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