Homework Practice

Printable assignment

Final Assessment: Exploring Mixtures and their Separation

Section A: Classification and Properties

Question 1mcq

Salt solution is a:

A.Suspension

B.Homogeneous mixture

C.Compound only

D.Heterogeneous mixture

Question 2mcq

Milk is best classified as a:

A.Colloid

B.Suspension always

C.Element

D.True solution

Question 3mcq

A true solution is stable because solute particles:

A.Do not settle on standing

B.Settle quickly

C.Are visible grains

D.Can be filtered easily

Question 4mcq

Suspension particles can be separated by:

A.Only chromatography

B.Only distillation

C.No method

D.Filtration

Question 5mcq

Tyndall effect is shown by:

A.True solutions

B.Colloids

C.Elements only

D.Pure compounds only

Question 6mcq

A concentrated solution has:

A.No solute

B.More solute per amount of solution

C.No solvent

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.50%

B.20%

C.10%

D.5%

Question 8mcq

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

A.6%

B.2%

C.3%

D.18%

Question 9mcq

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

A.25%

B.20%

C.8%

D.12.5%

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.Colour only

C.Boiling point

D.Shape only

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.Cream from milk

B.Sugar from tea leaves

C.Salt from water by filtration

D.Camphor from sand

Question 14mcq

Centrifugation is useful for separating:

A.Dyes from ink

B.Salt from seawater

C.Ammonium chloride from salt

D.Cream from milk

Section C: Daily Life, Solubility and Inquiry

Question 15mcq

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

A.Crystallisation

B.Permanent gas formation

C.Magnetisation

D.Centrifugation

Question 16mcq

Separating stones from rice by hand uses:

A.Chromatography

B.Sublimation

C.Handpicking

D.Distillation

Question 17mcq

A safe lab habit is:

A.Taste unknown liquids

B.Point test tube at face

C.Heat closed containers randomly

D.Label chemicals and avoid tasting

Question 18mcq

A good separation model should show:

A.How the method separates components

B.Unrelated decoration

C.Only colours

D.No labels

Question 19mcq

A good conclusion should be based on:

A.Recorded observations and data

B.Friend’s answer only

C.Guess only

D.No experiment

Question 20mcq

A mixture that settles and scatters light is most likely:

A.Pure element

B.Suspension

C.True solution

D.Compound

Question 21mcq

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

A.Water is solid

B.Filter paper dissolves salt

C.Salt becomes gas

D.Dissolved salt particles pass through filter paper

Question 22mcq

Which method is suitable for separating iron filings from sand?

A.Magnetic separation

B.Evaporation only

C.Distillation

D.Chromatography

Question 23mcq

Broken glassware should be:

A.Used for heating

B.Picked up bare-handed

C.Reported and handled with proper safety procedure

D.Hidden in bag

Question 24mcq

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

A.Air only

B.Solvent at a given temperature

C.Metal only

D.Filter paper