Aqa as level chemistry Guías de estudio, Notas de estudios & Resúmenes

Nucleons - ANSWERS Protons and neutrons Electrons (location) - ANSWERS Surrounding the nucleus Relative mass of an electron - ANSWERS 1/1840 Strong nuclear force - ANSWERS The way protons and neutrons are held together in the nucleus Electrostatic forces - ANSWERS The attraction between protons and electrons that hold them together in the atom Atomic Number (Z) - ANSWERS The number of protons in the nucleus Mass number (A) - ANSWERS The total number of protons and neutrons in the nuc...

Answer all questions in this section. box This question is about rates of reaction. Potassium manganate(VII), KMnO4, reacts with sodium ethanedioate, Na2C2O4, in the presence of dilute sulfuric acid. 2 MnO –(aq) + 16 H+(aq) + 5 C O 2–(aq)  2 Mn2+(aq) + 8 H O(l) + 10 CO (g) The reaction mixture is purple at the start and goes colourless when all the MnO –(aq) ions have reacted. The rate of reaction can be measured as 1000 where t = the time taken for the mixture...

June QP - Paper 2 AQA Chemistry AS-level. June QP - Paper 2 AQA Chemistry AS-level.

Detailed notes for AQA AS level chemistry unit 3.1.3 (bonding). Covers: ionic bonding, metallic bonding, covalent bonding, dative covalent bonding, polarity, electronegativity, trends in electronegativity, bond polarisation, VSEPR theory, shapes of molecules and intermolecular forces. Includes diagrams and tips on exam technique (with techniques for comparing melting points of molecules).

Detailed notes for AQA AS level chemistry unit 3.1.2 (amount of substance). Covers: molecular/empirical formulae, mole/mass/Mr/Ar equations, ideal gas equation, percentage error/uncertainty, percentage yield, atom economy. Includes example calculations. Also covers methodology for (1) preparing a standard solution (2) conducting a simple titration.

Detailed notes for AQA AS level chemistry unit 3.1.4 (energetics). Covers: enthalpy changes and calculations, specific heat capacity, combustion practical, Hess's Law and mean bond enthalpies. Includes example calculations and additonal notes of experimental-based questions (related to percentage error/uncertainty, and experimental vs theoretical values).

Detailed notes for AQA AS level chemistry unit 3.1.1 (atomic structure). Covers: history of the atom, relative atomic mass, time of flight (TOF) mass spectrometry and calculations, electronic structure and ionisation energies. Includes diagrams and example calculations for RAM and TOF. Also explains exceptions to common trends, e.g. copper and chromium in electronic configuration, or period 3 in ionisation energy trends.