What does below chemistry rebus means?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

The more it dries, the wetter it becomes. Can you tell what it is?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Four children having five rocks each were playing a game in which they had to throw the rock at a particular solid area in the water. Child 1- Succeeded in throwing three rocks at a solid area but one of the rocks sunk. Child 3 - His aim was so bad that all rocks got sunk. Child 4- He was awesome and none of the rocks got sunk. Child 2 - Was the winner but was struck by a rock in the head and died. Who killed Child 2?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?