# [J1] Lesson 32 (Wave Motion + Applications of Integration + Arenes Part 1)

[J1 Physics PMCians] Wave Motion Part 2 – Polarisation

What we did in 2 hours:

This week, we reviewed the topic of waves, and recapped on Intensity.

We then went on to the last segment of the topic – Polarisation.

Demonstration on the effects of Polarisation

What you take home:

Wave Test C (Solutions)

For reference only.

https://tinyurl.com/y3abfqjs

Wave Motion Daily Dose

The answers and working are at the back:

https://tinyurl.com/y4dvnpnp

Special Mention:

Next lesson, we will begin our Revision for Mechanics, and prepare for the Promotional exam!!

Wishing everyone a wonderful and memorable National Day celebration, and a blessed time with your loved ones!

From you friendly tutors,

Mr Sim & Mr Kwok 🙂

[J1 Maths PMCians]

What we did in 2 hours:

From Techniques, we move on to Applications of Integration. Recall how we used Integration to find the area under the graph and apply them at H2 level of Integration Techniques, including new formulae, standard forms, integration by substitution and integration by parts.

Additionally, we looked at how this is applied to graphs given parametrically. Recall all 3 replacements to be made and practice doing so smoothly. Also, do not forget the good habits to have when sketching a parametric graph on the GC!

Lastly, we were introduced to finding the volume of revolution formed when an area under the graph is rotated fully about the axis. The focus here was on getting familiar with the formula and concept, we will be building up more on this shortly!

What you take home:

The Daily Dose and Try-It question worked solutions are linked here:

https://tinyurl.com/y4yplmof

Special Mention:

We look at more cases involving volumes of revolution and apply them to exam-style Integrated Questions.

See You and Stay Healthy!

[J1 Chemistry PMCians] Mastering Electrophilic Reactions

What we did in 2 hours:

We have revised the reactions of alkenes, paying attention to the four electrophilic addition reactions and two oxidation reactions (mild and vigorous). We revised the two key features of the electrophilic addition mechanism (Markovnikov’s rule and racemic product mixture) as well as predicting the products of vigorous oxidation of alkenes.

We then moved onto the next functional group on Arenes. We discussed thoroughly the resonance structure of benzene, describing clearly their key advantages over the Kekule structure. The structure helps us to understand nicely why benzene rings undergo electrophilic substitution reactions, and described 3 of such reactions.

What you take home:

The solutions to Everything you need to know series and selected structured questions for Alkenes are found here:

https://tinyurl.com/y4y5yza9

Special Mention:

Next week, we shall review benzene ring reactions, as well as to deal with a variant of benzene ring, the methylbenzene molecule.

Do remember to bring your Secrets Enclosed and Last Lap to Promo Workbook, as we begin our revision!

See you in class!

Mr Leong

REDEEM A FREE TICKET FOR YOUR FRIEND 🙂

We are pleased to inform you that you will be able to redeem a free ticket for your friend to attend lesson with you. You may redeem this ticket via your Student Portal, under Referral and Rewards.

Take note:

• This ticket can only be redeemed once.
• The guest must attend lesson either onsite or online with you at the same timeslot.
• Free ticket only applies to non-PMC students who have never attended any PMC lessons before.
• Redemption period strictly before 31 August 2020. See you!