Saturated, unsaturated and supersaturated solutions
Grade 10 Science Worksheet
Circle the best answer, or write your answer on the line.
Salt dissolves up to 36 g per 100 g of water at 25 °C. What is the most that dissolves in 250 g of water at 25 °C, Bo?
Sugar dissolves up to 200 g per 100 mL of water at 25 °C. What is the most that dissolves in 75 mL of water at 25 °C, Jun?
Baking soda's limit is 12.7 g per 100 g of water at 40 °C. A solution at 40 °C holds 10.0 g per 100 g. Which is it, Kira?
- Saturated
- Supersaturated
- Unsaturated
Baking soda's limit is 9.6 g per 100 g of water at 20 °C. A solution at 20 °C holds 9.6 g per 100 g. Which is it, Luz?
- Saturated
- Unsaturated
- Supersaturated
Baking soda's limit is 8.2 g per 100 g at 10 °C. A slowly cooled, clear solution at 10 °C holds 11.0 g per 100 g. Which is it, Milo?
- Supersaturated
- Saturated
- Unsaturated
A saturated baking soda solution at 60 °C (16.5 g per 100 g) cools to 20 °C (9.6 g). What usually happens, Noah?
- Nothing, since the solid stays dissolved as it cools
- About 6.9 g per 100 g of water crystallizes out
- More baking soda dissolves as the water cools
Why do crystals often form when a hot saturated solution cools, Pia?
- Cold water dissolves more, which pushes the old crystals out of it
- The water itself freezes into crystals
- Most solids dissolve less when cold, so the extra comes out
A saturated salt solution warms from 25 °C to 60 °C. What happens to how much salt it can hold, Ren?
- It can hold less, so salt crystallizes out of it as it warms up
- It can hold a little more, so it becomes slightly unsaturated
- It turns supersaturated as it warms
How is a supersaturated solution usually reached, Tala?
- By leaving undissolved crystals sitting on the bottom
- By stirring extra solid into a cup of cold water
- By cooling a hot saturated solution gently, with no crystals
After crystals form in a supersaturated solution, what is the liquid left behind, Ari?
- Saturated: it holds the most that can dissolve
- Still supersaturated, with the same extra solute dissolved
- Pure water, with no solute left in it