1. The average weight of one hydrogen atom is: a. 1.008 g b. 1.008 amu c. 1.008
ID: 1078216 • Letter: 1
Question
1. The average weight of one hydrogen atom is:
a. 1.008 g b. 1.008 amu c. 1.008 mol d. 1.008 lb e. None of the above
2. The average weight of one mole of hydrogen atoms is:
a. 1.008 g
b. 1.008 amu
c. 1.008 mol
d. 1.008 lb
e. None of the above
3. In 2.0 moles of PCl3, there are:
a. six Cl atoms
b. two P atoms
c. 6.0 moles of Cl atoms
d. 3.0 moles of Cl atoms
e. None of the above
4. What is the mass percent of nitrogen of N2O5?
a. 25.9%
b. 28.6%
c. 40.0%
d. 50.0%
e. None of the above
5. The reaction: 2H2(g) + O2(g) 2H2O(g), can be interpreted as:
a. 2 moles of hydrogen gas reacts with 1 mole of oxygen gas to produce 2 moles of water.
b. 2 grams of hydrogen gas reacts with 1 gram of oxygen gas to produce 2 grams of water.
c. 2 hydrogen atoms react with 1 oxygen atom to produce 2 atoms of water.
d. 4 hydrogen atoms react with 2 oxygen atoms to produce 2 water molecules.
e. All these options are correct.
6. Which of the following statement(s) is(are) true for ionic bonding?
a. The electrons are shared between the atoms.
b. There is a large electronegative difference ( 2.0) between the atoms.
c. The bonding that occurs is usually between two nonmetal atoms.
d. The bonding that occurs is usually between metal and nonmetal atoms.
e. A noble gas configuration is formed by each element or ion.
7. True or false? The greater the difference in electronegativity between two bonded atoms is, the less polar the bond. a. True b. False
8. In what type of reaction is water always a product?
a. precipitation
b. acid-base
c. oxidation-reduction
d. decomposition
e. combustion
9. Draw the Lewis structures and determine the molecular structure of the following molecules. (a) SH2 (b) ClO3
Explanation / Answer
1. The average weight of one hydrogen atom is: a. 1.008 g b. 1.008 amu c. 1.008
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