What does below chemistry rebus means?

John gave half of the apples he had plus one more to Jacob. He gave half of the remaining ones plus one more to James. Now, John was left with just one apple.

Can you find out how many did he have in the beginning?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

What has a bottom at the top?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

I am something people love or hate. I change peoples appearances and thoughts. If a person takes care of them self I will go up even higher. To some people I will fool them. To others I am a mystery. Some people might want to try and hide me but I will show. No matter how hard people try I will Never go down. What am I?

How many Watermelons are there in the below picture?

Jenifer is learning to drive her car. She went down a one way lane and in the wrong direction. But she do not break any law.

How come ?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?