Recent science work in Year 5 has involved the pupils experimenting with different methods to try and separate various mixtures. This work started off by looking at some of the techniques that we can use to separate out mixtures. The pupils have been coming up with working definitions for filtration, evaporation, distillation and sieving.
A recent science session in Year 5 centred around the use of a sieve to help separate some of the dirt in a large bowl of river water. The aim of our experiment was to see if we could sieve out some of the larger particles, and end up with a cleaner cup of water. A challenge was set to see which science group could produce the cleanest final outcome.
The pupils planned the experiment by thinking about some of the material that could be used to sieve out the dirt from the water. We have been learning the theory behind this process, which involves large particles not being able to pass through the incredibly small holes in a sieve.
Cotton wool and a tea serviette were used as the main material to sieve out the dirt. We made sure that this was a fair test by using the same bowl of dirty river water for all of the young scientists to work with. Each group made a prediction about which material would serve best as a sieve.
The practical work involved gently pouring the dirty water from one cup to another, with either the cotton wool or the serviette placed over the top. The overall results were compared at the end of the session. We were able to conclude that cotton wool is an excellent material to use as a sieve.