In which chemical equation is the number of atoms in the reactants the same as the number of atoms in the products?
Li2CO3 → LiO + CO2
Zn + 2HCl → H2 + ZnCl2
CO2 + H2O → CH2OH + O2
CH4 + O2 → CO2 + 2H2O
The correct answer is:
CH4 + O2 → CO2 + 2H2O
Which statement is true regarding a chemical reaction?
A. The total number of atoms does not change, so mass is conserved in the reaction.
B. Even if the total number of atoms does not change, mass may not be conserved in the reaction.
C. Even if the total number of atoms changes, mass may not be conserved in the reaction.
D. The total number of atoms changes, so mass is conserved in the reaction.
The correct statement is:
A. The total number of atoms does not change, so mass is conserved in the reaction.
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?
A. 228 amu
B. 152 amu
C. 38 amu
D. 76 amu