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.

2019 A Level H2 Chemistry Paper 1 Question 9 - Deduce Compound from QA Notes and Periodicity

Here's 2019 A Level H2 Chemistry Paper 1 Question 9.

2019 p1 q9 question

Unknown compound X is split into 2 different substances solution Y and gas Z.

Y and Z are further reacted and the observations are given in the question.

We need to identify the element in Y and the element in Z that will allow us to determine the 2 elements in X.

By considering the options, we know that there is a metal element and non-metal element in X.

The metal element is either Mg or Al, while the non-metal element is either Si or P.

1. Identify element in solution Y

When NaOH(aq) is added to solution Y, a white precipitate insoluble in excess NaOH(aq) is formed.

This test should remind us of identifying metal cations in QA experiments.

Hence we can refer to the QA Notes in the Data Booklet to identify the metal.

2019 p1 q9 deduce metal from QA notes

In this case Mg²⁺ is the metal cation that will form white ppt with NaOH(aq), insoluble in excess.

Therefore the metal element in Y and X will be magnesium, Mg.

2. Identify element in gas Z

The product that we need to focus on is the unknown oxide which is a solid and insoluble in dilute acid or alkali.

Since the metal element has already been identified, the element in gas Z must be a non-metal.

Hence we will need to consider the 2 possible oxides, SiO₂ and P₄O₁₀, and their reactions with dilute acid and alkali.

2019 p1 q9 deduce nonmetal from Periodicity

Both SiO₂ and P₄O₁₀ are acidic oxides hence will not react with dilute acids.

They should both react with alkali, but since SiO₂ is a giant molecule with strong and extensive covalent bonds that are hard to break, SiO₂ only reacts with strong alkali instead of dilute alkali.

P₄O₁₀ will be able to react with dilute alkali via neutralisation.

Hence the non-metal element in Z and X will be silicon, Si.

Finally we can compare the options to determine the answer to be option D

2019 p1 q9 compare options