Structure & Bonding (Double) quiz

1. Describe the formation of a covalent bond

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

The sharing of a pair of electrons between two nuclei

The transfer of electrons from one atom to another

The sharing of a single electron between two nuclei

Question 1 of 12

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

Fe³⁺ and S²⁻

Fe⁺ and S⁻

Fe³⁺ and S³⁻

Fe²⁺ and S²⁻

Question 2 of 12

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

Metallic

Ionic

Covalent or ionic

Covalent

Question 3 of 12

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

A giant structure held together by intermolecular forces

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 similarly charged ions

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

Question 4 of 12

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

Size doesn\'t affect boiling point

Lower

It depends on which atoms are present

Higher

Question 5 of 12

6. Explain why Silica, SiO₂ is a solid with a high melting point

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

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

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

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

Question 6 of 12

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

Graphite has positive ions which can move

Graphite has delocalised protons which can move

Graphite has layers which can easily slide over each other

Graphite has delocalised electrons which can move

Question 7 of 12

8. Give the definition of a covalent bond

Strong electrostatic attraction between oppositely charged ions

Strong electrostatic attraction between a postive ion and a sea of delocalised positive 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 8 of 12

9. When can ionic substances conduct electricity?

Only when molten

Never

In any state

When molten or dissolved

Question 9 of 12

10. 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 zero electrons in each of the areas 1 and 4, and four electrons in areas 2, 3

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

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

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

Question 10 of 12

11. 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 11 of 12

12. Explain why carbon dioxide gas, CO₂, is a gas at room temperature

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

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

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

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

Question 12 of 12

Structure & Bonding (Double) quiz

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