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Chapter 2: Q64P (page 83)
Are molecules present in a sample of BaF2? Explain.
There are no molecules present in a sample of BaF2 because it is an ionic compound.
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Which of the following scenes illustrate(s) the fact that compounds of chlorine (green) and oxygen (red) exhibit the law of multiple proportions? Name the compounds.
Which of the following are pure substances? Explain.
(a) Calcium chloride, used to melt ice on roads, consists of two elements, calcium and chlorine, in a fixed mass ratio.
(b) Sulfur consists of sulfur atoms combined into octatomic molecules.
(c) Baking powder, a leavening agent, contains 26% to 30% sodium hydrogen carbonate and 30% to 35% calcium dihydrogen phosphate by mass.
(d) Cytosine, a component of DNA, consists of H, C, N, and O atoms bonded in a specific arrangement.
An ionic compound forms when calcium (Z = 20) reacts with iodide (Z = 53). If a sample of the compound contains calcium ions, how many iodide ions does it contain?
Write the notation for each atomic depiction:
(a)
(b)
(c)
Use Dalton鈥檚 theory to explain why potassium nitrate from India or Italy has the same mass percents of K, N, and O.
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