What scientific principle or law is used in the process of balancing chemical equations?

• Law of Definite Proportions

• Law of Conservation of Mass

• Law of Multiple Proportions

• Law of Conservation of Energy

Which of the following is NOT a type of chemical reaction described in the text?

• Combustion reactions

• Combination reactions

• Substitution reactions

• Decomposition reactions

What is Avogadro’s number, and how is it related to the mole?

• 6.02 x 10^23, it is the number of atoms in one mole of a substance

• 3.14, it is the value of pi in chemistry

• 9.81, it is the acceleration due to gravity in chemistry

• 2.718, it is the base of natural logarithms in chemistry

Which of the following is a common method for determining empirical formulas in the laboratory?

• Titration

• Combustion analysis

• Chromatography

• Distillation

What is the relationship between the formula weight of a substance and its molar mass?

• They are inversely proportional

• They are always equal

• They are directly proportional

• There is no relationship

What is the molar mass of glucose, C6H12O6?

• 90.0 g/mol

• 150.0 g/mol

• 180.0 g/mol

• 210.0 g/mol

Which substance is the limiting reactant when 3.0 mol of N2 and 6.0 mol of H2 are allowed to react to form ammonia?

• NH3

• H2

• N2

• Not enough information provided

What is the theoretical yield of adipic acid if 25.0 g of cyclohexane reacts with excess oxygen?

• 125.0 g

• 100.0 g

• 75.0 g

• 50.0 g

What is the percent yield for the reaction if 33.5 g of adipic acid is obtained from the reaction in question 8?

• 25%

• 50%

• 75%

• 100%

What is the empirical formula of ascorbic acid (vitamin C) based on the given mass percentages of C, H, and O?

• C3H4O4

• C3H4O3

• C3H4O3

• C2H4O2