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Chapter 6 Periodic Table, Periodic table, Mass is Conserved during…
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Periodic table
By discovering various types of elements, the study on the elements becomes more difficult.
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The elements in group 14 consist of metals, semi-metals and non-metals.
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Compound
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The tendency of an element to form a compound chemically shows that the compound is more stable than element.
Physical properties of a compound are different from physical properties of the elements it is made up of.
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Mixture
Consists of two or more elements or compound, which are mixed physically.
A mixture formed when:
(a) Two or more elements are mixed physically.
(b)Elements and compounds are mixed physically.
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The physical properties of a mixture are the same as the physical properties of the elements present in it.
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Molecules
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Is made up of atoms by chemical bond such as iconic bond, metallic bond and covalent bond.
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Element
Is the simplest form of substance. It cannot be divided to two or more substances. There is only one type of atom in an element.
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Atom
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Consist of proton, neutron and electron. The number of proton, neutron and electron of an atom determines a certain element.
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Metals and non-metals
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Examples of metal elements are copper, iron, aluminium and zinc
Non-metal elements exist as solid, liquid and gas.
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Electrical conductivity
The circult as in the diagram is prepared and both ends of the copper foil are connected using crocodile clips
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Molecules
A group of atoms joined together by chemical bond such as iconic bond, metallic bond and covalent bond.
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Chromatography
Is a suitable method for separating dissolved substances of different colours such as ink and colouring
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Using a magnet
This method is suitable for separating a magnetic substance from a non-magnetic substance by using a magnet
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Sodium burns in a yellowish bright flame to produce white powder. The yellowish green colour of chlorine disappears.
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