1.1. Potassium reacts with water to produce potassium hydroxide and hydrogen gas.

2K + 2H₂O  → 2KOH + H₂

i) Complete the table. Tick (✓) one box in each of the last two rows.                      

[2]

ii) During the reaction, potassium burns with a lilac flame.

Give two other observations that you would expect to make.

Choose your answers from the box.                                                                     

[2]

Observation 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Observation 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2. Potassium also reacts with oxygen to produce potassium oxide.

$□$K + O₂ → 2K₂O

Choose a number from the box to balance the equation for this reaction.

1.3. Most Group 1 and Group 2 metals can be identified by the colour seen in a flame test.

Draw one line from each metal to the colour seen.

One line has been drawn for you.