Question

What prediction can you make about softness of potassium and vigor of its reaction with water?

Answer 1

Chemical properties of the alkali metals

Atoms of group 1 elements all have one electron in their outer shell. This means that the alkali metals all have similar chemical properties.

Reactions with water

The alkali metals react with water to produce a metal hydroxide and hydrogen. For example, sodium reacts with water:

Sodium + water → sodium hydroxide + hydrogen

2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

Sodium hydroxide is an alkali. It is a base that dissolves in water to form an alkaline solution. This solution:

has a pH greater than 7

turns universal indicator solution blue or purple

Hydrogen gas is also produced. With very reactive metals such as potassium, the energy of the reaction causes the hydrogen to burn as the reaction takes place.

Step-by-step explanation:

Answer 2

potassium reacts rigorously with cold water. potassium is a soft metal. we can predict that potassium is a highly reactive metal.

Step-by-step explanation:

hope this helps