MOF – 177

MOF - 177 has such an unassuming name. What is it though? A star? They have odd names like this don't they? Well no, MOF - 177 is a crystal with a huge (I mean huge) surface area - 4500 m2 per gram. To put this into context .... .... it is the equivalent of 17 tennis courts - per gram. By NielsF (Image:Tennis.png by ed g2s) [GFDL (http://www.gnu.org/copyleft/fdl.html), CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/) or CC BY-SA 2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/2.5-2.0-1.0)], via Wikimedia CommonsThe crystal has a ...

Conclusion and Evaluation Aspect 3

By Thursday, November 11, 2010 , , , , 0

  Today we look at the last IA criteria - Conclusion and Evaluation (CEv), aspect 3. Recall that for CEv, apsect 2, the exerimental method is critically evaluated. For aspect 3, realistic improvements must be stated. Students should aim to improve every fault in the method that they evaluated for CEv aspect 2. The improvements should be realistic and straightforward. If they cannot realistically (easily) make an improvement they should clearly state this fact. Sometimes, it helps students if the present CEv aspect 2 ...

Design, aspect 3

By Monday, November 1, 2010 , , , , 0

Today we will focus on Design, Aspect 3. In order to achieve a 'c in this aspect, the student must write a detailed method. The emphasis is on the word detailed. The student should essentially be able to give another IB Chemist the method and they would be able to carry it out. Often, methods are not detailed enough. For example, in a cell reaction lab the student writes 'connect the voltmeter and record the voltage' - there is not enough detail ...

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 ...