IGCSE CHEMISTRY SOLVED past paper 0620/61/O/N/22 - October / November 2022 Paper 61

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This video solves and explains Cambridge IGCSE Chemistry paper 61 October / November 2022.

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Intro: (00:00)
Question1: (00:10)
Sulfur dioxide gas is toxic, denser than air and soluble in water. Sulfur dioxide gas can be made by adding dilute hydrochloric acid to solid sodium sulfite and heating the mixture. The gas made can be dried by passing it through concentrated sulfuric acid. The diagram shows the apparatus a student used to try and collect some dry sulfur dioxide gas. There are two errors in the way the apparatus has been set up.

Question2: (03:37)
A student investigated how the solubility of sodium sulfate in water changes with temperature. Eight experiments were done. Experiment 1 ● The mass of an empty evaporating basin was found. ● An excess of solid sodium sulfate was placed in a beaker. ● 100cm3 of cold water was added to the beaker. ● The mixture in the beaker was stirred and heated until it had reached a temperature of 15°C. Some of the sodium sulfate had dissolved to form a saturated solution. ● A 25.0cm3 portion of the saturated solution was removed from the beaker and transferred to the evaporating basin. ● The evaporating basin was heated until no more steam could be seen and solid sodium sulfate remained in the evaporating basin. ● The mass of the evaporating basin and the solid sodium sulfate remaining was found.
Experiment 2 ● Experiment 1 was repeated but the mixture in the beaker was heated to a higher temperature than in Experiment 1.

Question3: (13:03)
Two substances, solid W and solid X, were analysed. Solid W was zinc bromide. tests on solid W Complete the expected observations. Solid W was dissolved in water to form solution W. Solution W was divided into three equal portions.
(a) To the first portion of solution W, aqueous ammonia was added dropwise and then in excess. observations

Question4: (17:34)
The leaves of some trees contain coloured substances which can be used as pH indicators. These coloured substances are soluble in ethanol but insoluble in water. You should assume that nothing else in the leaves is soluble in ethanol. Plan an investigation to extract the coloured substances from some leaves and test them to see if they work as a pH indicator. You are provided with leaves from a tree and common laboratory apparatus and chemicals.

[maven]

wait hold on, for the graph shoudnt it be a curve?

[KX-yxgj]

Hi, I am a bit confused on Question 2d. I don't understand why is there no change.

Also, for question 3e, how would I know whether the anion is sulfate or sulfite as it shows both a positive test for sulfate and sulfite.

Could you please help me out? Thank you!

[Why_did_YouTube_add_handles]

why was there no change in question 2 (h), is it because 50 degrees celsius has higher solubility?

[xdSloshy]

When do u start the graph at origin and when do u don’t do

[brianyong]

The last may/june paper is given a list of precipitate to refer, does oct/nov paper still the same?

[maven]

i always get confused when they ask for a curve and when they dont