Chap 3: Dissolution in Water

Question 1

substances that are dissolved

Answer 1

solutes

Question 2

matter that dissolves other substances

Answer 2

solvent

Question 3

the matter formed after the dissolution
( solute+solvent )

Answer 3

solution

Question 4

what’s the difference between an emulsion and a colloid

Answer 4

• Emulsion: the two liquid components are initially immiscible with each other.
• Colloid: form when any state of matter (solid, liquid, or gas) combines with a liquid.

Question 5

energy is released (Exothermic)

Answer 5

• cause rise in temperature
• surroundings get hotter

Question 6

energy is absorbed (Endothermic)

Answer 6

• cause a drop in temperature
• surroundings get colder

Question 7

water is _____________________________

Answer 7

a universal solvent

Question 8

An aqueous solvent is ________________________________

Answer 8

a solution in which the solvent is water

Question 9

An non-aqueous solvent is ________________________________

Answer 9

is dissolving solute in with other liquids and not with water.

Question 10

what is solubility

Answer 10

the amount of solute (grams) dissolved in 100 grams of solvent to prepare a saturated solution

Question 11

• unsaturated:
• saturated:
• supersaturated:

Answer 11

• unsaturated: can still dissolve more solute
• saturated: cannot dissolve anymore
• supersaturated: holds more solute (that can’t dissolve anymore and can be seen salt)

Question 12

• concentrated solution:
• dilute solution:

Answer 12

• concentrated solution: a solution that contains a lot of solutes
• dilute solution: a solution that only contains a small amount of solutes

Question 13

(ω) Mass percentage =

Answer 13

(ω) Mass percentage =
mass of solute ⁄ mass of solution (solute+solvent)

Question 14

when the temperature rises (hotter) for solids, the solubility __________

Answer 14

increases

solid: temperature↑ solubility↑

Question 15

when the temperature rises (hotter) for gases, the solubility __________

Answer 15

decreases

gases: temperature↑ solubility↓

Question 16

examples of solubility decreases as the temparature increases for gases?

Answer 16

• the hotter the water gets (boiling), the more bubbles (gas) visible
• ^cause it’s less soluble (less bubbles are dissolved), hence making it more visible

Question 17

gas pressure↑ solubility?

Answer 17

gas pressure↑ solubility↑

Question 18

examples of crystals

Answer 18

• copper sulphate
• mica
• table (common) salt

Question 19

what is crystallization

Answer 19

the solute out of a solution is separated from the solvent

Question 20

evaporation of the solvent is for?

Answer 20

solid substances that have solubilities less affected by temperature

Question 21

cooling hot saturated solution is for?

Answer 21

solid substances that have solubilities very much affected by temperature