Chapter 03 Mass Relationships in Chemical Reactions

Chapter 03 Mass Relationships in Chemical Reactions

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

Multiple Choice 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 redative 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.

Bloom’s Level: 4. Analyze
Difficulty: Easy
Gradable: automatic
Section: 03.01
Subtopic: The Mole (Definition and Avogadro’s number)
Topic: Stoichiometry and Chemical Reactions

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?
   A.

Chlorine contains almost exclusively CI with very little Cl.

Chlorine contains more Cl than Cl.

Chlorine contains roughly equal amounts of Cl and Cl.

Chlorine contains more Cl than Cl.

Chlorine contains almost exclusively of Cl, with very little Cl.

Bloom’s Level: 5. Evaluate
Difficulty: Easy
Gradable: automatic
Section: 03.01
Subtopic: The Mole (Definition and Avogadro’s number)
Topic: Stoichiometry and Chemical Reactions

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?
   A.The number of bromine and neon atoms is the same.
   B. There are one thousand times as many bromine atoms as neon atoms.
   C. There are one thousand times as many neon atoms as bromine atoms.
   D. There are four times as many neon atoms as bromine atoms.
   E. There are four times as many bromine atoms as neon atoms.

Bloom’s Level: 4. Analyze
Difficulty: Easy
Gradable: automatic
Section: 03.01
Subtopic: The Mole (Definition and Avogadro’s number)
Topic: Stoichiometry and Chemical Reactions

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?
   A.4 g Ne
   B. 250 g Ne
   C. 400 g Ne
   D. 1,000 g Ne
   E. 4,000 g Ne

Bloom’s Level: 4. Analyze
Difficulty: Medium
Gradable: automatic
Section: 03.01
Subtopic: The Mole (Definition and Avogadro’s number)
Topic: Stoichiometry and Chemical Reactions

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

Bloom’s Level: 4. Analyze
Difficulty: Easy
Gradable: automatic
Section: 03.01
Subtopic: The Mole (Definition and Avogadro’s number)
Topic: Stoichiometry and Chemical Reactions