Mixtures Quiz


Froggy Jumps Mixtures QuizVersión en línea Mixtures & separation por Ho Yeung Huang 1 What is a homogeneous mixture? a A pure compound with a fixed composition b A mixture with uniform composition throughout. c A substance made of only one element 2 Difference between pure substances and mixtures? a Pure substances are always solid b Mixtures have fixed ratios, pure substances do not c Pure substances have a single formula; mixtures contain more than one substance. 3 Define solvent and solute. a Solvent is the solid; solute is the gas b Solvent is the temperature; solute is the pressure c Solvent is the dissolving medium; solute is the substance dissolved. 4 What does a solubility curve show? a The color of a solute at different pressures b Solubility of a substance changes with temperature. c The density of a solution 5 Which technique separates an insoluble solid from a liquid? a Fractional distillation b Filtration c Evaporation 6 You have sand, salt and water. Outline a basic separation plan. a Boil all together until all separate b Filter to remove sand; evaporate to recover water; crystallise to recover salt. c Filter and then evaporate for sand and salt 7 R_f value calculation: solvent front 15 cm; dye moves 12 cm. R_f = ? a 0.8 b 1.25 c 0.60 8 Solubility curve interpretation: higher temperature generally causes... a Higher solubility for many solids. b Lower solubility for all substances c No change in solubility with temperature 9 Which technique best separates a pure liquid from a non-volatile solute? a Chromatography b Filtration c Distillation 10 Why can magnetism separate some mixtures? a Magnet changes the chemical composition b If one component is magnetic, a magnet pulls it away. c Magnetic components dissolve in solvent

1

What is a homogeneous mixture?

a

A pure compound with a fixed composition

b

A mixture with uniform composition throughout.

c

A substance made of only one element

2

Difference between pure substances and mixtures?

a

Pure substances are always solid

b

Mixtures have fixed ratios, pure substances do not

c

Pure substances have a single formula; mixtures contain more than one substance.

3

Define solvent and solute.

a

Solvent is the solid; solute is the gas

b

Solvent is the temperature; solute is the pressure

c

Solvent is the dissolving medium; solute is the substance dissolved.

4

What does a solubility curve show?

a

The color of a solute at different pressures

b

Solubility of a substance changes with temperature.

c

The density of a solution

5

Which technique separates an insoluble solid from a liquid?

a

Fractional distillation

b

Filtration

c

Evaporation

6

You have sand, salt and water. Outline a basic separation plan.

a

Boil all together until all separate

b

Filter to remove sand; evaporate to recover water; crystallise to recover salt.

c

Filter and then evaporate for sand and salt

7

R_f value calculation: solvent front 15 cm; dye moves 12 cm. R_f = ?

a

0.8

b

1.25

c

0.60

8

Solubility curve interpretation: higher temperature generally causes...

a

Higher solubility for many solids.

b

Lower solubility for all substances

c

No change in solubility with temperature

9

Which technique best separates a pure liquid from a non-volatile solute?

a

Chromatography

b

Filtration

c

Distillation

10

Why can magnetism separate some mixtures?

a

Magnet changes the chemical composition

b

If one component is magnetic, a magnet pulls it away.

c

Magnetic components dissolve in solvent

Froggy Jumps

Mixtures QuizVersión en línea

por Ho Yeung Huang