Mixtures and Solutions Overview

Chemistry is the study of the structure of matter and the changes or transformations that take place in it. Learning about the makeup of substances gives us knowledge about how things go together and how they can be taken apart. Learning about changes in substances is important for several reasons: changes can be controlled to produce new materials; changes can be used to give off energy to run machines. The Mixtures and Solutions Module has four investigations that introduce students to these fundamental ideas in chemistry.


• Gain experience with the concepts of mixture and solution.
• Gain experience with the concepts of concentration and saturation.
• Gain experience with the concept of chemical reaction.
• Apply an operational definition to determine the relative concentrations of solutions.
• Use group problem-solving techniques to plan investigations.
• Use measurement in the context of scientific investigations.
• Apply mathematics in the context of science.
• Acquire vocabulary associated with chemistry and the periodic table.
• Be introduced to the concept that all matter is made of very small particles called atoms and that atoms combine to form molecules.
• Use scientific thinking processes to conduct investigations and build explanations: observing, communicating, comparing, organizing, and relating.

Audio stories for mixtures and solutions

Big Ideas

Investigation 1
• A mixture combines two or more materials that retain their own properties.
• A solution forms when a material dissolves in a liquid (solvent) and cannot be retrieved with a filter.
• Evaporation can separate a liquid from a solid in a solution.
• The solid material separated by evaporation from a solution forms distinctive patterns.

Investigation 2
• Solubility is the property that substances have of dissolving in solvents. Solubility is different for different materials and can change with temperature and different solvents.
• A solution is saturated when as much solid material as possible has dissolved in the liquid.
• When equal volumes of two solutions made from the same ingredients are compared, the heavier one is the more concentrated solution.

Investigation 3
• Concentration expresses a relationship between the amount of dissolved material and the volume of solvent.
• The more material dissolved in a liquid, the more concentrated the solution.
• A concentrated solution can be made more dilute by adding solvent to the solution.

Investigation 4
• When a change results from mixing two or more materials, that change is a chemical reaction. A reaction results in new materials.
• Formation of a gas is one change that occurs in some reactions.
• Formation of a precipitate occurs in some chemical reactions.
• Not all chemicals react when they are mixed.

November 29

Review Test
Letter to Parents

November 30

Notes: Properties of Matter
HW: Properties of Matter

December 1

Investigation: Separating Mixtures
HW: Thinking about Mixtures

December 2

Notes: Mixtures
HW: More About Mixtures

December 5

Investigation: Separating a Salt Solution

December 6

Guided Reading: Mixtures and Solutions

December 7

Notes: Solutions
CW: There's More Than One Solution

December 8

Study Guide

December 9

Mixtures Quiz
Observing Crystals

December 12

Mystery Mixture

December 13

Ceiling Leak

December 14


December 15

Observing Crystals

December 16

Study Guide

December 17


December 18

Notebook Test

December 19

Guided Reading: Decompression Sickness

December 20

Math Extension 2

December 21

Reindeer Games

December 22

No School

December 23

No School

December 26 -30

Christmas Break

January 2

No School

January 3

No School

January 4

Citric Acid Saturation
HW: Lemonade

January 5

Citric Acid Investigation

January 6

Notes: Solubility Factors
HW: I am too full

January 9

Response Sheet
Saturation Puzzle

January 10

Saturation Puzzle Investigation

January 11

Temperature Affects on Solubility

January 12

Solubility Curves

January 13

Comparing Crystals

January 16

Grow Your Own Crystals
Study Guide

January 17


January 18

Notebook Test

January 19

Unit Test
Planner Check

January 20

Bullying Assembly

January 23

Review Test

January 24

Working with Solutions

January 25

Salt Concentration

January 26

early dismissal

January 27

teacher inservice - no school

January 30

Guided Reading: The Air You Breathe

January 31

Mystery Solutions

February 1

Notes: Density
HW: Density

February 2

A Matter of Density

February 3

Density Investigation

February 6

Floating Logs
Study Guide

February 7

Vocabulary Quiz

February 8

A Look at the Past

February 9

Notes: Periodic Table

February 10

Placing the Elements

February 13

Metals, Non-Metals and Metalloids

February 14

Element Project

February 15

Element Project

February 16

Element Project

February 17

Element Project

February 20

Fizz Quiz Observations

February 21

Response Sheet: Fizz Quiz
HW: If you did not finish

February 22

Guided Reading: What is Matter Made Of?

February 23

Notes: Compounds

February 24

Reactions in a Zip Bag

February 27

Periodic Table Trends

February 28

Chemical Compounds and Protractors

February 29

Snow Day

March 1

Notes: Chemical Properties and Changes

March 2

HW: Study Guide

March 5

Correct Study Guide

March 6

Notebook Test

March 7

Unit Test
Planner Check