AS OCR A Chemistry Core Questions

150 + core questions based on OCR A's AS spec for the new course. Topics 2.1.1, 2.1.2, 2.1.3, 2.1.4, 2.1.5, 2.2.1, 2.2.2, 3.1.1, 3.1.2, 3.1.3 and 4.1.4 covered.

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AS Level Chemistry Core Qs 1
1 2.1.1 What are isotopes? Isotopes are atoms of the same element with
different numbers of neutrons and different

2 2.1.1 Define relative atomic mass RAM is the weighted mean mass of an atom

(Ar )
of the element relative to one twelfth…

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11 2.1.1 How do you calculate a
masstocharge ratio? Relative mass of ion
Relative charge on ion

12 2.1.1 What relationship exists The time of flight of the sample (t) is
between the time of flight of proportional to the square root of the mass
the sample (t) and the…

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22 2.1.3 What is the molecular The number and type of atoms of each
formula? element in a molecule.

23 2.1.3 If a salt is hydrated, what Water
does it contain?

24 2.1.3 If a salt is anhydrous, what Water
has been removed?

25 2.1.3 Define the term 'water of…

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Multiply the empirical formula by the answer
to find the molecular formula.

35 2.1.3 What do ionic equations Ionic equations show only the reacting
show? particles (and the products they form.) Ions
that don't get involved in the reaction the
spectator ions aren't written.

36 2.1.2 What is the formula…

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49 2.1.4 What happens when strong For strong acids, nearly all of the acid will

acids are reacted with water? dissociate i n water, and lots of the H+ ions
Which arrow is used for the are released. As the equilibrium lies very far
reaction equation? to the right, a…

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61 2.1.4 If you are completing a You need to double the number of moles of
titration calculation, what do a base to neutralise a diprotic acid.
you have to consider when
using a diprotic acid?

62 2.1.4 What is the molar volume

equation? Moles = concentration x vol (cm3)…

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72 2.1.5 The oxidation number of a Charge
monatomic ion is always the
same as its ________.

73 2.1.5 For molecular ions, the sum Overall charge
of the oxidation ions is
always equal to the ______

74 2.1.5 Oxygen nearly always has an 2
oxidation number of ____

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85 2.2.1 What is the relationship
between the quantum
number and the number of
electrons the shell can hold?

86 2.2.1 How many electrons can the 1st: 2
first four shells hold? 2nd: 8
3rd: 18
4th: 32

87 2.2.1 How do you define an atomic A region in…

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97 2.2.2 Do ionic compounds conduct Only when molten or in solution, as the
electricity? charged ions are free to move.

98 2.2.2 How is the ionic structure Ionic compounds have high melting and
linked to boiling point? boiling points. It takes a lot of energy to
overcome the strong…

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from smallest to largest bond lone pair/bonding pair angles
lone pair/ lone pair angles
lone pair/bonding pair
angles lone pair/lone pair angles
bonding pair/bonding pair
angles Biggest

109 2.2.2 A molecule with two bonded Linear
pairs has a _____ shape.
The bond angle is _______.

110 2.2.2 A…







hi VdbV how are you? :))

Sachin Patel27





AMAZING RESOURCE!!! Maybe add to the first definition 

the same number of protons because the spec has changed a bit and you have to say the same number of protons to get full mark



where's salters B : (   ?

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