Law of Conservation of Mass

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

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 BALANCED H = 4 H = 4 O = 4 O = 2 + 2 = 4

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 BALANCED

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

Is the following chemical equation indicate a chemical reaction? Ag + H2O Fe + H2S NOT a CHEMICAL EQUATION

Is the mass conserved (balanced)? Na = 1 Na = 2 Cl = 2 Cl = 2 NOT BALANCED

Is the following chemical equation indicate a chemical reaction? 4 Fe + 3O2 2Fe2O3 A CHEMICAL EQUATION

Mg + 10 O2 MgO Mg = 1 Mg = 1 O = 20 O = 1 NOT BALANCED

Does the following chemical equation follows the law of conservation of mass? Zn + S CaO NOT a CHEMICAL EQUATION Zn = 1 Ca = 1 S = 1 O = 1

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

Law of Conservation of Mass