Alkali Metals

Question 1

Properties?

Answer 1

Low density (float on water)
Soft (can cut with knife)
Shiny when cut recently (quickly oxidise)

Question 2

Observations for metal chlorides

Answer 2

White solid/salt
Reaction is very vigourus (lot of bright light and heat produced)
Dissolve in water/colourless solutions

Question 3

Observation of metal hydroxides (with water)

Answer 3

Very vigourus
Fizzing/bubbles
Floats and moves
Metal dissolves eventually

Question 4

What happens when lithium and water react (symbol equation)

Answer 4

2Li + 2H*2O - > 2LiOH + H2

Question 5

Observations of metal oxide?

Answer 5

Room temperature
Colour change from shiny grey to dull white
If heated they burn vigourusly forming a white smoke (the metal oxide)

Question 6

What can group 1 oxides do?

Answer 6

Dissolve in water to form metal hydroxide which are alkaline

Question 7

What is the colour of an alkaline solution?

Answer 7

Purple

Question 8

How can you prevent oxygen from reacting with a metal

Answer 8

Put the metal in oil