Structure & Bonding (Double) quiz

1. Describe the formation of a covalent bond

The sharing of a single electron between two nuclei

The sharing of a pair of electrons between two nuclei

The transfer of electrons from one atom to another

The electrostatic attraction between positive metal ions and a sea of delocalised electrons

Question 1 of 12

2. Why is the melting point of a smaller molecule lower than that of a larger molecule?

Larger molecules have more attractions between them. These take more energy to overcome.

Larger molecules have fewer attractions between them. These take less energy to overcome.

Larger molecules have more attractions between them. These take less energy to overcome.

Larger molecules have fewer attractions between them. These take more energy to overcome.

Question 2 of 12

3. If a substance has a simple molecular structure, what physical state might it be at room temperature?

Any state

Solid

Solid or liquid

Gas or liquid

Question 3 of 12

4. State the fomula for the two ions in vanadium (V) oxide

V⁵⁺ and O²⁻

V⁺ and O⁻

V²⁺ and O²⁻

There are no ions because it is covalent

Question 4 of 12

5. When can ionic substances conduct electricity?

Only when molten

Never

In any state

When molten or dissolved

Question 5 of 12

6. Typically, do covalent substances conduct electricity?

Depends on conditions (e.g. pressure, temperature etc.)

No

Depends on the substance

Yes

Question 6 of 12

7. Suggest why buckminsterfullerene, C₆₀, has a low melting point.

Buckminsterfullerene has a giant metallic structure with weak forces of attraction between layers

Buckminsterfullerene has a giant covalent structure with many strong covalent bonds that need a lot of energy to break

Buckminsterfullerene has a simple molecular structure with weak intermolecular forces that require little energy to overcome

Buckminsterfullerene has a simple molecular structure with strong intermolecular forces that require a lot of energy to overcome

Question 7 of 12

8. Describe the structure of an ionic compound, e.g NaCl

A giant structure held together by the attraction between positive metal ions and a sea of delocalised electrons

A giant structure held together by the attraction between oppositely charged ions

A giant structure held together by the attraction between similarly charged ions

A giant structure held together by intermolecular forces

Question 8 of 12

9. In the dot and cross diagram of the outer electrons showing the covalent bonding of carbon dioxide (CO₂), how many electrons should be shown in areas 1, 2, 3 and 4?

There should be six electrons in each of the areas 1 and 4, and two electrons in areas 2, 3

There should be two electrons in each of the areas 1, 2, 3 and 4

There should be four electrons in each of the areas 1, 2, 3 and 4

There should be zero electrons in each of the areas 1 and 4, and four electrons in areas 2, 3

Question 9 of 12

10. Explain the term ionic bond

An ionic bond is the strong electrostatic attraction between similarly charged ions

An ionic bond is the strong electrostatic attraction between a shared pair of electrons and two nuclei

An ionic bond is the strong electrostatic attraction between oppositely charged ions

An ionic bond is the strong magnetic attraction between oppositely charged ions

Question 10 of 12

11. Explain, in terms of its structure, why graphite can act as a lubricant.

Graphite has weak forces of attraction between layers. These layers can slide over each other

Graphite has strong forces of attraction between layers. These layers can slide over each other

Graphite is a smooth metal so creates a surface with little friction

Graphite has a low melting point so becomes liquid when heated by friction

Question 11 of 12

12. Give the definition of a covalent bond

Strong electrostatic attraction between a postive ion and a sea of delocalised positive ions

Strong electrostatic attraction between a shared pair of electrons and a nucleus

Strong electrostatic attraction between oppositely charged ions

Strong electrostatic attraction between a shared pair of electrons and two nuclei

Question 12 of 12

Structure & Bonding (Double) quiz

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