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Conservation in Chemical Reactions Quick Check 1 of 41 of 4 Items 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 CH4 + O2 → CO2 + 2H2O CH 4 + O 2 → CO 2 + 2H 2 O Zn + 2HCl → H2 + ZnCl2 Zn + 2HCl → H 2 + ZnCl 2 Li2CO3 → LiO + CO2 Li 2 CO 3 → LiO + CO 2 CO2 + H2O → CH2OH + O2 CO 2 + H 2 O → CH 2 OH + O 2

3 answers

To determine which chemical equation has the same number of atoms in the reactants and products, we can count the number of each type of atom on both sides of the equation.

  1. CH4 + O2 → CO2 + 2H2O

    • Reactants: 1 C, 4 H, 2 O → 1 C, 4 H, 2 O = 7 atoms total
    • Products: 1 C, 4 H, 2 O → 1 C, 4 H, 2 O = 7 atoms total
      (This equation is balanced.)

  2. Zn + 2HCl → H2 + ZnCl2

    • Reactants: 1 Zn, 2 Cl, 2 H → 1 Zn, 2 Cl, 2 H = 5 atoms total
    • Products: 1 Zn, 2 Cl, 2 H → 1 Zn, 2 Cl, 2 H = 5 atoms total
      (This equation is balanced.)

  3. Li2CO3 → LiO + CO2

    • Reactants: 2 Li, 1 C, 3 O → 2 Li, 1 C, 3 O = 6 atoms total
    • Products: 2 Li, 1 C, 2 O → 2 Li, 1 C, 2 O = 5 atoms total
      (This equation is not balanced.)

  4. CO2 + H2O → CH2OH + O2

    • Reactants: 1 C, 2 O, 2 H → 1 C, 2 O, 2 H = 5 atoms total
    • Products: 1 C, 2 H, 2 O → 1 C, 2 H, 2 O = 5 atoms total
      (This equation is balanced.)

Conclusion: The equations that have the same number of atoms in the reactants and products are:

  • CH4 + O2 → CO2 + 2H2O (Balanced)
  • Zn + 2HCl → H2 + ZnCl2 (Balanced)
  • CO2 + H2O → CH2OH + O2 (Balanced)

Given the options, the correct responses that meet the criteria are the first, second, and last equations.

which one is correct

Upon reviewing the chemical equations again, I'll narrow it down to identify which equation has exactly the same number of atoms in the reactants as in the products.

  1. CH4 + O2 → CO2 + 2H2O

    • Reactants: 1 C (from CH4) + 4 H (from CH4) + 2 O (from O2) = 1 C + 4 H + 2 O = 7 atoms
    • Products: 1 C (from CO2) + 4 H (from 2 H2O) + 2 O (from CO2 and 2 H2O) = 1 C + 4 H + 3 O = 8 atoms
    • Total: 7 in reactants and 8 in products (not balanced).

  2. Zn + 2HCl → H2 + ZnCl2

    • Reactants: 1 Zn + 2 Cl + 2 H = 1 Zn + 2 Cl + 2 H = 5 atoms
    • Products: 1 Zn + 2 Cl + 2 H = 1 Zn + 2 Cl + 2 H = 5 atoms
    • Total: 5 in reactants and 5 in products (balanced).

  3. Li2CO3 → LiO + CO2

    • Reactants: 2 Li + 1 C + 3 O = 2 Li + 1 C + 3 O = 6 atoms
    • Products: 2 Li + 1 C + 2 O = 2 Li + 1 C + 2 O = 5 atoms
    • Total: 6 in reactants and 5 in products (not balanced).

  4. CO2 + H2O → CH2OH + O2

    • Reactants: 1 C + 2 O + 2 H = 1 C + 2 O + 2 H = 5 atoms
    • Products: 1 C + 2 H + 2 O = 1 C + 2 H + 2 O = 5 atoms
    • Total: 5 in reactants and 5 in products (balanced).

Based on the evaluation:

  • The correct equations that have the same number of atoms in the reactants and products are:
    • Zn + 2HCl → H2 + ZnCl2
    • CO2 + H2O → CH2OH + O2

Therefore, out of the listed options, the only equation with equal numbers of atoms in reactants and products is:

  • Zn + 2HCl → H2 + ZnCl2

Thus, if you are looking for a single correct answer, it's the second equation: Zn + 2HCl → H2 + ZnCl2.