Ch.1 - Chemical Tools: Experimentation & Measurement
Chapter 1, Problem 29
How many milliliters of water does the graduated cylinder in (a) contain, and how tall in centimeters is the paper clip in (b)? How many significant figures do you have in each answer?
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Textbook Question
Aerogels are transparent, low-density materials that are nearly 99.8% empty space and excellent insulators against hot and cold. The density of a silica-based aerogel is 3.0 mg/cm3. What is the density in units of g/m3? (LO 1.17)
(a) 3.0 * 10-3 g/m3
(b) 3.0 * 101 g/m3
(c) 3.0 g/m3
(d) 3.0 * 103 g/m3
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Textbook Question
Which block in each of the following drawings of a balance is more dense, red or green? Explain.
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Textbook Question
What is the temperature reading on the fol-lowing Celsius thermometer? How many sig-nificant figures do you have in your answer?
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Textbook Question
Assume that you have two graduated cylinders, one with a capacity of 5 mL (a) and the other with a capacity of 50 mL (b). Draw a line in each, showing how much liquid you would add if you needed to measure 2.64 mL of water. Which cylinder will give the more accurate measurement? Explain.
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Textbook Question
The following cylinder contains three liquids that do not mix with one another: water (density = 1.0 g/mL), vegetable oil (density = 0.93 g/mL), and mercury (density = 13.5 g/mL). Which liquid is which?
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Textbook Question
The following statements pertain to the development of the theory of combustion by the French chemist Lavoisier in the eighteenth century. Match the statement with the appro-priate step (observation, hypothesis, experiment designed to test hypothesis) in the scientific method (a) A metal is burned in a closed container, and the change in mass of the solid and volume of the gas is measured.
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