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

12. Calderglen High School 10.How do metals conduct electricity ? Delocalised Electrons flow through the metal. answer

13. Calderglen High School 11.Why do ionic solids NOT conduct electricity ? The ions are not free to move answer

14. Calderglen High School 12.What type of structure is shown? Suggest a name Covalent Network. e.g. Silicon dioxide answer Image: BBC website

15. Calderglen High School 13.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

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

17. Calderglen High School 15.Describe the electron arrangement of ions? The electron arrangement of a Noble gas atom.The electron arrangement of a Noble gas atom. This means that they have a full outer energy levelThis means that they have a full outer energy level This electron arrangement is stableThis electron arrangement is stable answer

18. Calderglen High School 16.Why do molten ionic compounds conduct but ionic solids do not ? The ions in the MOLTEN substance are FREE TO MOVE. The ions cannot move in a solid. answer

19. Calderglen High School 17.Do ionic solids dissolve in water ? YES.Most Ionic solids DISSOLVE in water. The lattice breaks up and the ions spread out. answer

20. Calderglen High School 18. Which covalent compounds conduct electricity? NONE! answer

21. Calderglen High School 19. What are the typical STATES of ionic and covalent compounds ? All Ionic compounds are SOLIDS. Covalent compounds can be liquids, gases or solids with low melting points answer

22. Calderglen High School 20.How strong are the bonds between molecules? How does this affect properties such as melting point? The bonds between molecules are WEAK. This means that covalent molecules typically have low melting points. answer C O O C O O C O O C O O C O O

23. Calderglen High School 21.What type of structure is shown? Suggest a name IONIC LATTICE e.g. Sodium chloride (any metal / non metal compound) answer Image: BBC website

24. Calderglen High School 22.What type of structure is shown? Suggest a name Metallic e.g. Sodium, iron, copper…(any metal) answer Image: BBC website