IGCSE Chemistry pastpaper 0620/63/m/j/21

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In this video we will solve and explain Cambridge IGCSE chemistry paper 63
May/June 2021.

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Intro: (00:00)
Question1: (00:10)
1 Cobalt(II) sulfate is a soluble salt. It can be made by reacting insoluble cobalt(II) oxide with
dilute sulfuric acid.
A student made a sample of hydrated cobalt(II) sulfate using the following steps.
(a) Name the items of apparatus labelled A and B.

Question2: (02:19)
2 A student investigated the rate at which hydrogen gas was made when magnesium reacted with
dilute sulfuric acid.
Five experiments were carried out using the apparatus shown.
Experiment 1
● Using a measuring cylinder, 25cm3
of dilute sulfuric acid was poured into a conical flask.
● Using a different measuring cylinder, 30cm3
of distilled water was poured into the conical flask.
● The apparatus was set up as shown in the diagram.
● The bung was removed from the conical flask.
● A coiled length of magnesium ribbon was added to the conical flask, the bung was replaced
immediately and a timer started.
● The volume of gas collected in the inverted measuring cylinder after 30 seconds was measured.

Question3: (09:13)
3 Solid I and solid J were analysed. Solid I was chromium(III) chloride.
tests on solid I
Complete the expected observations.
Solid I was placed in a boiling tube and about 10cm3
of distilled water was added to the boiling tube. The mixture was shaken to dissolve solid I and form solution I. Solution I was divided into
four portions in four test-tubes.
(a) Aqueous sodium hydroxide was added dropwise and then in excess to the first portion of
solution I.

Question4: (13:15)
4 The energy given out when different liquid alcohols are burned can be compared using the apparatus shown.
Describe how the apparatus shown can be used to compare the amount of energy given out by
three different liquid alcohols, ethanol, propanol and butanol. Your answer should include how the
results can be used to determine which fuel gives out the most energy.

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Hello! This video was soo useful. Thank you so much 🙏🙏 I had a question: Are the answers to the questions answers that could possibly get you full marks?