Unit B The Chemistry of Materials (Part 1) Draw 2 pictures which represent this unit

After Title Page: Save 3 sides for vocabulary (25-26 words) Word Search here Save 5 sides for Unit B Major Concepts Save 4 sides for warm-up and study check points

Activity 11 Title: Choosing a Cleaner

Read pg. A-45 What will you need to consider when making a decision about which glass cleaner to purchase? –Cleaning ability? –Price? –Remember you are making a decision for a hospital –How will the product be used, stored and disposed of?

Problem: Which glass cleaner will you select for the hospital? Hypothesis/Initial Thoughts:

Data/Observation: Put Student Sheet 11.1, Comparing Glass Cleaners, in your notebook after Hypothesis/Initial Thoughts

Before you begin: Procedure step 1 Read and discuss the information about product ingredients shown on page A-47 (What is a Cleaner? Possible ingredients in a Glass Cleanser)

Procedure continued….. Procedure step 2 Assume that cleaning ability is based on perceived customer satisfaction, as determined by a limited unscientific survey of customers Environmental impact is based on estimated long term water system and ecosystem accumulation and effect Look at size when comparing cost (hint: there are 128 oz. in a gallon----convert to price per ounce)

Procedure continued….. Procedure step 3 Add two more factors that are not listed on Student Sheet 11.1 (Comparing Glass Cleaners) to the left-hand column under Reactivity with other chemicals. Suggestions: –Scent –Price –Environmental impact –Storage –Disposal

Procedure continued….. Read and follow procedure steps 4-6 on page A-46 Make sure to read and discuss information with your group as you fill in Student Sheet 11.1 (Comparing Glass Cleaners)

Do Activity 11

Follow-up………. Evidence can lead to a more informed decision, and often involve trade-offs Evidence: is an observation, data, or a reasonable inference that supports a decision or idea. Trade-off: is the act of giving up one thing to gain another. With trade-offs, the perfect decision or choice is not possible. In selecting the more important advantages of one choice, advantages of another choice are given up, or traded off.

What should you consider when looking at the trade-offs of purchasing a window cleaner? The cleaning crew will be using the product every day –Health –First aid –Toxicity Storage –It will be stored in a warm room Smell –It is being used in a public place Environmental impact –Container should be recyclable

Trade-off example: People often choose to lunch at fast food restaurants rather than bring a prepared lunch to work or eat at a sit-down restaurant Evidence to support fast food decision –Time required to get a meal at a fast food restaurant vs. time required to buy groceries and prepare a meal –Cost and time to eat at a sit-down restaurant Trade-offs –Give up a more nutritious meal –Cost savings by preparing your own meal –Convenience of eating quickly

Do Analysis 1-3 For question #1 –Answer a, b, and c as one paragraph rather than separately.