Which of the following chemical equations shows the Law of Conservation of Mass?(1 point)

Question

Responses

H2O+O2→H2O2
N2+H2→NH3
P+O2→P2O5
K+MgBR→KBR+Mg

Answer 1

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. This means that the total number of atoms on the reactant side of the equation must equal the total number of atoms on the product side.

Let's analyze the given equations:

1. H2O + O2 → H2O2

   • Reactants: 2 H (from H2O) + 2 O (from O2) = 2 H + 2 O
   • Products: 2 H + 2 O (from H2O2)
   • This equation conserves mass.

2. N2 + H2 → NH3

   • Reactants: 2 N (from N2) + 2 H (from H2) = 2 N + 4 H
   • Products: 1 N + 3 H (from NH3) = 1 N + 3 H
   • This equation does not conserve mass (we have different numbers of atoms on both sides).

3. P + O2 → P2O5

   • Reactants: 1 P + 2 O = 2 P + 2 O
   • Products: 2 P (from P2O5) + 5 O = 2 P + 5 O
   • This equation does not conserve mass.

4. K + MgBr → KBr + Mg

   • Reactants: 1 K + 1 Mg + 1 Br = 1 K + 1 Mg + 1 Br
   • Products: 1 K + 1 Br + 1 Mg = 1 K + 1 Br + 1 Mg
   • This equation conserves mass.

So, based on the analysis, the equations that show the Law of Conservation of Mass are:

1. H2O + O2 → H2O2
2. K + MgBr → KBr + Mg

If you are to choose only one option, the most straightforward one showing conservation without reacting species being mixed would be H2O + O2 → H2O2.

Answer 2

wrong

Answer 3

I apologize for any confusion in my previous response. Let's analyze the equations carefully again based on the Law of Conservation of Mass, which states that the number of atoms must be the same on both sides of the reaction.

1. H2O + O2 → H2O2

   • Reactants: 2 H + 2 O
   • Products: 2 H + 2 O
   • This equation is balanced. (Conserves mass)

2. N2 + H2 → NH3

   • Reactants: 2 N + 2 H
   • Products: 1 N + 3 H
   • Not balanced; does not conserve mass.

3. P + O2 → P2O5

   • Reactants: 1 P + 2 O
   • Products: 2 P + 5 O
   • Not balanced; does not conserve mass.

4. K + MgBr → KBr + Mg

   • Reactants: 1 K + 1 Mg + 1 Br
   • Products: 1 K + 1 Br + 1 Mg
   • This equation is balanced. (Conserves mass)

Both Option 1 (H2O + O2 → H2O2) and Option 4 (K + MgBr → KBr + Mg) actually maintain the conservation of mass.

If you were looking for a single best choice among these, then I would say Option 2 (N2 + H2 → NH3) is indeed the equation that does not show conservation of mass.

Thank you for your patience, and I appreciate your guidance! If you need further clarification, feel free to ask.