Structure & Bonding (Double) quiz

1. Do larger molecules have higher or lower boiling points than smaller molecules?

Lower

Higher

It depends on which atoms are present

Size doesn\'t affect boiling point

Question 1 of 12

2. 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 is a smooth metal so creates a surface with little friction

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

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

Question 2 of 12

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

Solid or liquid

Gas or liquid

Any state

Solid

Question 3 of 12

4. Why do ionic substance have high melting and boiling points?

There is a strong electrostatic attraction between similarly charged ions, in a giant structure, which requires a lot of energy to overcome

There are weak intermolecular forces, in a simple molecular structure, which require little energy to overcome

There is a strong electrostatic attraction between oppositely charged ions, in a giant structure, which requires a lot of energy to overcome

There is a weak electrostatic attraction between oppositely charged ions, in a giant structure, which requires little energy to overcome

Question 4 of 12

5. State the fomula for the two ions in iron (II) sulfide

Fe²⁺ and S²⁻

Fe³⁺ and S³⁻

Fe⁺ and S⁻

Fe³⁺ and S²⁻

Question 5 of 12

6. Do ionic substances conduct electricity?

Not when solid, but they do when either molten or in solution

Yes, ionic substances always conduct electricity

No, ionic substances never conduct electricity

Only when molten

Question 6 of 12

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

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

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

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

Question 7 of 12

8. Typically, do covalent substances conduct electricity?

Yes

No

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

Depends on the substance

Question 8 of 12

9. What is needed to complete this diagram to show the ionic bonding in sodium chloride, NaCl ?

1) seven electrons around the chloride 2) one electon around the sodium 3) A charge of +1 on the sodium and -1 on the chloride

1) eight electrons around the chloride (seven dots and one cross) 2) A charge of -1 on the sodium and +1 on the chloride

1) eight electrons around the chloride (seven dots and one cross) 2) A charge of +1 on the sodium and -1 on the chloride

1) seven electrons around the sodium 2) one electon around the chloride 3) A charge of +1 on the sodium and -1 on the chloride

Question 9 of 12

10. Give the definition of a covalent bond

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

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

Strong electrostatic attraction between oppositely charged ions

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

Question 10 of 12

11. Describe the formation of a covalent bond

The sharing of a pair of electrons between two nuclei

The sharing of a single electron between two nuclei

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

The transfer of electrons from one atom to another

Question 11 of 12

12. In the dot and cross diagram of the outer electrons showing the covalent bonding in a molecule of ethane (C₂H₆), how many electrons should be shown in areas 1, 2, 3, 4, 5, 6 and 7?

There should be two electrons in each of areas 1, 3, 4, 5, 6 and 7, but none in area 2

There should be two electrons in each of areas 1, 2, 3, 4, 5, 6 and 7, and also two more on the outside of each hydrogen atom

There should be two electrons in each of areas 1, 2, 3, 4, 5, 6 and 7

There should be two electrons in each of areas 1, 2, 3, 4, 5, 6 and 7, and also seven more on the outside of each hydrogen atom

Question 12 of 12

Structure & Bonding (Double) quiz

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