understanding of COMBUSTION and the establishment of the law of conservation of matter. Lavoisier gave oxygen its name‚ which is derived from two Greek words that mean "acid former." Lavoisier held the mistaken idea that oxides‚ when dissolved in water‚ would form only acids. It is true that some oxides when dissolved in water do form acids; for
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m paper Chemistry Notes & Worksheet: Acids‚ Bases & Salt Name : __________________________________________________ ( ) Class : Secondary 3 Maju/Cemerlang Date : ______ August 2012 Acids Definition: Substances that release hydrogen ions (H+) when dissolved in water. Strong Acids | Weak Acids | Chemical Name | Chemical Formula | Organic acids such as citric acid‚ ethanoic acid. | Hydrochloric acid | HCl | | Sulphuric acid | H2SO4 |
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Thermite Background: Thermite is a powder made from aluminum powder and a metal oxide [usually iron oxide (Fe2O3‚ known as rust)]. The thermite reaction is a redox reaction‚ where Aluminum reduces the oxide of another metal. For example‚ when using iron oxide (as I did) the equation would be Fe2O3(s) + 2 Al(s) -> Al2O3(s) + 2 Fe(l). Black or blue iron oxide (Fe3O4) could also be used. Other examples of possible oxides are manganese thermite (MnO2)‚ Cr2O3‚ and copper thermite (CuO). Aluminum can also
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1.7.2 Coal Bottom Ash in Self-Compacting Concrete Coal Bottom Ash has gained a great consideration as an alternative for replacing fine aggregates. Coal Bottom Ash has physical characteristics are same as that of naturally found sand which makes it suitable for replacing sand in concrete. Coal Bottom Ash represents good pozzolanic element reactivity when it comes in contact with finer elements. Many researchers in their research work claimed that the properties of Self-Compacting Concrete comprised
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and oxides of nitrogen. SO2‚ natural: - Geothermal hot springs and volcanic activity are natural sources of SO2. - In the process of decaying of organic matter some bacteria will produces hydrogen sulphide as a waste product which will oxidise‚ forming so2. - Phytoplankton release dimethyl sulphide (DMS) into the atmosphere‚ when this is oxidised it forms sulphuric acid. NOx‚ natural: - Lightning activity generates high temperatures to allow oxygen and nitrogen to combine. Nitric oxide combines
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Earth in distant regions. The corrosive nature of acid rain causes widespread damage to the environment. The problem begins with the production of sulfur dioxide and nitrogen oxides from the burning of fossil fuels‚ such as coal‚ natural gas‚ and oil‚ and from certain kinds of manufacturing. Sulfur dioxide and nitrogen oxides react with water and other chemicals in the air to form sulfuric acid‚ nitric acid‚ and other pollutants. These acid pollutants reach high into the atmosphere‚ travel with the
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indicator on it. The powder absorbs moisture from the soil‚ allowing the colour of the indicator to be clearly seen. • 2. ACIDS IN THE ATMOSPHERE Identify natural and industrial sources of sulfur dioxide and oxides of nitrogen. Oxides of nitrogen are: Nitrous oxide (N2O)‚ Nitric oxide (NO) and Nitrogen dioxide (NO2) SULFUR DIOXIDE Natural sources: Volcanoes‚ geothermal hot springs Industrial sources: Combustion
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teeth. It can be supplied in bottles of powder and liquid‚ which are mixed on a glass slab or paper pad using a spatula. The liquid in glass ionomer cement contains itaconic acid‚ tartaric acid‚ maleic acid and water. The powder includes zinc oxide‚ aluminum oxide and calcium. One of the best qualities about this type of cement is that it releases Fluoride‚ which helps prevent tooth decay. It slowly is released from this powder because of its special combination of glass‚ ceramic particles and a glassy
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Supersaturated solution A solution that contains more of the solute than is present in a saturated solution. Solubility of some compounds (salts‚ hydroxides and oxides) on water We’ll return to this information next term for the topic – Acids‚ Bases and Salts Salts‚ oxides‚ and hydroxides are IONIC compounds. Some salts‚ oxides and hydroxides are soluble in water and some are insoluble. The reason some ionic compounds are insoluble in water is given here. All NITRATE compounds are soluble
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of the mole. METALS Reacting Gas Volumes AIM: to investigate the relationship between the volumes of gases involved in a reaction. HYPOTHESIS: A new gas will form when two gases will react together. BACKGROUND INFORMATION: Nitric oxide and oxygen are both colourless gases which do not dissolve in water. However‚ when they mix they form a different gas called nitrogen dioxide which is brown‚ soluble in water and has a particular odour. This is an example of two gases reacting together
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