IGCSE CHEMISTRY SOLVED past paper 0620/62/F/M/23 - February / March 2023 Paper 62

Рет қаралды 5,854

Күн бұрын

Cambridge IGCSE Chemistry paper 62 February / March 2023 - (0620_m23_qp_62), Solved and Explained.
To further explain the logic behind drawing a smooth curve instead of a straight line of best fit in Question 2, it is essential to consider the nature of the relationship between the variables under analysis. Thus the decision to choose between a straight or curved line of best fit in a chemistry IGCSE exam hinges on the following factors:
1. Linear Relationship: If the data points exhibit a clear and consistent linear relationship, wherein an increase in one variable corresponds to a proportional increase in the other variable, a straight line of best fit is appropriate.
2. Curved Relationship: Conversely, if the data points demonstrate a curved relationship, wherein the "Rate" of increase or decrease in one variable "Varies" with changes in the other variable, a curve of best fit is more suitable.
It is crucial to emphasize that the choice between a straight or curve line of best fit should be solely based on the characteristics of the data and the relationship between the variables, rather than personal preferences or assumptions.
More videos explaining and solving chemistry past papers (0620/0971) are going to be uploaded so make sure you subscribe to the channel to stay updated!
For personalized guidance and support, we offer online tuition services. If you would like to register for online tuitions, please contact us on WhatsApp at +971 52 328 7956 or +20 101 608 4662.
Intro: (00:00)
Question1: (00:10)
Long-chain alkanes can be broken down into shorter chain alkanes and gaseous alkenes. Vapour from a long-chain alkane is passed over a very hot catalyst and the gases formed are collected over water. The apparatus used is shown in Fig. 1.1.
Question2: (03:21)
A student investigates the solubility of ammonium chloride in water at different temperatures. The student does five experiments using the following instructions. Experiment 1 ● Fill a burette with distilled water. ● Run some of the water out of the burette so that the level of the water is on the burette scale. ● Use the burette to add 8.0cm3 of distilled water to a 5.25g sample of ammonium chloride in a boiling tube. ● Clamp the boiling tube at an angle, as shown in Fig. 2.1.
Question3: (12:08)
A student tests two solutions: solution C and solution D. Tests on solution C Solution C is aqueous calcium nitrate. Complete the expected observations. The student divides solution C into three portions.
(a) The student carries out a flame test on the first portion of solution C. observations
Question4: (16:48)
Cadmium, cobalt and vanadium are all metals. They react with dilute hydrochloric acid to form hydrogen gas. These reactions are exothermic. Plan an investigation to find the order of reactivity of the three metals. Your plan must make it clear how your investigation will be a fair test and how you will use your results to place the metals in order of reactivity. You are provided with powdered samples of each metal, dilute hydrochloric acid and common laboratory apparatus.

Пікірлер: 20

@DrMonaSeif 2 ай бұрын

To further explain the logic behind drawing a smooth curve instead of a straight line of best fit in Question 2, it is essential to consider the nature of the relationship between the variables under analysis. Thus the decision to choose between a straight or curved line of best fit in a chemistry IGCSE exam hinges on the following factors: 1. Linear Relationship: If the data points exhibit a clear and consistent linear relationship, wherein an increase in one variable corresponds to a proportional increase in the other variable, a straight line of best fit is appropriate. 2. Curved Relationship: Conversely, if the data points demonstrate a curved relationship, wherein the "Rate" of increase or decrease in one variable "Varies" with changes in the other variable, a curve of best fit is more suitable. It is crucial to emphasize that the choice between a straight or curve line of best fit should be solely based on the characteristics of the data and the relationship between the variables, rather than personal preferences or assumptions.

@stopitgetsomehelp3314 8 ай бұрын

Thanks doc

@zzzdead 11 ай бұрын

thank you so much for the effort

@Bwa909 2 ай бұрын

Today i did my p6 chem and i wanted to thank you bc i would have never done it on my own / even tho i was taking priv tutors i loved and understood you sm

@user-mq2kr6eq2j 8 ай бұрын

omg thank you so much u helped me so much with chem p6 god bless u have a good day

@hamzasalmann 8 ай бұрын

Thanks alot for this maam, you helped alot!

@syedahsarahshah4777 2 ай бұрын

Aoa, can you tell how does the temperature determine reactivity rate, and do you heat the HCl or something to get temperature change? I don't quite understand

@DrMonaSeif 2 ай бұрын

The reaction is exothermic so the higher the reactivity of the metal the reaction will be more exothermic and produce higher increase in temperature so we can use the increase in temperature to determine reactivity

@imannoying9749 6 ай бұрын

good evening doctor, can u explain why in question 2 u added 0.5 to the water volume even though it doesnt mention it anywhere in the question?

@DrMonaSeif 6 ай бұрын

It is mentioned in the beginning of experiment 2 that we will add 0.5 cm³ to the mixture ( from exp 1) then we will repeat that in experiment 3 adding another 0.5 cm³ and in experiment 4 add another 0.5 and also in experiment 5

@imannoying9749 6 ай бұрын

@@DrMonaSeif okay thank you jazakallah khair

@itzdxmonez_4495 5 ай бұрын

Can i do rate of h2 produced to see reactivity

@DrMonaSeif 5 ай бұрын

Measure time until set volume of gas collected OR measure volume of gas after a set time

@itzdxmonez_4495 5 ай бұрын

Thank you!!!

@rayyankhan9313 5 ай бұрын

In question number 2 b) it says draw a line of best fit but you drew a smooth line graph, so is it a mistake or are u supposed to make a smooth line graph.

@danganphuong2605 3 ай бұрын

The mark scheme actually tells to draw a curve 😢

@cloudyoonie2657 2 ай бұрын

@@danganphuong2605 how can we know what they actually want? other papers ask for line of best fit and the answer IS a line of best fit. if you could please explain, thank you :D

@ninjaarms4865 2 ай бұрын

@@cloudyoonie2657 she explained it in the video, you gotta look at the data given