Solutions Lesson

HISD 7th Grade Science

Unit 3: Aqueous Solutions
7.6D-E

3

LO:
SWBAT analyze data to describe aqueous
solutions in terms of solute and solvent,
concentration, and dilution.

DOL: Given a set of problems, students will analyze data to

describe aqueous solutions in terms of solute and
solvent, concentration, and dilution in at least 4 of 5
questions.

SCI.7.6D Describe aqueous solutions in terms of solute and solvent, concentration, and dilution.

Solutions

4

Vocabulary

5

Checkpoint
Question

Fill in the blank

https://www.youtube.com/watch?v=i4lTvRNkRP4




Click Here For Video

7

An aqueous
solution is a

solution in which

the solvent is

water.

Solution

8

Look at the solution of tea and water.
What do you think the terms diluted or
concentrated could mean?

Class
Discussion

8

The concentration
of a solution
describes how much
solute is dissolved in
a given amount of the
solvent. Decreasing
the concentration is
dilution.

​More Less
Water Water

10

Would increasing the amount of tea make this solution
more concentrated?
TRUE or False?

Checkpoint
Question

11

Water is the solvent because it
dissolves other substances. The
substance dissolved by the water is
called the solute. (fruit drink mix)

A student is making tea for a tea party.
Which glass is the MOST concentrated?
Brown=Tea (solute )
Clear=Water (solvent )

Checkpoint Question

16

Concentration

The amount of solute dissolved in a solvent.

Concentration is measured in grams of solute per liter of

solution.

Saturation

The maximum amount of solute that can be dissolved in

a solvent at a given temperature. A solution is saturated

when it can't dissolve any more solute.

14

Key Ideas: Solutions

Identify What is the
difference between
saturated, unsaturated, and
supersaturated?

View the video to review and
complete questions #1-3 in
the Saturated, Unsaturated,
and Supersaturated
Solutions section of your
student activity page.

13

Lesson Vocabulary

Solute

Solvent

Dilution

What is
being

dissolved

by the
solvent

Liquid

that

dissolves

the

solute

Solution
in which

the

solvent
is water

There is a

large

amount of

solute

( what is

being

dissolved )

There is

less solute

(what is

being

dissolved )

in a

solution

​Aqueous Concentration
Solution

15

LO:

SWBAT investigate the cause-and-effect relationship
between temperature and the rate of dissolution of
solutes in solutions.

DOL: Given a set of questions, students will correctly

investigate the cause-and-effect relationship between
temperature and the rate of dissolution of solutes in
solutions in at least 4 of 5 questions.

SCI.7.6E Investigate and model how temperature, surface area, and agitation affect the rate of dissolution of solid solutes in aqueous solutions.

Aqueous Solutions 7.6E ( part 2 )

17

Essential/Guiding Question

➢ What is the difference

between saturated
and unsaturated
solutions?

Answer the essential question

on a response card.

We will revisit
the Essential
Question at the
end of class.

The main difference between saturated, unsaturated, and supersaturated solutions is the amount of solute they can hold: 

• Unsaturated: A solution that can still hold more solute. 

• Saturated: A solution that has reached its maximum amount of solute. 

• Supersaturated: A solution that holds more solute than is theoretically possible at a given temperature. 

Saturation

18

Checkpoint
Question

A supersaturated solution holds more solute ?

TRUE? or
FALSE?

Saturation in solutions

19

A student is studying different aqueous solutions. They create the following table:

Which solution is the most concentrated?

A.

Solution A

B.

Solution B

C.

Solution C

D.

Solutions B and C have the same concentration.

“Solvent”

Checkpoint Question

20

Which of the following could
be an indicator of a saturated
solution ?

a. The solution is clear.
b. The solvent is boiling.
c. The solution is still
dissolving.
d. Solid solute settles and no more dissolves

Checkpoint Question

21

Essential/Guiding Question

➢ How does

temperature affect the
rate at which a solute
dissolves in a solvent?

Answer the essential question

on a response card.

We will revisit
the Essential
Question at the
end of class.

Let’s Discuss: Have you ever tried to dissolve sugar
inside a pitcher of lemonade filled with cold water?

Would you observe a difference if hot
water was used instead?

Let’s Discuss: Rate of Dissolution

The rate of dissolution refers to
how fast a solute dissolves in a
solvent. Temperature has a direct
effect on the rate of a solute
dissolving in a solvent.

Temperature:
Increasing the temperature of the solvent
allows the solute to dissolve more easily.

For example, dissolving a solute in hot water is
easier than dissolving a solute in cold water.

23

QUICK REVIEW: Previous Academic Vocabulary

Rate of
dissolution

The speed at which a
solute dissolves in a
solvent, essentially
measuring how fast a
substance breaks
down and mixes into a

solution .

How quickly can it dissolve?

24

What happens when the temperature of the solvent increases?

A: It increases how quickly it dissolves

B: It stays the same

C: It decreases how quickly it dissolves

D: It fluctuates “ goes up and down “

Checkpoint Question

Let’s Discuss: How does temperature affect the
rate of dissolution?

Provide your answer in the Let’s Discuss section
question #2 of your students activity page.

Key Idea: Rate of Dissolution (Temperature)

Heating the solvent speeds up the
process. The solvent molecules have
more energy causing an increase the
number of collisions of solvent and
solute molecules. The
rate of dissolution increases.

26

If you heat a cup of water, what will likely happen
to the sugar you add to it?

A. The sugar will dissolve more slowly.

B. The sugar will not dissolve.

C. The sugar will dissolve faster.

D. The sugar will form a solid.

Checkpoint Question

28

DOL: Given a set of

problems, students
will analyze data to
describe aqueous
solutions in terms of
solute and solvent,
concentration, and
dilution in at least 4
of 5 questions.

Demonstration of Learning