Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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A construction team gives an estimate of three months to repave a large stretch of a very busy road with their core crew of 9 people. The government responds that it is too much of an inconvenience to have this busy road obstructed for three months, so the job must be completed in one month.
If the relationship between construction time and crew members is inversely proportional, how many crew members does the construction team need if they are to complete the job in one month?
Express your answer as an integer.
Dimensional Analysis is a way of doing numerical "book-keeping"
when converting quantities or performing calculations.
• When converting quantities from one unit to another,
conversion factors are used.
Solving with Dimensional Analysis and Multiple Units:
If I am in Canada where the price of gas is $1.022 USD·L1, how
much will it cost me to fill up my gas tank if I travelled 125 km?
• Let's also assume that my car gets
an average of 30.0 miles/gallon.
The mass of one atom or molecule of a substance is given in atomic mass units, also called Daltons (abbreviated D or Da). Thus one molecule of water has a mass of
18.015 atomic mass units, or 18.015 Daltons. The atomic mass unit is defined such that one mole of water weighs 18.015 g. Suppose a protein has a mass of 64 192
Daltons (or 64.192 kDa). What would be the mass of one mole of this protein?
O A. A protein of 64 192 Da has a molar mass of 3.866 x 1028 g/mol.
B. A protein of 64 192 Da has a molar mass of 1.0 g/mol.
C. A protein of 64 192 Da has a molar mass of 18.015 g/mol.
D. A protein of 64 192 Da has a molar mass of 64.192 g/mol.
E. This question can't be answered without knowing the number of atoms in the protein.
F. A protein of 64 192 Da has a molar mass of 6.4192 x 10-2 g/mol.
G. A protein of 64 192 Da has a molar mass of 3.866 x 1025 g/mol.
H. A protein of 64 192 Da has a molar mass of 64 192 g/mol.
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- Some scientists think there are living things smaller than bacteria (New York Times, January 18, 2000, p. D1). Called nanobes, they are roughly cylindrical and range from 20 to 150 nm long and about 10 nm in diameter. One approach to determining whether nanobes are living is to estimate how many atoms and molecules could make up a nanobe. If the number is too small, then there would not be enough DNA, protein, and other biological molecules to carry out life processes. To test this method, estimate an upper limit for the number of atoms that could be in a nanobe. (Use a small atom, such as hydrogen.) Also estimate how many protein molecules could fit inside a nanobe. Do your estimates rule out the possibility that a nanobe could be living? Explain why or why not.arrow_forwardA 2.0-mer volume of hydrogen gas combined with 1.0 liter of oxygen gas to produce 2.0 liters of water vapor. Does oxygen undergo a chemical or physical change?arrow_forwardOn October 21, 1982, the Bureau of the Mint changed the composition of pennies (see Exercise 120). Instead of an alloy of 95% Cu and 5% Zn by mass, a core of 99.2% Zn and 0.8% Cu with a thin shell of copper was adopted. The overall composition of the new penny was 97.6% Zn and 2.4% Cu by mass. Does this account for the difference in mass among die pennies in Exercise 120? Assume the volume of the individual metals that make up each penny can be added together to give the overall volume of the penny, and assume each penny is the same size. (Density of Cu = 8.96 g/cm3; density of Zn = 7.14 g/cm3).arrow_forward
- What instrument would you use to (a) measure the length of your bed? (b) measure the amount of acid delivered by a beaker? (c) determine whether you have a fever?arrow_forwardAn electric current of 0.650 A flows for 1.0 second. Calculate the amount of electric, charge transported.. Be sure your answer has the correct unit symbol and 2 significant digits. 0 x10 ロ・ロ X μ = 5.:.arrow_forwardArchimedes, a famous Greek scientist, was given a problem by King Hieron II of Syracuse (Sicily). The king suspected that his crown, which was supposed to be made of pure gold, contained some silver alloy, and he asked Archimedes to prove or disprove his suspicion. (It turned out that the crown did not contain silver.) How would you experimentally determined whether or not the crown was pure gold? (Hint: The method came to Archimedes when getting into a full bathtub. See the footnote in Experiment 22 for Archimedes’ solution.)arrow_forward
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