Sugar dissolves in water and cannot be seen. Has it gone? The balance knows the answer.
I put sugar in water and stirred
A board to adjust
Where has the sugar gone? Drag the bag in and stir, and watch the reading on the balance.
If you keep adding salt, will it all dissolve?
A board to adjust
Add one spoonful at a time. Change the temperature of the water too, and try it with sugar or boric acid.
Which cup of sugar water is stronger?
A board to adjust
Put different amounts of sugar in two cups and float a quail's egg in each.
From here the amount that dissolves becomes a graph
What comes next in middle school · the characteristics of substances
A different line for each substance
It is the salt you dissolved above. Mark how much dissolves at each temperature, join the points, and you have a line. Each substance has a different line, so the line is the substance's name tag.
The salt from above
A board to adjust
This time, how much dissolves at each temperature, as a graph. The lines for sugar and boric acid are there too.
