Chemistry all definitions crossword (part 1) 0.0 / 5 ? ChemistryeverythingIGCSECIE Created by: KitsuneCreated on: 21-02-17 16:31 Number of protons in a nucleus of an atom Proton number 1 of 41 The total number of protons and neutrons in a nucleus of an atom Nucleon number 2 of 41 Atoms of the same element with the same number of protons and electrons but a different number of nucleons Isotopes 3 of 41 Average mass of naturally occurring atoms of an element on a scale where the C-12 atom has a mass of exactly 12 units Relative atomic mass 4 of 41 The sum of relative atomic masses Relative molecular mass 5 of 41 A specific number of particles that is equal to the number of atoms contained in 12g of Carbon. 12g of Carbon contains 6.023 x 10^23 atoms. Mole 6 of 41 The breakdown of an ionic compound, molten or in an aqueous solution, by the passage of electricity Electrolysis 7 of 41 Loss of electrons/gain of oxygen Oxidation is loss, reduction is gain 8 of 41 Gain of electrons/loss of oxygen Reduction 9 of 41 Any reaction in which electron transfer takes place Redox 10 of 41 Made in a factory Synthetic 11 of 41 Contains additives that break down in sunlight Photodegradable 12 of 41 Random motion of particles caused by them being struck by other particles Brownian motion 13 of 41 Movement of particles from an area of higher concentration to an area of lower concentration in liquid or gas until equilibrium is reached Diffusion 14 of 41 Smallest particles in nature that cannot be broken down further by any chemical means Atoms 15 of 41 A group of atoms held together by covalent bonds Molecule 16 of 41 A particle that carries a charge because of an imbalance of protons and electrons Ion 17 of 41 Change of state from solid to Sublimation 18 of 41 A liquid that evaporates easily Volatile 19 of 41 Different forms of the same element Allotropes 20 of 41 Attraction between metal ions and free electrons Metallic bond 21 of 41 Number of electrons an element's atom loses, gain or shares to form a compound Valency 22 of 41 The amount of solute, in grams or moles, that is dissolved in 1 dm3 of solution Concentration 23 of 41 Shows the simplest ratio in which atoms combine Empirical formula 24 of 41 Shows the actual number of atoms that combine to form a molecule Molecular formula 25 of 41 The amount of product you obtain from a reaction Yield 26 of 41 Concentrated solution of sodium chloride Brine 27 of 41 A reaction where the energy taken in to break bonds is less than the energy released in making bonds Exothermic 28 of 41 A reaction where the energy taken in to break bonds is more than the energy released in making bonds Endothermic 29 of 41 Energy needed to break bonds or energy released when bonds are made Bond energy 30 of 41 Any substance we use to provide energy Fuel 31 of 41 A reaction which is endothermic in one direction an exothermic in another, with the same amount of energy being transferred each time Reversible 32 of 41 Forward and backward reaction occur at the same rate so there is no overall change in concentrations of products or reactants Equilibrium 33 of 41 Measure of change that happens in a single unit of time Rate 34 of 41 Something that indicates whether something is an acid or a base Indicator 35 of 41 All molecules dissociate to form ions Strong acid 36 of 41 Only some molecules dissociate to form ions Weak acid 37 of 41 A reaction that gives metal salt and water Neutralisation 38 of 41 Ions that are present but don't take part in the reaction Spectator 39 of 41 When one reactant is slowly added to another in the presence of an indicator Titration 40 of 41 Treating waste gases with lime in power stations to remove sulfur dioxide. Flue gas desulfurisation 41 of 41
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