Two beakers of magic water are placed on an electronic balance, as shown above. The combined mass is weighed and the reading on the balance shown to the class.

The display is hidden from the class and the water from one beaker is poured into the other. From nowhere a bright yellow solid powder is formed.

It is heavy and quickly settles to the bottom of the beaker, as shown on the right.

The teacher can start by asking the following questions
In which beaker was this solid hiding?
Why could we not see it?
Is it possible to make this solid visible by evaporating the water from the beaker?

What is the reading on the balance? Is it higher, lower or unchanged? Check it out

3) A student weighed two clear solutions on an electronic balance, as shown on the right, and recorded the combined mass of the two beakers as 154.51 grams. The contents of one beaker was then placed into the other beaker and a heavy, yellow,solid magically appeared.

This solid was filtered, dried and weighed. Its mass was 56.78 grams. What was the total mass of the two beakers after the contents were mixed together? Explain your answer.