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Resources used for the Chemistry notes 
msjchem.com
mrwengibchemistry.com
kognity.com
Steve Owen, ‘Chemistry for the IB Diploma 2nd Section’, Cambridge International, 2014
isbn 978-1-107-62270-8
Catrin Brown, Mike Ford, ‘Higher Level Chemistry 2nd Edition’, Pearson, 2016
ISBN 9781447959755
Photo: “Stomach Acid Test.” Ucsfhealth.org, 25 Mar. 2020, www.ucsfhealth.org/medical-tests/stomach-acid-test.