STPM Chemistry Channel

S1 question (Hard question) It is known that when 2 pieces of clean metals contact with each others, the metals will joined together without fusion or heating required and it is called as cold welding. This phenomenon usually occurs in space but not on earth and it leads to some mechanical problems in early satellites. Explain why this phenomenon occurs in space but not on earth.

S1 question

S3 question

S3 question

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Which of the following is true about hydrocarbon?

Errata correction of the book are included in this pdf. Please have a check for it and manually fix the error in your physical book. Wish you all have a good experience in learning S3 chemistry.

Dear Teachers and Students, Thank you very much for your support of our book, Express STPM S3 Chemistry @ A Plus Publication. We are committed to producing a reliable, accurate, and high-quality resource to help STPM students excel in their examinations. As part of this commitment, we would like to share the latest errata and enhancements for the book. Please update your copy by referring to the pages and sections highlighted in yellow. We sincerely apologise for the errors and oversights in the first edition. We greatly appreciate your understanding and valuable feedback, which have helped us improve the book. We are committed to ensuring that the second edition, which will be published next year, will be an even better and more refined version. Thank you once again for your continued support. GOH, CHAN & YAP @ A Plus Publication

Achievement of Team Malaysia at the 58th IChO Uzbekistan 2026 Adib Fahmy bin Awang: Honorable Mention 💪👍 Chang Xiao Jiun: Honorable Mention 👍💪❤️😘 Congratulations to both of you!

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K3M 2026

Hi guys, this is the registration information for K3M (Kuiz Kimia Kebangsaan) 2026. It is a high-level chemistry quiz that requires a strong understanding of the chemistry field. If you manage to become the top scorer, besides receiving the award, you also have the chance to be selected to represent our country in the IChO (International Chemistry Olympiad) 2027, which is expected to be held in Taipei, Taiwan. I will be there as well. For any questions about it, do not hesitate to contact me; I will try my best to assist you.

S2 question (Forwarded) It is known that for decomposition of 3.0 mol of dinitrogen tetroxide in 2 dm² vessel at 1°C, the initial rate is 6.75x10³ mol dm⁻³ s⁻¹ and for dimerisation of 1.5 mol nitrogen dioxide in 0.25 dm³ vessel at 0°C, the initial rate is 0.0720 mol dm⁻³ s⁻¹. The activation energy for forward reaction and backward reaction are 57.2 kJ mol⁻¹ and 57.0 kJ mol⁻¹ respectively. Determine the value of rate constant for forward reaction and backward reaction at 25°C and hence, determine the value of K꜀ and Kₚ at 25°C.

This is the sample of the STPM S3 Chemistry reference book. To be honest, I think this is the best available S3 chemistry reference book in the market, made by highly experienced teachers with deep understanding for the answering techniques as well as marking scheme and former STPM student who is enthusiastic. Highly recommended.

This exercise book (model papers) will be available in June/July. It was designed by a team of experienced STPM teachers in collaboration with former high-achieving and enthusiastic STPM students who are currently studying at local and overseas universities. We strongly believe that this book can help you score an A in STPM Semester 3 Chemistry. Please support genuine original copies. Thank you.

Im involved for designing part of this exercise book. I believe that it will be useful for both students and teachers to cope with new exam format for S3. Wish you guys have a good day👍

S2 Which of the following is true for a reversible reaction N₂(g)+3H₂(g)⇌2NH₃(g) that has achieved dynamic equilibrium?

Hello everyone, We are pleased to introduce a new STPM Chemistry book specifically designed for Semester 3 students, in line with the revised syllabus. This book aims to support effective preparation for STPM Chemistry, with a strong emphasis on conceptual understanding, application, and examination performance. For your information, the book will be available in the second or third week of May. We encourage you to support the original edition for your academic success, as well as to show appreciation for the authors and publisher. Thank you.