What does below chemistry rebus means?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Why did the Girl throw the butter out of the window?

What can you hold in your right hand, but never in your left hand?

👉 I am a 7 letter word.
👉 I like mornings
👉 If you remove my 1st letter you can drink me
👉 If you remove my 1st & 2nd letters 👉 you may not like me
👉 If you remove my last letter, you will see me on television
👉Answer is really very interesting
Let us see who solves this....

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

How far can you walk into the woods?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?