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Practice Paper 1 examsfree27 February 2020

As you teach the course your students should gain plenty of practice at answering multiple choice questions on each topic from the many example tests on Multiple choice tests for each topic. These will... more

Genuine examples of moderated IA reportsfree26 January 2021

This page explains in great detail through a webcast how three different genuine IAs (two databased and one hands-on) are marked and moderated. The IAs are supplied so, if you wish, you can mark them... more

Complete course for studentsfree10 January 2020

The purpose of this section is to provide complete syllabus coverage specifically for students who have been signed up to student access by their teacher in a subscribing school. Once your school has... more

Novel uses for the IB data booklet free11 March 2021

As well as providing essential data, the IB data booklet can be used as a great teaching aid to introduce and reinforce some of the fundamental concepts covered in the course.The IB chemistry data booklet... more

Ionic bonding & structure23 November 2020

Something that always amazes me is how, having literally just covered Topic 3 on Periodicity, teachers and books seem to forget all that they have taught on that topic when they introduce ionic bonding.... more

Gaining full marks for a databased IA free8 February 2021

I've made this a free page so that any IB chemistry teacher can access it for educational purposes. The page has two very different functions. You can use it to show your students how to write their IA... more

The Nature of Sciencefree2 March 2021

I received an e-mail from a student (not someone I teach) which included the following:"Since I am new to the IB, could you tell me what has been the toughest topic for students generally in the exams... more

Databases25 February 2021

Students are expected to perform at least one exercise using a database in order to fulfil Aims 6 & 7 in the Guide. These concern developing experimental and investigative scientific skills including... more

Advice to students (Paper 1)6 April 2019

1. Revision. Go through the syllabus thoroughly checking that you know and understand the chemistry given under 'Nature of Science', 'Understandings', 'Applications and skills' and 'Guidance' for each... more

MC test: Electron configuration25 August 2017

Use the following 'quiz' to test your knowledge and understanding of this sub-topic. You will need access to a periodic table (Section 6 of the IB data booklet).If you get an answer wrong, read through... more

IUPACfree8 April 2021

As new substances were discovered or synthesized in the past their names may have been related to the natural substance or place they were derived from. For example, oil of wintergreen and Epsom salts... more

MC test: Nucleophilic substitution7 October 2017

Use the following 'quiz' to test your knowledge and understanding of this sub-topic. You will need access to a periodic table (Section 6 of the IB data booklet).If you get an answer wrong, read through... more

15.2 Entropy & spontaneity28 November 2019

Written specifically for students to provide help and support for the IB Diploma chemistry programme this page provides full coverage of the syllabus content of Topic 15.2 Entropy & spontaneity. It encourages... more

Identification from spectra: Question 20 7 August 2019

Identify compound T from the data (a – d) given and explain how you arrived at your answer.a) Elemental analysis of compound TElementPercentage by massCarbon85.60 more

Misuse of formulas26 March 2020

Students often use mathematical formulas to solve chemical problems in exams and sometimes arrive at the wrong answer. This page looks at why this is so and encourages students to work always from first... more

MC test: Electrons in atoms25 August 2017

Use the following 'quiz' to test your knowledge and understanding of this sub-topic. You will need access to a periodic table (Section 6 of the IB data booklet).If you get an answer wrong, read through... more

MC test: Electrochemical cells (AHL)27 September 2017

Use the following 'quiz' to test your knowledge and understanding of this sub-topic. You will need access to a periodic table (Section 6 of the IB data booklet). You may find a calculator helpful to answer... more

NOS & Critical Thinking9 June 2020

In order to think critically in chemistry a knowledge of both chemistry and the nature of science is required. This page gives a simple example of this then provides a full worked example you can give... more

MC test: Further aspects of covalent bonding3 September 2017

Use the following 'quiz' to test your knowledge and understanding of this sub-topic. You will need access to a periodic table (Section 6 of the IB data booklet).If you get an answer wrong, read through... more

Understanding and using ΔG 7 October 2019

ΔG is the change in free energy for a chemical reaction. If it is measured under standard conditions then it is known as the standard free energy change and has the symbol ΔG⦵. If the value of ΔG⦵... more

Topics 10 & 205 July 2020

1. Hazard symbolsAs many goods are transported around the world it obviously makes sense that there are international agreements on the use of Hazard Symbols for potentially dangerous chemicals (many,... more

MC test: Hybridization6 September 2017

Use the following 'quiz' to test your knowledge and understanding of this sub-topic. You will need access to a periodic table (Section 6 of the IB data booklet).If you get an answer wrong, read through... more

Hydroxychloroquine & IB Chemistry3 June 2020

Hydroxychloroquine has been very much in the news recently as it is a medicine that is being controversially taken by some people both as a preventative and as a treatment against Covid-19. After a brief... more

The Culture of Chemistryfree16 January 2021

To do full justice to chemistry, it needs to be set in its wider context. We need to give some indication of its relationship to other subjects and activities, and of the various considerations that enter... more

Creating student accounts free27 August 2019

Beneath your name on the home page you will see 'My account' and 'Student access'.Note that you can gain student access from any page (not just the home page) simply by clicking on the arrow by your name... more

Understanding hybridization4 May 2020

The theory of hybridization is developed by first considering how atomic orbitals combine to form molecular orbitals which then leads on to how hybrid orbitals are formed. The relationships between shapes,... more

School closures and distance learningfree5 March 2020

With the spread of the Covid-19 virus, schools in more and more countries are having to close temporarily and teachers are engaging their students in distance learning. This page gives you some tips... more

How the elements were namedfree5 January 2020

This page is really a book review but it is very relevant to teaching the Nature of Science with particular reference to chemistry. The book, Antimony, Gold, and Jupiter’s Wolf written by Peter Wothers... more

20.1(1) Nucleophilic substitution free27 November 2018

Written specifically for students to provide help and support for the IB Diploma chemistry programme this page provides full coverage of nucleophilic substitution, the first part of the syllabus content... more

Convergence limits1 October 2018

In sub-topic 12.1 Electrons in atoms underneath 'Applications and skills' it states "Calculation of the value of the first ionization energy from spectral data which gives the wavelength or frequency... more

Manipulating equilibrium constants 27 February 2020

The importance of the relationship between the equilibrium constant and the balanced stoichiometric equilibrium reaction it relates to is stressed. What happens to the value of the equilibrium constant... more

Ammonium nitrate & IB Chemistry9 September 2020

Ammonium nitrate has been very much in the news recently after 2750 tonnes of the salt which were being stored in the port area of Beirut caused a massive explosion on 4 August 2020 killing and injuring... more

The electron configuration of scandiumfree21 January 2021

The IB accepts either [Ar]4s23d1 or [Ar]3d14s2 as the correct electron configuration for scandium. This page is based on an academic paper I have recently had published in Foundations of Chemistry that... more

Factors affecting the rate of nucleophilic substitution reactions27 February 2020

This page explains how the nature of the halogen, whether the halogenoalkane is primary, secondary or tertiary and the choice of solvent can all affect the rate of substitution reactions of halogenoalkanes... more

Understanding the activity series10 September 2019

There can be considerable confusion for standard level students over the position of certain metals in the activity series given in Section 25 the IB data booklet. One of the understandings in the IB... more

Short cut to give students access to a pagefree9 March 2020

The site now has a new feature which enables you to quickly give (or take away) student access for those pages over which you have control as to whether or not they are accessible by students. Using this... more

How useful are oxidation states?25 October 2018

Paradigm shifts often occur when an established theory has to be ever more distorted to account for observable facts and to make accurate predictions. I wonder if the time is coming soon when the concept... more