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International Baccalaureate: Chemistry

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  • Peer Reviewed essays 1
  1. Biodiesel Investigation - How the concentration of Potassium Hydroxide solution would affect the yield of biodiesel when transesterified with a standard sample of vegetable oil .

    I do feel as though this is an important experiment to engage in as scientists find biodiesels an extremely useful substance to use in machines and such. To try an experiment which involves looking at factors that can change the output of the product, would be a stepping stone to building a stronger understanding on the substance itself and how more of it can be obtained and perhaps what benefits it may serve. The experiment conducted was intent on looking at a certain independent variable (the concentration)

    • Word count: 3179
  2. To determine the molecular mass of an unknown alkali metal carbonate, X2CO3.

    Volume of substance Z solution ? 25.0cm3 of substance Z solution was used for each of the nine trial. Dependent Variables: 1. Volume of 0.1M HCl required to neutralize 25.0cm3 of substance Z ? The end-point was determined only when the methyl orange indicator completely changed color from yellow to orange. Controlled Variables: 1. Molarity of HCl ? It was 0.1M for all trials. 2. Drops of Phenolphthalein ? For all trials, only three drops were used to prevent any misinterpretation of the reaction?s end point. 3. Volume of water used to dissolve all samples of substance Z ? For all trials, only 250cm3 of distilled water was used.

    • Word count: 3039
  3. To determine the standard enthalpy of formation of Magnesium Oxide using Hess Law.

    This is because he stated that according to the law of conservation of energy, the total enthalpy change of a reaction will depend only on the difference between the enthalpy of the product and the enthalpy of the reactants and not on what path it follows. This is known as Hess?s law. The alternate set of stepwise reactions that were followed in this experiment to arrive at the value for the enthalpy of formation of MgO(s) are as follows: 1.

    • Word count: 6121
  4. Reaction Rate

    infers that the rate of reaction is impacted by how often molecules collide with one another. This can be applied to my hypothesis to suggest that with the occurrence of more collisions in the reaction- due to a higher percentage of particles in the more concentrated H2SO4 solutions- it will result in the formation of more bonds and hence, lead to a quicker rate of reaction between two reactants, leading to a quicker production of 20mL of H2 gas. Macintosh HD:Users:160161:Desktop:Screen Shot 2015-03-22 at 2.41.05 pm.png VARIABLES The independent variable (the variable being changed): The independent variable is going to be the varying concentration- measured in molarity mass (M)- of Sulfuric acid (H2SO4)

    • Word count: 3043
  5. What are the Solutions for Acid Rain?

    The acid rain will reduce the life span of the aquatic animals and plants; as when the acid rain drains into rivers and lakes it will lower the pH of the water. Many forms of water life are sensitive to the pH of the water and cannot survive if it is too acidic. (Riley). In a social perspective, acid rain can also affect our health. As the sulfate and nitrate particulates from the dry decomposition can cause asthma, bornchitis problem and weakens the respiratory system (Dowdey).

    • Word count: 1679

Whilst Chemistry is a universal science, studying it at IB is quite different from other courses. The most distinctive difference is that it has considerably more breadth in the coverage of topics. The 11 topic core include: Quantitative Chemistry, Atomic Structure, Periodicity, Bonding, Energetics, Kinetics and Organic Chemistry.

The seven optional topics include modern analytical chemistry, human biochemistry, medicines and drugs, food chemistry, chemistry in industry and society, further organic chemistry and environmental chemistry. You'll be expected to become adept at practical laboratory work, data collection and manipulation, and build a strong scientific awareness. External assessment consists of three written papers, which you may find easier to face having accessed the Marked by Teachers collection of IB Chemistry essays. Internal assessment, which makes up 24% of the marks, consists of an interdisciplinary project, a variety of short and long-term practical investigations and some subject-specific projects.


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