James Ruse qn & plotting line graphs (1 Viewer)

[porcupinetree]

The following question was in the JRAHS 2011 Trial:

Because the HCl acts as a limiting reagent when the mass of zinc > ~1.1g, I figured it would be best to draw a straight line of best fit that went through the origin.
However, the answers have a curved line of best fit which did not go through the origin.
Perhaps it was to do with the wording of the question: 'line graph', rather than 'line of best fit'?

Anyone care to shed some light on how to approach questions like this?

Thanks

 

[dan964]

a straight line is inappropriate as it is quite clear that the line is actually a curve.

 

[Fizzy_Cyst]

Lines of best fit do not have to be straight FYI.

Directly from the syllabus:

identifying situations where use of a curve of best fit is appropriate to present graphical
information

You need to interpret the graph and determine the best line of fit for it