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  1. Z

    Chemo P5 tips

    If the percentage difference between the measured value and the true value is more than the maximum apparatus error, this means the experimenter's technique needs modification. If not, the error could be considered to be entirely due to the intrinsic error or the apparatus used
  2. Z

    Chemo P5 tips

    Guys, please post additional tips as well as questions. Let's make P5 easier!!!!!!!!!!
  3. Z

    Chemo P5 tips

    For question 2, explanation in O/N 2010 ER is the best ever: The ER states: Two points about data tables are common every session. Firstly, candidates need to label each new column used. These labels require three items – a written label, a correct unit and an expression to be used to...
  4. Z

    Chemo P5 tips

    During magnesium and hydrochloric acid experiment, to avoid loss of gas do not start the experiment by dropping a piece of Mg in the container of acid!!! Rather, use a divided flask (I would appreciate it greatly if someone explains what that actually means) or place a test tube containing the...
  5. Z

    Chemo P5 tips

    If you want to collect water vapour as water droplet, collect the vapour in a beaker placed in ICE BATH
  6. Z

    Chemo P5 tips

    If you want to flush oxygen out of a system, use an inert gas that doesn't oxidise . Very useful when we are conducting a reduction experiment of metal oxides
  7. Z

    Chemo P5 tips

    We do not need to measure the mass of a reagent or volume of reagent that is in excess
  8. Z

    Chemo P5 tips

    Distillation is a great way of determining boiling point of a liquid Melting point can be measured using a Mel Temp
  9. Z

    Chemo P5 tips

    For filtration: 1. If you require a great separation , use a fluted filter paper 2. If you require a quick filtration, use vacuum filtration
  10. Z

    Chemo P5 tips

    Titration is accurate because: 1. Standard solution of acid/base is used 2. we obtain concordant titres 3. % error in pipette and burette is very small 4. The end point of a titration is sharp
  11. Z

    Chemo P5 tips

    When preparing a solution of a fixed concentration from a given parent solution of concentration , say, 2.0 mol/dm3 A. We are required to prepare a solution of concentration of 1.0 mol/dm3 with volume 250 cm3 ( the concn cannot be greater than 2 !!!!!!!!!!!!!!) a. Add 100 cm3 of the parent...
  12. Z

    Chemo P5 tips

    We are also regularly asked to measure enthalpy changes Most of us already know that we use a plastic cup and thermometer for this purpose However this has many disadvantages (asked regularly) and here are some of them with the required measures: 1. Heat loss to the surroundings from the...
  13. Z

    Chemo P5 tips

    When you have to remove moisture from : 1. Surface: Wash the surface with a stream of propanone. The water gets dissolved in the propanone and repeat it multiple times. Then gently heat the surface to evaporate the propanone from the surface 2. Vapour: Use dessicants such as: 1. ANHYDROUS...
  14. Z

    Chemo P5 tips

    How to prepare crystals (which is also linked with solubility) Many methods are mentioned in MS but I found this to be the simplest: CIE usually demands us to prepare crystal after preparing a saturated solution of the crystal. So, we have to prepare a saturated solution first: 1. Take a fixed...
  15. Z

    Chemo P5 tips

    When using a magnesium ribbon or any dirty surface, clean it with SANDPAPER
  16. Z

    Chemo P5 tips

    The points are coming in a random way, so there is not going to be any particular pattern of my posts
  17. Z

    Chemo P5 tips

    3. While heating crystals strongly, do not use a simple test tube or any apparatus with sharp edges as they are liable to crack at the sharp edges. For very strong heating to a constant mass, a crucible placed on a pipe clay triangle is appropriate. And of course to measure the mass of the...
  18. Z

    Chemo P5 tips

    2. Always while measuring volume of solutions, use burette or pipette because they have low PERCENTAGE error. The question of percentage errors are usually asked in P5. The percentage error becomes very unacceptable if we are measuring SMALL volumes of solution or small masses. So, a 3dp...
  19. Z

    Chemo P5 tips

    Okay guys, just over with P5. Let me put down whatever I understood from the P5s of M/J 2002 to O/N 2010 into words. Hopefully someone can correct me when I make mistakes and yeah add to what I have written (of course!) For planning section: 1. When asked to draw a diagram, ALWAYS mention the...
  20. Z

    CHEM P5 RATIOS!!

    What we get is how much mass of MgO is formed by complete oxidation of a given mass of Mg. From that you can find the number of moles of O is a mole of Mg and this will give you the formula of magnesium oxide.
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