Caesium, lithium potassium and sodium are all in Group of
the Periodic Table
(a) Place these metals in order of reactivity starting with the
most reactive.
(b) All Group 1 elements react in the same manner with
water.
(i) Name the chemical products of the reaction
between caesium and water.
(ii) Write a balanced chemical equation for the
reaction of caesium with water. Include state
symbols.
(iii) What three things would you expect to see if small
pieces of caesium were dropped in water in a glass
trough?
(C) What is the other name for Group 1 elements.

(a) In ascending order of reactivity:

1. Cesium(Cs)

2. Potassium(K)

3. Lithium(Li)

(b) (i) Reaction of Cesium with water produces:

Colorless basic solution of Cesium hydroxide and hydrogen gas.

(ii) Cesium+Water—>Cesium Hydroxide+Hydrogen

•2Cs + 2H²O —> 2CsOH + H²

(iii) a) toxic and violent reaction

b) catch fire

c) release of a large amount of hydrogen gas

(c) Alkali Metals

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.