Lesson 1: Lab Fundamentals I
Wrap Up
That brings us to the end of Lesson 1. I recommend that you go back over the assumptions and objectives and be sure that you can do each one of them. Also, take the self-quiz for the lesson to give yourself some practice answering questions on this material. The self-quiz is posted here and also in your workbook at the end of the lesson. The answers to the self-quiz are available here and in the lab for you to check your answers.
You should have had all your questions on this lesson answered in one way or another as you went through the lesson. But if, for some reason, there are still some things that are puzzling to you, be sure to check with the instructor to get all of those things squared away before you decide that you are done with the lesson.
There is also a set of practice problems (for additional practice on significant digits and scientific notation) here and in your workbook for your practice.
What needs to be turned in for Lesson 1?
You do not have a formal lab report to do for this lesson. Instead, you will hand in your workbook pages with Exercises 28, 29, 30, and 31 (parts a, b, c, and d), along with a page of calculations and the graph that you made for Exercise 31 (parts a and b). You also need to complete the online homeowork for lesson 1, which is found on the Sapling Learning website.
Practice Problems | Practice Problem Answers | Self Quiz | Self Quiz Answers
Practice Problems
1. Give the number of significant digits in each of the following:
a. 2050 |
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2. Express each number in proper scientific notation:
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3. Perform the following conversions--use 3 significant digits: (NOTE: See your workbook for some conversion relationships.
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4. Express the answers to these to the proper number of significant digits:
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0.7210 |
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3 |
5. Express the answers to these in scientific notation and to two significant digits:
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(4.5 x 10-12) |
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Practice Problem Answers
1. 3, 4, 3, 3, 3.
2. 3.62 x 10-1 , 1.937 x 100 , 1.057 x 104 , 2.910 x 10-3
3. 1.50 cm, 79.2 m, 137 mg, 0.00780 L, 46.2 mL
4. 75., 9.50 x 10-4 , 2 x 101, 5.02, 0.0766
5. 7.4 x 10-5, 4.7 x 10-1, 7.9 x 107, 1.3 x 1019, 2.4 x 103
Self Quiz
Give your answers to the proper number of significant digits when appropriate. *Note: To get the most benefit from the self quiz, take it as though you are actually taking the quiz in class -- put away your notes and workbook and use only your calculator and your memory. If you can't answer a question, or are just guessing, then make a note of those questions and go back and review those sections.
1. A property of a material which does not depend on how
much of the material
you have is called an ________ property.
a. extrinsic b. intrinsic
2. 5.300 g =
3.10 mL
a. 2 g/mL b. 1.7 g/mL c. 1.7097 g/mL d. 1.71 g/mL e. 1.710 g/mL
3. Which of the following is an appropriate measurement for a Dial-o-gram balance?
a. 4 g b. 4.3 g c. 4.31 g d. 4.312 g e. 4.3123 g
4. Which of the following is an appropriate measurement for an electronic balance of the type we have in our lab?
a. 4 g b. 4.3 g c. 4.31 g d. 4.312 g e. 4.3123 g
5. Use the following data to calculate the density of the metal:
Volume of water in cylinder without metal 7.0 ml
Volume of water in cylinder with metal 9.0 ml
Mass of cylinder and water without metal 32.0 g
Mass of cylinder and water with metal 40.0 g
a. 0.25 g/ml b. 0.89 g/ml c. 4.0 g/ml d. 4.4 g/ml e. 10 g/ml
6. What is the volume of an object having a density of 2.0 g/ml and a mass of 5.0 g?
7. 25 cm =
a. 0.025 m b. 0.25 m c. 2.5 m d. 250 m e. 2500 m
8. Change 3.0 x 106 mm into meters.
a. 3.0 x 109 b. 3.0 x 106 c. 1.0 x 106 d. 3.0 x 103 e. 1.0 x 103
9. Which is larger: 1/2 gallon or 2 liters? (NOTE: 1.00 quart = 946 ml)
a. 1/2 gallon b. 2 liters
10. Chemists measure volume using this unit:
a. meter b. centimeter c. milliliter d. gram e. ounce
Self Quiz Answers
Here are the answers to the Lesson 2 Self-Quiz.
1. A property of a material which does not depend on how
much of the material
you have is called an ________ property.
*b. intrinsic
2. 5.300 g =
3.10 mL
*d. 1.71 g/mL
3. Which of the following is an appropriate measurement for a Dial-o-gram balance?
*c. 4.31 g
3. Which of the following is an appropriate measurement
for an electronic balance
of the type we have in our lab?
*d. 4.312 g
5. Use the following data to calculate the density of the metal:
Volume of water in cylinder without metal 7.0 ml
Volume of water in cylinder with metal 9.0 ml
Mass of cylinder and water without metal 32.0 g
Mass of cylinder and water with metal 40.0 g
*c. 4.0 g/ml
6. What is the volume of an object having a density of 2.0 g/ml and a mass of 5.0 g?
2.5 ml
7. 25 cm =
*b. 0.25 m
8. Change 3.0 x 106 mm into meters.
*d. 3.0 x 103
9. Which is larger: 1/2 gallon or 2 liters? (NOTE: 1.00 quart = 946 ml)
*b. 2 liters
10. Chemists measure volume using this unit:
*c. milliliter