How about another Chemistry Question on Redox Reactions as a food for thoughts over the weekend…

Q) Which of the following conversions is a redox reaction (involves oxidation/reduction)?

A)H+ => H20
B)NO2 => NO3^-
C)SO2 => SO3^2-
D)SO3 => SO4^2-

Enjoy and take care.

Rgds,
Sean
SimpleChemConcept

Popularity: 6%

Hey student,

Here is another one for you to think about. Yup. O Level Prelimary Chemistry question. Think about it and let me know.

Q)A certain quantity of electricity liberates 9g of aluminiun. The volume of oxygen liberated at r.t.p from dilute sulphuric acid by the same quantity of electricity is:

A)6 dm^3
B)8 dm^3
C)12 dm^3
D)24 dm^3

Happy trying. Rmbr: Best thing is to write it down and play around with the equations. You will see the light in the tunnel….

Sean
SimpleChemConcepts

Qn answered and explained under comments

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Q) Since HCL has strong covalent bonds, why is it that they dissociate easily into H+ ions and Cl- ions when put in water?

Answers:

In GCE O Level education, this question is usually not posed. In Junior Collleges, detailed explaination will be given in general chemistry classes.

Suggested Answer:

first of all, we would love to thanks all those who have posted your comments, shared your thoughts, asked your questions

Keep them coming! we welcome all! Since O Level is coming by in 25 days time, we would love to continue to see this blog active. btw, did i mention that there are on average 100 of you viewing this blog daily? not a huge number but both me and sean are happy that there are people who visit this blog. and we will continue to provide you with tips to do well.

Halo all students preparing for your O Level exams,

Do try out the following Chemistry Question from the Top 5 Sec Schools in Singapore during their Preliminary Examinations:

Q) The number of atoms in 25g of Butane is:

A. 3 X 10^23
B. 3.6 x 10^24
C. 4.2 x 10^23
D. 4.2 x 10^24

Do try and send me your answers, probably by the email or leave a comment.

All the Best
Sean
=)

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Pavment Art

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Question:Why no complete answers to qns post?

Answers:

1. Learning isn’t about reading answers;they’re about applying your knowledge to solve the questions.

2. We help students only when they take actions, regardless of the size of the action.Sending an email with the queries is an action taken. Sending qns with personal working is another massive action.

3. We believe that most of you will learn best by knowing yourself first. Knowing and recognising your strengths and weakness are important as you acknowledge them.

So if you want answers/solutions for the questions posted,take ACTION by showing us your working and we revert back to you with comments

As i have mentioned earlier, learning Chemistry is easy when you show aptitude and interest in the subject. Chemistry is happening around us everyday - all the phenomenons.

Below i would like to share with you on a Chemistry Phenomenon that i came across in TODAY papers dated 25th Aug 07.

Title: Did Pigeon Poo Weaken Fallen Minnesota Bridge?

I almost LOL when i read the title of this article. Interesting isn’t it. Corny in a way. But after catching my breath and reading through - it is no corny anymore, it is based on scientific knowledge.

I was coaching this girl who was facing some challenges with a-math; she has never passed her a-math before but the interesting thing is that she was doing all right for her e-math. well, both are math subjects, what are reasons for the difference in performance?

i was curious… pretty curious….

my curiosity was killed one day!

I was asking her a simple qn and she couldnt answer not because she wasn’t smart. in fact, she’s a bright girl…

i was shocked to hear her reason “i didnt bring my a-math exercise book with me, everything is in there, now i can’t remember!”

Yoz All O Level takers,

Hope things are going fine on your side.

First of all, i would like to thank Always Lovely for inviting me to share my thoughts and experiences in the World of wonderful Chemistry, and allowing me to give-back to the academia.

Recently, i have questions asking how to memorise the Metal Reactivity Series - in order to answer numerous questions that require the knowledge of the series. I certainly believed that school teachers would have improvised their own ways of helping you to memorize the series. Some are easy while unfortunately others are tough in way (for some that dont feel connected).