⚡ Show all working — the AI marks against the AQA mark scheme. Method marks awarded for correct working even if the final answer is wrong.
1 markGroup 1 trendAQA 8462 style
Why does reactivity increase going down Group 1?
A The atoms get larger so there are more electrons to react with
B The outer electron is further from the nucleus and more shielded, so less energy is needed to remove it
C The atoms become lighter going down the group
D The ionic radius decreases going down the group
3 marksReaction with waterAQA 8462 style
Write a word equation for the reaction of potassium with water. Describe what you would observe during this reaction. (3 marks)
Hint: Word equation: metal + water → metal hydroxide + hydrogen. Observations should describe what you SEE: movement, flame colour, disappearance.
+30 XP
1 markWhy stored in oilAQA 8462 style
Why are Group 1 metals stored under oil?
A To stop them from rusting (forming iron oxide)
B To prevent them reacting with oxygen and water vapour in the air
C To keep them at a constant temperature
D To prevent them from dissolving in each other
3 marksPredict rubidium reactionAQA 8462 style
Rubidium (Rb) is below potassium in Group 1. Predict how rubidium would react with water compared to potassium, and write a word equation for the reaction. (3 marks)
Hint: Use the trend: going down Group 1, reactivity increases. Predict: more vigorous, faster, more likely to ignite. Word equation follows the same pattern as Li/Na/K.