1. Calderglen High School
Bonding - Properties
N3-4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
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2. 1. What is an electric current ?
answer
A flow of electrons
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3. 2. What is an electrical CONDUCTOR ?
answer
A substance that allows electricity to pass through it
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4. 3. What is an electrical INSULATOR ?
answer
A substance that does NOT allow electricity to pass through it
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5. 4. What types of substances conduct electricity ?
answer
Metals
Graphite (form of carbon)
Molten ionic compounds
Ionic solutions
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6. 5. What types of substances do NOT conduct electricity ?
answer
Non – metals (except carbon Graphite)
Solid ionic compounds
Covalent compounds
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7. Yes Yes No Yes Yes No No No No No
6. Complete the table?
answer
Structure
Melting point
Conductivity
Solid
Liquid
Solution
Metallic
High
N/A
Ionic
Covalent molecular
Low
Covalent network
Very High
Yes Yes
No Yes Yes
No No No
No No
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8. Calderglen High School
7. Fill in the typical melting points for these structures. (i.e. high, low, v. high etc)
answer
Structure
Melting point
Conductivity
Solid
Liquid
Solution
Metallic
Yes
N/A
Ionic No
Covalent molecular
Covalent network
High
Low
Very High
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9. Covalent Network Ionic Covalent Molecule Metallic
8. Fill in the blanks to suggest structures. (e.g. Ionic, Covalent molecular, Metallic, Covalent network)
answer
Structure
Melting point
Conductivity
Solid
Liquid
Solution
Very High No
N/A
High
Yes
Low
Covalent Network
Ionic
Covalent Molecule
Metallic
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10. 9. How do metals conduct electricity ?
answer
Electrons flow through the metal.
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11. 10. Why do ionic solids NOT conduct electricity ?
answer
The ions are not free to move
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12. Covalent molecular e.g. carbon dioxide (CO2)
11. What type of structure is shown? Suggest a name for a substance with this type of structure.
answer C O C O C O C O C O
Covalent molecular
e.g. carbon dioxide (CO2)
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13. 12. 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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14. 13. Why do ionic compounds conduct when molten but not when solid?
answer
Ions are FREE TO MOVE when MOLTEN.
Ions cannot move in a solid.
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15. 14. 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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16. 15.Do covalent compounds conduct electricity?
answer
NO!
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17. 16. 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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18. 17. What type of structure is shown? Suggest a name
Image: BBC website
answer
Metallic
e.g. Sodium, iron, copper…(any metal)
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