C3

Question 1

What are hydro-carbons

Answer 1

A molecule and can only contain hydrogen and carbon

Question 2

How do you make crude oil useful?

Answer 2

It must be separated into fractions using fraction distillation

Question 3

What is fraction distillation?

Answer 3

Fraction distillation is used to seperate long chains of hydrocarbons into smaller ones to be used for other fuel sources

Question 4

What is a REDOX reaction?

Answer 4

• *red**uction
• *ox**idation

Oxidation adds more oxygen to become neutral
reduction reduces oxygen to become neutral

Question 5

O
I
L
R
I
G

Answer 5

Oxidation 
Is 
Loss of electrons
Reduction
Is
Gain of electrons

Question 6

What is a half equation?

Answer 6

This involves the transfer of electrons in order to make a neutral charge

Eg.

2Mg(s)+O2(g)=2MgO

Half equation:

Mg->Mg(+2)+2e(-)
|
|
> this creates a neutral charge

Question 7

What is an ionic compound?

Answer 7

They are made up of POSITIVE METAL ions and NEGATIVE METAL ions.

Because positive and negative attract strongly,
It takes alot of energy to seperate them

Question 8

What is electrolosis?

Answer 8

This separates ionic compounds

When an ionic compound is MOLTEN or

in SOLUTION the current causes the ionic compound

to SPLIT UP and form new substances

Question 9

Uses of electrolysis

Answer 9

Purifying copper

Plating metal with silver and gold

Making soap

Making chlorine , hydrogen and sodium hydroxide

Question 10

What happens during electrolysis?
(Hint)

R
E
D
C
A
T

Answer 10

The substance that the current passes

through and splits it up is called an

ELECTROLYTE

Negative ions go to positive electrode
Positive ions go to negative electrode

Anions (positive) < cathode (negative )

Cations (negative) < anode (positive)

Question 11

Reactivity series?
(Hint)

P
S
C
M
A
C
Z
I
L
H
C
S
G
P

Answer 11

Potassium 
Sodium
Calcium
Magnesium
Aluminium 

(Carbon)

Zinc
Iron
Lead

(Hydrogen)

Copper
Silver
Gold
Platinum