer 4

Moles x Mr

Question 5

Whats a limiting reactant

Answer 5

The reactant that is completely used up first in a reaction

Question 6

If a reactant isnt all used up it is in…

Answer 6

Excess

Question 7

Whats the unit for concentration

Answer 7

Dm3

Question 8

How to calculate concentration from mass and volume

Answer 8

Mass/volume

Question 9

How to calculate volume from concentration and mass

Answer 9

Mass / concentration

Question 10

How to convert from cm3 to dm3

Answer 10

divide by 1000

Question 11

How can concentration in mol/dm3 be calculated

Answer 11

Moles/volume

Question 12

Whats does Mr mean

Answer 12

Relative masses of all the atoms in a formula

Question 13

Whats the law of co servation of madd

Answer 13

Total mass of reactants = total mass of products

Question 14

Whats the empirical ratio

Answer 14

A ratio that shows the simplest hole number ratio of atoms in each element within a compound

Question 15

How to work out empirical ratio

Answer 15

Find Mass and Mr. Divided them. Find ratio. Turn it into simplest ratio. E.g. if its 0.1 and 0.2 they equal 1 and 2.

Question 16

How to find how many atoms are in an element

Answer 16

Mass divided by molar mass x Avogrado number

Question 17

How to find uncertainty

Answer 17

Find mean (ignore anomalies and to 2sg)
Find range
Divide range by 2.

Question 18

How to calculate number of reacted moles

Answer 18

Mass(product) - mass (solute)
Divide by relative formula mass

E.g. 2.0 - 1.2 = 0.08. 0.08 / 2 x 16 (oxygen) = 32
0.08/32 = answer

Question 19

How to calculate maximum mass of element produced

Answer 19

Find moles
Using required moles times by RAM

Question 20

How to find mass of element produced (with mass example. E.g. 6g of copper produces 7g of copper oxide. Calculate the mass of copper oxide when 0.50g of copper reacts with oxygen)

Answer 20

Mass (product) e.g. 7 / mass (original) e.g. 6
X by mass. (E.g. 0.5g)

Question 21

Why would you not use electrolysis to extract a more reactive metal than with reduction through carbon e.g.

Answer 21

Because aluminium is more reactive
Therefore it won’t be displaced by Carbon

Question 22

What is electrolysis

Answer 22

The process of breaking down metals through electricity