Name: ___________________________

Grinding chalk

Powdered chalk is added to pigments to make powder paints.

Try different methods of grinding to find out which one is the most effective.

Here are some suggestions, though you may have your own ideas.
Tick the ideas you would like to try:

1	Grinding the chalk with a pestle and mortar.
2	Putting the chalk in a plastic food bag and hitting and rollingit with a rolling pin.
3	Using a grater. (USE WITH CARE)
4	Shaking a plastic jar which has marbles or stones mixed in with the chalk.
5	Our own idea is to ___________________________________________ _________________________________________________________

In the box below, write about:

• a fair test
• measurements of any fixed amounts
• measurement of any changing amounts.

Record your results below:

We recommend the following grinding method:

__________________________________________________________________

because ____________________________________________________________