Question 1
Question
What is the relative mass of an electron?
Question 2
Question
A negative charge means that there's more protons than electrons
Question 3
Question
What did Bohr discover?
Question 4
Question
Relative isotopic mass is the average mass of a molecule compared to 1/12 of the mass of an atom of carbon-12
Question 5
Question
What is the equation linking moles, mass and molar mass?
Answer
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Moles = molar mass / mass
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Molar mass = moles / mass
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Moles = mass / molar mass
Question 6
Question
If [blank_start]temperature[blank_end] and pressure stay the same, one mole of any gas always has the same [blank_start]volume[blank_end] - this is known as the molar gas volume ([blank_start]dm³mol⁻¹[blank_end]).
Answer
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concentration
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temperature
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volume
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mass
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partial pressure
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moldm⁻³
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dm³mol⁻¹
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gdm⁻³
Question 7
Question
Acids are proton acceptors
Question 8
Question
H⁺ ions can never exist by themselves in water
Question 9
Question
What are the products of a reaction between acids and bases?
Question 10
Question
What are the products of acids and metal hydroxides?
Question 11
Question
The water in a lattice is called [blank_start]water of crystallisation[blank_end]. A solid salt containing water of crystallisation is [blank_start]hydrated[blank_end]. A salt is [blank_start]anhydrous[blank_end] if it doesn't contain water of crystallisation.
Answer
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water of crystallisation
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hydrated
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anhydrous
Question 12
Question
In the presence of an acid, what colour does methyl orange turn?
Answer
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Red
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Yellow
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Pink
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Orange
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Colourless
Question 13
Question
In the presence of an alkali, what colour does phenolphthalein turn?
Answer
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Red
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Yellow
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Pink
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Orange
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Colourless
Question 14
Question
Compared to a monoprotic acid, you'll need to double the number of moles of base to neutralise a diprotic acid
Question 15
Question
The actual mass/yield will always be [blank_start]less[blank_end] than the theoretical yield as not all chemicals [blank_start]react[blank_end] fully and some chemicals are [blank_start]lost[blank_end] between transfers
Question 16
Question
In a substitution reaction, the atom economy is always less than 100%
Question 17
Question
What are the CORRECT rules for oxidation numbers?
Answer
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Uncombined elements (or elements bonded to identical atoms) have an oxidation number of 0
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Oxygen always has an oxidation number of -2
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Hydrogen always has an oxidation number of +1, except in metal hybrids where it's -1 and molecular hydrogen where it's 0
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The sum of the oxidation numbers for a neutral compound is 0
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For molecular ions, each of the constituent atoms has the same oxidation number of as the molecule's overall charge
Question 18
Question
Oxidation is a gain in electrons
Question 19
Question
In the reaction below, which elements have been oxidised and which have been reduced:
2K + H₂SO₄ --> K₂SO₄ + H₂
Answer
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K has been oxidised, H has been reduced
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H has been oxidised, K has been reduced
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S has been oxidised, K has been reduced
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K has been oxidised, S has been reduced
Question 20
Question
What is the chemical formula of sulphate (VI) ions?