Separating Techniques quiz

1. Define the term Solubility

A measure of how warm a solution has to be to dissolve 100 g of solute

A measure of how much solute dissolves in a solvent (in g per 100g)

How quickly a solution can flow (in m s⁻¹)

The substance that dissolves in a solvent, forming a solution

Question 1 of 17

2. State 2 ways in which more solute could be dissolved in a saturated solution

Heat the solution. Add more solvent.

Add more solvent, cool the solution

Heat the solution. Filter

Heat the solution until it becomes saturated

Question 2 of 17

3. What do each of the following state symbols represent: (s), (l), (g), (aq)

(s) - solid. (l) - liquid. (g) - gas. (aq) - aqueous (in solution)

(s) - solid. (l) - liquid. (g) - gas. (aq) - water

(s) - solution. (l) - liquid. (g) - gas. (aq) - water

(l) - solid. (g) - liquid. (s) - gas. (aq) - aqueous (in solution)

Question 3 of 17

4. Describe a way in which the rusting of iron could be used to show the approximate percentage of oxygen in air

An excess of wet iron filings in left in a open system with a known volume of air. After several days the volume of air has fallen as the oxygen is used up. The percentage of oxygen in air is calculates as the change in volume of gas divided by the initial volume (x100%)

An excess of dry iron filings in left in a open system with a known volume of air. After several days the volume of air has fallen as the oxygen is used up. The percentage of oxygen in air is calculates as the change in volume of gas divided by the initial volume (x100%)

An excess of wet iron filings in left in a closed system with a known volume of air. After several days the volume of air has fallen as the oxygen is used up. The percentage of oxygen in air is calculates as the change in volume of gas divided by the initial volume (x100%)

An excess of dry iron filings in left in a closed system with a known volume of air. After several days the volume of air has fallen as the oxygen is used up. The percentage of oxygen in air is calculates as the change in volume of gas divided by the initial volume (x100%)

Question 4 of 17

5. Explain how a chromatogram shows that different dyes are different from each other

Each dye has components which rise to a different height on the paper

All the dyes rise to the same height on the paper

One of the dyes doesn\'t move at all

The dyes separate into different colours

Question 5 of 17

6. A graph shows the solubility of sodium chloride in water at 50°C is 34g/100g. At that temperature, what mass of sodium chloride will dissolve in 200g water?

17g

0.68g

0.34g

68g

Question 6 of 17

7. What is a base?

A source of hydroxide ions, OH⁻

An unreactive form of an alkali that is used to store it

A substance which can neutralise an acid, forming salt and water only

A compound that reacts with an acid to form hydrogen

Question 7 of 17

8. When preparing hydrated copper(II) sulfate crystals starting from copper(II) oxide, why is the acid gently heated?

To increase the concentration of the acid

To boil the acid

To ensure all the acid has reacted so there is no acid left

To speed up the reaction

Question 8 of 17

9. Describe a test to show whether water is pure

Add it to anhydrous copper(II) sulfate which will change from white to blue if the water is pure

Cool the sample and measure the temperature. If the sample is pure water it will freeze at 10⁰C

Add it to anhydrous potassium permanganate which will turn from white to purple if the water is pure

Heat the sample and measure the temperature. If the sample is pure water it will boil at 100⁰C

Question 9 of 17

10.

In paper chromatography, the paper is position so it touches the solvent, but why is the paper position so the baseline onto which dyes are placed is above the solvent?

So the dyes do not diffuse up the page too quickly

So the dyes have enough time to separate

So the solvent does not dissolve the pencil markings

So the dyes do not simply dissolve into the solvent

Question 10 of 17

11. What gas makes up around 1% of Earth's atomosphere?

argon

carbon dioxide

oxygen

chlorine

Question 11 of 17

12. What is the name for this piece of lab equipment?

flask

boiling tube

beaker

measuring cylinder

Question 12 of 17

13. Name this piece of lab equipment

measuring cylinder

dropping funnel

gas syringe

burette

Question 13 of 17

14. In chromatography, what are the minimum and maximum possible values for an Rf value?

Minimum=0. Maximum=1.

Minimum=-1. Maximum=1

Minimum=0. Maximum=0.5

Minimum=0. Maximum=100

Question 14 of 17

15. Define the term Solute

The unit of solubility

The substance that dissolves in a solvent, forming a solution

The substance left on the filter paper

The liquid which dissolves a substance

Question 15 of 17

16. A substance is found to melt at a single, fixed melting point. Is it likely to be a pure substance or a mixture of substances?

Pure

Mixture

Not enough information to decide

Question 16 of 17

17. State and explain how increasing temperature affects the diffusion of a gas

Gas diffuses quicker because particles have more energy.

Gas diffuses slower because the particles have less energy

Gas diffuses slower because the particles collide more often with the air

Gas diffuses quicker because there is less in its way

Question 17 of 17

Separating Techniques quiz

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