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33 responses
Hi there, my question is in reference to paper 0620/43/m/j/18, Q no 6 part c iii); why does HClO3 disassociates in water as H3O+ and ClO3-, instead of H+ And ClO3-. Also, can u tell me which acids and alkalis partially disassociates and fully disassociate to form ions? Also in 0620/63/m/j/18,Qno 3part e), can the answer be ester instead of fuel as they r also colourless, pleasant smelling and burn with blue flame.
Thank you
Nawalamir
Hi Nawalamir,
Thanks for reaching us, we are happy to help you!
As you have mentioned it is true that HCLO3 dissociates into H+ and CLO3-, when you completely forget or ignore the aqueous solution. In reality, when the hydrogen cation (H+) is released into water it will be bound to a water molecule through a coordinate covalent bond and forms H3O+. This H3O+ ion is called the hydronium cation. In the acid-base chemistry, both H+ and H3O+ are interchangeable. But, for 0620/43/m/j/18, Q no 6 part c iii) the answer has to be H3O+ since H2O is given on the left-hand side of the equation and the equation has to be balanced. In case if you write H+ the equation will not be properly balanced.
Strong acids (HCl, HNO3, H2SO4, HCLO3, HCLO4, etc) and bases (KOH, NaOH, Ba(OH)2, etc), fully dissociate whereas weak acids (CH3COOH – acetic acid, H2C2O4 – oxalic acid, etc) and bases (ammonia, pyridine, etc) partially dissociate.
Yes, for 0620/63/m/j/18, Q no 3 part e) you will be given marks for writing either fuel or an organic compound.
Hope this helps! We are here for you!
Best Regards,
Chemistry Department
Are all the IGCSE past exam papers to be purchased. I previously downloaded some of their past papers from for free and i really hope those ones are not bogus. is their one particular place i am supposed to download the past exam papers from and are all others websites concerning this fake.
Hello there,
You may download past exam papers here: https://www.skolatis.com/cambridge-igcse-past-exam-papers/. They are updated until the March 2020 series. Furthermore, there’s no purchase needed to download the past papers.
Thank you.
Are you still posting these free lessons. if yes, then i have already subscribed to it. how do i get informed on when these videos are going to be published.
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Are you still posting these free lessons?
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where do I go to attend this session
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The short video tutorial is now uploaded. You can start leaving your questions and our subject matter experts will provide A* answer in the comment section.
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I want to inquire the topics n length of the course.
Exactly at what Dubai time the QA session started?
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We will cover one topic every session. This week’s topic is about the Periodic Table. There will be short videos (within 5 to 7 minutes) about the topic and you get to ask our subject matter expert questions relating to the topic.
The free course will start on April 25 9AM GMT and the comment box will be closed for questions on April 25 23:59 GMT. Answers will be provided the next day at 9AM GMT.
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I would like to be a part of this
Hi Feba,
We thank you so much for your interest.
The free course will start on April 25 at 9AM GMT. Once it is live, you will be able to watch short video tutorials (within 5 to 7 minutes) and you get to ask our subject matter expert questions relating to the topic. You may send in your questions until April 25 23:59 GMT. Answers will be provided the next day at 9AM GMT.
We suggest that you convert GMT to your local time using google. For example, please type in 9AM GMT to xx time. Replace xx with your country. Then you will see what time it will be in your country.
You are also free to apply to our Scholarship Programme. The winners will get 80% scholarships to our renown A* Revision course. Please kindly read this page for more information: https://www.skolatis.com/a-revision-course-scholarships-for-november-2020-examination-series/
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Does paying the 70 pounds per month unlock one course or all the courses
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Our normal monthly subscription fee for one course is £75/month. But here we are giving a special discount and you need to pay only £63.75/month for one subject. Sign up soon and remember to enter the coupon code “SPECIAL15” to get the discount.
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I want to be updated on free online chemistry Q&A program.
Hello Kolawole,
Thank you for your interest.
The free Chemistry course will start on April 25 9AM GMT. There will be video tutorials and you get to ask our subject matter expert questions related to the topic. This is a limited time offer as the comment box will be closed for questions on April 25 23:59 GMT.
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