Useful websites and video

Reaction between potassium and water

https://www.youtube.com/watch?v=oqMN3y8k9So

Egg and vinegar

https://www.youtube.com/watch?v=rIN-5Worgm0

What is Electrolysis

https://www.youtube.com/watch?v=7uIIq_Ofzgw

Simple explanation of the Mass Spectrometer

https://www.youtube.com/watch?v=tOGM2gOHKPc&t=208s

HKEAA DSE Chemistry Info

http://www.hkeaa.edu.hk/en/hkdse/hkdse_subj.html?A2&2&7