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

QUESTIONS AND ANSWERS

Define the term enthalpy of lattice formation The standard enthalpy change when 1 mole if solid ionic compound is formed from its gaseous ions. Explain why a value for enthalpy of lattice formation of silver iodide based on the perfect ionic model gives a smaller numerical value than the value calculated in the question AgCl contains covalent character Forces/bonds holding lattice together are stronger Identify a reagent that could be used to indicate the presence of iodide ions in an aque...

AQA A-LEVEL PSYCHOLOGY PAPER 3 2020. Materials For this paper you must have: • an AQA 16-page Answer Book. You may use a calculator. Instructions • Use black ink or black ball-point pen. • Write the information required on the front of your answer book. The Paper Reference is 7182/3R. • In Section A, you should answer all questions. • In Section B, choose one topic. Answer all questions on the topic you choose. • In Section C, choose one topic. Answer all questions on th...

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...

Activity level (nuclear) Number of unstable nuclei that disintegrate per second, measured in Bq Angular speed (w) Angle through which a point on a rotating object rotates through per second Angular acceleration change of angular velocity per time Background radiation weak level of radiation found everywhere Binding energy energy released when forming a nucleus from it's constituent nucleons. Also the energy required to

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 ...

A Surname Other Names Centre Number Candidate Number Candidate Signature Level 3 Technical Level IT: CYBER SECURITY IT: NETWORKING IT: PROGRAMMING IT: USER SUPPORT Unit 1 Fundamental principles of computing Y/507/6424 Thursday 16 May 2019 Morning Time allowed: 2 hours At the top of the page, write your surname and other names, your centre number, your candidate number and add your signature. [Turn over] INSTRUCTIONS • Use black...

Level 3 Technical Level IT: CYBER SECURITY IT: NETWORKING IT: PROGRAMMING IT: USER SUPPORT Unit 1 Fundamental principles of computing Thursday 16 May 2019 Morning Time allowed: 2 hours Materials For this paper you must have: • a ruler • a scientific calculator (non-programmable) • stencils or other drawing equipment (eg flowchart stencils). Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You ...