Concept explainers
One of the particles in an atom is the proton. A proton has a radius of approximately
g. Determine the density of a proton. (Hint: Find the volume of the proton and then divide the mass by the volume to get the density.)
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Introducing Chemistry
- Gold leaf, which is used for many decorative purposes, is made by hammering pure gold into very thin sheets. Assuming that a sheet of gold leaf is 1.27 105 cm thick, how many square feet of gold leaf could be obtained from 28.35 g gold? The density of gold is 19.3 g/cm3.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_forwardAt 25 C the density of water is 0.997 g/mL, whereas the density of ice at 10 C is 0.917 g/mL. (a) If a plastic soft-drink bottle (volume = 250 mL) is completely filled with pure water, capped, and then frozen at 10 C, what volume will the solid occupy? (b) What will the bottle look like when you take it out of the freezer?arrow_forward
- A liquid with a volume of 8.5 mL has a mass of 6.71 g. The liquid is either octane, ethanol, or benzene, the densities of which are 0.702 g/cm3, 0.789 g/cm3, and 0.879 g/cm3, respectively. What is the identity of the liquid?arrow_forwardAn aluminum cylinder is 10.0cm in length and has a radius of 0.25cm. If the mass of a single Al atom is 4.48 x 10^-23 g, calculate the number of Al atoms present in the cylinder. The density of aluminum is 2.70 g/cm^3.arrow_forwardAbout 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?arrow_forward
- a thin sheet of nickel measured 5.00 cm by 7.00 cm was found to weigh .350 g. if the density of nickel is 8.90 g/cm3, what is the thickness of this sheet?arrow_forwardThe density of gold metal is 19.3 g/cm3, while that for silver is 10.5 g/cm3. Suppose you had the same size bar of each metal, with the dimensions 2.00 in x 10.0 cm x 760 mm. Volume of a cube is height x length x width. Which bar would have the greatest mass? Which bar contains the greater number of atoms? If the two bars were melted and mixed together to form an alloy (or mixture) what would be the total mass?arrow_forwardhe distance between atoms is sometimes given in pico-meters, where 1 pm is equivalent to 1 × 10^–12 m. If the distance between the layers of atoms in a particular compound is given as 568 pm, what is the distance in cm?arrow_forward
- In an old movie, an archeologist is shown sprinting off with a gold statue. If the volume of the statue was 3.78L (about the size of 1 gallon of milk), then calculate the mass of gold in pounds. Based upon your result, is what the movie suggested physically resonable? The density of gold is 19.3g/mLarrow_forwardWhat is the mass of 4.00 cm^3 of sodium, with a density of 0.97 g/cm^3?arrow_forwardCarry out each of the following calculations, paying special attention to significant figures, rounding, and units (J = joule, the SI unit of energy; mol = mole, the SI unit for amount of substance) (6.022 X 1 023 molecules/mol)( 1 .l 9 X 1 02 g) / 46.07 glmolarrow_forward
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