Unit 8 Test Review

Which branch of chemistry deals with the mass relationships of elements in compounds and the mass relationships among reactants and products in chemical reactions?

• qualitative analysis

• entropy

• chemical kinetics

• stoichiometry

A balanced chemical equation allows one to determine the

• mole ratio of any two substances in the reaction.

• energy released in the reaction.

• electron configuration of all elements in the reaction.

• mechanism involved in the reaction.

The coefficients in a chemical equation represent the

• masses, in grams, of all reactants and products.

• relative numbers of moles of reactants and products.

• number of atoms in each compound in a reaction.

• number of valence electrons involved in the reaction.

In the chemical reaction wA + xB ® yC + zD, a comparison of the number of moles of A to the number of moles of C would be a(n)

• mass ratio.

• mole ratio.

• electron ratio.

• energy proportion.

In the reaction N2 + 3H2 --> 2NH3, what is the mole ratio of nitrogen to ammonia?

• 1:1

• 1:2

• 1:3

• 2:3

In the reaction 2Al2O3 --> 4Al + 3O2, what is the mole ratio of aluminum to oxygen?

• 10:6

• 3:4

• 2:3

• 4:3

In the reaction 2H2 + O2 --> 2H2O, what is the mole ratio of oxygen to water?

• 1:2

• 2:1

• 8:1

• 1:4

In the reaction Ca + Cl2 --> CaCl2, what is the mole ratio of chlorine to calcium chloride?

• 2:3

• 2:1

• 1:2

• 1:1

In the reaction Zn + H2SO4 --> ZnSO4 + H2, what is the mole ratio of zinc to sulfuric acid?

• 1:6

• 1:1

• 1:2

• 3:1

In the reaction C + 2H2 --> CH4, what is the mole ratio of hydrogen to methane?

• 1:1

• 2:1

• 1:2

• 2:4