What does below chemistry rebus means?

I know a nine-letter word having only one vowel.
Do you ?

What does below Rebus mean ?

esgg sgeg gegs gsge

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

what's the probability of getting a king or a queen from a pack of 52 cards?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

I have no life, but I can die. What am I?

What has no start, end, or centre?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?