Assessment
Processing uncertainties
When you conduct an experiment, you are likely to have recorded a number of different uncertainties that will need to be combined or processed to give a total uncertainty in the final answer. There are...
Assessment
Significant figures
The digits in your measurements that have been measured and found to be the values as recorded are significant figures (or significant digits). That includes zeros if they have been measured and found...
Assessment
Accuracy and precision
There is a saying in Votic (a language close to extinction found in the Kingiseppsky region of Russia) Kem kḛrtā, mittā, sīz leikkā, meaning measure thrice, cut once. A similar proverb appears in several...
Activities
Understanding & using logarithms
Since all IB Diploma students study mathematics this page should not be necessary, but you may still need some help with using logarithms. This page explains what they are and how you can use logarithms...
Activities
Use of SI units & prefixes
A brief history of SI units and how they are now defined is followed by the seven basic units. This leads on to the derived SI units used in chemistry and the use of prefixes for small and large values....
eBook
Short-answer questions: S2.2 (AHL) The covalent model (2)
only: This page contains short-answer questions on S2.2 (AHL) The covalent model (2) together with the worked answers for each question. Like the multiple choice tests (but not the practice quizzes) these...
Teaching, learning & resources
Teaching students to think critically
The ability to think critically is a key part of the IB Learner profile. This page defines critical thinking and provides examples of critical thinking in chemistry from a variety of different types of...
Start here
Critically analysing IB questions for errors
This page provides ten questions where you can test and improve your critical thinking skills in chemistry. The questions mimic those that have appeared in AI generated tests or on actual IB exam papers...
Activities
Significant figures and scientific notation
The importance of significant figures and how to apply them correctly is covered along with the correct use of scientific notation. You may lose marks in your Scientific Investigation (and your Extended...
eBook
Linking the topics to copper(II) sulfate
This worksheet uses copper(II) sulfate to ask you questions which link it to many different areas of the syllabus. The links cover both ‘Structure’ and ‘Reactivity' and also ‘Tools’. At the end some examples...