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Title More Model of Hydrogen Cars Being Tested
The (1) _______ of hydrogen fuel cell ● (2) ________ by Sir William Grove in 1839.
● Used in Apollo spaceships in the twentieth century.
● Used for transportation purposes.
Operating principle of P.E.M ● It has two sides divided by a thin membrane.
● Hydrogen gas from one side (3) _________ the active metal platinum.
● The electrons are (4) _________ from the protons in the hydrogen atoms.
● The protons pass through the fuel cell to the other side.
● Oxygen from the air is (5) __________ into the other side of the fuel cell.
● The gas meets the protons, and then water and heat are (6) __________.
Reasons for slow (7) ________ of hydrogen fuel cell cars ● There are many technical problems (8) ___________.
● The durability of the membranes in P.E.M. fuel cells is not clear.
● They have to start easily at (9) __________ temperatures and in dry climates.
● They must smaller and less costly before (10) __________ gasoline engines.
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