IGCSE Chemistry past paper 0620/43/o/n/21

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In this video we will solve and explain Cambridge IGCSE chemistry paper 43 October/November 2021.

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Intro: (00:00)
Question1: (00:10)
A list of substances is shown.
ammonia
bauxite
carbon dioxide
carbon monoxide
ethanol
hematite
oxygen
sodium chloride
sulfur dioxide
Answer the questions using the list of substances.
Each substance may be used once, more than once or not at all.
State which substance is:

Question2: (01:20)
This question is about electrolysis.
(a) State the meaning of the term electrolyte.

Question3: (03:42)
Lead is a metallic element in Group IV. One of the ores of lead is galena, which is an impure form
of lead(II) sulfide, PbS.
Lead also occurs in the ore cerussite, which contains lead(II) carbonate, PbCO3.
(a) Calculate the relative formula mass, Mr, of PbCO3.

Question4: (08:42)
Carbon is an important element.
(a) Carbon exists as the isotopes 126C and 136C.
Complete the table.

Question5: (11:11)
(a) Dilute sulfuric acid and aqueous sodium hydroxide can be used to prepare sodium sulfate
crystals using a method that involves titration

Question6: (14:09)
A student investigates the decomposition of hydrogen peroxide in the presence of a catalyst of
manganese(IV) oxide.
2H2O2(aq) → 2H2O(l) + O2(g)
(a) State the meaning of the term catalyst.

Question7: (16:51)
(a) Ethanol is a member of the homologous series of alcohols.
Give two characteristics of members of a homologous series.

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