Lithium, sodium and potassium are three metals in Group 1 of the Periodic Table.
A small piece of each metal is placed on water in separate large troughs. Complete the table by giving the correct metal (lithium, sodium or potassium) for each description.
| Observation during reaction with water | Metal |
|---|---|
| Burns with a distinctive lilac-coloured flame and reacts extremely vigorously | |
| Fizzes steadily on the surface, moving slowly and remaining solid throughout | |
| Melts into a shiny spherical droplet, fizzing rapidly and moving quickly across the surface |
Give the name and formula of the gas formed when lithium reacts with water.
Name:
Formula:
Give the name and formula of the compound formed when potassium reacts with water.
Name:
Formula:
Describe how you could use a chemical indicator to show that an alkaline solution is formed when sodium reacts with water. State the name of the indicator and the colour change observed.
