Covalent Properties

Which two of the following are examples of simple molecules?

• graphite

• silicon dioxide

• water

• carbon dioxide

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NGSS.MS-PS1-1

Why do simple molecular substances have low melting and boiling points?

• The intermolecular forces between simple molecules are weak.

• The covalent bonds holding the atoms together in a simple molecule are strong.

• A large number of covalent bonds hold the atoms together in simple molecules.

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NGSS.HS-PS1-3

What happens when a simple molecular substance melts or boils?

• The weak intermolecular forces between the molecules break.

• Strong covalent bonds between the atoms of the molecule break.

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NGSS.MS-PS1-2

NGSS.MS-PS1-4

Why do weak intermolecular forces between simple molecules result in low melting and boiling points?

• Little energy is needed to break the strong covalent bonds.

• Little energy is needed to break the weak intermolecular forces.

• Lots of energy is needed to break the weak intermolecular forces.

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NGSS.HS-PS3-4

Which two of the following are examples of giant covalent structures?

• graphite

• silicon dioxide

• water

• carbon dioxide

True of false? Giant covalent structures have low melting and boiling points.

• true

• false

True or false? All giant covalent structures conduct electricity.

• true

• false

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NGSS.HS-PS1-3

NGSS.HS-PS2-6

True or false? All giant covalent structures are hard.

• true

• false

When two atoms share electrons, a chemical bond is formed.  This type of bond is called:

• covalent bond

• ionic bond

• crystal bond

• polyatomic bond

Tags

NGSS.HS-PS1-1

Which of the following is a characteristic property of covalent compounds?

• High melting and boiling points

• Conduct electricity in molten state

• Low melting and boiling points

• Formed between metals and non-metals

Tags

NGSS.HS-PS1-1