Question

write down the equation for the chemical reaction familiar to you and try to balance them​

Answer 1

Answer:

Solution  

a. Calcium reacts with water less vigorously to form calcium hydroxide and hydrogen gas.

b. Calcium starts floating in water as it becomes lighter due to the bubbles of hydrogen gas sticking to its surface.  

Ca  

(s)

+2H  

2

O(s)→Ca(OH)  

2(aq)

+H  

2(g)

↑+small amount of heat energy