This week, the 4th and 5th graders are working on putting together mixtures and then separating them using filters, screens and evaporation. Last week we mixed gravel and water, powder and water, and salt and water. The screen and filter were able to separate the gravel mixture and the powder mixture, but the salt dissolved in the water and passed through both. We will use evaporation to get rid of the water, leaving behind salt crystals. On Thursday, we'll investigate how to determine the mass of salt in water without measuring the salt directly on a balance.
Key questions to ask your student:
- What is a mixture and what are some examples? (Any two or more substances put together. Examples are infinite! )
- What is a solution? (A special type of mixture where the solid dissolves, like salt in water.)
- What tools can we use to separate mixtures and solutions? (Screen, filters, evaporation)
- How did you find the mass of the salt on Thursday?
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