What does below chemistry rebus means?

Who is generally closer to the kids, mom or dad?

(it's a funny riddle)

What has 13 hearts but no other organs?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

what one word does the below rebus identifies?

What does the below rebus puzzle mean?

The more you take me, the more you leave me behind.
Who Am I?