Bonding III - Properties

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Bonding III - Properties
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1. What is an electric current ?
answer

• A flow of electrons

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2. What is an electrical CONDUCTOR ?
answer

• A substance that allows electricity to pass
  through it

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3. What is an electrical INSULATOR ?
answer

• A substance that does NOT allow electricity to
  pass through it

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4. What types of substances conduct electricity ?
answer

• Metals
• Graphite (form of carbon)
• Molten ionic compounds
• Ionic solutions

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5. What types of substances do NOT conduct
electricity ?
answer

• Non metals (except carbon Graphite)
• Solid ionic compounds
• Covalent compounds

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6. Complete the table?
answer
Structure Melting point Conductivity Conductivity Conductivity
Solid Liquid Solution
Metallic High N/A
Ionic High
Covalent molecular Low
Covalent network Very High N/A

• Yes Yes
• No Yes Yes
• No No No
• No No

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7. Fill in the typical melting points for these
structures. (i.e. high, low, v. high etc)
answer
Structure Melting point Conductivity Conductivity Conductivity
Solid Liquid Solution
Metallic Yes Yes N/A
Ionic No Yes Yes
Covalent molecular No No No
Covalent network No No N/A

• High
• High
• Low
• Very High

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8. Fill in the blanks to suggest structures.
(e.g. Ionic, Covalent molecular, Metallic,
Covalent network)
answer
Structure Melting point Conductivity Conductivity Conductivity
Solid Liquid Solution
Very High No No N/A
High No Yes Yes
Low No No No
High Yes Yes N/A

• Covalent Network
• Ionic
• Covalent Molecule
• Metallic

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9. What type of particle flows through metals
during conduction?
answer

• Delocalised Electrons

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10. How do metals conduct electricity ?
answer

• Delocalised Electrons flow through the metal.

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11. Why do ionic solids NOT conduct electricity ?
answer

• The ions are not free to move

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12. What type of structure is shown?Suggest a
name
Image BBC website
answer

• Covalent Network.
• e.g. Silicon dioxide

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13. What type of structure is shown? Suggest a
name for a substance with this type of structure.
answer

• Covalent molecular
• e.g. carbon dioxide (CO2)

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14. Describe the structure of an IONIC solid
answer

• An ionic solid consists of a network or LATTICE
  of oppositely charged ions

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15. Describe the electron arrangement of ions?
answer

• The electron arrangement of a Noble gas atom.
• This means that they have a full outer energy
  level
• This electron arrangement is stable

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Why do molten ionic compounds conduct but
ionic solids do not ?
answer

• The ions in the MOLTEN substance are FREE TO
  MOVE. The ions cannot move in a solid.

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17. Do ionic solids dissolve in water?
answer

• YES .Most Ionic solids DISSOLVE in water. The
  lattice breaks up and the ions spread out.

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18. Which covalent compounds conduct electricity?
answer

• NONE!

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19. What are the typical STATES of ionic and
covalent compounds?
answer

• All Ionic compounds are SOLIDS. Covalent
  compounds can be liquids, gases or solids with
  low melting points

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20. How strong are the bonds between molecules?
How does this affect properties such as melting
point?
answer

• The bonds between molecules are WEAK. This means
  that covalent molecules typically have low
  melting points.

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21. What type of structure is shown?Suggest a
name
Image BBC website
answer

• IONIC LATTICE
• e.g. Sodium chloride (any metal / non metal
  compound)

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22. What type of structure is shown?Suggest a
name
Image BBC website
answer

• Metallic
• e.g. Sodium, iron, copper(any metal)