How concentrated is it? Comparing solutions

Answer Key - Grade 8 Science Worksheet

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

1. 1.

   Ari's lemonade has 30 g of sugar dissolved in 500 mL. How many grams of sugar are in each 100 mL?

   6 g
2. 2.

   A big jug of lemonade has 45 g of sugar in 900 mL. How many grams of sugar are in each 100 mL, Bo?

   5 g
3. 3.

   Beaker drawing (example data). Jun ranks three beakers from most to least concentrated. Which order is right?

   • Q, P, R, as Q has the most liquid
   • P, Q, R
   • P, Q and R tied, as P and Q match
   • R, Q, P
4. 4.

   Kira ranks three more beakers. Which is the most concentrated?

   • Beaker X, as it has the most liquid
   • Beaker Y
   • Beaker Z
   • Beaker X, as it has the most dots
5. 5.

   Which two beakers have the same concentration, Luz?

   • K and L
   • No two beakers
   • J and L, as they have the same dots
   • J and K
6. 6.

   Noah's cocoa tastes too strong. Which change makes it less concentrated?

   • Let it sit
   • Stir in more milk
   • Pour half into another mug
   • Stir in more cocoa powder
7. 7.

   Pia's lemonade is too sour. Which change would make it less concentrated in lemon juice?

   • Pour half into a smaller glass
   • Add more lemon juice
   • Leave out the ice
   • Add more water
8. 8.

   “example data” Beaker A has 8 dots in 200 mL. Ren adds 200 mL of water. Which drawing shows the beaker after?

   • 8 dots packed into 200 mL
   • 16 dots in 400 mL
   • 4 dots in 400 mL
   • 8 dots spread through 400 mL
9. 9.

   Beaker B has 6 dots in 300 mL. Tala stirs in 6 more dots of sugar. Which drawing shows after?

   • 6 dots in 600 mL
   • 6 dots in 300 mL, unchanged
   • 12 dots in 150 mL
   • 12 dots in 300 mL
10. 10.

    Beaker C has 10 dots in 200 mL. Some water evaporates, leaving 100 mL. How has the concentration changed, Zee?

    • It doubled
    • It stayed the same: same dots
    • It halved: less liquid
    • It dropped to zero