Combustion kept simple

When teaching about combustion, we must remember to consider 'complete' and 'incomplete' combustion. During complete combustion, the fuel will produce CO2 and H2O. Incomplete combustion produces CO or C (soot). A neat way of showing this to your class is to just use a bunsen burner. With the air hole closed, explain that the smoky, yellow flame is caused by incomplete combustion - the soot can be collected by placing a cool beaker of water under the flame. Opening the air hole allows complete ...

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 1

  Today we will look at Design aspect 1. This criteria is really split into two parts - the research question and the variables. To obtain a 'c', the student needs to produce a focused research question. A research question along the lines of 'How does  concentration effect cell voltage?' would not be considered focused enough - this would be awarded a 'p'. A more focused question would talk about 'How do concentrations of 0.1, 0.2, .0.3, 0.4 and 0.5 mol dm-3 copper sulfate ...