A My Hôme OWLV2 | Online teaching and learning resource from Ce [References] The population density of worms in a particular field is 33 worms per cubic meter of soil. How many worms would there be in the top meter of soil in a field that has dimensions c 1.50 km by 2.5 km?

A My Hôme OWLV2 | Online teaching and learning resource from Ce [References] The population density of worms in a particular field is 33 worms per cubic meter of soil. How many worms would there be in the top meter of soil in a field that has dimensions c 1.50 km by 2.5 km?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 121CP: On October 21, 1982, the Bureau of the Mint changed the composition of pennies (see Exercise 120)....

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3.37 If atypical grain of sand occupies a volume of 1.3 × 10-4 cm3, what is the volume (in cm3) of 1 mole of sand (ignoring the space between grains)? What is the volume in liters?
On 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).
About two centuries ago, Benjamin Franklin showed that 1teaspoon of oil would cover about 0.5 acre of still water. If you know that 1.0 x 104 m2= 2.47 acres and that there is approximately 5 cm3 in a teaspoon, what is the thickness of the 0.5-acre layer of oil? How might this thickness be related to the sizes of molecules?
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| 5. Calculate Medium fine steel wool has a strand diameter of 0.002 inch. If 100 g of this steel wool were burned, what mass of iron oxide would you expect to be produced?
About two centuries ago, Benjamin Franklin showed that 1 teaspoon of oil would cover about 0.5 acre of still water. If you know that 1.0 × 104 m2 = 2.47 acres and that there is approximately 5 cm3 in a teaspoon, what is the thickness of the 0.5-acre layer of oil? How might this thickness be related to the sizes of molecules?
2. The approximate radius of a nucleus, r, is given by the formula r = A (1.3x10-13 cm), where A is the mass number of the nucleus. What is the radius of the 37AI nucleus in decimeter. The atomic radius of the Al is approximately 143 pm. If the diameter of this atom were 1.00 km what would be the diameter of its nucleus (in ft)? Calculate also the percentage of the total volume of the aluminum atom that is occupied by the nucleus. A) 3.9x1014, 0.088, 3.0x10-6 B) 3.9x1014, 0.088, 2.0x10-8 C) 3.9x1014, 0.068, 2.0x10-6 D) 3.9x1014, 0.088, 2.0x10-6 E) none %3D of the above
Copper can be drawn into thin wires. How many meters of 34–gauge wire (diameter=6.304 × 10 in) can be produced from the copper in 5.00 lb of covellite, an ore of copper that is 66.0% copper by mass? (Hint: Treat the wire as a cylinder: Vof cylinder = arh; d of copper=8.95 g/cm*). %3D !!
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 average dollar bill is 1.8x107 nm long and weighs 0.987 g. The distance to the sun is 1.5x108 km. How many moles of dollar bills would be needed to span the distance to the sun?
Please answer this question correctly. Question: A solution is to be prepared in a laboratory. The solution requires 0.0465 mol of quinine (C20H24N2O2). What mass, in grams, should the laboratory technician obtain in order to make the solution? Below is a picture of how all the work should correctly look in this Dimensional Analysis format:
60. When tin comes in contact with the oxygen in the air, tin(IV) oxide, SnO2, is formed. Sn(s) + O2(g) SNO2(s) A piece of tin foil, 8.25 cm × 21.5 cm × 0.600 mm (d = 7.28 g/cm³), is exposed to oxygen. (a) Assuming that all the tin has reacted, what is the mass of the oxidized tin foil? (b) Air is about 21% oxygen by volume (d = 1.309 g/L at 25°C, 1 atm). How many liters of air are required to completely react with the tin foil? |D