Physics, 12.10.2020 21:01 zoe2252

QUESTION 4 Chloroflourocarbons(CFC's) are a class of compounds that have a long history of use in
refrigerators CFC's are slowly being phased out as they deplete the amount of ozone (og
in the ozone layer. Jabu has a sample of CFC that has the following percentage
composition: 14.05% carbon, 41.48%chlorine and 44.46% fluorine.
4.1 Define the term empirical formula.
(1)
4.2 Determine the empirical formula of this CFC.
(8)
4.3 Determine the molecular formula of this CFC if the molar mass is 171g. mor
[11]
QUESTION 5
5.1 Study the following substances and answer questions based on them
H2SO Ca(OH)2
NH OH NaCl CH3COOH
5.1.1 Define a strong acid
(1)
5.1.2 Which substance above is a strong base?
5.1.3Which substance above is a weak acid?
5.1.4 Write down a balanced equation when oxalic acid reacts with Sodium Hydroxide
5.1.5 Which substance above is a salt product of neutralisation process?
5.1.6 Which substance above is a diprotic acid? Explain your answer
(2)

Answers: 3

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QUESTION 4 Chloroflourocarbons(CFC's) are a class of compounds that have a long history of use in

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