Chemistry SS 2 Week 5 Topic: Compound of Nitrogen (Ammonia) Introduction Ammonia was earlier known by the name “alkaline air.” It was identified in 1716 by J. Kunckel. It was prepared in a lab for the first time by Joseph Priestly in 1774. Although Claude Berthelot studied the chemical composition of the gas in 1785,
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Chemistry SS 2 Week 5 Topic: Compound of Nitrogen (Ammonia) Introduction Ammonia was earlier known by the name “alkaline air.” It was identified in 1716 by J. Kunckel. It was prepared in a lab for the first time by Joseph Priestly in 1774. Although Claude Berthelot studied the chemical composition of the gas in 1785,
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Introduction Alkanols (or alcohols) are a homologous series of organic compounds with the general formula CnH2n+1OH or simply ROH. Their molecules consist of a functional group — the hydroxyl group (—OH) joined to an alkyl group (R—). They can be used to fuel cars as they are flammable. Unlike alkanes, alkenes and alkynes, alkanols are
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Week 6 Topic: Amorphous Forms of Carbon Coal Coal is formed in nature by the carbonization of wood. Conversion of wood to coal under the influence of high temperature, high pressure and in the absence of air is termed carbonization. Amongst coal varieties, anthracite is the purest form. It contains about 94 – 95% of
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Base – A base is a compound that produces OH– ions or electrons in water or that accepts protons. An example of a common base is sodium hydroxide, NaOH. A substance that will neutralise an acid is called a base. When an acid reacts with a base, a salt and water is formed. If a
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Introduction Three equations relate these quantities: amperes x time = Coulombs 96,500 coulombs = 1 Faraday 1 Faraday = 1 mole of electrons Calculating the Quantity of Substance Produced or Consumed To determine the quantity of substance either produced or consumed during electrolysis given the time a known current flowed: Write the balanced half-reactions involved.
Here are some chemistry terms and their meanings. This will be useful to a lot of secondary school students. α-carbon – An alpha carbon is the carbon in a molecule bonded to an atom or moiety of interest. α-carbon is the most common notation for the alpha carbon. α-hydrogen – a hydrogen atom bonded to the α-carbon in a molecule. α-hydrogen
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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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Chemistry SS1 Week 8 Topic: Gas Law Introduction Gas has existed since the beginning of time; oftentimes, it was referred to as “air” or “oxygen;” however, in the late 18th century, “air” became known as gas, and people were able to distinguish between different types of gas. Towards the end of the 18th century, scientists
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