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.

Deduce Total Pressure on Mixing of Gases

240207 question

When we have a few gases at different volumes and pressures, it is less straight forward to find the final pressure.

We can start with summing up the number of moles, since we know that the moles of gases in bulbs R and S will add up to the total moles of gas in the final mixture.

240207 total moles

We can use the ideal gas equation and write the terms in terms of moles.

240207 ideal gas equation

We can then substitute moles of R, S and total moles in terms of pressure, volume, gas constant R and temperature.

Since R and temperature are constant, these terms can cancel to give an expression in terms of pressure and volume.

We can then determine total pressure to be 125 kPa.

240207 calculation

Hence answer to this question is option D.

240207 answer

We can memorise the following formula to determine final pressure when 2 gases with different pressure and volume are mixed together under constant temperature.

240207 formula