Physical Science Test 5

Which of the following is NOT true regarding chemical bonds?

• Chemical bonds can form when atoms gain or lose electrons.
• Chemical bonds can form when atoms share electrons.
• Chemical bonds can form when electrostatic attractions hold atoms together.
• Chemical bonds form compounds that are less stable than the individual atoms involved.

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NGSS.HS-PS1-1

NGSS.HS-PS1-3

The octet rule states that atoms are generally most stable when ?????????

• they lose all their valence electrons.
• they have eight electrons in their valence energy level.
• they combine with other elements to form compounds.
• eight atoms form ring-shaped molecules.

Most atoms are unstable when they are not bonded to other atoms, true or false?

• True
• False

Molecules form only when different elements bond together, true or false?

• True
• False

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

• chemical bonding changes the properties.
• water is a pure nonreactive element.
• they consist of different elements.
• hydrogen and oxygen are a gas, and water cannot be a gas.

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NGSS.HS-PS1-1

An exception to the octet rule is ????????

• hydrogen
• helium
• lithium, beryllium, or boron
• all of these.

The properties of sodium chloride (table salt) are different from the properties of sodium and chlorine because ??????????

• chemical bonding changes the properties.
• sodium chloride is a pure nonreactive element.
• they consist of different elements.
• sodium is a metal and chlorine is a gas, but sodium chloride is a salt crystal.

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NGSS.HS-PS1-1

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Covalent bonding forms ??????????? , while ionic bonding forms ??????????.

• single bonds; double or triple bonds
• molecules; crystals
• polar molecules; nonpolar molecules
• diatomic molecules; Lewis structures

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NGSS.HS-PS1-1

Bonds most often formed between nonmetals are ?????????

• covalent
• ionic
• metallic

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NGSS.HS-PS1-1

Bonds resulting from two atoms sharing electrons are ????????

• covalent
• ionic
• metallic

Tags

NGSS.HS-PS1-1