Data Collection and Processing, Aspect 3

By Thursday, November 4, 2010 , , , , 0

DCP, aspect 3: Students seem to find this difficult to achieve a 'c'. The aspect is looking for students to correctly present their final answer (to the correct number of significant figures) and to display an uncertainty / error value (to the correct number of significant figures). We will consider each part separately: Firstly, the correct number of significant figures. The student should look back through all the data used in DCP aspect 1. The final answer should have the same number of ...

Data Collection and Presentation, Aspect 2

By Wednesday, November 3, 2010 , , , , 0

Today we will consider DCP, aspect 2. This aspect deals with the processing of the raw data collected in aspect 1. It should involve an 'IB CHEMISTRY type' calculation - it should not be simply calculating averages or calculating 1 / t (for a rate).  The calculation should be demanding enough that an IB Chemist should be able to carry it out (but not another student following another IB subject). If the students carries out the processing of the data correctly, award ...

Design Aspect 2

By Sunday, October 31, 2010 , , , , 0

  Sorry for the delay - I have been on my half term holiday :lol: So, my last posting covered Design, Aspect 1 - today, it is onto Design, Aspect 2. This criteria is all about controlling the variables listed in Design, Aspect 1 in the Method. Your students should cross reference their listed variables in Design, Aspect 1 and write how they will realistically control them. The most common mistake is writing something obscure in Design, Aspect 1 (for example, controlling the room ...

Europium (Eu) and the Moon

Europium is sort silver metal. It was discovered in Paris (hence the name) by Eugene – Anatole Demarcay in 1901. It is found in the rare earth metals or the Lanthanides. Strangely, it is found in moon rock, in much higher amounts than expected. Moon rock also contains to 2+ ion, rather than the 3+ ion found on the Earth. This implies that the Moon was formed under reducing conditions and also, perhaps more importantly, that the Moon and Earth are made ...