In the beginning of Chapter 1, Rate of Reaction in Form 5 Chemistry, a students needs to draw a graph to show the changes of quantity of reactants/products over a period time.
A perfect graph must have few criteria as follows:
- Label the two axes with the correct unit
- Choose a suitable scale. The size of the graph should be at least ¾ of the size of the graph paper.
- Plot all the points correctly
- Smooth graph (curve or straight line )
Most of the time, I found my students a bit hard to draw a perfect graph especially when drawing a smooth graph. Perhaps they need a sharp pencil and more practice. The skill again will be assessed in PEKA through the coming experiments to investigate the effect of temperate and concentration of reactants on the rate of reaction. All the best and good luck!!