Unit 3 Solubility

Question 1

What’s the chemical formula for sodium nitrate?

Answer 1

NaNo3

Question 2

What shapes are formed by these different crystal salts?
Potassium nitrate
Sodium chloride

Answer 2

KNO3: long pointy needle shapes
NaCl: Cubed

Question 3

What is the chemical formula for potassium nitrate

Answer 3

KNO3

Question 4

What is the chemical formula for potassium chloride

Answer 4

KCI

Question 5

What is the chemical formula for sodium chloride

Answer 5

NaCl

Question 6

What is the chemical formula for sodium bi carbonate

Answer 6

NaHCO3

Question 7

What is the chemical formula for ammonia

Answer 7

NH3

Question 8

Define:
Solubility
Solute
Solvent
Solution

Answer 8

1. The concentration of the saturated solution/maximum possible concentration
2. Substance being dissolved
3. Usually a liquid in which a substance is dissolved
4. A homogeneous micture

Question 9

Define:
Mixture
Homogeneous
Saturated
Supersaturated
Precipitate

Answer 9

1. One of more things combined to create a new solution
2. The same composition everywhere after stirring or shaking
3. A solution with a maximum concentration
4. An unstable solution that dissolved more solute than its solubility
5. A solid formed by a change in solution

Question 10

Define:
Concentration
Watch glass
Evaporating dish

Answer 10

1. The amount of solute in a given amount of solvent or solution
2. A small shallow glass container
3. A bowl with a small lip for evaporating substances

Question 11

Define the effect of temperature on the solubility of a solid

Answer 11

The solubility increases with heat on the solubility of a solid

Question 12

Describe the effect of temperature on the solubility of a gas

Answer 12

Heating a gas causes its solubility to decrease and dissolved better in cold water

Question 13

What gas does the reaction between magnesium metal and sulphuric acid create?

Answer 13

Hydrogen gas

Question 14

Describe the reaction of magnesium carbonate and sufuric acid

Answer 14

Creates carbon dioxide

Question 15

What’s the laboratory test to identify hydrogen gas

Answer 15

When you put a burning splint into it it explodes with a pop

Question 16

What’s the laboratory experiment for carbon dioxide

Answer 16

Bubbling it through lime water makes lime water chalky

Question 17

What happens when you insert a wooden splint into CO2? Why isn’t this the test for canon dioxide

Answer 17

It will go out immediately. This isn’t the test because most gasses other than oxygen will do the same thing

Question 18

What’s the laboratory test to identify ammonia?

Answer 18

Use wet pink litmus and put it in the gas. If it’s a base as ammonia is, it will turn blue.

Question 19

Describe the solubility of ammonia gas in water. Why did the water rise into the container in our experiment?

Answer 19

Ammonia has a high solubility in cold water and a close to 0 solubility in hot water. When removing the stopper in cold water, the ammonia dissolved into it and the air pressure in the test tube decreased and the air pressure pushed the water into the tube.

Question 20

What’s the formula for finding the concentration of a solution?

Answer 20

Mass of solute. X 100
———————
Volume of solvent

Question 21

If a solutions concentration is equal to the solutions solubility, the solution is..

Answer 21

Saturated

Question 22

If a solutions concentration is less than its solubility, the solution is ..

Answer 22

Not saturated

Question 23

If a solutions concentration is more than its solubility, the solution is…

Answer 23

Super saturated