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?

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

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

   • They are the same
   • Beaker A, as it has more dots
   • Beaker B, as it has less water
6. 6.

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

   • The sugar disappears
   • It goes down
   • It goes up: more liquid
   • It stays the same: same sugar
7. 7.

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

   • It stays the same: same water
   • It goes down
   • It turns into a new substance
   • It goes up
8. 8.

   Pia pours half of a glass of sugar water into a second glass. How does the concentration in each glass compare with before?

   • It is half as strong: half the sugar
   • It is twice as strong: less water
   • It is zero in the second glass
   • It is the same as before
9. 9.

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

   • Dissolved very slowly
   • Little dissolved in each 100 mL
   • Little liquid in the beaker
   • A small beaker
10. 10.

    A tiny cup and a huge jug hold lemonade of the same strength. What do they share, Zee?

    • The same number of lemons
    • The same sugar in each 100 mL
    • The same total sugar
    • The same amount of liquid