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Chem in Context II Chapter 8
Terms in this set (24)
have one or more rings of carbon atoms
Hydrogen as a fuel?
Hard to store
where to get it
cant compete with gasoline
plentiful but REACTIVE
have to displace it - not practical
formula for displacing H2
Na + H2O --> NaOH(aq) +H2
Formula for displacing H2 (Zn)
Nz + H2SO4 --> ZnSO4 + H2
2nd Law of Thermodynamics
"unburn" water to hydrogen & oxygen (exothermic)
uses too much energy
Electrolysis of water (overall)
2H2O(l) → 2H2(g) + O2(g)
2H2O(l) → 4H+(aq) + O2 (g) + 4e-
4H+(aq) + 4e- → 2H2 (g)
Use sunlight to "split water" electrochemically.
TiO2 nano particle coated with dye
Other ways to get H2
current major source: 165kJ + CH4(g) + 2H2O(l) → 4H2(g) + CO(g)
Can you break H2 evenly
NO - cant break even!
efficiency of power point
H2 from a landfill?
247kJ + CO2(g) + CH4(g) → 2H2(g) + 2CO(g)
focused sunlight can be used as a source of heat to avoid fossil fuels
Is hydrogen reactive?
Can hydrogen be liquified?
Yes at =253 C
How can you transport hydrogen?
truck is preferred as a solid matrix
activated carbon, carbon nanotubes
contain H- (hydride) ions and very water reactive
formula for metal Hydrides
LiH(s) + H2O(l) → H2(g) + LiOH(aq)
formula for Li under pressure (absorbs H2)
2Li(s) + H2(g) → 2LiH(s)
Hydrogen Fuel Stations in US and Canada
how many stations in the works?
current fuel range
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