Reactants are the substance that undergo a change in a chemical reaction while products are what is produced after a reaction. don't have time to write a reaction.
I am only in 6th grade so all I have to say is good luck and I wish you the best on that quiz.
Answer:
4 significant digits
Explanation:
Zeroes placed between other digits are always significant
answer a) the existence of isomers is a reason for the large number of carbon compounds
