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 13 Solution - Exclusive

In this exclusive video we want to discuss the suggested solution for A Levels Chemistry (H2 Chemistry) 2017 Paper 1 Question 13.

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

2017 A Level H2 Chemistry Paper 1 Question 13 Question

The topic tested in this question is on Chemical Equilibria and Mole Concept.

We first start with the K_c expression given in the question.

Since water is pure, the concentration of H₃O⁺ and OH^- are the same, so we can combine these terms together and end up with the following expression:

2017 A Level H2 Chemistry Paper 1 Question 13 Kc expression

Next we rearrange the expression to reference it with respect to concentration of H₃O⁺.

2017 A Level H2 Chemistry Paper 1 Question 13 concentation of H3O expression

Concentration of H₃O⁺ is just the number of moles of H₃O⁺ in 1 dm³ of solution, and concentration of H₂O is the number of moles of H₂O in 1 dm³ of solution.

So we can write the number of H₃O⁺ ions in terms of number of H₂O molecules and K_c expression.

2017 A Level H2 Chemistry Paper 1 Question 13 Number of H3O ions expression

Finally we can express number of water molecules using density (0.997 g cm^-3), volume (1000 cm³), molar mass (18) and Avogadro constant (L) and get the final expression.

2017 A Level H2 Chemistry Paper 1 Question 13 Number of H3O ions working