Electrolysis | SimpleChemConcepts

Tag Archive: Electrolysis

O Level Chemistry: Challenging Mole Calculation / Electrolysis Questions

Written on August 14, 2010 by sean in Chemistry Notes & Tips

In the previous post, we have discussed on a MCQ question on Electrolysis that requires students to:

1. Write out discharge half equations

2. Do Molar Ratio Comparisons

Question:

Which of the following requires the least number of eletrons for discharge?

A. 2 mol of Al³⁺ (aluminium) ions

B. 5 mole of OH^- (hydroxides) ions

C. 3 mol of O^2- (oxides) ions

D. 6 mol of H⁺ (hydrogen) ions

Write your Answer and Suggested Working in the “Leave A Reply” section below.

PS: If you are not sure how to proceed, you can refer to the previous blogpost by clicking HERE

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O Level Chemistry: Challenging Mole Calculation / Electrolysis Questions

Written on August 12, 2010 by sean in Chemistry Notes & Tips

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In the previous post, we have discussed on 1 MCQ question on Electrolysis that requires basic Mole Calculations strategy to solve.

Do note that Electrolysis topic is only applicable to students taking:

GCE ”O” Level Pure Chemistry (Code: 5072)
Integrated Programme (IP) – it will be classified under Electrochemistry chapter
IB programme
IGCSE and other equivalents

It is NOT applicable to GCE ”O” Level students taking Combine Science syllabus.

Today, we shall continue to look into another challenging Electrolysis question.

Question:

Which of the following gives the largest number of eletrons for discharge?

A. 4 mol of Al³⁺ (aluminium) ions

B. 5 mole of OH^- (hydroxides) ions

C. 4 mol of O^2- (oxides) ions

D. 10 mol of Na⁺ (sodium) ions

Try it out! Once you have an answer, proceed to click the link below to see if you have gotten the correct answer. Suggested answer and thought process is given also.

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O Level Chemistry: Challenging Mole Calculation / Electrolysis Questions

Written on August 11, 2010 by sean in Chemistry Notes & Tips

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A few students from my weekly chemistry sec 4 classes have been asking me about the following Multiple Choice Questions (MCQ) on Electrolysis, more specifically on Electrolytic Cell.

It seemed like many secondary schools in Singapore had set this question in the recent school’s O Levels Preliminary Exams.

Question:

In an electrolysis experiment, the same quantity of electricity deposited 16g of copper and 6g of titanium.

What was the charge on the titanium ion?

A. 1+

B. 2+

C. 3+

D. 4+

What do you think?

Clue: Although this is question is on Electrolysis, you need to realise that it is calculation-based and you should be thinking of Mole Calculations at the same time.

Work it out on your own, before you click the link below to check the answer and my suggested solution (with thought process).

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Error in Marshall Cavendish GCE ‘O’ Level “Chemistry Matters” Textbook – Part 1

Written on October 17, 2009 by sean in Chemistry Notes & Tips

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Dear GCE ‘O’ Level (as well as IP) students using Marshall Cavendish Chemistry Textbook as reference text,

Please note that there is a printing error in the chemistry textbook (third impression 2008) that many of you did not realised (just like many of my students, until recently).

The error in print is on

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Early Bird Registration: Final Revision ‘O’ Level Chemistry Mastery Workshops

Written on August 25, 2009 by sean in Announcement, Chemistry Coaching

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Hi Students (based in Singapore),

With GCE ‘O’ Levels and IGCSE Chemistry Examinations in 2 months time,how many of you are prepared to score the grades you desire for Chemistry?

Many of you seemed to realise that this is time for you to really sit down and revise what you have learned for the last 2 – 3 years. This can be shown by the number of emails i received from students as well as the numerous comments on the Chemistry questions posted recently in this Chemistry Blogsite.

I am glad you are taking actions! =)

Based on the numerous requests from parents & students, we have decided to re-run 2 of our Chemistry Topical Mastery Workshops this September school holidays, in order to assist you.

If you have missed the workshops during the June Holidays, this is the chance for you to learn it from us again.

And for those that realised that you can’t answer questions related to these topics, I would strongly urge you to join us whatever it takes, due to 3 reasons:

1. High Weightage in Exams EVERY YEAR!
2. Highly Application Topics – No way you can memorise and expect to do well
3. Sure it will come out! No way to escape from it!

Details of the 2 Mastery Workshops as follows:

Mole Calculations Mastery Workshop 2009

(3rd time we are running this year due to overwhelming response)

>> Click HERE for Early Bird Price Registration by 31st Aug 09

Redox & Electrolysis Mastery Workshop 2009

(Back by popular demand and enquiry)

>> Click HERE for Early Bird Price Registration by 31st Aug 09

There is a saying that “80% of the Success is just about Taking the Necessary Actions”.
This is your last chance to help yourself towards Success!

Register early and enjoy early bird savings + bonuses!

If you need any assistance, please call 9685 7675 or 9828 7357

I look forward to seeing you at the workshops!

PS: Seats are limited! Registration will close once seats are filled!

PPS: A-Math Differentiation & Integration Mastery Workshop also available. Click HERE for more info

To Your Academic Success in Chemistry,
Sean Chua
Master Trainer for Chemistry
Winners Education Group

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Successful Completion of June ‘O’ Level Chemistry Intensive Revision Programme

Written on July 2, 2009 by sean in Announcement, Chemistry Coaching, Chemistry Notes & Tips, Tips for Improvement

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Hello everyone,

My sincere apology for missing in the month of June. =)

I was busy with coaching several groups of committed O Levels / IGCSSE / IB / IP students that wanted to improve their Chemistry Concepts (and thus their academic grades) in an intensive manner during the June School Holidays in Singapore. Phew! It’s finally over!

Topics that were discussed included the followings:

Atomic Structure & Chemical Bondings – Basic but Most Important Essential Concepts
Acids & Bases – relate to our everyday life actvities i.e. shampoo, coffee, rainwater, etc
Salts & Qualitative Analysis – Super Memory Techniques & Flow-Charts for effective learning and ease of memorisation
Periodic Table Trends & Metals – discussion on O Level Examination Application Questions
Rate of Reactions & Energy Changes – Applications questions in O Levels Chem Exam. No way you can score well just by memorising definitions
Redox & Electrolysis – a “4-Step System” taught to ensure students will always get the answer correctly with confidence
Mole Calculations – “See-Saw Method” plus other Systems taught to ensure students answer questions confidently & correctly

The above topics will cover about 70 – 80% of the syllabus for GCE ‘O’ Level Examinations.

This Intensive Revision Programme (in which ALL essential concepts were discussed for each topic) was physically tiring but mentally & emotionally fullfilling. The feeling was estatic each time when we finished one workshop (2 topics), when i see students having more interest in the topics and scoring better in the Post-Tests (as compared to their Pre-Tests). I am confident to say that the students leave the workshops with more confidence and desire to score the grades they truly deserved.

You can view the video below on selected photos that were taken:

You can check out the URL HERE.

If you have missed our June Intensive Revision Programme, you can be posted of our upcoming workshops by filling up your details HERE. In addition, we will also be conducting our annual ‘O’ Levels Organic Chemistry Mastery Workshop 2009 in late July. More information will be furnished within the week.

In the next 2 weeks, i will be blogging more on the misconceptions and common mistakes that i observed during this June Intensive Programme. Stay Tuned! =)

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O Level Chemistry June Holidays Intensive Revision Programme

Written on May 11, 2009 by sean in Announcement, Chemistry Coaching, Chemistry Notes & Tips, Tips for Improvement

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I would like to say a big thank you for all of my local and international readers (Students,Parents, Educators) for following my Chemistry blog all these while. It is my joy to receive questions and compliments from my readers, suggesting I have helped them using my expertise in Chemistry some way or another.

This June Holiday 2009, I would like to invite all Singapore students (Secondary 3 and 4) to join me in our annual June Intensive Revision Programme. I would be personally coaching you on the following topics:

Atomic Structure & Bonding (Ionic, Covalent & Metallic)
Acids, Bases
Salts & Qualitative/Chemical Analysis
Periodic Table and Metals
Rate of Reactions & Energy Changes
Redox & Electrolysis
Mole Concepts & Chemical Calculations

For more registration details, click here

It will include

Comprehensive 100% coverage of each topics
Understand abstract concepts in an

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