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Chemical Reactions - Updated 2023
Test Description: S2 Chemistry - Chemical Reactions basic principles and some S1 revision
Instructions: Answer all questions to get your test result.
1) What always happens in a chemical reaction?
A
Effervescence
B
Precipitation
C
A new substance is formed
D
There is a colour change
2) Bubbling or fizzing during a chemical reaction is called
A
Effervence
B
Efervescence
C
Effervescence
D
Effervessence
3) Name the element with atomic number 47
A
Aluminium
B
Silver
C
Angium
D
Gold
4) Which of the following is not a chemical reaction?
A
Water boiling
B
Burning hydrogen gas to make water
C
Vinegar and baking soda
D
Extracting copper from copper oxide
5) In a salt solution the salt which is added to the water is
A
the solute
B
the solvent
C
the solution
D
insoluble
6) What's the main difference between a compound and a mixture
A
They are always different colours
B
The elements in a mixture are chemically joined
C
It is easier to separate the elements in a compound
D
The elements in a compound are chemically joined
7) When two solutions react to make an insoluble solid it is called
A
Effervescence
B
Precipitation
C
Fred
D
Decomposition
8) Iron and sulfur can be separated by
A
A magnet
B
Filtration
C
Distillation
D
Electrolysis
9) A compound containing only magnesium and sulfur would be called
A
Magnesium sulfate
B
Magnesium sulfite
C
Sulfur magneside
D
Magnesium sulfide
10) Magnesium hydroxide contains the elements
A
magnesium hydrogen and oxygen
B
magnesium and hydroxide
C
magnesium and hydrogen
D
magnesium and water
11) Chalk could be separated from water by
A
Filtration
B
Distillation
C
Chromatography
D
Electrolysis
12) Salt can be separated from water by
A
Filtration
B
Electrolysis
C
Evaporation
D
Chromatography
13) When two or more elements chemicall combine a __________ is formed
A
Compound
B
Mixture
C
Solution
D
Solvent
*select an answer for all questions
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