Chapter 1, Problem 1.67AE

An 18 g sample of water is decomposed into 2 g of hydrogen gas and 16 g of oxygen gas. What masses of hydrogen and oxygen gases would have been prepared from 27 g of water? What law of chemistry is used in solving this problem?

A copy of your chemistry textbook is found to have a mass of 2.60 x103 grams. What is the mass of this copy of your chemistry textbook in ounces?

At 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?

You can figure out whether a solid floats or sinks if you know its density and the density of the liquid. In which of the liquids listed below will high-density polyethylene (HDPE) float? (HDPE, a common plastic, has a density of 0.97 g/cm3. It does not dissolve in any of these liquids.)

Ultrapure silicon is used to make solid-state devices, such as computer chips. What is the mass of a circular cylinder of silicon that is 12.40 cm long and has a radius of 4.00 cm? The density of silicon is 2.33 g/cm3.

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.

Analyses of several samples of a material containing only iron and oxygen gave the following results. Could this material be a compound?

In the accompanying photo, you see a crystal of the mineral calcite surrounded by piles of calcium and carbon, two of the elements that combine to make the mineral. (The other element combined in calcite is oxygen.) Based on the photo, describe some of the physical properties of the elements and the mineral. Are any properties the same? Are any properties different? Calcite (the transparent, cube-like crystal) and two of its constituent elements, calcium (chips) and carbon (black grains). The calcium chips are covered with a thin film of calcium oxide.