Science Chemisty UNIT 3 0.0 / 5 ? ChemistryThe Periodic TableWater hardness and solubilityGCSEAQA Created by: GeorgianaaCreated on: 12-01-15 16:47 Atomic Weight The Historical term that was used before relative atomic masses were defined in the 20th century. 1 of 12 Periodic Table An arrangement of elements int he order of their atomic numbers, forming groups and periods 2 of 12 Alkali Metals Elements in groups 1 of the periodic table, e.g Lithium (Li) Sodium (Na), Potassium (K) 3 of 12 Transition Elements/ Metals Elements from the central block of the periodic table. It has typical metallic properties and forms a coloured compound 4 of 12 Soft Water Water containing no dissolved calcium and/or magnesium salts, so it easily lathers with soap 5 of 12 Hard Water Water in which it is difficult to lather with soap. It contains calcium and/or ions which react with soap to produce scum. 6 of 12 Soapless Detergents A cleaning agent that does not produce scum when used with hard water 7 of 12 Scale (Lime Scale) The insoluble substance formed when temporary hard water is boiled 8 of 12 Temporary Hard Water Hard water which is softened when boiled 9 of 12 Permanent Hard Water Hard water whose calcium and/or magnesium ions are not removed when boiled, thus remaining hard 10 of 12 ion-exchange column A water softener which works by replacing calcium and magnesium ions with sodium or hydrogen ions, removing the hardness. 11 of 12 Scum The precipitate formed when soap reacts with calcium and/or magnesium ions in hard water 12 of 12
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