Chemistry Assessment Rubric

YEAR 9 CHEMISTRY
Assessment Task: Rates of Reaction -     Experiment


Class experiments: May 2014
Report Due: TBA

You will be assessment on the following criteria:

Criteria D: Scientific Enquiry
Criteria E: Processing Data
Criteria F: Attitudes in Science


YOUR TASK: Students will investigate the effect of one of the following factors on the rate of chemical reactions:

a) Concentration
b) Surface area
c) Temperature

Students are free to choose which factor they will be investigating. They will then carry out the experiments below related to their chosen factor.

For example:
• If you are going to investigate the effects of concentration on the rate of reactions, you will carry out experiment 1.
• If you are going to investigate the effect of surface area on the rate of reactions, you will carry out experiment 2.
• If you are going to investigate the effect of temperature on the rate of reactions, you will carry out experiment 3.














Experiment:   Magnesium plus hydrochloric acid gives you magnesium chloride and hydrogen gas

  Mg (s)   +   2 HCl (aq)     ---------     MgCl2   (aq)   +     H2 (g)

1) The concentration of hydrochloric acid (2M concentration and 0.5M concentration) can change the rate of reaction (use magnesium strips).

2) The surface area of magnesium (strips and powder) can change the rate of reaction (use 2M concentration hydrochloric acid).

3) The temperature of hydrochloric acid (0 and 25 degrees) can change the rate of reaction (use 2M concentration hydrochloric acid and magnesium strips).

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Equipment you may need: (NOTE: The equipment you will need will depend on which factor you are testing).

-   Hydrochloric acid of one or more concentration (0.5M, 2M)
-   Magnesium in powder and/or strip form (0.1 g per experiment)
-   Sand paper (for magnesium strips)
-   Test Tubes and Test...