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3. Calderglen High School 1.What is an electric current ? A flow of electrons answer

4. Calderglen High School 2.What is an electrical CONDUCTOR ? A substance that allows electricity to pass through it answer

5. Calderglen High School 3.What is an electrical INSULATOR ? A substance that does NOT allow electricity to pass through it answer

6. Calderglen High School 4.What types of substances conduct electricity ? Metals Graphite (form of carbon) Molten ionic compounds Ionic solutions answer

7. Calderglen High School 5.What types of substances do NOT conduct electricity ? Non – metals (except carbon Graphite) Solid ionic compounds Covalent compounds answer

8. Calderglen High School 6.Complete the table? answer StructureMelting point Conductivity SolidLiquidSolution MetallicHighN/A IonicHigh Covalent molecular Low Covalent network Very HighN/A Yes Yes Yes Yes No Yes Yes No Yes Yes No No No No No No No No No No

9. StructureMelting pointConductivity SolidLiquidSolution MetallicYes N/A IonicNoYes Covalent molecular No Covalent network No N/A Calderglen High School 7.Fill in the typical melting points for these structures. (i.e. high, low, v. high etc) HighHighLow Very High answer

10. StructureMelting point Conductivity SolidLiquidSolution Very HighNo N/A HighNoYes LowNo HighYes N/A Calderglen High School 8.Fill in the blanks to suggest structures. (e.g. Ionic, Covalent molecular, Metallic, Covalent network) Covalent Network Ionic Covalent Molecule Metallic answer

11. Calderglen High School 9.How do metals conduct electricity ? Electrons flow through the metal. answer

12. Calderglen High School 10.Why do ionic solids NOT conduct electricity ? The ions are not free to move answer

13. Calderglen High School 11.What type of structure is shown? Suggest a name for a substance with this type of structure. Covalent molecular e.g. carbon dioxide (CO 2 ) answer C O O C O O C O O C O O C O O

14. Calderglen High School 12.Describe the structure of an IONIC solid An ionic solid consists of a network or LATTICE of oppositely charged ions answer

15. Calderglen High School 13. Why do ionic compounds conduct when molten but not when solid? 13. Why do ionic compounds conduct when molten but not when solid? Ions are FREE TO MOVE when MOLTEN. Ions cannot move in a solid. answer

16. Calderglen High School 14.Do ionic solids dissolve in water ? YES. Most Ionic solids DISSOLVE in water. The lattice breaks up and the ions spread out. answer

17. Calderglen High School 15. Do covalent compounds conduct electricity? NO! answer

18. Calderglen High School 16.What type of structure is shown? Suggest a name IONIC LATTICE e.g. Sodium chloride (any metal / non metal compound) answer Image: BBC website

19. Calderglen High School 17.What type of structure is shown? Suggest a name Metallic e.g. Sodium, iron, copper…(any metal) answer Image: BBC website