Concentration of solutions | Combined science | Quizalize & Oak National Academy

Starter quiz

Match the units to the correct measurement.

mass

⇔

kg ✓

volume

⇔

cm³ ✓

temperature

⇔

℃ ✓

weight

⇔

N ✓

concentration

⇔

g/dm³ ✓
What is the state symbol for water at room temperature?

s

l ✓

g

aq
Match the definition with the correct keyword.

solution

⇔

substance formed when a solute dissolves into a solvent ✓

solute

⇔

a substance that has dissolved into a solvent ✓

solvent

⇔

a substance into which a solute dissolves ✓
Which solution will have the highest concentration?

Solution 1 contains 10 g of solute dissolved in 100 cm³ of water. ✓

Solution 2 contains 8 g of solute dissolved in 100 cm³ of water.

Solution 3 contains 5 g of solute dissolved in 100 cm³ of water.

Solution 4 contains 2 g of solute dissolved in 100 cm³ of water.

Solution 5 contains 0.5 g of solute dissolved in 100 cm³ of water.
Order these solutions from the least to the most concentrated.

1

⇔

Solution A has a concentration of 0.01 g/dm³

2

⇔

Solution C has a concentration of 0.1 g/dm³

3

⇔

Solution D has a concentration of 1 g/dm³

4

⇔

Solution B has a concentration of 100 g/dm³
How many dm³ is 5000 cm³?

0.005

0.5

5 ✓

5000

What does the concentration of a solution refer to?

the mass of solvent used

the volume of solvent used

the mass of solute used

the volume of solute used

the mass of solute dissolved in a specific volume of solvent ✓
What unit is commonly used to measure the concentration of a solution?

g/mL

g/dm³ ✓

N/m³

L/mg
How can you increase the concentration of a solution?

by adding more solvent

by diluting the solution

by adding more solute ✓

by decreasing the temperature
Convert 2.5 dm³ into cm³?

0.0025

0.25

25

2500 ✓
If 10 grams of salt is dissolved in 500 cm³ of distilled water, what is the concentration in g/dm³?

5 g/dm³

10 g/dm³

20 g/dm³ ✓

30 g/dm³
How much distilled water needs to be added to 1 dm³ of a 40 g/dm³ solution to dilute it to 20 g/dm³?

0.5 dm³

1 dm³ ✓

2 dm³

4 dm³

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Concentration of a solution is the mass of solute dissolved in 1 dm³ of distilled water, in g/dm³.
The more solute that is dissolved, the more concentrated the solution.
Solutions can be diluted (i.e. made less concentrated) by increasing the volume of distilled water.
Diluting solutions with distilled water ensures no other substances are present in the solution.
Volume can be measured in various units; 1 dm³ is equivalent to 1000 cm³.

Pupils often confuse the chemical definitions for 'concentration' and 'strength'.

Stress that concentration is a measure of particles interspersed throughout a specific volume of liquid.