WorksheetsY1 Chem Revision
Total questions: 20
Worksheet time: 14mins
Name
Class
Date
1.
In fractional distillation, a mixture of liquids is separated based on their..
a)
Boiling points
b)
Solubility
c)
Density
d)
Chemical composition
2.
Which mixture can be separated by adding water, stirring and filtering?
a)
copper & tin
b)
sulfur & sugar
c)
table salt & sugar
d)
table salt & copper(II) sulfate crystals
3.
Which of the following will affect the solubility of a solute in ethanol?
a)
Rate of stirring
b)
Temperature of ethanol
c)
Volume of ethanol
d)
Size of solute particles
4.
Which statement is correct about a solute and a solvent?
a)
They combine chemically.
b)
They always combine in equal proportions.
c)
They do not always form a saturated solution.
d)
They cannot be separated by physical methods.
5.
Which mixture can be separated by sublimation?
a)
A mixture of water and iron filings.
b)
A mixture of sand and iodine.
c)
A mixture of water and ethanol.
d)
A mixture of sand and water.
6.
Which separation technique can be used to extract water from a food dye solution?
a)
Paper chromatography
b)
Evaporation to dryness
c)
Simple Distillation
d)
Filtration
7.
Solid X is dissolved in solvent Y. Which separation technique should be used to obtain pure solid X?
a)
Filtration
b)
Evaporation to dryness
c)
Crystallisation
d)
Simple distillation
8.
Ms Seet wants to separate the components from a mixture of iron filings, chalk and table salt. Which shows the most appropriate sequence to be used?
a)
Magnetic attraction, mix with water, crystallisation
b)
Magnetic attraction, mix with water, filtration, evaporation to dryness
c)
Mix with water, filtration, evaporation to dryness
d)
Mix with water, magnetic attraction, filtration, crystallisation
9.
Brass is a metal alloy made from 69% copper and 31% zinc. Which statement best describes brass?
a)
suspension of copper in zinc
b)
suspension of zinc in copper
c)
solution of copper in zinc
d)
solution of zinc in copper
10.
Which statement describes a suspension?
a)
The colour and density is the same throughout the mixture.
b)
There is no residue after filtration
c)
It has an insoluble substance mixed with liquid.
d)
No particles settle to the bottom when it is left to stand.
11.
Which substance will form a solution when added to water?
a)
Calcium carbonate
b)
Copper(II) sulfate
c)
Sulfur
d)
Iron filings
12.
When we distill sodium chloride solution, water is obtained as the...
a)
distillate
b)
filtrate
c)
residue
d)
sublimate
13.
Which separation methods both involve a change in the state of matter?
a)
chromatography & simple distillation
b)
simple distillation & sublimation
c)
sublimation & filtration
d)
chromatography & filtration
14.
Which mixture, when filtered, leaves no residue on the filter paper?
a)
calcium carbonate in water
b)
copper(II) sulfate solution
c)
fresh orange juice
d)
muddy water
15.
Which substance is not an element?
a)
calcium
b)
zinc
c)
iodine
d)
steel
16.
Sulfur exists as S8. Which statement describes sulfur correctly?
a)
Each molecule has 8 elements chemically combined
b)
It is a mixture of 8 elements
c)
Each molecule has 8 atoms chemically combined
d)
It is a compound with 8 atoms chemically combined
17.
Which statement correctly describes a compound?
a)
It boils at a fixed temperature
b)
Its properties are similar to that of its elements
c)
It is made of substances that are not chemically combined
d)
It is separated into elements by physical methods
18.
When sulfur powder and iron filings are heated, iron(II) sulfide is formed. Which is true?
a)
1 compound has been broken down to form 2 elements
b)
2 compounds are combined to form a mixture
c)
2 elements are combined to form a compound
d)
2 elements are combined to form a mixture
19.
What property of different substances enable them to be separated using chromatography?
a)
They must be visible
b)
They are small
c)
They must have high melting points
d)
They can dissolve in the same solvent
20.
The main principle behind chromatography is that..
a)
solubility of a solute decreases with temperature
b)
substances have different solubility in the same solvent
c)
the components are coloured
d)
very small amount of sample is required
100 %
