What does below chemistry rebus means?

What is the end of everything?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

What four weights can be used to balance from 1 to 30 pounds?

Can you solve the below geography rebus by decoding the below rebus ?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?