Amanda Tessier 101
(Saskatchewan Education - Chemistry 30 Online)

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Welcome to Chemistry 30! During our time together you will work independently through a number of units.

Energy changes accompany all chemical reactions. This module examines these changes in depth - you will learn how these energy changes can be measured experimentally and calculated from tables. You will also learn how to predict which chemical changes will occur on their own.

Chemical Kinetics
Some chemical reactions, such as the rusting of a nail, are relatively slow - although maybe not slow enough. Other reactions - an explosion for example - are extremely fast. Why are some reactions essentially instantaneous while others take so long it appears as though nothing happens at all?

This unit introduces the concept of reaction rates - how reaction rates can be measured and calculated. You will learn about the collision theory which provides the basis for our understanding of why reactions occur at different rates, and how the speed of a reaction can be altered.

In previous science classes you may have learned that one way to distinguish chemical changes from physical changes is that physical changes - such as the melting and freezing of water - are reversible but that chemical changes are not. In this unit we will see that this simple answer is not necessarily what it seems.

Solutions play a very important role in many biological, laboratory, and industrial applications of chemistry. Of particular importance are solutions involving substances dissolved in water, or aqueous solutions. Solutions represent equilibrium systems, and the lessons learned in our last unit will be of particular importance again. Quantitative measurements of solutions are another key component of this unit.

Solutions can involve all physical states - gases dissolved in gases (the air around us), solids dissolved in solids (metal alloys), liquids dissolved in solids (amalgams - liquid mercury dissolved in another metal such as silver, tin or copper). In this unit we will almost exclusively be concerned with aqueous solutions - substances dissolved in water.

Acids and Bases
Acids and bases are something you've certainly heard of before. Most of you will already know a thing or two about acids.
You may know something about the pH scale used to measure how strong an acid it. You've likely all heard of acid rain. Many of you might associate acids as being a little dangerous and know that you wouldn't want to spill any on yourself. Indeed some acids, and bases as well, are definitely very dangerous. However many of you will likely have already eaten or drank some acid today and splashed bases over your face and hands. And you all have a stomach full of acid right now.

Acids and bases are common substances found in many every day items, from fruit juices and soft drinks to soap. In this unit we'll exam what the properties are of acids and bases, and learn about the chemical nature of these important compounds. You'll learn what pH is and how to calculate the pH of a solution.

The rusting of an old car. A burning campfire. A toy battery-operated car. The chemical processes in your body that break down carbohydrates to produce water, carbon dioxide and energy. The ripening of fruit.

It's not easy to see what all of these types of reactions have in common, but they all belong to a very important category of chemical reactions known as oxidation - reduction, or redox, reactions.

Please send an e-mail containing some information about yourself (ie: e-mail address, city, likes, dislikes, why take Chem 30?)

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Athabasca University

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