Balancing Chemical Equations Answers

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One half of a balanced chemical equation is shown.3Mg(OH)2 + 2H3PO4Which lists the numbers of each atom the other half of the equation would contain?

3 Mg, 2 P, 14 O, 12 H

Mg, 2 P, 14 O, 6 H

3 Mg, 8 P, 7 O, 6 H

6 Mg, 6 P, 2 O, 12 H

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If the mass of the products measured 120 g, what would be the mass of the reactants?

30 g

60 g

120 g

240 g

Lana balanced an equation so that the result was 2C2H3Br + 5O2 → 4CO2 + 2H2O + 2HBr. Which most likely represents the starting equation?

2C4H3Br + 5O2 → 4CO2 + 2H2O + 2HBr

C2H3Br + 5O2 → 4CO2 + H2O + 2HBr

C4H3Br + O2 → CO2 + H2O + HBr

C2H3Br + O2 → CO2 + H2O + HBr

Which best describes the law of conservation of mass?

The coefficients in front of the chemicals in the reactants should be based on the physical state of the products.

Products in the form of gases are not considered a part of the total mass change from reactants to products.

When reactants contain both a solid and a liquid, the solid counts toward the overall mass and the liquid does not.

The mass of the reactants and products is equal and is not dependent on the physical state of the substances.

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