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March 29, 2024, 03:44:08 pm

Author Topic: VCE Chemistry Question Thread  (Read 2313580 times)  Share 

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matildalwhite

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Re: VCE Chemistry Question Thread
« Reply #6255 on: April 24, 2017, 02:17:21 pm »
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Hi everyone,

We did a chem prac on rates of reactions. The whole class got the same result that the lower the concentration the higher the rate of reaction. This contradicts what is in the textbook. However, on our sac we are being asked why the lower concentration produced a faster result. I was just wondering whether anyone could pretty please help me with this question?

Thanks a billion!!!!!

ImmaculateJeff

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Re: VCE Chemistry Question Thread
« Reply #6256 on: April 24, 2017, 07:00:27 pm »
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Help

zxcvbnm18

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Re: VCE Chemistry Question Thread
« Reply #6257 on: April 24, 2017, 09:20:53 pm »
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Are all reactants in fuel cells gaseous?

ImmaculateJeff

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Re: VCE Chemistry Question Thread
« Reply #6258 on: April 24, 2017, 10:15:59 pm »
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Are all reactants in fuel cells gaseous?
No

zxcvbnm18

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Re: VCE Chemistry Question Thread
« Reply #6259 on: April 24, 2017, 10:57:42 pm »
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No

Thnx and also are galavanic cells 100% efficient? If not why?

matildalwhite

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Re: VCE Chemistry Question Thread
« Reply #6260 on: April 25, 2017, 02:20:41 pm »
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Help!!
What does temperature vs reciprocal time graph achieve?!!?!?

Also what's a potential reason why the rate of the reaction increased as concentration of reactants decreased?

SOS

Thank you!!!!

rosiemac

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Re: VCE Chemistry Question Thread
« Reply #6261 on: April 25, 2017, 02:24:32 pm »
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Hi guys,
just wondering if voltage affects the different products formed in electrolysis. For one of our experiments, from aqueous copper chloride, we had chlorine gas forming. We didn't expect this, as water is a stronger reductant. Also, it wasn't to do with the concentration, as it copper chloride solution only had a concentration of 0.1M. Our teacher said it was to do with the voltage, but i'm confused why.
thank you!!!!!!!

-273.15

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Re: VCE Chemistry Question Thread
« Reply #6262 on: April 25, 2017, 04:31:42 pm »
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HI :)

How does the flow of ions affect the flow of electrons?
The salt bridge delivers ions to anode/cathode in order to maintain neutrality but why wont electrons flow if neutrality isn't maintained?? I don't understand how accumulation of charge actually prevents a galvanic cell from functioning

thanks

Quantum44

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Re: VCE Chemistry Question Thread
« Reply #6263 on: April 25, 2017, 04:44:50 pm »
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HI :)

How does the flow of ions affect the flow of electrons?
The salt bridge delivers ions to anode/cathode in order to maintain neutrality but why wont electrons flow if neutrality isn't maintained?? I don't understand how accumulation of charge actually prevents a galvanic cell from functioning

thanks

Well the salt bridge not only maintains neutrality but also completes the circuit. As with all electronics, the circuit needs to be complete for the galvanic cell to function.

UAdel MBBS

ImmaculateJeff

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Re: VCE Chemistry Question Thread
« Reply #6264 on: April 25, 2017, 09:38:28 pm »
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Thnx and also are galavanic cells 100% efficient? If not why?
I don't think you have to know if they are efficient or not

ImmaculateJeff

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Re: VCE Chemistry Question Thread
« Reply #6265 on: April 25, 2017, 09:39:47 pm »
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Anyone know of a really good chemistry tutor who'd go above and beyond for their students to achieve high scores??

Alexicology

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Re: VCE Chemistry Question Thread
« Reply #6266 on: April 25, 2017, 09:49:19 pm »
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Anyone know of a really good chemistry tutor who'd go above and beyond for their students to achieve high scores??


Jacks Tutor in Springvale
(removed personal details, PM user for this info)

He's a group tutor though but his teaching and notes is soooo goooood


Mod edit (insanipi): removed personal details.
« Last Edit: April 25, 2017, 10:08:45 pm by insanipi »

ImmaculateJeff

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Re: VCE Chemistry Question Thread
« Reply #6267 on: April 25, 2017, 09:52:21 pm »
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Jacks Tutor in Springvale
(Removed personal details)

He's a group tutor though but his teaching and notes is soooo goooood


I want one on one, but thanks anyway

Mod edit (insanipi)- removed the details from the quote. :)
« Last Edit: April 25, 2017, 10:09:56 pm by insanipi »

pmmenotes

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Re: VCE Chemistry Question Thread
« Reply #6268 on: April 30, 2017, 02:39:21 pm »
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Hey guys

So I'm doing a experiment on equilibrium for my SAC and were gonna have pre lab questions as well. My teacher said that it would have *something* to do with the equation Fe3+SCN--> Fe(SCN)2+. anyone who has done a sac on equilibrium involving that equation or anything on equilibrium pracs pls help give me an indication on what to prepare for/expect. Thank youuu Also the effect of dilituon on equilibrium may be on there as well?

Quantum44

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Re: VCE Chemistry Question Thread
« Reply #6269 on: April 30, 2017, 04:47:48 pm »
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Hey guys

So I'm doing a experiment on equilibrium for my SAC and were gonna have pre lab questions as well. My teacher said that it would have *something* to do with the equation Fe3+SCN--> Fe(SCN)2+. anyone who has done a sac on equilibrium involving that equation or anything on equilibrium pracs pls help give me an indication on what to prepare for/expect. Thank youuu Also the effect of dilituon on equilibrium may be on there as well?

We did our practical part of the SAC on that equilibrium system. It was pretty straight forward, we just added products or reactants, add chemicals that reacted with products or reactants (to remove them from the equilibrium system), diluted the system with water and changed the temperature.

Then you just had to explain the visual changes using knowledge of factors affecting equilibrium however there was a fairly tricky table. You just need to remember that the system partially opposes change, so for example if you dilute the system, even though the reactants are favoured, the reactant concentration will decrease because the dilution is stronger than the partial change.
UAdel MBBS