I’ve just learnt everything I needed to study today in under an hour. Thank you 😊

@MaChemGuy

6 жыл бұрын

Now that is QUICK! You're very welcome, glad they helped

@anakinvalentin1269

2 жыл бұрын

i realize I am kinda randomly asking but do anyone know a good website to stream new movies online ?

@anakinvalentin1269

2 жыл бұрын

@Chance Kellen thank you, signed up and it seems to work =) Appreciate it!

@chancekellen24

2 жыл бұрын

@Anakin Valentin happy to help :)

Never got taught this in class so thank you for explaining this so perfectly! Also, can the last example work for any fuel cells containing an alcohol, or is it just methanol? I have seen a question with an ethanol fuel cell on a paper. And Just for clarification, is a fuel cell a cell containing an alcohol?

so in alkaline fuel cells will OH- move to the anode ? that should be correct because its an anion

AMAZING!

@MaChemGuy

6 жыл бұрын

Angelin Augustine THANKS!!

superbb

For the methanol fuel cell how did you identify which is more electropositive when making the overall equation?

@siamsama2983

4 жыл бұрын

Well obvious way would be to use the electrode potentials, but I think in this case it's because well oxygen is an oxidising agent so it gets reduced coz it has empty p-orbitals that need filling up. Reduction always happens at the cathode.

can you explain why can't we use Hydrogen Fuel Cells on Airplanes/ Drones since they have much higher energy density than regular batteries?

@EthanHalsall

5 жыл бұрын

don't use batteries on planes lol

@clement_jacob

2 жыл бұрын

It will blow up

@sui9452

Ай бұрын

weight anf flammebale

Hi, do we need to remember the equations for fuel cells for OCR a, or will the equations be given? Thank you.

@MaChemGuy

6 жыл бұрын

Spec says equations will be provided

Isnt anode the positive electrode? 0:10

@MaChemGuy

6 жыл бұрын

CreaShunTV Hi there, common question this. At GSSE you study electrolysis where the electricity is supplied to the cell. In these the anode is positive and the cathode is negative. These cells work the opposite way as they create and electrical current. The anode is now negative and the cathode is positive. Interestingly, reduction always takes place at the cathode (redcat). Do a search on electrolytic cells (GCSE) and electrochemical cells (A level) if you’d prefer to check. Some teachers have messaged me to say they’ve been teaching it wrong to their A level students. Hope this helps.

So sir are there 2 types of fuel cells. Hydrogen Oxygen and Oxygen Methanol? these are the ones we need to know for OCR chem? also there can be 2 conditions acidic or alkali?

@MaChemGuy

4 ай бұрын

There are many types. They could give you any one of them. Just make sure you know what to do from the two half equations

How much of fuel cells are we meant to know? Has the spec changed?

@MaChemGuy

Жыл бұрын

From the spec Explanation that a fuel cell uses the energy from the reaction of a fuel with oxygen to create a voltage and the changes that take place at each electrode. Recall of fuel cells and equations will not be required. Relevant electrode potentials and other data will be supplied.

is there any reason why its 1/2 O2 ?

@umric

Жыл бұрын

to balance the oxygens

Hi can i ask you a question for ocr a do you need to know the redox equations for mno4 and iodine for redox equations by heart or are they given to us in the question in the exam. And thank you for the video

@MaChemGuy

6 жыл бұрын

Given in exam or you'll be given enough information to construct them

isn't anode positive and cathode negative?

@MaChemGuy

Ай бұрын

In an electrolysis cell yes. These are electrolytic cells