Chemical Reactions - Updated 2023 Question Preview (ID: 38094)


S2 Chemistry - Chemical Reactions Basic Principles And Some S1 Revision. TEACHERS: click here for quick copy question ID numbers.

What always happens in a chemical reaction?
a) A new substance is formed
b) There is a colour change
c) Precipitation
d) Effervescence

Bubbling or fizzing during a chemical reaction is called
a) Effervence
b) Efervescence
c) Effervescence
d) Effervessence

Name the element with atomic number 47
a) Angium
b) Gold
c) Silver
d) Aluminium

Which of the following is not a chemical reaction?
a) Water boiling
b) Vinegar and baking soda
c) Extracting copper from copper oxide
d) Burning hydrogen gas to make water

In a salt solution the salt which is added to the water is
a) the solute
b) the solvent
c) the solution
d) insoluble

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

When two solutions react to make an insoluble solid it is called
a) Effervescence
b) Decomposition
c) Precipitation
d) Fred

Iron and sulfur can be separated by
a) Filtration
b) Electrolysis
c) Distillation
d) A magnet

A compound containing only magnesium and sulfur would be called
a) Magnesium sulfide
b) Magnesium sulfate
c) Magnesium sulfite
d) Sulfur magneside

Magnesium hydroxide contains the elements
a) magnesium and hydroxide
b) magnesium and water
c) magnesium and hydrogen
d) magnesium hydrogen and oxygen

Chalk could be separated from water by
a) Filtration
b) Distillation
c) Electrolysis
d) Chromatography

Salt can be separated from water by
a) Evaporation
b) Electrolysis
c) Filtration
d) Chromatography

When two or more elements chemicall combine a __________ is formed
a) Mixture
b) Solution
c) Compound
d) Solvent

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