Ca + 2H20 - Ca(OH)2 + H2
Elemental calcium reacts with water at room temperature to form calcium hydroxide and hydrogen gas as shown in
this equation. Sodium undergoes a similar reaction with H20. What would be the coefficient for sodium in a similar
reaction?

Iknow the answer is a but i don't know why

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al oxidizing agent = reducing agent =