S - Reaction With Oxygen

Question 1

Group 1

Answer 1

All very reactive
Have to be stored out of contact with air

Question 2

Group 1

Why do they have to be stored?

Answer 2

To prevent their oxidation

Question 3

Group 1

How are they stored?

Answer 3

Oil:
Lithium, sodium and potassium

Sealed glass tubes:
Rubidium, caesium
(Vacuum or inert atmosphere e.g Argon)

Question 4

Group 1

Equation
X = any group 1

Answer 4

4X + O(v)2 —> 2X(v)2O

Question 5

Group 2

Equation
X = any group 2

Answer 5

2X + O(v) —> 2XO

Question 6

Summary

Answer 6

Metal + oxygen gives a metal oxide

Question 7

Flame test

What is it? Why is it done?

Answer 7

These are the colours of the compounds of group 1 and 2

The colours can be used to identify the element present

Question 8

Compound containing the ion;

Lithium

Flame test colour:

Answer 8

Deep red

Question 9

Compound containing the ion;

Sodium

Flame test colour:

Answer 9

Yellow/orange

Question 10

Compound containing the ion;

Potassium

Flame test colour:

Answer 10

Lilac

Question 11

Compound containing the ion;

Magnesium

Flame test colour:

Answer 11

Colourless

Question 12

Compound containing the ion;

Calcium

Flame test colour:

Answer 12

Brick red

Question 13

Compound containing the ion;

Strontium

Flame test colour:

Answer 13

Crimson

Question 14

Compound containing the ion;

Barium

Flame test colour:

Answer 14

Apple green