Answers AA-F26 Physical ScienceBalancing Chemical Equations

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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Which equation is balanced?

Mg3N2 + H2O 3MgO + 2NH3

C3H8 + 5O2 H2O + 3CO2

Zn + 2HCl ZnCl2 + H2

3H2SO4 + 2Fe Fe2(SO4)3 + H2

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.

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

The equation below is for potassium oxide. 4K + O2 2K2O What is the ratio of atoms of potassium to atoms of oxygen?

1:2

2:1

4:1

1:4

Akia is balancing the equation Na + H2O NaOH + H2. He tries to find the coefficients that will balance the equation.How could he find the correct coefficients?

by counting each individual atom and making sure the number of each kind of atom is the same in the reactants and the products

by counting the total atoms and making sure the number of atoms in the reactants is the same as the number of atoms in the products

by counting the total mass of each compound and making sure the reactants have more mass than the products

by counting the mass of each atom and making sure the reactants are more massive than the products

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Balancing Chemical Equations Answers

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