Properties of Compounds

Which three of the following are features of ionic compounds? (click 3 boxes)

• They have bonds between metals and non-metals.

• They have bonds between two non-metals.

• They form simple molecular structures.

• They form giant ionic lattices.

• They involve the transfer of electrons.

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Why do ionic compounds conduct electricity when they are molten or dissolved?

• Their ions are free to move.

• Their ions are held in fixed positions.

Which two substances are ionic compounds?

• sodium chloride (NaCl)

• carbon dioxide (CO₂)

• water (H₂O)

• magnesium oxide (MgO)

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NGSS.HS-PS1-3

Ionic compounds form giant ionic lattices. What forces hold the giant ionic lattices together?

• strong frictional forces between the surfaces of the atoms

• strong magnetic forces of attraction between the poles of ions

• strong electrostatic forces of attraction between oppositely charged ions

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True or False: a compound can have different chemical and physical properties than those of the elements it is made from.

• True

• False

Answer explanation

True because compounds have unique chemical and physical properties due to the arrangement of atoms and interactions between elements.

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NGSS.HS-PS1-3

This diagram shows a molecule of propane. What is propane?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

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Why do ionic compounds have high melting and boiling points?

• Their ions are free to move.

• Their ions are held in fixed positions.

• They have many strong bonds.

• They have many weak bonds.

True or false? Ionic compounds have high melting points.

• true

• false

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NGSS.HS-PS1-3

True or false? Ionic compounds have low boiling points.

• true

• false

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NGSS.MS-PS1-2

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At room temperature, are ionic compounds solids, liquids or gases? Justify your answer.( click 2 boxes)

• solids

• liquids

• gases

• Room temperature is lower than the melting points of ionic compounds.

• Room temperature is higher than the boiling points of ionic compounds.

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NGSS.MS-PS1-2

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