Question

Chemical equation for the following:
1. Mg with steam
2. Al with steam
3. Ca with cold water

Answer 1

Answer:

Potassium, sodium and calcium are very reactive. They displace hydrogen from cold water. Whereas Mg can displace hydrogen when the water is boiling or it is in the form of steam. 

Mg(s)+H2O(g)→MgO(s)+H2O(g)

Answer 2

Explaination:-

1- Mg(s)+2H2(this2 is in subscript)O(g)---->Mg(OH)2(this2 is in subscribt) (aq)+ H2(this2 is in subscribt)(g) .