1a1 mark
Rubidium, Rb, is a Group I element. It has similar physical and chemical properties to the other elements in Group I.
Predict how many electrons there are in the outer shell of a rubidium atom.
1b1 mark
Predict one physical property of rubidium which is the same as that of a transition element such as iron.
1c2 marks
Predict two physical properties of rubidium which are different to those of a transition element such as iron.
1d7 marks
When rubidium is added to cold water a reaction occurs.
i)
Suggest two observations that would be made when rubidium is added to cold water.
[2]
ii)
What would be the colour of the solution if methyl orange was added to it after the reaction?
[1]
iii)
Write a chemical equation for the reaction between rubidium and water.
[2]
iv)
Put the Group I elements, caesium, lithium, potassium, rubidium and sodium in their order of reactivity with water, from the most reactive to the least reactive.
[1]
v)
Suggest one safety measure that should be used when rubidium is added to cold water.
[1]
1e1 mark
The phosphate ion has the formula PO43–.
Deduce the formula of rubidium phosphate.
Did this page help you?
