Chemistry IGCSE Past Paper 0620/61/m/j/21

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In this video we will solve and explain Cambridge IGCSE chemistry paper 61
May/June 2021.

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Intro: (00:00)
Question1: (00:09)
1 Many indicators are coloured substances obtained from plants.
A student extracted the coloured substances from some berries using the method shown.
(a) Name the items of apparatus labelled A, B and C.

Question2: (02:29)
2 A student investigated the temperature decrease when sodium hydrogencarbonate reacts with
dilute hydrochloric acid.
The student did six experiments.
Experiment 1
● Using a measuring cylinder, 25cm3
of dilute hydrochloric acid was poured into a conical flask.
● The initial temperature of the acid was measured using a thermometer.
● 1g of sodium hydrogencarbonate was added to the conical flask. At the same time a stop‑clock
was started.
● The acid and sodium hydrogencarbonate mixture in the conical flask was stirred continuously
using the thermometer.
● The temperature of the mixture after 1 minute was measured.
● The conical flask was rinsed with distilled water.

Question3: (09:26)
3 Solid E and solution F were analysed.
Tests were done on each substance.
tests on solid E.
(a) State the conclusion that can be made from the observations in test 1.

Question4: (13:35)
4 Dilute hydrochloric acid reacts with calcium carbonate to make carbon dioxide gas. The apparatus
shown in the diagram can be used to follow the progress of the reaction. The carbon dioxide gas
leaves the flask causing the mass shown on the balance to decrease.
Plan an investigation, using the apparatus shown in the diagram, to find out how the temperature
of the dilute hydrochloric acid affects the rate of the reaction. Your plan should include how your
results will show how the temperature of the dilute hydrochloric acid affects the rate of the reaction.
You are provided with dilute hydrochloric acid, calcium carbonate and common laboratory apparatus.

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