Question

Question
In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?(1 point)
Responses

Li2CO3 → LiO + CO2
Li 2 CO 3 → LiO + CO 2

CH4 + O2 → CO2 + 2H2O
CH 4 + O 2 → CO 2 + 2H 2 O

Zn + 2HCl → H2 + ZnCl2
Zn + 2HCl → H 2 + ZnCl 2

CO2 + H2O → CH2OH + O2
Answer
Which statement is true regarding a chemical reaction?(1 point)
Responses

Even if the total number of atoms does not change, mass may not be conserved in the reaction.
Even if the total number of atoms does not change, mass may not be conserved in the reaction.

The total number of atoms changes, so mass is conserved in the reaction.
The total number of atoms changes, so mass is conserved in the reaction.

The total number of atoms does not change, so mass is conserved in the reaction.
The total number of atoms does not change, so mass is conserved in the reaction.

Even if the total number of atoms changes, mass may not be conserved in the reaction.
Answer
Question
Use the equation and the table to answer the question.

FeCl3 + 3H2O → Fe(OH)3 + 3HCl

Element Mass of an Atom (amu)
Fe 56
Cl 35
H 1
O 16
Iron chloride and water react according to the equation shown. The table shows the atomic masses of the elements involved in the reaction. What is the total mass of the reactants?

(1 point)
Responses

179 amu
179 amu

161 amu
161 amu

108 amu
108 amu

215 amu
Answer
In a chemical reaction, two molecules with a total mass of 76 amu react to form a single molecule. What is the mass of the molecule that is formed?(1 point)
Responses

38 amu
38 amu

152 amu
152 amu

228 amu
228 amu

76 amu
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