Structure & Bonding (Double) quiz

1. What holds ions together?

Ions are held together by a strong magnetic attraction between the oppositely charged ions

Ions are held together by a strong electrostatic attraction between the oppositely charged ions

Ions are held together by a strong electrostatic attraction between the similarly charged ions

Ions are held together by a strong electrostatic attraction between the shared pair of electrons and their nuclei

Question 1 of 12

2. In the dot and cross diagram of the outer electrons showing the covalent bonding of ammonia (NH₃), how many electrons should be shown in areas 1, 2, 3 and 4?

There should be one electron in each of the areas 1, 2, 3 and seven electrons in 4

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

There should be 2 electrons in each of the areas 1, 2, 3 but none in 4

There should be one electron in each of the areas 1, 2, 3 and five electrons in 4

Question 2 of 12

3. Do ionic substances conduct electricity?

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

No, ionic substances never conduct electricity

Only when molten

Yes, ionic substances always conduct electricity

Question 3 of 12

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

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

Buckminsterfullerene has a simple molecular structure with weak intermolecular forces that require little 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 4 of 12

5. Typically, do covalent substances conduct electricity?

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

Depends on the substance

Yes

Question 5 of 12

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

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

There is a strong electrostatic attraction between similarly 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

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

Question 6 of 12

7. 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 7 of 12

8. 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 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) seven electrons around the sodium 2) one electon around the chloride 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

Question 9 of 12

10. 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 oppositely charged ions

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

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

Question 10 of 12

11. Explain why methane gas, CH₄, is a gas at room temperature

Methane has a giant covalent structure with many weak covalent bonds which require little energy to overcome

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

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

Methane has a giant covalent structure with many strong covalent bonds which require a lot of energy to overcome

Question 11 of 12

12. Explain, in terms of its structure, why graphite can conduct electricity.

Graphite has delocalised electrons which can move

Graphite has positive ions which can move

Graphite has delocalised protons which can move

Graphite has layers which can easily slide over each other

Question 12 of 12

Structure & Bonding (Double) quiz

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