Homework Practice

Printable assignment

Final Assessment: Exploring Mixtures and their Separation

Section A: Classification and Properties

Question 1mcq

Salt solution is a:

A.Compound only

B.Homogeneous mixture

C.Suspension

D.Heterogeneous mixture

Question 2mcq

Milk is best classified as a:

A.Colloid

B.True solution

C.Suspension always

D.Element

Question 3mcq

A true solution is stable because solute particles:

A.Can be filtered easily

B.Settle quickly

C.Are visible grains

D.Do not settle on standing

Question 4mcq

Suspension particles can be separated by:

A.Only distillation

B.No method

C.Filtration

D.Only chromatography

Question 5mcq

Tyndall effect is shown by:

A.Pure compounds only

B.Colloids

C.Elements only

D.True solutions

Question 6mcq

A concentrated solution has:

A.More solute per amount of solution

B.No solvent

C.No solute

D.Only large particles

Section B: Concentration and Separation Methods

Question 7mcq

5 g solute in 50 g solution gives mass by mass percentage of:

A.20%

B.5%

C.50%

D.10%

Question 8mcq

6 g solute in 300 mL solution gives mass by volume percentage of:

A.6%

B.18%

C.2%

D.3%

Question 9mcq

25 mL ethanol in 200 mL solution gives volume by volume percentage of:

A.25%

B.12.5%

C.8%

D.20%

Question 10mcq

Crystallisation is used to:

A.Obtain pure crystals from solution

B.Separate dyes only

C.Separate cream from milk

D.Separate iron using magnet

Question 11mcq

Distillation is useful when components differ in:

A.Magnetism only

B.Shape only

C.Colour only

D.Boiling point

Question 12mcq

Paper chromatography separates ink because dyes have different:

A.Mass numbers

B.Magnetic forces

C.Movement on paper

D.Boiling vessels

Question 13mcq

Sublimation can separate:

A.Salt from water by filtration

B.Camphor from sand

C.Sugar from tea leaves

D.Cream from milk

Question 14mcq

Centrifugation is useful for separating:

A.Cream from milk

B.Ammonium chloride from salt

C.Salt from seawater

D.Dyes from ink

Section C: Daily Life, Solubility and Inquiry

Question 15mcq

If solubility increases with temperature, cooling a saturated solution may cause:

A.Permanent gas formation

B.Magnetisation

C.Centrifugation

D.Crystallisation

Question 16mcq

Separating stones from rice by hand uses:

A.Distillation

B.Chromatography

C.Handpicking

D.Sublimation

Question 17mcq

A safe lab habit is:

A.Taste unknown liquids

B.Label chemicals and avoid tasting

C.Point test tube at face

D.Heat closed containers randomly

Question 18mcq

A good separation model should show:

A.How the method separates components

B.No labels

C.Only colours

D.Unrelated decoration

Question 19mcq

A good conclusion should be based on:

A.Guess only

B.No experiment

C.Friend’s answer only

D.Recorded observations and data

Question 20mcq

A mixture that settles and scatters light is most likely:

A.Pure element

B.True solution

C.Suspension

D.Compound

Question 21mcq

Why can salt not be separated from salt solution by ordinary filtration?

A.Filter paper dissolves salt

B.Dissolved salt particles pass through filter paper

C.Salt becomes gas

D.Water is solid

Question 22mcq

Which method is suitable for separating iron filings from sand?

A.Magnetic separation

B.Chromatography

C.Evaporation only

D.Distillation

Question 23mcq

Broken glassware should be:

A.Used for heating

B.Hidden in bag

C.Picked up bare-handed

D.Reported and handled with proper safety procedure

Question 24mcq

Solubility is usually expressed as amount of solute dissolving in a fixed amount of:

A.Metal only

B.Filter paper

C.Solvent at a given temperature

D.Air only