Saturated, unsaturated and supersaturated solutions

Answer Key - Grade 10 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   Baking soda dissolves up to 11.1 g per 100 g of water at 30 °C. 30 g is stirred into 200 g of water at 30 °C. How many grams stay undissolved, Jun?

   7.8 g
2. 2.

   Sugar dissolves up to 200 g per 100 mL of water at 25 °C. 290 g is stirred into 130 mL of water at 25 °C. How many grams stay undissolved, Kira?

   30 g
3. 3.

   Kira says crystals at the bottom of a solution mean it is supersaturated. Which reply fits, Luz?

   • Agree: extra solid means extra solute is dissolved
   • Agree, as long as the solution is still warm
   • Disagree: leftover crystals sit in a saturated solution
4. 4.

   Noah says a saturated solution can dissolve no more at any temperature. Which reply fits, Milo?

   • Agree: saturated means full, whatever the temperature
   • Disagree: warming usually lets more of a solid dissolve
   • Agree: temperature has no effect on how much dissolves
5. 5.

   Pia says a supersaturated solution holds more solute than it normally can. Which reply fits, Noah?

   • Disagree: it holds less solute than a saturated one does
   • Disagree: no solution can ever hold more than its limit
   • Agree: it is above the limit, so it is unstable
6. 6.

   On a baking soda solubility chart, a point sits at 50 °C and 10.0 g per 100 g; the curve reads 14.5 g there. Which is it, Pia?

   • Unsaturated: the point is below the curve
   • Saturated: the point is close enough to the curve
   • Supersaturated: the point is above the curve
7. 7.

   A point sits at 30 °C and 11.1 g per 100 g; the curve reads 11.1 g there. Which is it, Ren?

   • Supersaturated: the point is above the curve
   • Saturated: the point is on the curve
   • Unsaturated: the point is just below the curve
8. 8.

   A point sits at 0 °C and 9.0 g per 100 g; the curve reads 6.9 g there. Which is it, Tala?

   • Supersaturated: the point is above the curve
   • Saturated: the point is on or near the curve
   • Unsaturated: the point is below the curve line
9. 9.

   A solution holds 12.7 g of baking soda per 100 g of water at 60 °C, where the limit is 16.5 g. How much more could dissolve, Ari?

   • 3.8 g per 100 g of water
   • 29.2 g, from 12.7 + 16.5
   • 12.7 g, the amount already in
10. 10.

    Two cups of 100 g of water at 25 °C get 30 g and 40 g of salt (limit 36.0 g). What is true, Bo?

    • The 40 g cup is supersaturated, with 4 g extra dissolved in it
    • Both are saturated, since both are close to 36 g
    • The 30 g cup is unsaturated; the 40 g cup has 4 g undissolved