Physical Science

Chapter 20: Chemical Bonds

Standardized Test Practice

1
How many electrons occupy the outer energy level of an atom that is chemically stable?
A)0
B)4
C)8
D)10
2
Which of the following statements about this molecule is true?

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A)The electrons are shared equally in the bonds of this molecule.
B)Hydrogen gained an electron and fluorine lost an electron.
C)Fluorine gained an electron and hydrogen lost an electron.
D)This molecule is polar.
3
According to the illustration, the electrons in the HF bond

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A)are located on the hydrogen more than on the fluorine atom.
B)are located on the fluorine more than on the hydrogen atom.
C)are always located around the flourine atom.
D)are always located around the hydrogen atoms.
4
To which major group do these elements belong?

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A)actinides
B)lanthanides
C)nonmetals
D)metalloids
5
When a group 7A element reacts with a group 1A element, what is the effect on the group 1A atom?
A)It becomes negatively charged.
B)It shares its electron with the other atom.
C)It forms a double bond.
D)It becomes positively charged.
6
Which of these elements could gain one electron to form an ionic bond with potassium?

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A)argon
B)chlorine
C)phosphorus
D)sulfur
7
How many electrons are required to complete the outer energy level of a phosphorous atom?

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A)1
B)2
C)3
D)4
8
How many electrons does a sulfur atom have?

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A)6
B)16
C)14
D)17
9
What is the formula for copper (I) sulfide?
A)CuS2
B)CuSO4
C)Co2S
D)Cu2S
10
What is the name of the compound whose formula is CaSO4?
A)calcium sulfoxide
B)calcium(II) sulfate
C)calcium sulfur tetroxide
D)calcium sulfate
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