Periodic Table - Group 1

Question 1

What are the group 1 elements known as?

Answer 1

Alkali metals

Question 2

Lithium reaction with WATER

Answer 2

2Li (s) + H20 (l) —> 2LiOH (aq) + H2 (g)

• reasonably soft
• fizzes and floats

Question 3

Sodium reaction with WATER

Answer 3

2Na (s) + H20 (l) —> 2NaOH (aq) + H2 (g)

• fairly soft
• fizzes more and floats
• forms a ball

Question 4

Potassium reaction with WATER

Answer 4

2K (s) + H20 (l) —> 2KOH (aq) + H2 (g)

• lilac flame
• fizzes a LOT (and floats)

Question 5

when the alkali metals react with water what do they produce?

Answer 5

• hydrogen gas (=fizzing)

- metal hydroxide solution (=alkaline)

Question 6

Lithium reaction with OXYGEN

Answer 6

4Li (s) + O2 (g) —> 2Li2O (s)

-bright white

Question 7

Sodium reaction with OXYGEN

Answer 7

4Na (s) + O2 (g) —> 2Na2O (s)

-orange flame

Question 8

Potassium reaction with OXYGEN

Answer 8

4K (s) + O2 (g) —> 2K2O (s)

-purple flame

Question 9

Group 1 elements become __________ as you move down the group.

Answer 9

More reactive

Question 10

what can you use the trend in reactivity to do? (group 1 metals)

Answer 10

Predict how other group 1 metals will react.

eg. you could predict that caesium will react more vigorously than potassium with water- in fact it explodes!

Question 11

how many electrons do the alkali metals have in their outer shell?

Answer 11

ONE