Task 9.18
Lithium is
stored under (oil/water) to stop it reacting with (nitrogen/oxygen).
Lithium is (soft/hard) and can (just/not) be cut with a knife.
When cut its surface is (dull/shiny) but is slowly changes when exposed
to the air. On
water lithium (floats/sinks) because it has a (higher/lower) density than water.
Lithium moves around (slowly/vigorously) on the surface (fizzing/in
silence) because a gas called (oxygen/hydrogen) is formed.
The solution left behind turn universal indicator (red/blue).
Lithium hydroxide is formed which is an (alkali/acid). The word
equation is ________ + water --> lithium hydroxide + hydrogen
The balanced equation is:
_____________ + 2H2O(l) --> 2LiOH(aq) + H2(g)
Sodium is
stored under (oil/water) to stop it reacting with (nitrogen/oxygen).
Sodium is (soft/hard) and can (easily/not) be cut with a knife.
When cut its surface is (dull/shiny) but is quickly changes when exposed
to the air. On
water sodium (floats/sinks) because it has a (higher/lower) density than water.
Lithium moves around (quickly/vigorously) on the surface (fizzing/in
silence) because a gas called (oxygen/hydrogen) is formed.
The sodium may burn with a (yellow/green) flame. The solution left behind
turn universal indicator (red/blue).
Sodium hydroxide is formed which is an (alkali/acid). The word
equation is:
sodium + _____________ --> sodium hydroxide + hydrogen
The balanced equation is:
2Na(s) + ____________ --> 2NaOH(aq) + H2(g)
Potassium
is stored under (oil/water) to stop it reacting with (nitrogen/oxygen).
Potassium is (very soft/hard) and can (very easily/not) be cut with a
knife. When
cut its surface is (dull/shiny) but is very quickly changes when exposed to the
air. On
water potassium (floats/sinks) because it has a (higher/lower) density than
water. Potassium
moves around (slowly/vigorously) on the surface (fizzing/in silence) because a
gas called (oxygen/hydrogen) is formed.
The potassium burns with a (lilac/green) flame.
The solution left behind turn universal indicator (red/blue).
Potassium hydroxide is formed which is an (alkali/acid). The word
equation is: potassium + water --> _____________ + ____________
The balanced equation is:
2K(s) + 2H2O(l) --> _______________ +
_________________