What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

What is the next number in this matchsticks series riddle?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

Who always enjoys poor health?