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International Baccalaureate: Chemistry

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  1. Investigating the Effects of Surface Area on the Rate of Reaction

    Independent Volume of the gas collected (H2, CO2) The amount of gas collected for each experiment will depend on the Controlled 1. Mass of Calcium Carbonate (both marble chips and powdered form) 2. Mass of Magnesium (both ribbon and powder) 3. Volume of Hydrochloric Acid 4. Apparatus Used 1. The masses of the substances utilized will remain constantly fixed during the experiment 2. 50 cm3 of HCl will be used for every trial ? 550 cm3 in total 3. The apparatus used will remain the same throughout the whole experiment Chemical Reactions: Mg + 2HCl ? MgCl2 + H2 1.

    • Word count: 1941
  2. Should the Use of Coal to Generate Electricity be Replaced by Biomass Energy?

    (IEA, 2008) Significantly, 77% of electricity in Australia (IEA, 2008) is produce from the combustion of coal. ?The Sydney Morning Herald? reported that an average Australian person uses 5 tons of coal each year for electricity (Manning, 2012). Coal is relatively inexpensive in Australia as there are high content of coal viable, and this is one of the main reason for the continuous use of coal to generate electricity (Australian Coal Association , 2011). ?Mongbay?, an environmental science website, showed that it costs up to a maximum of 180 dollars to purchase a metric ton of coals in Australia (Butler, 2012).

    • Word count: 1658
  3. Objective: To investigate the order of oxidizing ability of the halogens Cl2, Br2, and I2 in aqueous solution

    About 1mL of Potassium bromide solution is added to each of two test tubes 2. About the same volume of chlorine water is added to one of these tubes and the other was added with the same volume of iodine solution 3. The test tubes is shake and the color changes is noted-(if any) 4. A few drops of hexane are added to each tube, shake and allow it to settle and the color of each layer is noted. 5. Reaction that taken place is observed and a copy of result are completed in table 11.1.

    • Word count: 1640
  4. The use of volumetric flask, burette and pipette in determining the concentration of NaOH solution

    The volumetric flask was cleaned and rinsed with distilled water 2. 5 ml of NaOH solution was transferred into the volumetric flask using funnel and the remaining NaOH was washed into the flask several times using distilled water. 3. The NaOH solution was topped up to 250 cm3 with distilled water , the cap was closed up and the flask was rotated several times to get a homogenous solution. 4. The solution was poured into a clean and dry beaker , the beaker was labeled and was covered with a watch glass and put it aside.

    • Word count: 1605

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