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mmcl2003 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15 16 17 18 19 20.

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Presentation on theme: "mmcl2003 1111 2222 3333 4444 5555 6666 7777 8888 9999 10 11 12 13 14 15 16 17 18 19 20."— Presentation transcript:

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3 mmcl What is an electric current ? A flow of electrons answer

4 mmcl What is an electrical CONDUCTOR ? A substance that allows electricity to pass through it answer

5 mmcl What is an electrical INSULATOR ? A substance that does NOT allow electricity to pass through it answer

6 mmcl What types of substances conduct electricity ? Metals Graphite (a form of carbon) Molten ionic compounds Solutions of ionic compunds answer

7 mmcl What types of substances do NOT conduct electricity ? Non - metals Solid ionic compounds Covalent compounds answer

8 mmcl What are electrolytes ? Ionic compounds that conduct electricity (The compound decomposes) answer

9 mmcl Describe how electrolytes conduct electricity? The movement of ions to electrodes answer

10 mmcl What type of particle flows through electrolytes during conduction? Ions answer

11 mmcl What type of particle flows through metals during conduction? Electrons answer

12 mmcl How do metals conduct electricity ? Electrons flow through the metal. The metal does NOT change chemically answer

13 mmcl Why do ionic solids NOT conduct electricity ? The ions are not free to move answer

14 mmcl What happens to the POSITIVE ions when an electrolyte conducts? The positive ions are attracted to the negative electrode. Here they GAIN electrons. This changes them into ATOMS. eg Cu e  Cu answer

15 mmcl What happens to the NEGATIVE ions when an electrolyte conducts? The negative ions are attracted to the positve electrode. Here they LOSE electrons. This changes them into ATOMS which can join to form molecules. eg 2Cl -  Cl 2 + 2e answer

16 mmcl Describe the structure of an IONIC solid An ionic solid consists of a network or LATTICE of oppositely charged ions answer

17 mmcl Describe the electron arrangement of ions? The electron arrangement of a Noble gas atom. This electron arrangement is stable answer

18 mmcl 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 mmcl Do ionic solids dissolve in water ? YES.Most Ionic solids DISSOLVE in water. The lattice breaks up and the ions spread out. answer

20 mmcl Which covalent compounds conduct electricity? NONE! answer

21 mmcl 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 mmcl What are the products of the electrolysis of copper chloride ? COPPER metal at the negative electrode and CHLORINE gas at the positive electrode. answer


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