Physical Science Ch. 5

Which of the following is not true regarding chemical bonds?

• Chemical bonds form compounds that are less stable than the individual atoms involved

• Chemical bonds can form when atoms gain or lose electrons.

• Chemical bonds can form when atoms share electrons.

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The octet rule states that atoms are generally most stable when

• eight atoms form ring-shaped molecules.

• they combine with other elements to form compounds.

• they have eight electrons in their valence energy level

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The properties of water are different from the properties of hydrogen and oxygen because

• chemical bonding changes the properties.

• hydrogen and oxygen are a gas, and water cannot be a gas

• they consist of different elements.

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Covalent bonding forms __________, while ionic bonding forms __________.

• diatomic molecules; Lewis structures

• molecules; crystals

• polar molecules; nonpolar molecules

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Why does diatomic nitrogen form triple bonds?

• Nitrogen needs three additional electrons to complete its octet

• Nitrogen is part of the Hydrogen Seven

• Diatomic nitrogen is a polar molecule.

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Which atom is most likely to take valence electrons in ionic bonding?

• . an atom found in diatomic molecules

• an atom found in polar molecules

• an atom with high electronegativity

Refer to a periodic table. Which of the following is the correct Lewis structure for potassium fluoride?

• K – F

• K = F

• 
• 

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How many atoms are represented by the chemical formula CuSO4?

• 3

• 4

• 6

• 7

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Refer to a periodic table. Which of the following chemical formulas would most likely represent the ionic compound potassium nitride?

• 
• 

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Refer to a periodic table. What ratio of ammonium ( NH4 + ) to chlorine (Cl– ) ions would you expect to find in ammonium chloride?

• 1:1

• 1:2

• 1:4

• 4:1

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