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.

Objectives

• 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

Concert


December 15

Observing Crystals
Quiz


December 16

Study Guide


December 17

Review


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
Quiz







January 16

Grow Your Own Crystals
Study Guide


January 17

Review


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

Review
HW: Study Guide












March 5

Correct Study Guide


March 6

Notebook Test


March 7

Unit Test
Planner Check