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The following equations represent chemical reactions. Chemical Reactions

1. 2Na + 2H₂O →NAOH + H₂
2. H₂ + O₂ → H₂O
3. Mg + Cl₂ → MgCl₂
4. NaOH + MgCl2 → NaCl + M9OH


Which equation shows that the total mass during a chemical reaction stays the same? A. 1
В. 2
С. 3
D. 4

User X Slash
by
8.7k points

1 Answer

5 votes

Final answer:

Both B. H₂ + O₂ → H₂O and C. Mg + Cl₂ → MgCl₂ correctly demonstrate the conservation of mass in a chemical reaction because they are balanced, showing equal numbers of each type of atom on both sides of the equation.

Step-by-step explanation:

The question you've asked is about the conservation of mass in chemical reactions, specifically which of the provided equations demonstrates that the total mass during a chemical reaction stays the same. By the Law of Conservation of Mass, the mass of the reactants must equal the mass of the products in a chemical reaction.

Looking at the given equations:

2Na + 2H₂O → NAOH + H₂ is not correct; it is a typo and not a balanced reaction.

H₂ + O₂ → H₂O is balanced and shows the conservation of mass.

Mg + Cl₂ → MgCl₂ is balanced and conserves mass.

NaOH + MgCl2 → NaCl + M9OH has a typo and 'M9OH' should be 'Mg(OH)₂'; also, the equation is not balanced.

Correct Answer: B. H₂ + O₂ → H₂O and C. Mg + Cl₂ → MgCl₂ both demonstrate that the total mass during a chemical reaction stays the same as they are balanced chemical equations.

User Maayan Glikser
by
8.3k points
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