Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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a) Explain how you can determine the density of an unknown liquid using a pycnometer.
b) A golden-colored cube is handed to you. The person wants you to buy it for $100, saying that is a gold nugget. You pull out your old geology text and look up gold in the mineral table, and read its density as 19.3 g/cm3. You measure the edge of the cube and find as 2 cm on each side, and weights as 40 g. What is its density? Is it gold or not? Please explain.
Lead has a density of 11.34 g/cm^3 and oxygen has a density of 1.31 x 10^-3 g/cm^3 at room temperature. How many cm^3 are occupied by 1g of lead? By 1 g of oxygen? Comment on the difference in volume for the two elements.
The Kohinoor Diamond ( d= 3.51 g/cm^3) is 108 carats. If one carat hasa mass of 2.00 x 10^3 mg , what is the mass of the Kohinoor Diamond in pounds? What is the volume of the diamond in cubic Inches?
A waterbed filled with water has the dimensions 8.0 ft x 7.0 ft x 0.75 ft. Taking the density of water to be 1.00 g/cm^3,how many kilograms of water are required to fill the waterbed?
Vinegar contains 5.00% acetic acid by mass and has a density of 1.01 g/mL. What mass(in grams) of acetic acid is present in 5.00 L of vinegar?
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- A basketball game at the University of Connecticut's Gampel Pavilion attracted 10,000 people. The building's in-terior floor space has an area of 1.71105 ft2. Tickets to the game sold for $22.00. Senior citizens were given a 20% discount. How many significant figures are there in each quantity? (Your answer may include the words ambiguous and exact.)arrow_forward1.69 The “Western Stone” in Jerusalem is one of the largest stone building blocks ever to have been used. It has a mass of 517 metric tons and measures 13.6 m long, 3.00 m high and 3.30 m wide. What is the density of this rock in g/cm3? (1 metric ton 1000 kg)arrow_forwardPrecious metals and gems are measured in troy weights in the English system: 24 grains 1 pennyweight (exact) 20 pennyweight = 1 troy ounce (exact) 12 troy ounces 1 troy pound (exact) 1 grain = 0.0648 g 1 carat = 0.200 g a. The most common English unit of mass is the pound avoirdupois. What is 1 troy pound in kilograms and in pounds? b. What is the mass of a troy ounce of gold in grams and in carats? c. The density of gold is 19.3 g/cm3. What is the volume of a troy pound of gold?arrow_forward
- The longest river in the world is the Nile River with a length of 4145 mi. How long is the Nile in cable lengths, meters, and nautical miles? Use these exact conversions to help solve the problem: ft = 1 fathom fathoms = 1 cable length cable lengths = 1 nautical mile nautical miles = 1 leaguearrow_forward1-31 In the SI system, the second is the base unit of time. We talk about atomic events that occur in picoseconds (10-12 s) or even in femtoseconds (10-15 s). But we don’t talk about megaseconds or kiloseconds; the old standards of minutes, hours, and days prevail. How many minutes and hours are 20. kiloseconds?arrow_forward1-51 A nurse practitioner orders isotonic sodium lactate 50. mL/kg body mass to be administered intravenously for a 139-lb patient with severe acidosis. The rate of flow is 150 gtts/min, and the IV administration set delivers 20. gtts/mL, where the unit “gtts” stands for drops of liquid. What is the running time in minutes?arrow_forward
- According to the Official Rules of Baseball, a baseball must have a circumference not more than 9.25 in or less than 9.00 in and a mass not more than 5.25 oz or less than 5.00 oz. What range of densities can a baseball be expected to have? Express this range as a single number with an accompanying uncertainty limit.arrow_forward1-15 In a newspaper, you read that Dr. X claimed that he has found a new remedy to cure diabetes. The remedy is an extract of carrots. How would you classify this claim: (a) fact, (b) theory, (c) hypothesis, or (d) hoax? Explain your choice of answer.arrow_forward1.30 The largest computers now include disk storage space measured in petabytes. How many bytes are in a petabyte? (Recall that in computer terminology, the prefix is only “close” to the value it designates in the metric system.)arrow_forward
- Two students were assigned to determine the mass of a sample of an unknown liquid. Student A used an ordinary laboratory balance that could determine mass to ±0.01 g. Student B used an analytical balance that could measure mass to ±0.1 mg. Each made four measurements, giving the following results: Student A: 8.19 g, 8.22 g, 8.21 g, 8.25 g Student B: 8.2210 g, 8.2210 g, 8.2209 g, 8.2210 g 2. Which student is more precise? A Barrow_forwardThe following are properties of substances. Decide whether each is a physical property or a chemical property. a Chlorine gas liquefies at 35C under normal pressure. b Hydrogen burns in chlorine gas. c Bromine melts at 7.2C. d Lithium is a soft, silvery-colored metal. e Iron rusts in an atmosphere of moist air.arrow_forward1-82 When the astronauts walked on the Moon, they could make giant leaps in spite of their heavy gear. (a) Why were their weights on the Moon so small? (b) Were their masses different on the Moon than on the Earth?arrow_forward
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