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8th grade How concentrated is it? Comparing solutions worksheet

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How concentrated is it? Comparing solutions

Grade 8 Science Worksheet

NameDate

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

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

  2. Esme mixes a pitcher with 28 g of sugar in 400 mL. How many grams of sugar are in each 100 mL?

  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 and R tied, as P and Q match
    • R, Q, P
    • P, Q, R

  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. Which two beakers have the same concentration, Luz?

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

  6. Milo makes juice from a frozen orange concentrate by stirring in three cans of water. How does the juice compare with the concentrate?

    • The juice is just as strong: same flavor
    • The juice is more dilute
    • The juice is stronger: more liquid
    • The juice has no flavor

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

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

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

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

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

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

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

    • It stayed the same: same dots
    • It dropped to zero
    • It halved: less liquid
    • It doubled
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8th grade How concentrated is it? Comparing solutions worksheet – printable
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About this worksheet

How concentrated is it? Comparing solutions. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can compare solutions by the amount dissolved in each 100 mL, not by the total or by the volume alone.
  • I can say what adding water, adding solute, pouring off half or evaporating water does to concentration.
  • I can work out how much water to add for a target strength, and what strength a mix of two solutions has.

Standard: none (IXL parity)

Words to know

solution: A mixture where one substance is dissolved evenly in another

solute: The substance that dissolves, like sugar

solvent: The liquid it dissolves in, like water

concentration: How much solute is dissolved in a set amount of solution

dilute: Having little solute in each 100 mL

concentrated: Having a lot of solute in each 100 mL

Common mistakes

Your child gave the total number of dots instead of the dots in each 100 mL. Split the liquid into 100 mL parts and share the dots out.

Your child multiplied the amount by the volume. To find how much is in each 100 mL, divide the amount by the number of 100 mL parts.

Your child compared only how much was dissolved, not how much liquid it was in. Concentration is the amount for each 100 mL.

Questions parents ask

What is the most common mistake with how concentrated is it? comparing solutions?

Your child gave the total number of dots instead of the dots in each 100 mL. Split the liquid into 100 mL parts and share the dots out.

Are these 8th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

More grade 8 science

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