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