Home of real teaching & learning
- Full support for teachers
- Focus on critical thinking
- Engaging classroom activities
- Integrated student eBook
- Assessed tasks / qBank
- Practice exam questions
The InThinking Guarantee: Our sites are written by expert practitioners and not by AI
See our AI policyDisclaimer: InThinking subject sites are neither endorsed by nor connected with the International Baccalaureate Organisation.
Don't miss out, find out!
- Free trials Take out a one month free trial today!
- Newsletters Subscribe to our FREE subject site newsletters.
Recommendations
Read what users are saying about the site.Site authors
IB Approved Workshops
The Role of the Librarian
IB IB Ed Category 3
Virtual (IB Approved), 25 - 27 September 2026
Find out more
Chemistry
IB DP Category 2
Barcelona, Spain, 12 - 14 February 2027
Find out more
Chemistry: A focus on the experimental programme
IB DP Category 3
Paris, France, 19 - 21 February 2027
Find out moreVirtual Think-Ins
IB Teaching – A Practical Guide for Teachers new to the IB
Virtual Think-In, 20 November 2026
Find out more
Find all InThinking events at
inthinking.net
Quote of the day
Knowledge comes, but wisdom lingers.
![]()
InThinking
Supporting international schools with high quality PD & interactive online resources
Creative
Personal
Selected student pages
See allMost popular
See allBlog
Free
The importance of using clear English in IB chemistry
Why using clear English is important when communicating in chemistry. This blog gives examples of two past IB questions where the language used to phrase the questions can lead to different interpretations...
Recommendations
See all"InThinking has proved to be a great boon for me, as a teacher and my students. The simplification of language, do's and dont's, worksheets with superb questions: appropraite videos/slides; exhaustive guidance on IA as well as EE... you name it !!! Thanks..."
Shalini Sharma
Good Shepherd International School
"As the solo chemistry teacher at an international school, introducing the IB, this site literally "saved my skin" -never felt alone and a wonderful resource. Highly recommended"
Robert Nolan
Internationale Friedensschule Köln
Subscriber comments
-
Mani, Since this is for an IA it is up to the student to decide and to explain in their report. You need to check that what they are doing is safe and and can lead to a good investigation but the student is responsible for devising their own method...
R2.2 (AHL) Activation energy -
Thank you. The temperature does rise 2-3 degrees beyond the desired temp. So, is it valid to do an average?
R2.2 (AHL) Activation energy -
Hello, This is electrolysis of water with H2SO4 in a Hoffmann apparatus. Is there any theory/reseach paper that supports why the graph of rate of electrolyis must be directly proportional to the concentration of H2SO4?
R3.2 Electrochemical cells
Geoffrey
Site authorHi Mani,If this is for an IA I suggest your student searches for "Is the rate of electrolysis dependent upon the concentration of the electrolyte? They will find that there are many articles discussing this.
R3.2 Electrochemical cells