Chemistry Exam 3 Quizlet

A solution is made by dissolving 0.35 mole of LiI in enough water to give a final volume of 260.0 mL. What is the molarity of the solution? a. 0.091 M b. 0.67 M c. 1.3 M d. 2.6 M

C

A solution of iodine in carbon tetrachloride is 0.100 M. How much carbon tetrachloride must be added to 50.0 mL of this solution to reduce the concentration to 0.0250 M? [Assume volumes are additive.] a. 50.0 mL b. 100. mL c. 150. mL d. 200. mL

C

If we wish to prepare 250. mL of 0.200 M BaCl2 solution, how much solid BaCl2 is needed? a. 4.17 g b. 5.21 g c. 10.4 g d. 20.8 g

C

. If 145 mL of 2.00 M KOH is diluted to 1.15 L, the resulting solution contains a. 0.29 moles of KOH b. 2.30 moles of KOH c. 3.34 moles of KOH d. 23.0 moles of KOH

A

A beaker of salt water has some solid salt at the bottom? What type of solution is in the beaker? a. a saturated solution b. a supersaturated solution c. an unsaturated solution d. We cannot tell.

A

A chemist has a sample which is known to be a solution. Which of the following might be used to separate the components of the solution? a. chromatography b. filtration c. either a or b d. neither a nor b

A

A chemist has a sample which is known to be a solution. Which of the following might be used to separate the components of the solution? a. distillation b. filtration c. either a or b d. neither a nor b

A

A student is preparing a sugar water solution to make rock candy. When the student continues to add sugar to the solution no additional sugar dissolves. Which kind of solution does the student have? a. a saturated solution b. a supersaturated solution c. an unsaturated solution d. We cannot tell.

A

Choose the correct numerical value for the molarity from the response list for a solution using 50.0 mL of 0.40 M solution diluted to a final volume of 0.20 L . a. 0.10 M b. 0.12 M c. 0.25 M d. 0.30 M

A

How many moles of solute are contained in 500. mL of 0.50 M KCl? a. 0.25 b. 0.50 c. 1.0 d. 2.0

A

Which of the following combinations will always result in a solution? a. gas + gas b. liquid + liquid c. solid + solid d. none of these

A

Which of the following is true of electrolytes? a. All electrolytes have mobile ions. b. All electrolytes contain equal numbers of cations and anions. c. both a and b d. neither a nor b

A

Which of the following solutions will have the highest electrical conductivity? a. 0.1 M Na3PO4 b. 0.1 M Na2HPO4 c. 0.1 M NaH2PO4 d. All have the same conductivity.

A

A student is preparing a sugar water solution to make rock candy. When the student adds some sugar to the solution a large amount of sugar crystallizes. Which kind of solution does the student have? a. a saturated solution b. a supersaturated solution c. an unsaturated solution d. We cannot tell.

B

What is the mass of BaCl2 in a 0.250 L bottle of 0.200 M BaCl2? a. 5.21 g b. 10.4 g c. 41.7 g d. 52.1 g

B

What is the mass of NaCl in a 0.500 L bottle of 2.00 M NaCl? a. 29.3 g b. 58.5 g c. 117 g d. 234 g

B

What is the molarity of a solution containing 16.7 grams of NH3 in 1.50 liters of solution? a. 0.0653 M b. 0.653 M c. 1.53 M d. 11.1 M

B

What volume, in milliliters, of 4.0 M NaOH is needed to prepare 145 mL of 0.15 M NaOH by dilution? a. 3.9 × 103 mL b. 5.4 mL c. 2.6 × 10-4 mL d. 0.18 mL

B

Which of the following is a weak electrolyte? a. HCl b. CH3COOH c. both a and b d. neither of them

B

Which of the following is true of electrolytes? a. All electrolytes have water as a solvent. b. All electrolytes contain cations and anions. c. both a and b d. neither a nor b

B

Which of the following solutions will have the higher electrical conductivity? a. 0.1 M NaCl b. 0.2 M NaCl c. Both a and b have the same conductivity. d. Neither conducts electricity.

B

Which of the following will have the highest electrical conductivity? a. 0.1 M NaCl b. 0.2 M NaCl c. 0.3 M CH3COOH d. 0.4 M CH3COOH

B

A certain wine contains 0.0100 M NaHSO3 as a preservative. What mass of NaHSO3 is in a 750 mL bottle of this wine? a. 0.39 g b. 0.70 g c. 0.78 g d. 1.5 g

C

A chemist has a sample which is known to be a solution. Which of the following might be used to separate the components of the solution? a. chromatography b. distillation c. either a or b d. neither a nor b

C

A student is preparing a sugar water solution to make rock candy. When the student continues to add sugar to the solution the sugar dissolves. Which kind of solution does the student have? a. a saturated solution b. a supersaturated solution c. an unsaturated solution d. We cannot tell.

C

Assuming that the volumes are additive, what volume of water must be added to 35.0 mL of 12.0 M HCl to make a solution which is 3.00 M? a. 70.0 mL b. 87.5 mL c. 105 mL d. 140 mL

C

Choose the correct numerical value for the molarity from the response list for a solution using 75.0 mL of 0.20 M solution that has been concentrated to 60.0 mL. a. 0.10 M b. 0.12 M c. 0.25 M d. 0.30 M

C

In a solution of a gas in a liquid, the gas is called which of the following? a. concentrate b. dissolvate c. solute d. solvent

C

In a solution of a solid in a liquid, the solid is called which of the following? a. concentrate b. dissolvate c. solute d. solvent

C

The term alloy is applied to which of the following solvent/solute combinations? a. liquid/solid b. liquid/liquid c. solid/solid d. none of these

C

What volume of 12.0 M HCl must be used to make 300. mL of 0.600 M HCl? a. 1.50 mL b. 2.40 mL c. 15.0 mL d. 24.0 mL

C

Which must we do when preparing a solution of specific molarity? a. Carefully weigh the solute, carefully weigh the solvent. b. Carefully weigh the solute, carefully measure the volume of solvent. c. Carefully weigh the solute, fill the volumetric flask to the mark. d. None of the above is the correct procedure.

C

Which of the following happens when NaCl dissolves in water? a. The chloride ions are attracted to the negative end of the water dipole. b. Sodium and chloride ions form covalent bonds with water molecules. c. The sodium ions are attracted to the negative end of the water dipole. d. The sodium ions are attracted to the positive end of the water dipole.

C

Which of the following is a weak electrolyte? a. CO2 b. CH3COOH c. both a and b d. neither of them

C

Which of the following is true of all strong electrolytes? a. They are all ionic compounds. b. They all dissociate completely. c. both a and b d. neither a nor b

C

Which of the following is true of glucose, C6H12O6 , when it dissolves in water? a. It dissociates into ions. b. It forms covalent bonds with water. c. It forms hydrogen bonds with water. d. None of the above, glucose does not dissolve in water.

C

Which of the following is true of methanol, CH3OH, when it dissolves in water? a. It dissociates into ions. b. It forms covalent bonds with water. c. It forms hydrogen bonds with water. d. None of the above, methanol does not dissolve in water.

C

Which of the following solutions will have the highest electrical conductivity? a. 0.1 M NaCl b. 0.1 M BaCl2 c. 0.1 M AlCl3 d. All have the same conductivity.

C

Which of the following statements is correct for 25.0 mL of 3.0 M NH3 solution? (NH3 has a molar mass of 17.0 g.) a. 25.0 mL of solvent is present. b. 0.75 moles of solute is present. c. 1.3 grams of solute is present. d. More than one correct response. e. No correct response.

C

A 0.300 M solution of LiOH that contains 0.500 mole of solute would have a volume, in milliliters, of a. 30.0 mL b. 60.0 mL c. 6.00 × 102 mL d. 1.67 × 103 mL

D

A solution is prepared by dissolving 3.50 grams of NH4Cl in enough water to make 250. mL of solution. What is the concentration of this solution? a. 0.0327 M b. 0.0654 M c. 0.131 M d. 0.262 M

D

A solution is prepared by dissolving 4.40 g of KSCN in enough water to make 340. mL of solution. What is the concentration of the solution? a. 0.0440 M b. 0.0543 M c. 0.119 M d. 0.133 M

D

If we wish to prepare a 0.50 M solution of NaCl, how much water must be added to 1.0 mole of NaCl? a. 2.0 mol b. 2.0 L c. 2.0 × 103 g d. Enough water to make 2.0 L of solution.

D

In a solution of a solid in a liquid, the liquid is called which of the following? a. concentrate b. dissolver c. solute d. solvent

D

When alcohol is dissolved in water which is the solute? a. the alcohol b. the water c. the compound present in larger amount d. the compound present in smaller amount

D

Which of the following cannot serve as a solute in a solution? a. a gas b. a liquid c. a solid d. None, all can serve as solutes

D

Which of the following cannot serve as a solvent in a solution? a. a gas b. a liquid c. a solid d. None, all can serve as solvents.

D

Which of the following is true of electrolytes? a. All electrolytes have water as a solvent. b. All electrolytes contain equal numbers of cations and anions. c. both a and b d. neither a nor b

D

Which of the following will have the highest electrical conductivity? a. 0.1 M NaCl b. 0.2 M NaCl c. 0.3 M NaC2H3O2 d. 0.4 M NaC2H3O2

D

Which of the following solutions has a molarity of 1.0? a. 0.050 mole of solute in 25.0 mL of solution b. 2.0 moles of solute in 500.0 mL of solution c. 3.0 moles of solute in 1.5 L of solution d. more than one correct response e. no correct response

E