Every year since 2008, our annual Pass With Distinction Revision Workshops for all Sec 3 and Sec 4 O-Level Pure Chemistry, IP Chemistry students have helped many to achieve a breakthrough in their Chemistry.

What is covered during the June Holidays?

The following key topics will be covered in the following workshops:

CM 1: Chemical Bonding

CM 2: Acids, Bases & Preparation of Salts

CM 3: Qualitative Analysis

CM 4: Mole Calculations

CM 5: Rate of Reaction & Energy Changes

CM 6: Redox & Electrolysis

CM 7: Organic Chemistry

“I scored an A1 because you told us that it’s not all about doing practices as much as understanding the subject so I think that built up my foundation of Chemistry and that is what made me feel confident about myself when I was doing the O-Level examinations.”

Bryan Ong

Zhong Hua Secondary School, A1 for O-Level Pure Chemistry

How is the workshop conducted?

Designed into workshops with a focused topic(s) coverage, including key essential concepts, application strategies, relationship linkage, easy-to-remember analogies for understanding abstracts.
Our lessons are delivered in an interactive manner: participants are encouraged to take part in questioning and answering in every workshop. This ensures your child learns effectively within the shortest period of time.

O-Level Chemistry students clarifying doubts with Mr Sean Chua

I’m interested, how can I register?

Please call us at 98287357 for more details.

“She can understand your lesson very well and for the first time, she says she likes Chemistry. Thank you for rekindling her interest in Chemistry. She has also expressed her interest in the weekly class.”

Father of Cher Yi Jia

Nan Hua High School, D7 to A2 in 4 months!

Who is the teacher?

Hi, I am Sean Chua, Chemistry Specialist for O & A – Levels in Winners Education.

Being a full-time professional also means 100% dedication, commitment and responsibility to help your child to unlock his true potential to excel in his Chemistry.
Because of my years of experience and expertise, I have been interviewed by the media such as The Straits Times, My Paper, Today and Shin Min Daily papers to provide my opinions and views on education topics. In addition, we have been contributing articles quarterly in Popular bookstore member’s magazines since 2012 to share our experience on examination preparation tips, studying techniques and changes to Singapore’s education landscape.
Many students and parents know me as the invited author for major books publishers in Singapore and I have written more than five titles of guidebooks, assessment books and Cambridge Ten Year Series (TYS). Most of my Chemistry books are adopted by secondary schools and junior colleges as compulsory or supplementary materials.
My academic website, SimpleChemConcepts.com, has been ranked Number 1 on Google for ‘O Level Chemistry tips’ since 2008. In addition, my collection of over 30 Youtube videos has been widely received by local and international students, parents and teachers. Your child will also be able to benefit from the clear, easy-to-understand and concise explanations, just like thousands of our website and video subscribers.

When parents don’t see improvements in their child’s results despite numerous tuitions, when parents see their child struggling with their Chemistry, when parents understand the importance of seeking professional help to assist their child to improve their confidence and results in Chemistry during the critical O-Level or IP Year 4 period,

I am privileged to be the one they turn to for reliability and effectiveness.

They trust my professionalism in always putting their child’s interest as my utmost priority!

Mrs Sim Testimonial of Winners Education. 4 of her children have been attending our O-Level and A-Level classes since 2016

In Electrolytic Cells, electricity is used to produce chemical changes. As such, we say that electrical energy is being converted into chemical energy.

The reverse occurs in Simple Cells (also commonly known as Electric Cells) whereby chemical changes is used to produce electricity i.e. chemical energy is being converted into electrical energy.

Parts of Simple Cells:

A simple cell consists of two solid electrodes placed in an electrolyte connected together by an electrical conductor such as wire.

The two electrodes must be two different metals.

The electrolyte can be acid solution, alkaline solution, salt solution or even a fruit such as orange or lemon.

The voltage produced depends on the positions of the two metals in the reactivity series. The further away the metals are in the reactivity series, the larger will be the voltage.

For example, magnesium/copper electrodes pair will give a larger voltage than zinc/copper electrodes pair.

How does Simple Cells Work?

Let’s use an example of a simple cell to discuss further.

Metal electrode 1: Zinc
Metal electrode 2: Copper
Electrolyte: Dilute NaCl

O-Level Pure Chemistry Tuition class questions, IP Chemistry Electrolysis Dilute NaCl

The metal which is higher up in the metals reactivity series will be preferentially oxidised. It will release electrons more readily and is the negative electrode (known as Anode). In the above example, zinc is more reactive than copper, thus zinc electrode will be the negative electrode.

The electrons leave the zinc electrode and pass through the connecting wires to the copper electrode.

The metal lower down in the metals reactivity series will become the positive electrode (known as Cathode). As such, copper will be the positive electrode. The electrolyte contains positive ions (sodium cations) and hydrogen ions. Hydrogen ions has a higher ease of discharge as compared to sodium ions and will be preferentially discharged (reduced) by accepting electrons from the negative electrode via the wire.

This a a redox reactions whereby oxidation and reduction reactions occurs simultaneously. Electrons is being transferred from zinc atoms to hydrogen ions.

Uses of Simple Cells:

Simple Cells are commonly also known as batteries which provides a portable form of electrical energy. They supply electricity to watches, torches, etc which do not have to connected to the main electricity supply.

YouTube Video Tutorial on Simple cells in Electrolysis

You can watch the YouTube Video below to have an even clearer idea about Simple Cells.

Length of Video: 11.02 minutes

Direct Video Link: https://www.youtube.com/watch?v=MAwJ2wiIBzo

Do understand the difference between Simple Cells and Electrolytic Cells. Every year, I have a large number of students in my O-Level Chemistry Tuition Class and IP Chemistry Tuition Class who told me that they are confused by their school Chemistry teachers and Chemistry tutors with regards to how the two types of cells work. If you have not read my blog posts regarding Electrolytic Cells, you should do a search for them using the search box at the top right hand corner.

I hope you find the content easy for your understanding and that this article will be part of your Chemistry Notes to master Electrolysis topic.

If you have anything valuable to add, leave me a comment below.

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If you are based in Singapore and needs help with Sec 3 or Sec 4 Chemistry concepts, you can join my weekly O-Level Pure Chemistry and IP Chemistry Tuition Classes.

Chemistry Notes & Tips

O Level Pure Chemistry . IP Chemistry June Holidays Intensive Revision Programme