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Chapter 2: Q43P (page 40)
Write thenotation for each atomic depiction
(a)
(b) 
(c)
In an element A represents the mass number and while Z represents atomic number of an element.
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Describe Thomson’s model of the atom. How might it account for the production of cathode rays?
List two differences between a compound and a mixture.
State the mass law(s) demonstrated by the following experimental results, and explain your reasoning:
Experiment 1: A student heats 1.27 g of copper and 3.50 g of iodine to produce 3.81 g of a white compound; 0.96 g of iodine remains.
Experiment 2: A second student heats 2.55 g of copper and 3.50 g of iodine to form 5.25 g of a white compound, and 0.80 g of copper remains.
Galena, a mineral of lead, is a compound of the metal with sulfur. Analysis shows that a 2.34-g sample of galena contains2.03 g of lead. Calculate the mass percent of lead and sulfur in galena.
The tap water found in many areas of the United States leaves white deposits when it evaporates. Is this tap water a mixture or a compound? Explain.
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