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Rec1 Measurement - CHEM 1251 Recitation Materials W eek 1...

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CHEM 1251 Recitation Materials Week 1 Recitation 1 : Page 1 of 6 Measurement and Math Review Name __________________ Partners _________________________________ Measurements are very important in science and one must be able to determine how good a measurement is. The activities in this recitation are designed so that you first explore what you already know about making and reporting measurements, using class data. You will refine your understanding of key ideas, and then apply and practice them in different contexts. Your Teaching Assistant (TA) and Learning Assistant (LA) will structure the activity so that you work with other students in small groups. This structure allows you to practice “talking chemistry,” and having to put your ideas into words that other people understand helps you to learn more and to connect ideas in your brain. Recitation is a great place to ask questions, ask for clarification, argue your ideas, and get feedback about your thinking—from other students, LAs, and TAs. Part I: How wide is this white board? Follow the written instructions on the chalkboard as you come into recitation. Class data: Reviewing the data: 1. What patterns you see in the data? Are there similarities across all the data? Any notable differences? How would you describe this set of data to someone over the phone? 2. What concepts do you already know that apply to this set of measurements?
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CHEM 1251 Recitation Materials Week 1 Recitation 1 : Page 2 of 6 Part II: Refining your measurement concepts and skills: Do the following within your small group of 3 – 5 students. a. Each student should measure the length of this line using a small plastic ruler. Use metric units!!!!! (Do you need to all measure the same line, on the same piece of paper? Why or why not?) b. As you make your measurement, write it on your group’s white board. You will use this set of data for the rest of this section. Questions: 1. Precision refers to how close together a series of measurements are. How precise are your group’s measurements? 2. Accuracy refers to how close the measured result is to the true value. However, most of the time the true value is not known with absolute certainty.
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