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.

How Changes in Pressure and Temperature affect POE

Let Chemistry Guru, Singapore's esteemed A Level Chemistry tuition centre, guide you through our discussion question this week!

221205 question

We want to deduce how increasing pressure and temperature affect the colour of an equilibrium mixture of NO₂ and N₂O₄.

Let us first recap Le Chatelier's Principle learnt in Chemical Equilibria.

221205 LCP

Le Chatelier's Principle states that if a system in equilibrium is subjected to a change which disturbs the equilibrium, the system will respond to reduce, counteract or oppose the effect of the change partially.

For a more detailed discussion of how changes in concentration, pressure, temperature and adding catalyst affect the system, check out this video lesson.

Let's apply what we know to determine how this NO₂ and N₂O₄ system will respond.

1. Increasing Pressure

221205 increase pressure

When pressure increases, position of equilibrium will shift right to favour the formation of less moles of gas in order to lower the pressure.

Concentration of brown NO₂ will decrease and concentration of colourless N₂O₄ will increase.

Hence colour of the system will become lighter.

2. Increasing Temperature

221205 increase temp

When temperature increases, position of equilibrium will shift left to favour the endothermic reaction in order to absorb excess heat and lower temperature.

Concentration of brown NO₂ will increase and concentration of colourless N₂O₄ will decrease.

Hence colour of the system will become darker.

Therefore the answer to this question will be option C.

221205 answer