Topic 1

Question 1

Weight of an electron

Answer 1

1/1837

Question 2

Oxidation (In terms of oxygen) is…

Answer 2

The gain of oxygen from a redox reaction

Question 3

Reduction (In terms of oxygen) is…

Answer 3

The loss of oxygen from a redox reaction

Question 4

The pneumonic for remembering which is reduction or oxidation in terms of electron transfer is..

Answer 4

O xidation
I s
L oss

R eduction
I s
G ain

Question 5

To find the isotope of a certain material…

Answer 5

((a% * aAr)+(b% * bAr)) / 100

Question 6

How do you do an empirical formula?

Answer 6

% (or mass depending on question)
÷ Ar
÷ smallest
ratio

eg.
A hydrocarbon is made of 85.7% carbon, find its empirical formula:

% C= 85.7, H=14.3
÷ Ar - C= 85.7 / 12 = 7.1417, H= 14.3/1 = 14.3
÷ smallest - C= 7.1417 / 7.1417 = 1, H = 14.3/7.1417 = 2
ratio - CH2

Question 7

How do you do a molecular formula?

Answer 7

Do the empirical formula first
(Mr given / Mr of the empirical compound) * the numbers of the compound
eg.
Empirical is CH2, Mr given is 42.
42 / 14 (C is 12 and H2 is 2) = 3
CH2 * 3 = C3H6