AQA AS Level Biology Paper 1

Activation energy The minimum energy that a particle needs in order to react Atom economy mass of desired products/total mass of reactants x 100 Atomic orbital A region of space where there is a high probability of finding an electron Avogadro’s constant The total number of particles in one mole of a substance or 6.022 x 10^23

AQA AS LEVEL PHYSICS Paper 2 June 2022 Mark Scheme

Activation energy The minimum energy that a particle needs in order to react Atom economy mass of desired products/total mass of reactants x 100 Atomic orbital A region of space where there is a high probability of finding an electron Avogadro’s constant The total number of particles in one mole of a substance or 6.022 x 10^23

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+ Both have the same number of shielding however Mg2+ has more protons so higher nuclear charge and so stronger ...

Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. AS ECONOMICS Paper 2 The National Economy in a Global Context AQA 7135-2- ECONOMICS PAPER 2 2 *02* IB/M/Jun20/7135/2 Do not write outside the Section A box Answer all questions in this section. Only one answer per question is allowed. For each question completely fill in the circle alongside the appropriate answer. CORRECT METHOD WRONG ME...

Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. AS ECONOMICS Paper 2 The National Economy in a Global Context AQA 7135-2- ECONOMICS PAPER 2 2 *02* IB/M/Jun20/7135/2 Do not write outside the Section A box Answer all questions in this section. Only one answer per question is allowed. For each question completely fill in the circle alongside the appropriate answer. CORRECT METHOD WRONG ME...

Answer all questions in the spaces provided. box 0 1 . 1 What is a gene? [1 mark] 0 1 . 2 Describe how the production of messenger RNA (mRNA) in a eukaryote cell is different from the production of mRNA in a prokaryote cell. [2 marks] 0 1 . 3 Scientists produced a short, single-stranded, artificial nucleic acid, called PNA. The PNA binds to a small section of DNA. The scientists introduced PNA into cells and discovered that these cells produced less mRNA than cells that did not contain ...

AQA GCSE CHEMISTRY 8462/1H Paper 1 Higher Tier June 2022 FINAL MARK SCHEME GCSE CHEMISTRY 8462/1H Paper 1 Higher Tier Mark scheme Jan 2022 Version: 1.0 Final Mark Scheme *206G8462/1H/MS* MARK SCHEME – GCSE CHEMISTRY – 8462/1H – JUNE 2020 2 Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevant questions, by a panel of subject teachers. This mark scheme includes any amendments made at the standardisation events which all associates ...

Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signat ure F Tuesday 21 May 2019 Morning Time allowed: 1 hour 30 minutes Materials For this paper you must have: • mathematical instruments You must not use a calculator. Instructions • Use black ink or black ball-point pen. Draw diagrams in pencil. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer ...