What does below chemistry rebus means?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

At the local model boat club, four friends were talking about their boats.

There were a total of eight boats, two in each colour, red, green, blue and yellow. Each friend owned two boats. No friend had two boats of the same colour.

Alan didn't have a yellow boat. Brian didn't have a red boat but did have a green one. One of the friends had a yellow boat and a blue boat and another friend had a green boat and a blue boat. Charles had a yellow boat. Darren had a blue boat, but didn't have a green one.

Can you work out which friend had which coloured boats?

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

John was drowned by he was not wet. How?

Can you replace the question mark with the correct number in the below table sequence?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?