Chemical Equations and Mass Conservation

The chemical equations presented depict reactions involving various substances, with focus on whether mass conservation principles are observed. Understanding the balance in mass transformation during reactions is essential in chemistry.

• Chemistry
• Mass Conservation
• Chemical Equations
• Reactions

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Uploaded on Mar 04, 2025 | 0 Views

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Presentation Transcript

1. Law of Conservation of Mass Is the mass of the following equations conserved (balanced) or not? Explain.

2. The following chemical equation shows the decomposition of hydrogen peroxide into water and oxygen. When yeast is added to the peroxide, the decomposition speeds up by the yeast acting as a catalyst. 2H2O2 2H2O + O2 H = 4 H = 4 O = 4 O = 2 + 2 = 4

3. Acetic acid (vinegar) reacts with sodium bicarbonate (baking soda) and produces sodium acetate, water, and carbon dioxide. CH3COOH + NaHCO3 CH3COONa + H2O + CO2 C = 3 C = 3 H = 5 H = 5 O = 5 O = 5 Na = 1 Na = 1

4. Is the mass conserved (balanced)? K = 2 K = 2 Br = 2 Br = 2

5. Is the following chemical equation indicate a chemical reaction? Ag + H2O Fe + H2S

6. Is the mass conserved (balanced)? Na = 1 Na = 2 Cl = 2 Cl = 2

7. Is the following chemical equation indicate a chemical reaction? 4 Fe + 3O2 2Fe2O3

8. Mg + 10 O2 MgO Mg = 1 Mg = 1 O = 20 O = 1

9. Does the following chemical equation follows the law of conservation of mass? Zn + S CaO Zn = 1 S = 1 Ca = 1 O = 1

10. Does the following chemical equation follows the law of conservation of mass? Mg + Cl2 2MgCl Mg = 1 Mg = 2 Cl = 2 Cl = 2