Covalent Bonds and Their Properties

What is a key difference between covalent and ionic bonds?

• Covalent bonds form crystals.

• Covalent bonds involve the sharing of electrons.

• Covalent bonds form between metals and non-metals.

• Covalent bonds involve the transfer of electrons.

Why do atoms form covalent bonds?

• To achieve a full outer shell of electrons by sharing.

• To lose electrons and become positively charged.

• To gain electrons and become negatively charged.

• To form a lattice structure.

Which of the following is an example of a covalent bond?

• Sodium chloride (NaCl)

• Magnesium oxide (MgO)

• Water (H2O)

• Calcium carbonate (CaCO3)

Which of the following is true about covalent substances?

• They conduct electricity well.

• They form between metals and non-metals.

• They create molecules, not crystals.

• They are always solid at room temperature.

What type of elements typically form covalent bonds?

• Metals and metals

• Non-metals and non-metals

• Noble gases

• Metals and non-metals

What is a characteristic of the bonds within covalent molecules?

• They are ionic in nature.

• They form a repeating pattern.

• They are strong and directed inward.

• They are weak and easily broken.

Why do covalent substances often have low melting and boiling points?

• Because they are always gases.

• Because the bonds within molecules are weak.

• Because the bonds between molecules are weak.

• Because they form a lattice structure.

How do covalent bonds affect the physical state of substances at room temperature?

• They are always solid.

• They are always liquid.

• They can be gases, liquids, or solids.

• They are always gases.

What happens when covalent substances dissolve in water?

• They split into ions.

• They remain intact and spread out.

• They form a lattice structure.

• They conduct electricity well.

Why are covalent substances poor conductors of electricity?

• Because they form a lattice structure.

• Because they have no free ions.

• Because they have free electrons.

• Because they are always solid.