Arnold K H Tan's answer to Angel's Secondary 4 E Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Arnold K H Tan
Arnold K H Tan's answer
2137 answers (A Helpful Person)
1st
Hydration:
Ethene from cracking of naphtha
Rate of reaction: fast (hours)

Fermentation:
Sucrose (sugar) from sugarcane
Rate of reaction: slow (days to a few weeks)