Science Chemisty UNIT 3

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Atomic Weight
The Historical term that was used before relative atomic masses were defined in the 20th century.
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Periodic Table
An arrangement of elements int he order of their atomic numbers, forming groups and periods
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Alkali Metals
Elements in groups 1 of the periodic table, e.g Lithium (Li) Sodium (Na), Potassium (K)
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Transition Elements/ Metals
Elements from the central block of the periodic table. It has typical metallic properties and forms a coloured compound
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Soft Water
Water containing no dissolved calcium and/or magnesium salts, so it easily lathers with soap
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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.
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Soapless Detergents
A cleaning agent that does not produce scum when used with hard water
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Scale (Lime Scale)
The insoluble substance formed when temporary hard water is boiled
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Temporary Hard Water
Hard water which is softened when boiled
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Permanent Hard Water
Hard water whose calcium and/or magnesium ions are not removed when boiled, thus remaining hard
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ion-exchange column
A water softener which works by replacing calcium and magnesium ions with sodium or hydrogen ions, removing the hardness.
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Scum
The precipitate formed when soap reacts with calcium and/or magnesium ions in hard water
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Other cards in this set

Card 2

Front

An arrangement of elements int he order of their atomic numbers, forming groups and periods

Back

Periodic Table

Card 3

Front

Elements in groups 1 of the periodic table, e.g Lithium (Li) Sodium (Na), Potassium (K)

Back

Preview of the back of card 3

Card 4

Front

Elements from the central block of the periodic table. It has typical metallic properties and forms a coloured compound

Back

Preview of the back of card 4

Card 5

Front

Water containing no dissolved calcium and/or magnesium salts, so it easily lathers with soap

Back

Preview of the back of card 5
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