AS level OCR Chemistry Exam Questions With 100% Verified Answers
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Course
AS level OCR Chemistry
Institution
AS Level OCR Chemistry
AS level OCR Chemistry Exam Questions
With 100% Verified Answers
Isotopes - answerDifferent atomic forms of the same element. Atoms with the same number of
protons but a different number of neutrons
Relative atomic mass - answerThe mean mass of an atom of an element, compared to 1/12th of
the ...
Acids - answer✔Proton donors - produce H+ ions in water
Alkalis - answer✔Proton acceptors - produce OH- ions in water
Acid + Base=
Metal oxide + Acid=
Metal hydroxide + Acid= - answer✔Salt + Water
Metal + Acid= - answer✔Metal salt + Hydrogen
Metal carbonate + Acid= - answer✔Metal salt + Carbon dioxide + Water
Ammonia + Acid= - answer✔Ammonium salt
Methyl orange - answer✔Yellow in alkali, red in acids
Phenolphthalein - answer✔Pink in alkali, colourless in acids
Oxidation number of oxygen - answer✔Nearly always -2, except in peroxides where it is -1 and
0 in molecular oxygen
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