12762898
Frage 1
Frage
What is the relative mass of an electron?
Antworten
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1/200
-
1/2000
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1/20
-
1
Frage 2
Frage
A negative charge means that there's more protons than electrons
Antworten
- True
- False
Frage 3
Frage
What did Bohr discover?
Antworten
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Protons
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Electrons
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Neutrons
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Ions
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Shells
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Noble gases are inert
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Plum pudding model
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Atoms are solid spheres
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The nucleus is positively charged
Frage 4
Frage
Relative isotopic mass is the average mass of a molecule compared to 1/12 of the mass of an atom of carbon-12
Antworten
- True
- False
Frage 5
Frage
What is the equation linking moles, mass and molar mass?
Antworten
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Moles = molar mass / mass
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Molar mass = moles / mass
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Moles = mass / molar mass
Frage 6
Frage
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]).
Antworten
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concentration
-
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
Frage 7
Frage
Acids are proton acceptors
Antworten
- True
- False
Frage 8
Frage
H⁺ ions can never exist by themselves in water
Antworten
- True
- False
Frage 9
Frage
What are the products of a reaction between acids and bases?
Antworten
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Salt and water
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Salt and hydrogen
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Salt, carbon dioxide and water
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Salt
Frage 10
Frage
What are the products of acids and metal hydroxides?
Antworten
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Salt and hydrogen
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Salt and water
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Salt, carbon dioxide and water
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Salt and metal oxides
Frage 11
Frage
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.
Antworten
-
water of crystallisation
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hydrated
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anhydrous
Frage 12
Frage
In the presence of an acid, what colour does methyl orange turn?
Antworten
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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
Frage 13
Frage
In the presence of an alkali, what colour does phenolphthalein turn?
Antworten
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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
Frage 14
Frage
Compared to a monoprotic acid, you'll need to double the number of moles of base to neutralise a diprotic acid
Antworten
- True
- False
Frage 15
Frage
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
Antworten
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less
-
react
-
lost
Frage 16
Frage
In a substitution reaction, the atom economy is always less than 100%
Antworten
- True
- False
Frage 17
Frage
What are the CORRECT rules for oxidation numbers?
Antworten
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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
Frage 18
Frage
Oxidation is a gain in electrons
Antworten
- True
- False
Frage 19
Frage
In the reaction below, which elements have been oxidised and which have been reduced:
2K + H₂SO₄ --> K₂SO₄ + H₂
Antworten
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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
Frage 20
Frage
What is the chemical formula of sulphate (VI) ions?
Antworten
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SO₃²⁻
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SO₄²⁻
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SO₃⁻
-
SO₄⁻
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