Chapter 3 - Chapter 3 Mass Relationships in Chemical...

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Page 39 Chapter 3: Mass Relationships in Chemical Reactions A periodic table will be required to answer some of these questions. 1. An atom of helium has a mass about four times greater than that of an atom of hydrogen. Which choice makes the correct comparison of the relative numbers of helium and hydrogen atoms in equal masses of the two elements? A) There are about four times as many helium atoms as hydrogen atoms. B) There are about two times as many helium atoms as hydrogen atoms. C) The number of helium and hydrogen atoms is the same. D) There are about half as many helium atoms as hydrogen atoms. E) There are about one-fourth as many helium atoms as hydrogen atoms. Ans: E Category: Easy Section: 3.1 2. There are two stable isotopes of chlorine: chlorine-35, with a mass of 34.968853 amu; and chlorine-37, with a mass of 36.965903. Given that the average atomic mass of a chlorine atom is 35.45 amu, which of the following statements is true? 3. An atom of bromine has a mass about four times greater than that of an atom of neon. Which choice makes the correct comparison of the relative numbers of bromine and neon atoms in 1,000 g of each element? 4. An atom of bromine has a mass about four times greater than that of an atom of neon. How many grams of neon will contain the same number of atoms as 1,000 g of bromine? 5. An average atom of uranium (U) is approximately how many times heavier than an atom of potassium? A) 6.1 times B) 4.8 times C) 2.4 times D) 12.5 times E) 7.7 times Ans: A Category: Easy Section: 3.1
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Chapter 3: Mass Relationships in Chemical Reactions Page 40 6. Boron obtained from borax deposits in Death Valley consists of two isotopes. They are boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table). Which isotope of boron is more abundant, boron-10 or boron-11?
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