IGCSE CHEMISTRY SOLVED past paper 0620/42/F/M/22 - Feb/March 2022 Paper 42

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This video solves and explains Cambridge IGCSE Chemistry paper 42 February / March 2022.

Hope that everyone finds it useful and helpful before their examination !!

If you have any questions please leave them in the comments below and I will answer them all.

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Intro: (00:00)
Question1: (00:09)
This question is about the first 30 elements in the Periodic Table.
Name the element which:

Question2: (03:30)
A student adds excess large pieces of magnesium carbonate, MgCO3, to dilute hydrochloric acid,
HCl, and measures the volume of carbon dioxide gas, CO2, given off.

Question3: (09:53)
Nitrogen dioxide, NO2, is an atmospheric pollutant and is formed in car engines.
(a) Explain how nitrogen dioxide is formed in car engines.

Question4: (16:06)
This question is about chemical reactions and electricity.
(a) The diagram shows the apparatus used in the production of electrical energy in a simple cell.

Question5: (20:11)
This question is about alkanes and alkenes.
(a) Short-chain alkanes and alkenes can be formed from long-chain alkanes in a chemical reaction.
(i) Name the type of chemical reaction which forms short‑chain alkanes and alkenes from
long‑chain alkanes.

Question6: (26:30)
The names of four esters are listed.
methyl propanoate
ethyl propanoate
propyl propanoate
butyl propanoate
(a) Esters are a family of organic compounds with similar chemical properties. They can be
represented by the formula CnH2nO2.

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[maylight]

Hi Dr Mona, your video really helped me when solving past papers. Just a question, in qs 3 (c) (ii) how did you know the order of the product, like how do you know it is HNCO, and not CONH or NHCO.. Is there a specific criteria I have to follow to know the exact order?

[mohannadmohamadhasseb]

Thank you soo much it really helps me
❤❤

[forgottenkitten]

Thank you sooo much for your efforts, the explanation is quite clear and fairly detailed.

[raidm]

for Q6dii) the answer is just ethyl butanoate and butyl ethanoate in the mark scheme, is it ok if i write smth else like methyl pentanoate

[jomanaeldod]

I dont quite understand why did we choose a metal below iron in q4 bii