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GCSE: Organic Chemistry

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  • Marked by Teachers essays 10
  • Peer Reviewed essays 18
  1. Marked by a teacher

    Hydrocarbons and the importance of oil as a power source.

    3 star(s)

    The most widely used conversion method is called cracking because it uses heat and pressure to crack heavy hydrocarbon molecules into lighter ones. A cracking unit consists of one or more reactors and a network of furnaces, heat exchangers and other vessels. Catalytic cracking or cat cracking is the basic petrol making process. Using intense heat (600�C), low pressure and a powdered catalyst (a substance that speeds up a chemical reaction), the cat cracker can convert most heavy fractions into smaller more useful molecules.

    • Word count: 1682
  2. Marked by a teacher

    Chemistry SCIEP

    3 star(s)

    The pressure will also be the same because we will not change altitude when doing the experiment. Theory We will start with a 2molar (m is molar) HCL - this means 2m dissolved in 1 litre of water. The equation for concentration is 20cm3 of 2m = 100% concentration. 15cm3 of 2m +5cm3 water= 15/20X100 = 75% Hydrogen =1g Chlorine =36.5g Hcl 1m =36.5g Hcl 2m =73g This means 73g of Hcl was dissolved in 1 litre of water to make 2M solution.

    • Word count: 1935
  3. Marked by a teacher

    Iron ore: processes and History

    3 star(s)

    This molten metal is then collected from the base of the oven. A furnace for smelting ironstone at high temperatures beyond the melting point of Iron (Fe, 1540�C) is used. These furnaces are used to produce cast iron. The furnace was a tall cavity funnelling out from the base into which layers of ironstone, fuel (either charcoal or coke) and limestone were added. The limestone was used to remove the unwanted components of the ironstone. Coal was not used as a fuel - as it contains Sulphur (S)

    • Word count: 1454
  4. Marked by a teacher

    Viscosity of Alkanes

    3 star(s)

    I will carry out an experiment to measure the viscosity of the alkanes listed. Preliminary Testing Plan My preliminary testing is to find the best height for the microscope slide, to make it possible to time the flow (viscosity) of the 4 liquids easily. This will be done using 2 of the above alkanes, Pentane and Decane. My testing will make sure that I do not have the slide raised too high or too low.A ramp too high will give the Alkanes too much kinetic energy, making it flow too fast to be manually timed.

    • Word count: 1538
  5. Peer reviewed

    An experiment to investigate the rate of reaction between

    5 star(s)

    This will lead to more collision, so the rate of reaction will increase also. Doubling the concentration will double the number of particles and also double the number of collision, doubling the rate of reaction in direct proportion. Before I carried out my 'real' experiment, I completed a preliminary experiment. I chose to test 0.4, 1.2 and 2.0 molar. I left the reaction for a total of 25 seconds and my results are as follows. Concentration Mass before Mass after Mass change 0.4 4.99 4.72 0.27 1.2 4.98 4.49 0.49 2.0 4.99 4.01 0.98 From my results I have come to the conclusion that they do support my prediction.

    • Word count: 1522
  6. Free essay

    First aid project - treating common injuries in the laboratory.

    4 star(s)

    After all of the chemical is washed away and the burn is not painful, cover the it with a sterile dressing. Injury from breathing in fumes or swallowing chemicals- 1. Make sure the casualty is able to breathe and, if necessary, clear their airway. Check their pulse and begin CPR if necessary, but do not give mouth to mouth so as to not put yourself at risk 2. Do not make the casualty throw up, unless the Poison Control tells you to do so.

    • Word count: 1051
  7. Peer reviewed

    The purpose of this lab is to identify two different unknown organic compounds, through investigating different chemical properties by various experiments. The chemicals could be alkanes (hexane), alkenes (hex-1-ene) or alcohols (methylpentan-1-ol or hexa

    3 star(s)

    Alkanes are very useful compounds that can be used in the production of polymers and fuels. The main uses for alcohols are as solvents for gums, resins etc. This is why it is important to be able to determine what different substances are. If we can determine it we can used it for the production of other things. Materials; * 3 Unknown chemical substances (A56, B56, A+B56) * Bromine water (Br2) * Distilled water (H2O) * Paraffin oil () * 3 Test tubes with lids * Test tube rack * 3 Pipettes * 1 Beaker * 3 Measuring cylinders * Water bath * Thermometer * Bunsen burner * Tripod Safety Materials; * Safety goggles * Lab

    • Word count: 1605
  8. Peer reviewed

    Chemistry Gold

    3 star(s)

    The most prominent use of gold is in jewellery (an item of adornment). Its other uses are, currency, computer chips, store of value, sculpture (gold plated items). The Properties of Pure Gold Pure gold which is 24 carat the most expensive because it is the most purest and has the least amount of other metals, and is actually bought for jewellery, the colour is yellow which also makes it charisma, this type of gold is the softest and the heaviest, it is the brilliant conductor of heat, the pure gold is unreactive therefore it can remain for decades.

    • Word count: 1560
  9. Peer reviewed

    Should food additives be banned

    3 star(s)

    Preservatives prevent them from deteriorating too rapidly. Low-calorie, low-carb and diabetic products would not be possible without intense sweeteners. Additives are an important part of the convenience foods that form a staple part of the busy modern lifestyle". I got this information from: http://www.understandingfoodadditives.org/pages/Ch2p0.htm The above website I think is reliable because it is checked by the government and by reading it the information that you know it is reliable. Additives and food ingredients have been used for thousands of years, to preserve food from one harvest to the next, and make it taste and look nicer.

    • Word count: 1843

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