AQA A Level Study guides, Class notes & Summaries
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AQA A LEVEL Chemistry Questions & Correct Answers/ Graded A+
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Relative atomic mass 
: The average mass of an atom of an element, relative to 1/12th of the mass of an atom 
of Carbon-12 
Relative molecular mass 
: Average mass of a molecule compared to 1/12th of the mass of a carbon-12 atom 
The Avogradro constant 
: the number of particles in a mole 
ideal gas equation 
: pV = nRT 
empirical formula 
: the simplest whole number ratio of atoms of each element in a compound 
2 
percentage atom economy 
: (Mass of desired product/total mass of reactants) x 1...
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AQA A-Level Chemistry – Periodicity Questions & Correct Answers/ Graded A+
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s block 
: The block that belongs to hydrogen and groups 1 and 2 
Elements that have their highest energy e- in s-orbitals 
E.G. Na 1s1 2s2 2p6 3s1 
p 
: The block that belongs to the non-metals and metalloids 
Elements that have their highest energy e- in p-orbitals 
E.G. C 1s1 2s2 2p2 
d 
: Transition metals and b-block are not exactly the same (Scandium and Zinc are not 
transition metals) 
Elements that have their highest energy e- in d-orbitals 
1s1 2s2 2p6 3s2 3p6 4s2 3d6 
2 
f 
: The blo...
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AQA A Level Chemistry Transition Metals – Colours Questions & Correct Answers/ Graded A+
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Colour of MnO4- (+7 oxidation state) 
: purple 
Colour of CrO7 2- (+6 oxidation state) 
: orange 
Colour of V(O2)+ (+5 oxidation state) 
: yellow 
Colour of VO 2+ (+4 oxidation state) 
: blue 
Colour of V 3+ (+3 oxidation state) 
: green 
2 
Colour of Cr 3+ (+3 oxidation state) 
: green/violet 
Colour of Fe 3+ (+3 oxidation state) 
: yellow
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AQA A-level Chemistry paper 2 Questions & Correct Answers/ Graded A+
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Relative atomic mass (Ar) 
: Average mass of an atom compared with one twelth of the mass of an atom of carbon 
12 
Electronegativity 
: Power of an atom to attract the pair of electrons in a covalent bond 
Standard enthalpy of combustion 
: Enthalpy change when 1 mole of a substance burns completely in oxygen under 
standard conditions with all reactants and products being in their standard state 
Standard enthalpy of formation 
: Enthalpy change when 1 mole of a compound is formed from it's...
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AQA A LEVEL CHEM PRACTICALS - PAPER 3 Questions & Correct Answers/ Graded A+
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measuring e.m.f. of electrochemical cells 
: The standard cell potential is the e.m.f. between two half cells making up the cell, 
measured under standard conditions. 
clean piece of each metal, e.g. copper and zinc. degrease using propanone, 
place copper in a beaker with around 50cm₃ 1moldm⁻³ copper sulfate solution, place zinc in 
a seperate beaker of same concentration and volume zinc sulfate solution 
join the two beakers with filter paper coated in NaCl/potassium nitrate - acts as a...
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AQA Chemistry As Level Paper 1 Questions & Correct Answers/ Graded A+
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State the electron rules 
: Lowest energy filled first (3d>4s) 
Line up parallel 
Single until forced to pair 
Electronegativity 
: The ability of an atom to attract electrons within a covalent bond 
RAM (relative atomic mass) 
: Average mass of one atom compared to 1/12th the mass of a c-12 atom 
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Ionisation energy 
: The energy required to remove one mole of electrons from each of one mole of 
gaseous atoms to form one mole of positive gaseous ions 
2 
(Endothermic) 
Trends of Ionisat...
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AQA AS Chemistry Paper 1: Inorganic and Physical Chemistry Questions & Correct Answers/ Graded A+
- Exam (elaborations) • 12 pages • 2024
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Give the full electron configuration of an Al atom and a Cr3+ ion 
: 1s2 2s2 2p6 3s2 3p1 
1s 2s2 2p6 3s2 3p6 3d6 
Deduce the formula of the ion that has a charge 2+ with the same electron 
: Sr2+ 
Deduce the formula of the compound that contains 2+ ions and 3- ions that both have the 
same electron configuration as argon 
: CaP 
Deduce which of Na+ and Mg2+ is the smaller ion 2 marks 
: Mg 2+ 
2 
Both have the same number of shielding however Mg2+ has more protons so higher nuclear 
charge and...
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AQA GCSE Questions & Correct Answers/ Graded A+
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Describe the plum pudding model of the atom 
: A ball of positive charge with randomly embedded negatively charged electrons in it. 
Atom contains electrons, protons and neutrons. Write the three particles in order 
: ron 
n 
on 
Predict outer shells of tennessine 
: Number of outer shells: 7 
Reason: it is in group 7 
Why tennessine was not accepted as a new element by other scientists until 2015 
: Time needed for peer review 
2 
Plan a method to obtain pure dry crystals of zinc chloride from ...
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AQA 2023 EXAM BUNDLE
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ALL AQA EXAM PAPERS AND MARKING SCHEME FOR 2023.
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A Level Physics - Paper 1 Questions & Answers!!
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Superconductivity - ANSWER Superconductivity means that a material has zero resistivity/resistance. Resistance of the material decreases proportional to temperature, it becomes superconducting once under a critical transition temperature. 
 
Describe interaction that is responsible for keeping protons and neutrons together in a stable nucleus - ANSWER The strong interaction has a short range. It is attractive up to 5fm and repulsive from around below 0.5fm. The force is negligible for distances ...
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