In which chemical equation is the number of atoms in
the reactants the same as the number of atoms in the
products? (1 point)
Zn + 2HCl → H + ZnCl 2 2
CO2 + H2O → CH2OH + O2
Li2CO3 → LiO + CO2
CH4 + O2 → CO2 + 2H2O
The chemical equation in which the number of atoms in the reactants is the same as the number of atoms in the products is:
CH4 + O2 → CO2 + 2H2O
To determine which chemical equation has the same number of atoms in the reactants as in the products, we need to count the number of atoms on both sides of the equation.
Let's go through each chemical equation:
1. Zn + 2HCl → H + ZnCl2
In this equation, there are 1 Zinc (Zn) atom and 2 Chlorine (Cl) atoms on the reactant side. On the product side, there is 1 Hydrogen (H) atom and 1 Zinc Chloride (ZnCl2) molecule, which consists of 1 Zinc (Zn) atom and 2 Chlorine (Cl) atoms. As a result, the number of atoms is not the same on both sides.
2. CO2 + H2O → CH2OH + O2
In this equation, there are 1 Carbon (C) atom and 2 Oxygen (O) atoms in the reactants. On the product side, we have 1 Carbon (C) atom, 4 Hydrogen (H) atoms, and 3 Oxygen (O) atoms. Therefore, the number of atoms is not the same on both sides.
3. Li2CO3 → LiO + CO2
In this equation, there are 2 Lithium (Li) atoms, 1 Carbon (C) atom, and 3 Oxygen (O) atoms in the reactant. On the product side, we have 1 Lithium Oxide (LiO) molecule, consisting of 1 Lithium (Li) atom and 1 Oxygen (O) atom, and 1 Carbon Dioxide (CO2) molecule, which contains 1 Carbon (C) atom and 2 Oxygen (O) atoms. Therefore, the number of atoms is not the same on both sides.
4. CH4 + O2 → CO2 + 2H2O
In this equation, there are 1 Carbon (C) atom and 4 Hydrogen (H) atoms in the reactants. On the product side, we have 1 Carbon Dioxide (CO2) molecule, containing 1 Carbon (C) atom and 2 Oxygen (O) atoms, and 2 Water (H2O) molecules, which consists of 4 Hydrogen (H) atoms and 2 Oxygen (O) atoms. In this case, the number of atoms is the same on both sides, making this equation the correct answer.
Therefore, the chemical equation in which the number of atoms in the reactants is the same as the number of atoms in the products is:
CH4 + O2 → CO2 + 2H2O
The chemical equation in which the number of atoms in the reactants is the same as the number of atoms in the products is the equation:
CH4 + O2 → CO2 + 2H2O