UNIT THREE COMPREHENSIVE REVIEW QUESTIONS (Chapters 11, 12, 13, 14, 15) 1. Descr
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UNIT THREE COMPREHENSIVE REVIEW QUESTIONS (Chapters 11, 12, 13, 14, 15) 1. Describe the phlogiston theory of combustion, discuss why it might seem reasonable, and explain how it was disproven and by whonm. 2. Who first proposed the modern periodic table of the elements, what principles were used in organizing the elements on the table, and what predictions did the table make when first proposed? 3. How did Rutherford's "gold foil" experiment disprove the "plum pudding" model of the atom and what model of the atom did Rutherford propose in its place? 4. What is meant by the line spectrum of an element? Give an example. Use the Bohr model of the atom to explain the fact that an element exhibits a line spectrum. 5. "The periodic table represents both a summary of many observations and a reminder of theories regarding the structure of the atom." Explain this statement. Use several elements as examples. 6. The element potassium reacts very violently and explosively when placed in water. A beginning chemistry student sees that a salt substitute contains potassium chloride, and warns you that it would be very dangerous to use in water Explain why the salt substitute would not be explosive in water. 7. Why are the gases hydrogen and chlorine diatomic, while helium and neon are gases? monoatomic les of three fossil fuels and the fuel values typical for each and explain the trend in fuel values. he concept of fuel value. Why is it ad entageous for a good transportation fuel to have a high fuel value?Explanation / Answer
Answer 1. c)
The atomic weight of sodium is approximately 23.
2. c) AlF3
3. d)
4. b) they will be chemically similar as they are in the same vertical column.
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