Deck 11: Solutions and Colloids

Question 1

Which of the following when dissolved in deionized water would make a good conducting solution? Outcome # 6) DOK 2) Paired item 1)

A) methanol
B) sugar
C) baking soda

Answer 1

baking soda

Question 2

Which of the following would be soluble in water? Outcome # 9) DOK 2)

A) sugar, NaCl, HCl
B) sugar, NaOH, ethane
C) sugar, HNO₃, methane

Answer 2

sugar, NaCl, HCl

Question 3

At what temperature does salt water freeze? Outcome # 7) DOK 1)

A) 0 °C
B) below 0 °C
C) above 0 °C

Answer 3

below 0 °C

Question 4

Which of the following is a colligative property? Outcome # 8) DOK 1)

A) boiling-point elevation
B) temperature of a solution
C) color of a solution

Question 5

Which of the following would be a weak electrolyte in solution? Outcome # 6) DOK 2)

A) acetic acid
B) sulfuric acid
C) hydroiodic acid

Question 6

What happens to the freezing point of water when ethylene glycol is added? Outcome # 8) DOK 2)

A) Ethylene glycol has no effect on the freezing point of water.
B) Ethylene glycol will interfere with the organization of water molecules during the freezing process therefore increasing the freezing point of water.
C) Ethylene glycol will interfere with the organization of water molecules during the freezing process therefore reducing the freezing point of water.

Question 7

For an experiment, you are asked to prepare a 2 m strong electrolytic solution. Which of the following salts would you use? Outcome # 6) DOK 3)

A) an alkali salt
B) an alkaline salt
C) either an alkali or an alkaline salt

Question 8

Patients who enter the emergency room dehydrated are usually given sterile saline solution intravenously. The solution administered is isotonic to prevent cell damage. What would happen if the solution was hypotonic? Outcome # 6) DOK 3)

A) Hypotonic solutions have a higher osmotic pressure than that within cells so hemolysis can occur.
B) Hypotonic solutions have a lower osmotic pressure than that within cells so hemolysis can occur.
C) Hypotonic solutions have the same osmotic pressure as that within cells so hemolysis can occur.

Question 9

Which of the following when dissolved in deionized water would make a poor conducting solution? Outcome # 6) DOK 2)

A) baking soda
B) sugar
C) salt

Question 10

Which of the following would conduct electricity? Outcome # 2) DOK 3)

A) solid NaCl
B) NaCl solution
C) both solid NaCl and a NaCl solution

Question 11

Assuming all the salts below are the same concentration, which salt would lower the freezing point of water the most? Outcome # 8) DOK 1)

A) NaCl
B) KBr
C) CaCl₂

Question 12

What would be the best method for lowering the freezing point of water in an ice tray that is in the freezer? Outcome # 8) DOK 3)

A) decrease the temperature of the freezer
B) decrease the temperature of the freezer and increase the surface area by transferring the water to a larger ice tray
C) add some table salt to the water

Question 13

Which of the following would be a strong electrolyte in solution? Outcome # 6) DOK 2)

A) PbI₂
B) KCl
C) AlOH)₃

Question 14

Which salt would lower the freezing point of a solvent the most? Outcome # 8) DOK 2)

A) 1.5m NaCl
B) 0.5m CaCl₂
C) 1.25m Na₂SO₄

Question 15

How would you purify salt water so that it becomes potable? Outcome # 2) DOK 1)

A) gravity filtration
B) vacuum filtration
C) distillation

Question 16

Which of the following substances would be a poor choice for making conductive solutions? Outcome # 6) DOK 3)

A) C₆H₁₂O₆, CH₃OH, CH₃CH₂OH
B) HCl, KBr, HNO₃
C) NaOH, KOH, LiOH

Question 17

Which of the following is a not a colligative property? Outcome # 8) DOK 1) Paired item 1)

A) boiling-point elevation
B) temperature of a solution
C) Freezing-point depression

Question 18

What would be the best method for raising the boiling point of water in a kettle by a few degrees Celsius? Outcome # 8) DOK 3)

A) increase the temperature of the stove
B) add some table salt to the water
C) increase the temperature of the stove and increase the surface area by transferring the water to a larger kettle

Question 19

If you want to boil a pot of water containing salt, at what temperature would boiling begin? Outcome # 7) DOK 1)

A) 100 °C
B) below 100 °C
C) above 100 °C

Question 20

Based off the molecular polarity of water, which of the following molecules would be soluble in water? Outcome # 4) DOK 2)

A) glucose, methanol, and ethanol
B) carbon dioxide, methane, methanol
C) glucose, carbon dioxide, ethanol

Question 21

Which type of solution has the same osmotic pressure as that within cells? Outcome # 6) DOK 1)

A) hypertonic
B) isotonic
C) hypotonic

Question 22

How would you be able to increase the boiling point of water on a hotplate? Outcome # 3) DOK 2)

A) increase the temperature of the hotplate
B) add less water and increase the temperature of the hotplate
C) add some NaCl to the water

Question 23

What is the osmolarity of a 2 M NaCl solution? Outcome # 6) DOK 1)

A) 2 osmol
B) 6 osmol
C) 4 osmol

Question 24

Which type of solution has a lower osmotic pressure than that within cells? Outcome # 6) DOK 1)

A) hypertonic
B) hypotonic
C) isotonic

Question 25

Which type of solution has a higher osmotic pressure than that within cells? Outcome # 6) DOK 1)

A) isotonic
B) hypertonic
C) hypotonic

Question 26

The solubility of KCl in water is ~344 g/L. What would be the best method for preparing a 100 mL saturated KCl solution? Outcome # 3) DOK 2)

A) add 38.0 g of KCl to 100 mL of H₂O at room temperature while stirring
B) add 30.0 g of KCl to 100 mL of H₂O at room temperature while stirring
C) add 34.0 g of KCl to 100 mL of H₂O at room temperature while stirring

Question 27

How would you increase the concentration of a 1 M NaCl solution? Outcome # 3) DOK 1)

A) decant some of the solution down the sink
B) bring the solution to near boiling until desired volume is achieved
C) decrease the temperature of the salt solution to near freezing

Question 28

Patients who enter the emergency room dehydrated are usually given sterile saline solution intravenously. The solution administered is isotonic to prevent cell damage. What would happen if the solution was hypertonic? Outcome # 6) DOK 3) Paired item 1)

A) Hypertonic solutions have the same osmotic pressure as that within cells so crenation can occur.
B) Hypertonic solutions have a lower osmotic pressure than that within cells so crenation can occur.
C) Hypertonic solutions have a higher osmotic pressure than that within cells so crenation can occur.

Question 29

The solubility of NaCH₃CO₂ in water is ~1.23 g/mL. What would be the best method for preparing a supersaturated NaCH₃CO₂ solution? Outcome # 3) DOK 2)

A) add 130 g of NaCH₃CO₂ to 100 mL of H₂O at 80 °C while stirring until all the solid dissolves, then let the solution cool to room temperature
B) add 123 g of NaCH₃CO₂ to 200 mL of H₂O at 80 °C while stirring until all the solid dissolves, then let the solution cool to room temperature
C) add 130 g of NaCH₃CO₂ to 100 mL of H₂O at room temperature while stirring until all the solid dissolves