Question

1. The underlined portion of the chemical formula above is the _____ and it represents ____________________.

A.coefficient; how many Hydrogen atoms there are in one molecule

B.subscript; how many Hydrogen atoms there are in one molecule

C.coefficient; how many water molecules there are

D.subscript; how many water molecules there are




2. Is 2H2 +O2 -> 2H2O.a balanced chemical equation? Is it obeying the law of conservation of matter?


A.Yes, the equation is balanced.  There are the same number of Hydrogen (H) and Oxygen (O) atoms on both sides of the equation.

B.No, the equation is not balanced.  The Hydrogen (H) in the equation has less atoms represented on the products.

C.No, the equation is not balanced.  The Oxygen (O) in the equation has less atoms represented on the products.

Answer 1

1. The correct answer is B. Subscript; how many hydrogen molecules which are there in that one molecule.

Chemical formula above is a superscript and it represents hydrogen molecules in one molecule.

2. The correct answer is C. No, the equation is not balanced. In the equation the oxygen it has less atoms which represents the products.