Lesson 85Materials: one oxidized penny per student

Distilled vinegar

Beaker

Mr. Petersen

Bonneville Junior High

LESSON 858TH GRADE

Self Starter * 20 Points * 2/7/2015 * Lesson 85

•Today’s Learning Objective: Observe and describe chemical reactions involving atmospheric oxygen (e.g., rust, fire, respiration and photosynthesis).

•Essential Question: What causes molecules to move faster?

•Answer: Molecules will move faster when more heat is added.

•Homework: Nothing

8th Grade *Glossary List * Portfolio 4 [ 1]

1. Atom-

2. Molecules-

Assignment Log * Portfolio 6

Assignment Number

Assignment Title Lesson Number

1 Glossary 84-112

2 PowerPoint Questions Lessons 84 84

3 Deoxidize a Penny Lab 85

4

5

6

7

8

9

10

Student Read

•In Earth's atmosphere the air is made up of many different gases. The most common are nitrogen (78%), oxygen (21%), other gases (<1%), and water vapor in varying amounts. Some of the other gases that have a big effect are carbon dioxide and sulfur dioxide that come from burning of fossil fuels.

Student Read

•These gases in the air can and often do combine chemically with metals in Earth such as iron, aluminum, copper, tin, silver and gold to form new compounds that look much different than their parent material.

Teacher Read

•In the chemical reaction with iron nails the iron combines with the oxygen gas and the water vapor to form iron oxides which is also called rust. Sulfur dioxide can combine with water vapor to form acid rain, which has become a worldwide problem.

More on Oxidation! * 2:35

Student Read

•Silver plates and other silver objects can react with the oxygen in the air to form tarnish.

•Other chemical compounds are used to remove tarnish and help to restore silver back to its original shiny state. Corrosion control is big business.

•Now it time to clean an oxidized penny.

Lab Directions• Pass out the Lab Sheet

• Pass out a penny & beaker to each lab group.

• Pour water over the penny

• Leave the penny immersed in the water for 15 minutes.

• Show 15 minutes of the Bill Nye Video: Atoms

Lab Directions

•Remove the penny from the water and place on a paper towel. (Do not dry off!!)

•Leave the penny to dry for at least 12 hours.

•Show the rest of the Bill Nye Video: Atoms.

•Come back in lesson 86 and finish off the experiment.