Structure & Bonding (Double) quiz

1. Why is the boiling point of a larger molecule higher than that of a smaller molecule?

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

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

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

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

Question 1 of 12

2. Do ionic substances conduct electricity?

No, ionic substances never conduct electricity

Yes, ionic substances always conduct electricity

Only when molten

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

Question 2 of 12

3. Describe the formation of a covalent bond

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

The sharing of a single electron between two nuclei

Question 3 of 12

4. A substance is found not to conduct electricity even when molten. What type of bonding does the substance have?

Ionic

Covalent

Covalent or ionic

Metallic

Question 4 of 12

5. Explain how the atoms are held together in a hydrogen bromide molecule

A single electron is transferred from bromine to hydrogen

A shared pair of electrons is attracted to one nucleus

A pair of electrons is transferred from bromine to hydrogen

A shared pair of electrons is attracted to 2 nuclei

Question 5 of 12

6. What is needed to complete this diagram to show the ionic bonding in magnesium chloride, MgCl₂ ?

1) eight electrons around the chloride (seven dots and one cross) 2) A charge of +1 on the magnesium and -2 on the chloride 3) A second chloride ion the same as the first

1) eight electrons around the chloride (seven dots and one cross) 2) A charge of +2 on the magnesium and -1 on the chloride 3) A second magensium ion the same as the first

1) eight electrons around the chloride (seven dots and one cross) 2) A charge of +2 on the magnesium and -1 on the chloride 3) A second chloride ion the same as the first

1) eight electrons around the magnesium (any combination of dots and one crosses) 2) A charge of +2 on the magnesium and -1 on the chloride 3) A second chloride ion the same as the first

Question 6 of 12

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

Solid or liquid

Any state

Gas or liquid

Solid

Question 7 of 12

8. 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 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

Question 8 of 12

9. In the dot and cross diagram of the outer electrons showing the covalent bonding in a molecule of hydrogen chloride (HCl), how many electrons should be shown in areas 1, 2 and 3?

There should be six electrons in area 1, two electrons in area 2, and six electrons in area 3

There should be one electron in area 1, two electrons in area 2, and seven electrons in area 3

There should be zero electrons in areas 1 and 3, and two electrons in area 2

There should be zero electrons in area 1, two electrons in area 2, and six electrons in area 3

Question 9 of 12

10. Explain, in terms of structure and bonding, why sodium chloride has a very high melting point

NaCl has a giant ionic structure with weak electrostatic forces between oppositely charged ions that require little energy to break

NaCl has a simple molecular structure with strong electrostatic forces between oppositely charged ions that require a lot of energy to break

NaCl has a giant ionic structure with strong electrostatic forces between oppositely charged ions that require a lot of energy to break

NaCl has a simple molecular structure with weak intermolecular forces that require little energy to break

Question 10 of 12

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

Graphite has delocalised protons which can move

Graphite has layers which can easily slide over each other

Graphite has delocalised electrons which can move

Graphite has positive ions which can move

Question 11 of 12

12. Explain the term ionic bond

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

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

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

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

Question 12 of 12

Structure & Bonding (Double) quiz

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