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Chapter 2: Q44P (page 40)
Write the notation for each atomic depiction:
(a)
(b)
(c)
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The elements inGroupsandare all quite reactive. What is the major difference between them?
Use Dalton鈥檚 theory to explain why potassium nitrate from India or Italy has the same mass percents of K, N, and O.
Dolomite is a carbonate of magnesium and calcium. Analysisshows that 7.81 g of dolomite contains 1.70 g of Ca. Calculate themass percent of Ca in dolomite. On the basis of the mass percentof Ca, and neglecting all other factors, which is the richer sourceof Ca, dolomite or fluorite (see Problem 2.20)?
What are some characteristic properties of elements to the left of the elements along the 鈥渟taircase鈥�? To the right?
Samples of illicit 鈥渟treet鈥� drugs often contain an inactive component, such as ascorbic acid (vitamin C). After obtaining a sample of cocaine, government chemists calculate the mass of vitamin C per gram of drug sample, and use it to track the drug鈥檚 distribution. For example, if different samples of cocaine obtained on the streets of New York, Los Angeles, and Paris all contain 0.6384 g of vitamin C per gram of sample, they very likely come from a common source. Do these street samples consist of a compound, element, or mixture? Explain.
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