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Acids and Bases 1. Which one of the following can be added to lemon juice to increase its pH? A lime juice B baking powder C concentrated hydrochloric acid D ethanoic acid 2. Which one of the following can react with both acids and alkalis? A sulphur dioxide B carbon monoxide C zinc oxide D sodium oxide 3. Which one of the following has the highest pH? Aqueous ammonia is a weak alkali while sodium hydroxide is a strong alkali. A 1.00 mol/dm3 aqueous ammonia B 2.00 mol/dm3 aqueous ammonia C 1.50 mol/dm3 sodium hydroxide D 5.00 mol/dm3 ethanoic acid 4. Which one of the following acids require the largest volume of 1.00 mol/dm3 potassium hydroxide to neutralize? A 1.50 dm3 0.20 mol/dm3 HCl B 1.00 dm3 0.50 mol/dm3 H3PO4 C 1.00 dm3 1.00 mol/dm3 HCl D 1.00 dm3 1.30 mol/dm3 CH3COOH 5. What volume of 1.00 mol/dm3 rubidium hydroxide, RbOH, is required to neutralize 25.0 cm3 of 0.500 mol/dm3 hydrochloric acid? A 12.5 cm3 B 25.0 cm3 C ...
**This article is written by O level Chemistry tutor - Mr Chong. This article is suit able for those in Secondary 3 / 4 and those taking iGCSE.** Hi all, Thank you for viewing this blog for the past months and I welcome you if you are a new viewer. I have closed this post and started a new blog post titled “Tips for 2025 students” You may just read up on a few of the topics I mention below. The more reading you do, the more confident you are in the O level Chemistry exams. It should be a consolation, that your O level exams are likely going be easier than your prelim exams; but this is no time to let down your guard. The most important thing now is to work on your weaknesses and not let the examiners exploit them. My students sometimes beat about the bush but do not answer the questions with the critical key word s; so please know what answering style is expected. Hi, do not worry if you have tuition with me, that I will ask you t...
[Updated in Feb 2025] Hi all, Welcome to my international Chemistry blog. . :) You are free to look around and find information that you may use in your course of study. My O and A levels Chemistry blogs have hit more than 1 million pageviews. Thank you readers for your support!! I am so happy and humbled by this experience. I am honored to serve you as we continue on life's journey.. For 2025 Secondary 3 students under the new Chemistry syllabus, students may wish to get a hold of the older Chemistry Matters 2nd edition written by Tan Yin Toon, because the latest 3rd edition textbook by Marc Chang and other authors, is not written as rigorously as the 2nd edition. Students may like to refer to the 2nd edition Chemistry Matters textbook if the explanations in the 3rd edition are not lucid. Students who read the latest Chemistry textbook may like to read it when they are on a full stomach, because this textbook has many references to food. ...
:) Very HELPFUL :))
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