The nature of substances and chemical reactions 0.0 / 5 ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEWJEC Created by: MaddiejamesxCreated on: 09-04-18 23:06 What can't elements be? Chemically be made simpler 1 of 17 What does every atom of a particular element have? The same number of protons (Atomic number) 2 of 17 What is a compound? An element made of two 2 or more substances chemically joined 3 of 17 equation for finding the number of neutrons Mass number - Atomic number 4 of 17 What symbol is given to relative atomic mass? Ar 5 of 17 What does relative atomic mass tell you? The number of protons and neutrons in the nucleus 6 of 17 What is relative molecular mass (Mr) The Ar of the elements in a compound added together 7 of 17 What does filtration seperate? Insoluble molecules from liquids 8 of 17 what is the process of filtration? The filter retains insoluble molecules and the liquid moves through the filter paper 9 of 17 What does evaporation seperate? Soluble particles from liquids 10 of 17 What is the process of evaporation? The mixture is heated and the liquid will evaporate, leaving the solid behind 11 of 17 What does distillation seperate? A mixture of liquids 12 of 17 What is the process of distillation? Different liquids have different boiling temperatures. One liquid will evaporate before the other meaning one liquid will be left behind 13 of 17 What does chromatography seperate? Substances depending on their mass and solubility 14 of 17 What is a chemical reaction? Atoms rearranging 15 of 17 how do you know a chemical reaction has taken place? colour change, Effervescence (fizzing/gas) or temperature change 16 of 17 Give the acronym for empirical formula Mass used in the sum - Atomic number of elements used - Divide the above - Ratio found by dividing both answers by the smallest answer 17 of 17
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