experiment

Question 1

Variables

Answer 1

Manipulated - Different type of alkali metals
Responding - Reactivity of metals
Fixed - water size of emtals

Question 2

Appartus

Answer 2

Water throughs
Small knife
Forceps

Question 3

Materials

Answer 3

Small pieces of lithium sodium and potassium
Filter paper
Litmus paper

Question 4

Procedure

Answer 4

Cut lithium into small pieces using a knife and forceps. Dry a piece of the metal on a filter paper.
Put the piece of lithium slowly into a basin filled with water
When the reaction is complete, test the solution with a red litmus paper
Record your observations in a table
Repeat steps 1 to 4 with sodium and potassium.

Question 5

Observation lithium

Answer 5

Lithium melts and moves slowly at random on surface
Plenty of fizz
Colourless solution turns red litmus paper blue

Question 5

Observation lithium

Answer 5

Lithium melts and moves slowly at random on surface
Plenty of fizz
Colourless solution turns red litmus paper blue

Question 6

Observation Sodium

Answer 6

Melts and move rapidly at random on surface
Hissing sound
Colourless solution turns red litmus paper blue

Question 7

Observation potassium

Answer 7

Melts and moves very fast at random on surface
Ignites with lilac flame
Pop and hissing sounds
Colourless solution turns red litmus paper blue

Question 8

Discussion

Answer 8

Sodium potassium are very reactive and this experiment should be done with safety measures in place

Question 9

Reactions

Answer 9

2Li(s) + 2H2O(l)  2LiOH(aq) + H2(g)
2Na(s) + 2H2O(l)  2NaOH(aq) + H2(g)
2K(s) + 2H2O(l)  2KOH(aq) + H2(g)

Question 10

Conclusion

Answer 10

Lithium, sodium and potassium react with water to form metal hydroxide with alkaline properties

Arrangement of the alkali metals in increasing order of their reactivity is lithium, sodium and
potassium.