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Chemistry SS 2 Week 1 Topic: Halogens Introduction The halogens are the collective name given to the elements in group VII of the Periodic Table. There are five halogens; fluorine, chlorine, bromine, iodine and astatine. Astatine is very radioactive and cannot exist for more than a few microseconds before decaying. We will thus be concerned […]
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Chemistry SS 2 Week 6 Topic: Oxides of Nitrogen Types of Nitrogen Oxides Oxides of nitrogen provide a fascinating picture from the point of view of their varied structures and diverse chemical behaviour. They range from N2O (oxidation state of nitrogen +1) through NO, N2O3, NO2, N2O4 to N2O5 in which the oxidation state of
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Chemistry SS 1 Week 5 Topic: Chemical Combination Introduction A chemical bond is the result of an attraction between atoms or ions. Chemical compounds are formed by the joining of two or more atoms. The types of bonds that a molecule contains will determine its physical properties, such as melting point, hardness, electrical and thermal
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Chemistry SS 1 Week 5 Topic: Chemical Combination Introduction A chemical bond is the result of an attraction between atoms or ions. Chemical compounds are formed by the joining of two or more atoms. The types of bonds that a molecule contains will determine its physical properties, such as melting point, hardness, electrical and thermal
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Chemistry, SS 2 Week: 5 Topic: Oxidation-Reduction Reaction Oxidation-reduction reactions involve the transfer of electrons between substances. They take place simultaneously, which makes sense because if one substance loses electrons, another must gain them. For example, all single-replacement reactions are redox reactions. Electrochemistry: The study of the interchange of chemical and electrical energy. Oxidation: The
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ALLOY Introduction Many of the pure metals are not widely used because of their properties such as hardness, tensile strength, resistance to corrosion and lustre can be improved by combining them with other element. The mixtures are known as alloys. An alloy is a mixture of two or more metals mixed in a certain percentage.
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Radioactive Decay Introduction Radioactive decay is the spontaneous radioactive disintegration of an atomic nucleus, resulting in the release of energy. Some atoms are stable. Others are unstable and ‘decay’, emitting radiation to achieve a stable state. The emissions from an unstable atom’s nucleus, as it decays, can be in the form of alpha, beta or
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