Section 5.1: Team Learning Worksheet

Transcription

1 Name Section Date Group Members Section 5.1: Team Learning Worksheet 1. Check your calculator to make sure you know how to enter numbers in scientific notation. 2. Consider two numbers written in scientific notation. Which is larger, the number with the positive exponent or the number with the negative exponent? Explain. 3. Which of the following two measurements is larger? Explain your answer m m 4. Which of the following two measurements is larger? Explain your answer m m World of Chemistry 19 Copyright Houghton Mifflin Company.

2 5. For each of the following, choose the larger of the units. How much larger is it than the smaller unit? a. kg or g b. ml or L c. cm or dm 6. Convert each of the following to scientific notation. a m b L c g d cm World of Chemistry 20 Copyright Houghton Mifflin Company.

3 Name Section Date Group Members Section 5.2: Team Learning Worksheet 1. The first sentence of Section 5.2 states, Whenever a measurement is made an estimate is required. Why is an estimate required? 2. Look at Figure 5.3. Give an example of a volume you could record using this cylinder to the correct precision and explain your answer. 3. You are making a sandbox for your little sister. You first add 12.8 pounds of sand to the box, and then an additional 45 pounds. To what precision do you know the mass of sand in the sandbox? Explain the reasoning (do not just state a rule). 4. In an experiment you record 3.14 g of copper(ii) chloride. What range of numbers does your recorded mass imply? Explain. World of Chemistry 21 Copyright Houghton Mifflin Company.

4 5. Sketch two pieces of glassware: one that can measure volume to the tenths place and one that can measure volume to the thousandths place. Explain your answer. 6. Show how converting measurements to scientific notation can help you decide which digits are significant. 7. Complete the following and explain each in your own words: leading zeros are (never/sometimes/always) significant, captive zeros are (never/sometimes/always) significant, and trailing zeros are (never/sometimes/always) significant. For any with an answer of sometimes, give examples of when the zero is significant and when it is not and explain. World of Chemistry 22 Copyright Houghton Mifflin Company.

5 Name Section Date Group Members Section 5.3: Team Learning Worksheet 1. Calculate the number of minutes in a month using the following conversions: 365 days/year; 12 months/year; 24 hours/day; 60 minutes/hour. 2. Calculate the number of minutes in a month using the following conversions: 7 days/week; 4 weeks/month; 24 hours/day; 60 minutes/hour. 3. Compare the answers to numbers 1 and 2 above. Why are they different? Which do you think is more correct and why? 4. What data would you need to estimate what you would spend on gasoline to drive a car from New York to Los Angeles? Provide estimates of values and a sample calculation. World of Chemistry 23 Copyright Houghton Mifflin Company.

6 5. The following statement is made in Chapter 3 of the text: consider that if the nucleus were the size of a grape, the electrons would be about one mile away on average. Given that the average nucleus is cm in diameter and that electrons move around the nucleus at an average distance of 10-8 cm from it, is the above claim reasonably accurate? Provide mathematical support. 6. You invent an antifreeze for your car that has a boiling point of 105 C (which you call 100. A) and a freezing point of 14 C (which you call 0 A). Derive a formula between A and C and convert 28 C to A. 7. You have a sample of lead and a sample of aluminum, each with the same volume. You drop each in a separate beaker of water. How do the volumes of water that are displaced by the samples compare? Explain. World of Chemistry 24 Copyright Houghton Mifflin Company.