Alkali metals

Question 1

What group are alkali metals in?

Answer 1

1

Question 2

What charge is on a ion of an alkali metal?

Answer 2

+1

Question 3

Are alkali metal more reactive up or down the group?

Answer 3

Alkali metals become more reactive as you go down the group

Question 4

What must alkali metals be stored under?

Answer 4

Oil

Question 5

Whan an alkali metal reacts with water what two products are formed?

Answer 5

A metal hydroxide and hydrogen

e.g.

sodium and water ——> sodium hydroxide and hydrogen

Na + H₂O ———–> NaOH + H₂

Question 6

What is the pH of the solution formed when an alkali metal reacts with water?

Answer 6

greater than 7 (alkali) - blue/purple

Question 7

When an alkali reacts with oxygen what product is formed

Answer 7

A metal oxide

e.g.

lithium and oxygen ——> lithium oxide

Li + O₂ —> Li₂O

Question 8

Describe the reaction of lithium (Li) with water

Answer 8

Floats, moves around the surface, hydrogen gas released

Question 9

Describe the reaction of with potassium (K) with water

Answer 9

Floats, rapidly moves around the surface, hydrogen gas released catches fire

Question 10

How do you test for hydrogen gas?

Answer 10

Squeaky pop test

Question 11

What are the properties of alkali metals?

Answer 11

Soft (cut with a knife), dull (shiny when cut), low density

Question 12

What is oxidation?

Answer 12

Addition of oxygen or loss of electrons

Remember:

OIL RIG

Oxidation is loss of electrons

Reduction is gain of electrons