Particles - dilutions worksheet (x2)

I wrote this worksheet for a KS3 Chemistry lesson on particles. It is a standard dilutions practical. I wanted to see if my students could follow written instructions without any demonstration. We had done several lessons on particles, so they had enough science in order to be able to explain what was happening.
You need a concentrated solution of potassium permanganate for this experiment rather than crystals. Explain what you are doing with it and your lab. tech. should be able to supply an appropriate quantity and concentration. The final dilution should be barely observable. Remember that each group only needs 1ml so the total amount for a class will only be in one small beaker.
You need to do your own risk assessment but remember eye protection must be worn.
Tip: you will find it easier to control if students use 1ml pipettes instead of the standard 3ml.
Another tip: keep the concentrated solution with you at the front with one pipette. If each group sends a student to you with an empty test tube you can ensure that it is measured accurately. They then take theirs back to their bench and add 9ml water to it for their first dilution.