For all of you lucky IB students out there, the May 2011 exams will be upon you on 9 May and 10 May 2011. The Chemistry syllabus, for both Standard Level and Higher Level, is extremely concept-heavy and thus needs a lot of memorization. If you were in a class like mine, and did not [...Read more...]
NB: This is a satirical piece. Some time later, Lord Tymchak tested Abraham. He said to him, “Abraham!” “Here I am”, he replied. Then Lord Tymchak said, “Take your piece of zinc, your only piece of zinc, which you love, and go to the region of Trololololol. Sacrifice it there as an oxidized offering on [...Read more...]
![Introductory Chemistry Midterm Review](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Chemicals_in_flasks.jpg/220px-Chemicals_in_flasks.jpg")
Sorry about the poor formatting. If you don’t understand something, let us know! Question 10: ENTHALPY OF FORMATION In a thermite reaction, iron oxide reacts with aluminum metal: 3Fe3O4(s) + 8Al(s) → 9Fe(s) + 4Al2O3(s) Using the provided data, calculate the change enthalpy of formation of the reaction. The change in enthalpy formation(kJ/mol) of selected [...Read more...]
Hopefully these notes make sense to you. I was attempting to summarize the entire bonding chapter for Chemistry HL/SL. Chemical bond – interaction between atoms/ions that results in a reduction in the potential energy of the system, making it more stable Bond type (ionic, covalent, metallic) depends on electronegativities Very different EN – ionic (EN [...Read more...]
![The Effect of Electrode Shape on the Electroplating of Copper [Chemistry experiment]](http://upload.wikimedia.org/wikipedia/en/thumb/b/b6/Copper_wire_comparison.JPG/220px-Copper_wire_comparison.JPG)
Here’s a fun experiment that I did with my friend over the holidays just to prove another friend wrong. DESIGN Purpose: To determine if physical deformations (ie. bending, etc.) of the copper electrodes used in the electroplating of copper will affect the amount of copper electroplated. Hypothesis: In electrochemical cells, spontaneous redox reactions convert chemical [...Read more...]
![Effect of Light on Reaction Rates [Chemistry experiment]](http://intensecogitation.info/wp-content/uploads/thumb-cache/063010_1752_EffectofLig1-826f26741b690cfd75dc02a4591f965a-150x200-75-crop.jpg)
Another fun experiment we did to show our teacher that his remarks were indeed false. Design Purpose: To determine the effect of electromagnetic radiation, specifically ultraviolet radiation, on an iodine clock reaction. Hypothesis: The iodine clock reaction is famously known for its sudden colour change which does not occur immediately after the two reactant solutions [...Read more...]
Dynamic equilibrium: Many chemical reactions don’t go to completion Once the products are formed, the reverse reaction may take place to reform the reactants In a closed system with constant temp, the concentrations of all the reactants and products will eventually become constant When the system reaches this state, it is in dynamic equilibrium/chemical equilibrium [...Read more...]