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WorksheetsChemistry Entry level paper 2 - first section
Total questions: 22
Worksheet time: 13mins
Name
Class
Date
1.
Dyes in water soluble markers may be separated by means of..
a)
crystallization
b)
sublimation
c)
chromatography
d)
sedimentation
2.
chromatography separate the mixture of dyes on the basis of their ----------------------------
a)
density
b)
solubility
c)
gravity
d)
boiling point
3.
Is blood a mixture?
a)
No
b)
Yes
4.
A combination of pure substances, not in fixed amounts, that can be easily separated.is a
a)
MIXTURE
b)
COMPOUND
c)
ATOM
d)
PARTICLE
5.
On the chromatogram given -------------- is mixture.
a)
red
b)
orange
c)
green
d)
black
6.
The diagram below shows a chromatogram obtained when a sample X was analysed together with four other known dyes P, Q, R and S. Dye Q was known to cause cancer. Which of the following dye(s) is/are safe for use?
a)
P only
b)
S only
c)
P and S
d)
P and X
7.
What type of charge does a metal ion have?
a)
+
b)
-
8.
What is electrolysis?
a)
breaking down of a compound using a current
b)
making a compound using a current
9.
What is the name given to the solution that is being electrolysed?
a)
Salt solution
b)
Electric solution
c)
Mineral solution
d)
Electrolyte
10.
Explain why the electrolyte has to be a liquid.
a)
So the ions can move
b)
So the electrons can move
c)
So that it doesn't get too hot
d)
So the fish are ok
11.
Which metal is more reactive than calcium?
a)
magnesium
b)
potassium
c)
silver
d)
aluminum
12.
What is an ore?
a)
a solid metal
b)
a rock cantaining a metal combined with other elements
c)
an element
d)
an object used to row a boat
13.
Which of these elements is unlikely to be found native?
a)
gold
b)
platinum
c)
aluminium
d)
silver
14.
Which element cannot be extracted from its ore by reduction with carbon?
a)
iron
b)
aluminium
c)
copper
d)
lead
15.
How could you extract sodium from molten sodium chloride?
a)
reduction by carbon
b)
electrolysis
c)
decomposition
d)
oxidation
16.
How would you best extract iron from haematite (iron ore)?
a)
reduction by carbon
b)
electrolysis
c)
decomposition
d)
oxidation
17.
What does the word insoluble mean?
a)
Does dissolve
b)
Doesn't dissolve
c)
Is part of a solid
18.
A pure substance shows ------------------ spot on chromatogram
a)
0
b)
1
c)
2
d)
3
19.
What would molten potassium bromide break down into?
a)
Potassium and bromide
b)
Potassium and bromine
c)
Just potassium
d)
Just bromine
e)
Just bromide
20.
What does water with sulphuric acid break down into
a)
hydrogen and oxygen
b)
hydride and oxide
c)
sulphate and hydrogen
d)
acid and water
21.
What is the formula of hydrochloric acid
a)
HC
b)
HCl
c)
HCl2
d)
HCl3
22.
What is the name of the process that uses electricity to separate the elements in a compound?
a)
reduction
b)
electrolysis
c)
extraction
d)
mining
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