Does it Dissolve?

Sometimes when you mix things with water they seem to disappear.  But where have they gone?

For example - when you mix salt with water you can't see the salt anymore.  We say that the salt has dissolved.

When the water and the salt are mixed together the salt crystals get smaller and smaller.  They dissolve in the water to make a solution.  We can't see the salt but it is still there.

The Year 3 and 4 students did an investigation to find out which substances would dissolve in water.

The tea leaves did not dissolve.  They just floated around in the water.

The drink powder did dissolve.  We couldn't see the little crystals anymore.  They water changed to a green colour.

The sugar mostly dissolved.  Some of the crystals took a long time to dissolve.