Grade 8 · Science

8th grade How concentrated is it? Comparing solutions worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

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How concentrated is it? Comparing solutions

Grade 8 Science Worksheet - Building Confidence

NameDate

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

Ari's beaker drawing shows 12 sugar dots in 300 mL of water. How many dots are in each 100 mL?
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?
Esme draws 18 dots of dissolved sugar in a 600 mL jug. How many dots are in each 100 mL?
4.
Two beakers each hold 100 mL. Which solution is more concentrated, Jun?
- Neither: they have the same volume
- Beaker B
- Beaker A
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.
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.
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.
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.
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.
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

8th grade How concentrated is it? Comparing solutions worksheet – printable — Print: 1 2 3 4 5 6

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

See all grade 8 science

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