Electrochemical Cells



1. ____ active metals give up electrons to _____ active metals.

2. If metals of different activities are placed in an __________, ________ will be transferred from the ____ active metal to the ____ active metal.

3. If a circuit of wires connects the two metals, the ________ will flow through these wires and can do ____. This is how an ___________ cell works.

4. An __________ cell uses chemical changes to produce ___________.

5. If several electrochemical cells are combined, they are called a _______ of electrochemical cells, or just a _______.

6. When an electrochemical cell uses a liquid as an electrolyte, it is called a ___ ____.

7. If the electrochemical cell uses a paste as an electrolyte, it is called a ___ ____.

8. A __________ _______ is an example of a battery of wet cells.

9. A __________ _______ is an example of a battery of dry cells.

10. The places where electrons leave or return to the electrochemical cell are called the _________.

11. Dry cell batteries commonly use ____ and ______ as electrodes.

12. Electrodes are __________ which carry electrons into or out of a cell.

13. The ____ is in the form of a can. The can holds the __________ paste, which has a ______ rod in the center.

14. The electrolyte in the paste of most dry cells is __________ _________.

15. Since _________ _________ is a base (an ________ substance), such cells are known as ________ batteries.

16. ______ can also be used as electrolytes for dry cells.

17. In the dry cell, the ____ gives up electrons which enter the paste electrolyte. The electrons then leave the dry cell through the ______ of the can.

18. The bottom of the can is commonly called the ________ terminal or the _______.

19. Electrons return to the dry cell by way of the ________ terminal (_____) and enter the carbon rod where they are ______ for reuse.

20. A dry cell can produce a maximum of _._ volts of electricity.

21. A six volt flashlight battery is composed of ____ dry cells.

22. One type of dry cell that is rechargeable is the ______ ______ battery or _____ battery.

23. The most common type of wet cell battery is the __________ _______.

24. An automobile battery uses the metals ____ and ____ _______.

25. The electrolyte in a automobile battery is ________ ____ mixed with _____.

26. In an automobile battery the lead gives up _________ to the lead dioxide. The electrons leave the battery by way of the ________ terminal (_______), go through the circuits of the car to do work, and return by way of the ________ terminal (_____).

27. Each wet cell produces a maximum of ___ volts of electricity.

28. A 12 volt battery would be composed of ___ wet cells.

29. A car battery is recharged by the car's _________ or __________.

30. The _________ or __________ generates a an electric current that flows in the ________ direction of the flow of electrons in the battery. This reverses the flow of electrons and places electrons back on the ____.

31. The car battery primarily produces electric current only to run the car's _______. Once the car engine is running, the __________ or _________ takes over and supplies the electric current to run all the features of a car which require electric current.

32. Another chemical source of electricity is the ____ ____.

33. The ____ ____ differs from wet and dry cells in that some of the materials that react are supplied from _______ of the cell.

34. In a fuel cell, ________ and ________ are supplied from outside of the cell.

35. At one electrode of a fuel cell hydrogen is _______, and at the other oxygen is _______.

36. In the fuel cell there is an electron ____ from the ________ to the ______.

37. _____ is the by-product of the chemical reaction in a fuel cell.

38. A drawback to the fuel cell is that is produces ______ ________ of __________.

39. Another drawback to the fuel cell is that hydrogen gas is very _________.

40. Oxygen gas has certain hazards associated with it, especially that of ____.

41. Electric current can be used to _________ many compounds.

42. The breakdown of any compound by the use of electric current is called ___________.

43. Bauxite is a compound containing both ________ and ______.

44. Electrolysis is used to separate the ________ from the ______, so that ________ can be made into useful materials.

45. An electric current is also used to separate water into ________ gas and ______ gas.

46. Electric current can also be used to _______ a metal on a conducting metal. This technique is called _____________.

47. _____________ is used to plate cheaper metals with metals which are resistant to _________ such as ____, ______, ______ and ________.

48. In electroplating, a _______ supplies electrons to the cheaper metal which is to be plated. The metal which is to be plated on to the cheaper metal is in a ____ solution which contains ________ ions. These ________ ions are attracted to the __________ charged electrons causing this metal to bind to the cheaper metal and plate it.

49. Much _______ is gold or silver plated.

50. Nails are plated with ____ to _________ them.

51. Screws and door knobs are often plated with _____ (an alloy of ______ and ____).

52. Automobile bumpers are something plated with _________.

Electrochemical Cells Notes