Recent Posts by David Allen

Colorimetry

I love carrying out colorimetry, it is one of my favorite types of labs to carry out and I do believe that as teachers, it is a really underused type of lab and undervalued type of lab. I always teach the theory first, covering the ideas behind the Beer-Lambert Law and the way that a colorimeter works. We will usually start off by getting the class to make up standard solutions of copper sulfate (0.1 mol dm-3 to 1.0 mol dm-3 ...

How do you do it?

Personally, I find section 9.2 one of the hardest parts of the course to teach. It relates to voltaic cells. I can never remember is it left minus right or vice versa, which side is positive, which is negative? In order to help teach this I put together a useful set of ideas / principles that I now use to help my teaching. It does involve some learning / memorization of facts but once these points are learnt, everything else ...

Sigma, Pi, Hybridization and Shape

Sigma bonds, Pi bonds. Shapes of molecules. Hybrid orbitals. How do they all fit together? I was really confused with this information when I was a student. It wasn’t covered when I did my biochemistry degree and I only felt like I really understood things until I started teaching about the concepts … so I really hope this blog post helps your understanding of things. Where do I start? Well, the three above concepts (Sigma & Pi, shape and hybrid orbitals) are, in my ...

Simple Organic Lab Work

I love organic chemistry but am well aware that this view of things is not held by all teachers and students! However, I feel I teach the subject well, but when it comes to lab work I do not do so well and this is something I need to work on. Today’s blog post aims to help me (and you) overcome this fear by giving you an idea for a simple lab to carry out (once you have the necessary reagents ...

End Game

If you are an IB2 student who sits their exams in the May exam session, as the month of March, it comes to an end your thoughts are probably on revision. If your teachers have yet to finish the course, they will probably be almost there. If they haven’t yet finished, don’t let this from stopping you from carrying out some revision! If you didn’t know it, the IB Chemistry exam this year is on Wednesday 22nd May (Papers 1 ...

Supporting Your Students with Revision

At the time of writing, it is only February. I’m still making my way through the course but I am already beginning to think ahead to the end of the course and revision activities for my students. One activity I recently carried out in a teacher workshop involved getting the teachers to familiarise themselves with the syllabus and their perceived strengths and weaknesses. If you like, they carried out an audit of the course. However, in order to carry this out ...

The Year of the Periodic Table

In this post I cover some principles of TOK, NOS and the learner profile whilst focusing on our favourite chemistry friend, the periodic table. 2019 has been officially designated ‘The Year of the Periodic Table’. I often wonder who makes these decisions but this one was made at the highest level, by the UN – so I guess we can’t argue with that! Why 2019 though? Why not 2018, 2020 or another year? Well, the reasoning behind it is that this marks ...

Biochemistry Option: Section B8 Nucleic acids

The nucleic acids section of the biochemistry option now has personal significance for me. Towards the end of last year, I was diagnosed as having type 2 diabetes. This came as a bit of a shock to me. I was not overweight and have a relatively healthy BMI of 23.6. However, after a bit of digging round into my family’s history I found out that on my father’s side of the family, his brother (my uncle), his mother (my grandmother) ...

Diabetes

This section of the option now has significant personal significance for me. At the end of November 2018, I was diagnosed with diabetes. Initially, this came as something of a shock to me. I eat a healthy diet, don’t drink too much and am not overweight (I have a relatively healthy BMI of 23.6). Naturally, the doctors and hospital staff wanted to find out more. There are two types of diabetes, imaginatively titled type 1 and type 2. In simple terms, ...

The Halogens

Topic 3.2 of the periodic table deals with periodic trends. In particular, under the applications and skills section, we are told to 'discuss the similarities and differences in the properties of elements in the same group, with reference to the halogens (group 17).' In this month’s blog, I thought I would share with you my way of teaching this particular aspect of the course. It goes without saying that the halogens are toxic, poisonous and in general pretty nasty. You the teacher ...

Recent Comments by David Allen