How concentrated is it? Comparing solutions

Answer Key - Grade 8 Science Worksheet - Building Confidence

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

1. 1.

   Ari's beaker drawing shows 12 sugar dots in 300 mL of water. How many dots are in each 100 mL?

   4 dots
2. 2.

   A beaker holds 10 dots of dissolved salt in 200 mL. Split it into 100 mL parts. How many dots are in each part, Bo?

   5 dots
3. 3.

   Esme draws 18 dots of dissolved sugar in a 600 mL jug. How many dots are in each 100 mL?

   3 dots
4. 4.

   Two beakers each hold 100 mL. Which solution is more concentrated, Jun?

   • Neither: they have the same volume
   • Beaker B
   • Beaker A
5. 5.

   Both beakers hold 6 dots. Which solution is more concentrated, Kira?

   • Beaker A
   • Beaker B, as it holds more liquid
   • Neither: they have the same dots
6. 6.

   Beaker A has 10 dots in 200 mL. Beaker B has 5 dots in 100 mL. Which is more concentrated, Luz?

   • Beaker B, as it has less water
   • They are the same
   • Beaker A, as it has more dots
7. 7.

   Milo adds more water to a glass of sugar water and stirs. What happens to its concentration?

   • It stays the same: same sugar
   • It goes up: more liquid
   • It goes down
   • The sugar disappears
8. 8.

   Noah stirs more sugar into the same glass of water until it dissolves. What happens to its concentration?

   • It turns into a new substance
   • It goes up
   • It goes down
   • It stays the same: same water
9. 9.

   Ren's glossary has a blank by concentration. Which meaning belongs there?

   • How fast something dissolves
   • How much liquid there is
   • How much is dissolved, whatever the amount of liquid
   • How much is dissolved in a set amount of liquid
10. 10.

    Next, Tala fills in the word dilute. Which meaning belongs there?

    • Little dissolved in each 100 mL
    • Little liquid in the beaker
    • Dissolved very slowly
    • A small beaker