Atom economy Study guides, Revision notes & Summaries

AQA AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry Question Paper + Mark scheme [MERGED] June 2022 *JUN* IB/M/Jun22/E7 7404/2 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 Section B TOTAL Time allowed: 1 hour 30 minutes Materials For this paper you must have: • the Periodic Table/Data Sheet, provided as an insert (enclosed) • a ruler with millimetre measurements • a scientific calculator, which you are expected to use where appropriate. Instructions...

OCR 2023 Chemistry A H032/01: Breadth in chemistry AS Level Question Paper & Mark Scheme (Merged) Please Review and leave your Rating stars…. Please write clearly in black ink. Do not write in the barcodes. Centre number Candidate number First name(s) Last name Oxford Cambridge and RSA Tuesday 16 May 2023 – Morning AS Level Chemistry A H032/01 Breadth in chemistry Time allowed: 1 hour 30 minutes * INSTRUCTIONS • Use black ink. You can use an HB pencil, but only for gra...

OCR AS LEVEL CHEMISTRY A H032/01 BREADTH IN CHEMISTRY ORIGINAL 2024 EXAM 100 % COMPLETE QUESTIONS AND ANSWERS A+ SCORE GUARANTEED.CHECK THE LAST PAGE FOR ANSWERS. 1 Which substance contains polar molecules? A C2H4 B CO2 C NCl 3 D SF6 Your answer [1] 2 What is the formula of silver carbonate? A AgCO3 B Ag(CO3)2 C Ag2CO3 D Ag3CO3 Your answer [1] 3 Which statement explains why ice is less dense than water? A Hydrogen bonds are stronger in ice than in water. B H...

AQA CHEMISTRY A LEVEL WITH COMPLETE SOLUTIONS covalent bond - ANSWER-a shared pair of electrons between non-metal elements co-ordinate bond - ANSWER-a shared pair of electrons where both electrons are supplied by one atom repulsion in shapes of molecules - ANSWER-Lone pair-lone pair > lone pair-bonding pair > bonding pair-bonding pair electronegativity - ANSWER-the power of an atom to attract the pair of electrons in a covalent bond hess' law - ANSWER-Total enthalpy chang...

A LEVEL CHEMISTRY EXAM WITH COMPLETE SOLUTIONS alkali - A type of base that dissolves in water forming hydroxide ions, OH- (aq) ions. alkanes - The homologous series with the general formula: CnH2n+2. alkyl group - An alkane with a hydrogen atom removed, e.g. CH3, C2H5; alkyl groups are often shown as 'R'. amount of substance - The quantity whose unit of the mole. Chemists use 'amount of substance' as a means of counting atoms. anhydrous - A substance that contains no water mo...

Relative atomic mass : The average mass of an atom of an element, relative to 1/12th of the mass of an atom of Carbon-12 Relative molecular mass : Average mass of a molecule compared to 1/12th of the mass of a carbon-12 atom The Avogradro constant : the number of particles in a mole ideal gas equation : pV = nRT empirical formula : the simplest whole number ratio of atoms of each element in a compound 2 percentage atom economy : (Mass of desired product/total mass of reactants) x 1...

AQA AS level Chemistry exam 2024 questions with 100% correct answers 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 nu...

AQA 2023 AS CHEMISTRY QUESTIONS WITH 100% CORRECT ANSWERS Absolute temperature - ANSWERS Temperature measured in Kelvin Absolute zero - ANSWERS The lowest possible temperature theoretically achieveable - 273.15 degrees celius or zero Kelvin Acceleration - ANSWERS The stage in mass spectrometry where positive ions are speeded up by an electric field Acid rain - ANSWERS Rain that has been acidified by pollutants such as sulfur dioxide Actual yield - ANSWERS Mass of product obtained in a ...

AQA AS level Chemistry exam 2024 questions with 100% correct answers 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 nu...

Chemistry AQA AS EXAM 2024 QUESTIONS WITH 100% CORRECT ANSWERS Mass number - ANSWERS Total number of protons and neutrons. Atomic number - ANSWERS Numbers of protons in the nucleus and number of electrons in shells. Negative Ions - ANSWERS More electrons than protons. Positive ions - ANSWERS More protons than electrons. Relative isotopic mass - ANSWERS mass of an atom of an isotope of an element on a scale where an atom of carbon12 is 12. Relative atomic mass - ANSWERS average mass o...