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secondary 4 | Biology
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Hui Ling
Hui Ling

secondary 4 chevron_right Biology

* Chemistry *
Help for qn2 ( b) !! Pls explain how to do it too >< like if there's any formula or anything >< Thank you very much !!

Date Posted: 6 years ago
Views: 457
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KOR ZHI HENG
Kor Zhi Heng's answer
63 answers (A Helpful Person)
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KOR ZHI HENG
KOR ZHI HENG
6 years ago
air contains 21% Oxygen gas, mind my english in the photo hahaha
Hui Ling
Hui Ling
6 years ago
Thank you very much for your help!!
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Arnold K H Tan
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2155 answers (A Helpful Person)
Knowledge from the topics Air and Metals is required.
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Arnold K H Tan
Arnold K H Tan's answer
2155 answers (A Helpful Person)
Note: 21% oxygen in air is the safer number to use, as its explicitly mentioned in the syllabus, although 20% is still accepted too. Download the latest syllabus from www.seab.gov.sg for all your subjects.