See Where Each English Word Came From! - πŸ“š Etymology

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 Why in the word "chemistry" CH is pronounced as K?

Because it is a Greek word!

CH - CH - Native English words
Cheese, 

CH - SH - French words
Chanel, champagne


CH - K - Greek word
Chemistry, chaos

  >>>>>>  https://www.etymonline.com/

EtymOnline is a pleasant to use, and very useful web site

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