AQA Chem Study guides, Class notes & Summaries

Section A Answer all questions in this section. 0 1 This question is about atomic structure. In the nineteenth century JJ Thomson discovered the electron. He suggested that negative electrons were found throughout an atom like ‘plums in a pudding of positive charge’. Figure 1 shows an atom of element R using the ‘plum pudding’ model. An atom of R contains seven electrons. Figure 1 0 1 . 1 State two differences between the ‘pl...

AQA CHEMISTRY PAPER 1 EXAM QUESTIONS AND ANSWERS ALREADY GRADED A+ AQA CHEMISTRY PAPER 1 EXAM QUESTIONS AND ANSWERS ALREADY GRADED A+ AQA CHEMISTRY PAPER 1 EXAM QUESTIONS AND ANSWERS ALREADY GRADED A+ AQA CHEMISTRY PAPER 1 EXAM QUESTIONS AND ANSWERS ALREADY GRADED A+ AQA CHEMISTRY PAPER 1 EXAM QUESTIONS AND ANSWERS ALREADY GRADED A+

AQA June 2020 QP - Paper 2 AQA Chemistry AS-level AQA June 2020 QP - Paper 2 AQA Chemistry AS-level The equation for a reaction used to manufacture 1-chloropropane is 3CH3CH2CH2OH(l) + PCl3(l) → 3CH3CH2CH2Cl(l) + H3PO3(s) The enthalpy change for this reaction, ΔH, is –114 kJ mol–1 Table 1 contains some standard enthalpy of formation data

2023 June QP - Paper 2 AQA Chemistry AS-level

Inorganic AS AQA Chemistry What is a d-block (or f-block) element? - CORRECT ANSWER-An element that forms one or more stable ions with a partially filled d (or f) orbital What is an s-block (or p-block) element? - CORRECT ANSWER-An element with its outer electrons in the s (or p) orbitals What is the scientific name for the rows on the Periodic Table? - CORRECT ANSWER-Periods What is the scientific name for the columns on the Periodic Table? - CORRECT ANSWER-Groups What does the group numbe...

AQA Chemistry Paper 1 with complete solutions

GCSE AQA Chemistry Exam With All Answers what is a compound - ANSWER contains atoms of two or more elements which are chemically combined in fixed proportions how can compounds be separated into their component elements - ANSWER chemical reactions or electrolysis why is the total mass of products equal to the total mass of reactants - ANSWER no atoms are lost or made what is a mixture - ANSWER contains two or more elements or compounds which are not chemically...

AQA Chemistry Paper 1 with complete solution

Nucleons - ANSWER Protons and neutrons Electrons (location) - ANSWER Surrounding the nucleus Relative mass of an electron - ANSWER 1/1840 Strong nuclear force - ANSWER The way protons and neutrons are held together in the nucleus Electrostatic forces - ANSWER The attraction between protons and electrons that hold them together in the atom

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 - 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...