What are the different types of JC Chemistry tuition classes available at your centre?

We have 3 modes of learning for students to choose from: weekly physical classes at Bishan; weekly online lessons via Zoom; and on-demand video lessons.

Are you the only Chemistry tutor conducting the classes or do you engage other tutors to do that?

Please be rest assured that I conduct all my classes personally and I do not engage other tutors to teach at my centre.

How well do your students perform after attending your H2 Chemistry tuition classes?

Most of my students showed improvements by at least 3 grades and more than 80% have attained distinction for A Levels. The earlier the students join my classes, the more confident I am in improving their grades.

What is your class size at Bishan?

Usually the class size is around 10 to 12 students. Max class size is 16 pax.

Is there makeup lesson if I miss a class?

Yes makeup lesson is available in the same week subject to availability. If makeup class is not possible, the student can view the recorded video lessons at Google Classroom.

Do you have trial lesson available? How much is it?

Yes we do. Fees for trial lesson are for Bishan class and for Zoom online class.

Does your centre offer O Level chemistry tuition? Do you teach IB / IP chemistry tuition? How about H1 Chemistry?

Chemistry Guru specialises in H2 Chemistry for JC1 and JC2 or IP Year 5 and IP Year 6 students only. Find out all the information about A Level H2 Chemistry and the detailed comparison between H1 and H2 Chemistry. We do not conduct lessons for H1 Chemistry, O Level Chemistry, IB Chemistry or IP Chemistry at IP Year 3 and IP Year 4.

A Level Chemistry 2017 Paper 1 Question 25 Solution - Exclusive

In this exclusive video we want to discuss the suggested solution for A Levels Chemistry (H2 Chemistry) 2017 Paper 1 Question 25.

Let Chemistry Guru, Singapore's top JC Chemistry tuition centre, guide you through this question:

2017 A Level H2 Chemistry P1 Q25 question

The topic tested in this question is on the acidity of organic compounds carboxylic acid, phenol and alcohol.

The acidity and reactions of these compounds with bases are as summarised in the table below:

2017 A Level H2 Chemistry P1 Q25 acidity of organic compounds

From the table we know that:

- carboxylic acid is the strongest acid and can react with Na, NaOH and Na₂CO₃
- phenol is less acidic and can react with Na and NaOH only
- alcohol is the least acidic and can only react with Na

We must always remember that alcohol is a weaker acid than water so therefore alcohols are neutral and cannot react with bases like NaOH and Na₂CO₃.

So we can now conclude that mandelic acid will react with 2 moles of Na due to one carboxylic acid and alcohol functional group.

2017 A Level H2 Chemistry P1 Q25 mandelic acid

Saligenin will react with 1 mole of NaOH due to one phenol functional group. Remember alcohol will not react with NaOH since it is neutral.

2017 A Level H2 Chemistry P1 Q25 saligenin

Finally we can compare the options and decide that the answer to this question is D.

2017 A Level H2 Chemistry P1 Q25 compare options

Check out this video for the full solution and detailed explanation!

Topic: Acidity of Organic Compounds, Organic Chemistry, A Level Chemistry, Singapore

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A Level Chemistry 2017 Paper 1 Question 25 Solution - Exclusive

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