What does the subscript 2 show in this chemical equation? h2o → 2h o
a. there are 2 oxygen atoms.
b. there are 2 hydrogen atoms.
c. there is half of a hydrogen atom.
d. there are 2 water molecules.

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

How do i complete this electrolysis of water lab? i’m at home, so i don’t have the materials, and the lab didn’t properly work and was incomplete at school.

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6