Howd you go on the chem exam?

[Studyinghard]

i got 19 C reactants are not stored in a fuel cell....

C is untrue (just like all of the answers, they stuffed up).
C stated that the electrons went from the reductant to the anode. The electrons go to the CATHODE, never to the anode

I thought it said electrons flow from the reductant through the anode, which would be true because they have to flow through the anode and then the external circuit before they get to the cathode.

No they didnt say through. this is the exact answer (i have the exam):
C. Electrons pass from the reductant to the anode as electricity is produced.

Ah ok, so what was the right answer?

im fairly sure 19 is D, as recharging of fuel cells and recharging of secondary cells both result in the conversion of electrical energy to chemical energy?

fuel cells are non rechargeable

[Shark 774]

i got 19 C reactants are not stored in a fuel cell....

C is untrue (just like all of the answers, they stuffed up).
C stated that the electrons went from the reductant to the anode. The electrons go to the CATHODE, never to the anode

I thought it said electrons flow from the reductant through the anode, which would be true because they have to flow through the anode and then the external circuit before they get to the cathode.

No they didnt say through. this is the exact answer (i have the exam):
C. Electrons pass from the reductant to the anode as electricity is produced.

Ah ok, so what was the right answer?

im fairly sure 19 is D, as recharging of fuel cells and recharging of secondary cells both result in the conversion of electrical energy to chemical energy?

But I thought the whole reason for a fuel cell was to not recharge...

[sajib_mostofa]

i got 19 C reactants are not stored in a fuel cell....

C is untrue (just like all of the answers, they stuffed up).
C stated that the electrons went from the reductant to the anode. The electrons go to the CATHODE, never to the anode

I thought it said electrons flow from the reductant through the anode, which would be true because they have to flow through the anode and then the external circuit before they get to the cathode.

No they didnt say through. this is the exact answer (i have the exam):
C. Electrons pass from the reductant to the anode as electricity is produced.

Ah ok, so what was the right answer?

im fairly sure 19 is D, as recharging of fuel cells and recharging of secondary cells both result in the conversion of electrical energy to chemical energy?

You can't recharge a fuel cell though

[10weid]

What did u guys get for that lithium metal question, exploding with water. I had no idea

I said something about the reaction producing H2, and this could somehow cause an explosion. No idea TBH.

gas accumulates, potentially leading to explosion..was in STAV 10 practice exam..

[Whatlol]

I just said concentration of H30+  = concentration of lacitic acid ions or w/e

[jayna]

i got 19 C reactants are not stored in a fuel cell....

C is untrue (just like all of the answers, they stuffed up).
C stated that the electrons went from the reductant to the anode. The electrons go to the CATHODE, never to the anode

I thought it said electrons flow from the reductant through the anode, which would be true because they have to flow through the anode and then the external circuit before they get to the cathode.

No they didnt say through. this is the exact answer (i have the exam):
C. Electrons pass from the reductant to the anode as electricity is produced.

Ah ok, so what was the right answer?

im fairly sure 19 is D, as recharging of fuel cells and recharging of secondary cells both result in the conversion of electrical energy to chemical energy?

Fuel cells are not recharged =\

[Studyinghard]

I just said concentration of H30+  = concentration of lacitic acid ions or w/e

I hope this is right

[mirra250]

It makes Li2O and H2 gas yeah? and h2 is highly combustible in air? hence BOOM?

that's what i did! and i mentioned that it may be exothermic, so the energy released initiated the explosion of the h2 gas

[10weid]

fuel cells CAN be recharged.... thus only D is correct...

just because they are not recharged in practice, doesnt mean they cant be recharged..

[Shark 774]

What did u guys get for that lithium metal question, exploding with water. I had no idea

I said something about the reaction producing H2, and this could somehow cause an explosion. No idea TBH.

gas accumulates, potentially leading to explosion..was in STAV 10 practice exam..

The gas combusts due to the heat released by the reaction is what I wrote.

[Studyinghard]

WHICH REACTANT WAS IN EXCESS QUESTION. the one where you mix urea and water. did everyone say water and reason because the reaction will completely occur with the urea

[mirra250]

I just said concentration of H30+  = concentration of lacitic acid ions or w/e

i said that all of the lactic acid dissolved in the water... simple but i hope correct?

[qshyrn]

What did u guys get for that lithium metal question, exploding with water. I had no idea

I said something about the reaction producing H2, and this could somehow cause an explosion. No idea TBH.

gas accumulates, potentially leading to explosion..was in STAV 10 practice exam..

The gas combusts due to the heat released by the reaction is what I wrote.

GAS PRODUCED= HIGH PRESSURE = BATTERY BURSTS

[Shark 774]

WHICH REACTANT WAS IN EXCESS QUESTION. the one where you mix urea and water. did everyone say water and reason because the reaction will completely occur with the urea

Yes I said to give a greater percentage conversion of urea to whatever the other one was.

[Studyinghard]

fuel cells CAN be recharged.... thus only D is correct...

just because they are not recharged in practice, doesnt mean they cant be recharged..

a new twist, i like it.