As chemistry revision - Study guides, Class notes & Summaries

This document is a detailed and extensive guide for all of the 12 required practicals for AQA A level and AS Level chemistry. Revising the core practicals for exams can be difficult, so I prepared a resource which not only contains the method for each practical but also highlights where specific equipment/techniques/chemicals are being used and explains WHY it is being used (learning these will make core practical-related questions significantly easier). Key observations have additionally been h...

mass of an electron - correct answer 1/2000th of a proton relative charge and relative mass of a proton, neutron, and electron - correct answer proton: charge=+1 mass=1 neutron: charge=0 mass=1 electron: charge=-1 mass=1/2000th atomic number - correct answer the number of protons in the nucleus of an atom mass number - correct answer the sum of the number of neutrons and protons in an atomic nucleus isotopes - correct answer atoms of the same element with a different mass number an...

mass of an electron 1/2000th of a proton relative charge and relative mass of a proton, neutron, and electron proton: charge=+1 mass=1 neutron: charge=0 mass=1 electron: charge=-1 mass=1/2000th 00:01 01:39 atomic number the number of protons in the nucleus of an atom mass number the sum of the number of neutrons and protons in an atomic nucleus isotopes atoms of the same element with a different mass number and number of neutrons what is used a...

There are lots of random reactions in AQA A level chemistry that appear throughout the course, which could come up in your exams. Whilst it's not essential to have all of these equations memorised, being familiar with these equations will surely have a great impact on your performance, allowing you to answer certain questions spontaneously and spend less time figuring things out. At the very least, its important that you can derive these equations yourselves from just the reactants, as exam que...

Extensively and thoroughly organised list of all organic reactions required in the latest CIE AS Chemistry (9701) syllabus. A must-have revision tool that helped me gain an A* in Chemistry in the final A Levels massively.

TEST BANK 21st Century Astronomy FOURTH EDITION, Answered-1. Astronomy I. Definition i. Astronomy loosely translated means “patterns among the stars” (MC: 1) II. Your Place in the Universe i. Your address: street, city, town, country, Earth, Sun, Milky Way, Local Group, Virgo Supercluster, universe (MC: 3, SA: 1) ii. Solar System: classical versus dwarf planets (TF: 1, 2, MC: 1–4, 7, SA: 2) iii. Milky Way: contains 200 to 400 billion stars (MC: 3, 5–7) iv. Local Group (MC: 3, 8) ...

Chemistry AS Level AQA Physical Chemistry Revision

Enthalpy Changes The total chemical energy inside a substance is called the enthalpy (or heat content) When chemical reactions take place, changes in chemical energy take place and therefore the enthalpy changes An enthalpy change is represented by the symbol ΔH (Δ= change; H = enthalpy) An enthalpy change can be positive or negative Exothermic reactions A reaction is exothermic when the products have less energy than the reactants Heat energy is given off by the reaction to the surroun...