Module 2 Intro

Module 2—Chemical Compounds

Reflect and Connect

The molecule used to make the non-stick coating in many types of cookware is shown below. Determine the polarity of this molecule. How does its polarity compare with water?

You may recall that oil and water do not mix. Oils are nonpolar substances, and as you will learn, polarity is an important consideration if you want substances to mix or to go into solution. In the case of cookware, a nonpolar surface provided by the non-stick coating repels water and most of the food particles, preventing their sticking.

Can you predict what might happen to the performance of non-stick cookware if the coating on the surface is scratched?

Reflect on the Big Picture

Knowledge of polar and nonpolar substances is essential in many industries. In the cleaning business, the removal of grease, oil, dirt, and other stains can be facilitated by using a compound with the “correct” polarity.

You may have seen stainfree and wrinkle-free fabrics. Take a look at the clothes that you wear—how many are made from special materials that prevent stains, are wrinkle resistant, are designed to stay dry (remove perspiration), and repel water?

Make a list of the fabrics that are used. Consider whether similar types of materials existed 100 years ago and, if so, what was used?

Briefly explain how polarity is involved in the function of current and past fabrics that were intended to have a function. Place a copy of your answers in your course folder.

Module 2: Lesson 3 Assignment

Retrieve the copy of the Module 2: Lesson 3 Assignment to which you have saved your previous work. Complete question 6. Save your work to your course folder.

After you have completed all parts of the assignment, submit a copy of your Module 2: Lesson 3 Assignment to your teacher.