Explain why it is difficult to separate iron and sulphur mixture after strong heating.
Mention the suitable solvent for each of the following solutes:
i)
grease;
ii)
ink stain;
iii)
starch;
iv)
cube sugar;
v)
oil paint;
vi)
iodine.
i)
What is a mixture?
ii)
Explain why some mixtures are thoroughly stirred before they are used.
i)
Define each of the following terms:
α)
solvent;
β)
solute.
ii)
Name one common solvent used in the home.
(i)
Name suitable solvents for the following substances:
oil paint, fat, common salt, plant pigments.
(ii)
What is the name given to a substance dissolved by a solvent?
State the method which could be use to separate each of the following mixtures and explain your answer in each case:
i)
salt and water;
ii)
sawdust and iron filings;
ii)
powdered charcoal and water.
Describe how you would separate a mixture of sodium chloride and sand.
Classify each of the following substances as colloids, suspension or solution: Smoke, breast milk, powdered milk in water, sea water, mist, steel.
i)
What is a solution?
ii)
Differentiate between solutions and mixtures in terms of particle sizes.
Define mixture
Describe briefly how a mixture of sand and common salt could be separated
State the method that could be used to separate each of the following compounds:
i)
iodine and sand
ii)
ethanol and water
Give two examples of a mixture
Describe briefly how a mixture of common salt and powdered sulphur could be separated.
a)
Define each of the following terms:
i)
alloy
ii)
colloid
b)
Give two examples each of:
i)
alloy
ii)
colloid
Name the separation method used in the production of each of the following substances
(i)
akpeteshie (alcohol)
(ii)
common salt
(iii)
tap water
Name a suitable solvent for each of the following substances
(i)
grease
(ii)
oil paint
(iii)
alcohol
(iv)
sugar
Explain why a fitting mechanic washes his greasy hands with petrol and not with water.
(i)
What is a saturated solution?
(ii)
State whether each of the following is a solution, suspension or a colloid:
Clay in water
Sugar in water
Ammonia in water
Powdered chalk in water
Potassium permanganate in water
Soap in water
Explain how sulphur can be obtained from a mixture of powdered sulphur and iron filings.
Distinguish between solution and suspension
Name the method which could be used to separate each of the following mixtures into their components:
(i)
Alcohol and water
(ii)
Salt and water
(iii)
Powdered charcoal and iron filings
(iv)
Powdered chalk and water
What is a solution?
Classify each of the following items as element, compound, mixture or colloid:
(i)
Sodium chloride
(ii)
Sugar solution
(iii)
Fog
(iv)
Hydrogen
(v)
Sulphur
Show how you would separate each of the following mixtures:
(i)
Common salt and sand
(ii)
Muddy water
Explain briefly why air is regarded as a mixture.
State one solvent for each of the following substances
(i)
Common salt
(ii)
Paint
(iii)
Coal tar
(iv)
Sucrose
(v)
Chlorophyll
Classify each of the following substances as an element, compound or mixture: Water, air, potassium, alcohol, common salt, sugar
Classify each of the following substances as element, compound or mixture:
i)
Air;
ii)
Brass;
iii)
Chlorine;
iv)
Gold;
v)
Water.
Describe briefly how a sample of pure sugar could be obtained from a mixture of sugar and sand.
What is the name given to a solid mixture?
i)
State two classes of mixtures.
ii)
Classify each of the following substances under the classes stated in (i)
(α) bronze;
(β) when perfume is sprayed into the air.
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