A small piece of potassium is added to a trough of water containing a few drops of phenolphthalein indicator. Only four of the following statements correctly describe what happens during this reaction. Identify the four correct statements from this list:

1. The metal sinks to the bottom of the trough before reacting.
2. Hydrogen gas is evolved during the reaction.
3. A lilac flame is observed as the metal reacts.
4. The reaction is less vigorous than the reaction of lithium with water.
5. The metal floats and moves rapidly across the surface of the water.
6. Oxygen gas is produced which relights a glowing splint.
7. The resulting solution turns phenolphthalein indicator pink.
8. An acidic solution of potassium oxide is formed.