Plotting graph: manipulated variable, X-axes, responding, Y-axes?

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[Tay Guan Piang]

To all Chemistry teachers,

Just want to seek clarification in Chemistry, when we plot graph, is it correct that manipulated variable must be plotted on X-axes, and responding variable on Y-axes?

All sharing are very much appreciated. thanks a lot.

[Eric Chong]

should be like this. here is a attachment related to graph

[Tay Guan Piang]

should be like this. here is a attachment related to graph

Thanks a lot, Mr. Eric. Your sharing is very much appreciated.

[Jong Kah Yin]

Hi,
Just trying to share my opinion here. Maybe I belong to the older generation whereby we are taught in school as such when we are asked to plot a graph of temperature against time taken, it is understood that the y-axis is temperature whereas the x-axis is the time taken.

[Tay Guan Piang]

Hi,
Just trying to share my opinion here. Maybe I belong to the older generation whereby we are taught in school as such when we are asked to plot a graph of temperature against time taken, it is understood that the y-axis is temperature whereas the x-axis is the time taken.

So, Mr. Jong, is it means that when plotting graph, it doesn't mean that manipulated variable must be on x-axes and responding variable on y-axes? Any latest info, as my students really confuse on this matter? Really need a very confirm clarification from Mr. Jong. Thanks for your help, Mr Jong. Your sharing is very much appreciated.

[Eric Chong]

manipulate variable also called  independant variable. Time is independant in nature. Nothing can affect time. However, I think better we look at the purpose we plotting a graph. Line chart to show a changes or frustration. Bar chart to show distinction or differences. If put the manipulated variable at y axis, then probably hard for people to interpretate the information, example changes from time t1 to t3, or changes from temperature a to temperature b, whether increase or decrease. If manipulated put at x axis, then all the interpretation can be easily read.

One more thing, time not necessary must be at x axis. For example, temperature affect the time taken for the solute to be dissolved completely in solvent. TEMPERATURE place at x axis and the time taken place at y axis.
Time put at x axis for time series chart. For exmaple, graph show a tidal change within a period, population growth within certain period and etc.

This is just my oppinion. If any mistakes, please correct me for not let me keep the wrong concept.

[Tay Guan Piang]

manipulate variable also called  independent variable. Time is independent in nature. Nothing can affect time. However, I think better we look at the purpose we plotting a graph. Line chart to show a changes or frustration. Bar chart to show distinction or differences. If put the manipulated variable at y axis, then probably hard for people to interpret the information, example changes from time t1 to t3, or changes from temperature a to temperature b, whether increase or decrease. If manipulated put at x axis, then all the interpretation can be easily read.

One more thing, time not necessary must be at x axis. For example, temperature affect the time taken for the solute to be dissolved completely in solvent. TEMPERATURE place at x axis and the time taken place at y axis.
Time put at x axis for time series chart. For example, graph show a tidal change within a period, population growth within certain period and etc.

This is just my opinion. If any mistakes, please correct me for not let me keep the wrong concept.

well, i myself also having the same thinking, Mr. Eric. If what we say here is correct, then there are a very great mistake in F5 Chemistry text book, especially in the Chapter Rate of Reaction. When the factor of concentration of solution is studied with regards to rate of reaction, the graph sketched in the text book as if time is on x-axes, whereas concentration of solution is on y-axes.

So, Mr. Eric, if as what you say, then the text book really leads to a great misconception among the students as the graph should be plotted where concentration of solution should be on x-axes and time is on y-axes.

As a whole, which standard should we follow? text book or the ideas that we discussed here? How about in SPM?

[Eric Chong]

for the time vs concentration graph, actually this graph does not show the relationship between the concentration of solution and the rate of reaction. This graph is for the purpose of studying the rate of reaction, tat is to calculate the slope , k or rate coefficient. If k is negative value, it means decrease, positive means increase.

http://www.wwnorton.com/college/Chemistry/gilbert/concepts/chapter14/ch14_3.htm
please check to see.

Hope we find the truth for the sake of our students.

[Jong Kah Yin]

As to my knowledge, we do not emphasis so much about determining which variables becomes the x-axis and y-axis - this will make our students confused. Normally in practicals and exams, especially Paper 3, students are given instruction on the plotting of graph. For example, plotting a graph of temperature of naphthalene against time taken - it means the y-axis is temperature and x-axis is time. It is always a graph of y axis against x-axis.
In whatever graph plotted, we can still see the relationship between the variables plotted.

[Tay Guan Piang]

Thanks a lot, Mr. Eric and Mr. Jong. So, what is the conclusion in this matter? Should we follow exactly what textbook said? or follow what Mr. Eric had told earlier?

[Eric Chong]

In this case, i think better dnt burden the student to study the actual of graph, but emphasize on master the skill of graph plotting. AS Mr. JONG told, the question give the instruction on how to plot the graph, so, ploting graph should be no problem. The higher knowledge let the student to explore when they do their tertiary education. Learning require step by step procedure, that is start with basic concept and advance to higher level. Student can't afford to absord n digest so many knowledge for they are just Form 4 and Form 5 kids. Form 6 will further expose them to the advanced chemistry knowledge. So, what they ought to do do now are master the basic concepts, master the solution skills, master the techniques of tackle the SPM oriented question. If they pass and succeed to Form 6, then they meet the new chemistry world.

Just my opinion.

[Tay Guan Piang]

In this case, i think better dnt burden the student to study the actual of graph, but emphasize on master the skill of graph plotting. AS Mr. JONG told, the question give the instruction on how to plot the graph, so, ploting graph should be no problem. The higher knowledge let the student to explore when they do their tertiary education. Learning require step by step procedure, that is start with basic concept and advance to higher level. Student can't afford to absord n digest so many knowledge for they are just Form 4 and Form 5 kids. Form 6 will further expose them to the advanced chemistry knowledge. So, what they ought to do do now are master the basic concepts, master the solution skills, master the techniques of tackle the SPM oriented question. If they pass and succeed to Form 6, then they meet the new chemistry world.

Just my opinion.

Ok, thanks a lot, Mr. Eric for your clarification. Your help is very much appreciated.

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