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Chemistry SS 2 Week 6 Topic: Oxygen and Its Compound Introduction – Oxygen Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetal and oxidizing agent that readily forms compounds (notably oxides) with most elements. Oxygen is the third […]
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Chemistry, SS 1, Week 1 Topic: Introduction to Chemistry Meaning of Chemistry Chemistry is a branch of science that deals with the composition, properties and the uses of matter. It probes into the principles governing the changes that matter undergoes. Our environment is made up of matter; chemistry therefore deals with the study of our
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Chemistry, SS 1 Week 3 Topic: Salts Introduction A salt is an ionic compound formed when the hydrogen of an acid is partly or completely replaced by a metal ion or ammonium ion. All salts are chemically and electrically neutral. Example: Diagram above shows that when the hydrogen ion in nitric acid is replaced by
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Week 5 Topic: Hydrogen Introduction Hydrogen was first isolated and shown to be a discrete element by Henry Cavendish in 1766. Before that, Robert Boyle and Paracelsus both used reactions of iron and acids to produce hydrogen gas. Antoine Lavoisier gave hydrogen its name because it produced water when ignited in air. Hydrogen comes from
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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 2 Topic: Energy Changes in Chemical Reactions Introduction Energy changes take place during the chemical reactions. Almost all the chemical reactions involve some sort of change in energy; either they absorb energy or release energy, generally in the form of heat. Heat is a form of energy that always flows from
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