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