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September 28, 2025, 11:33:24 am
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Author Topic: STAV Publication 009 Short Answer Q 4  (Read 550 times)  Share 

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dinosaur93

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STAV Publication 009 Short Answer Q 4
« on: November 10, 2012, 06:28:15 pm »
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How do you provide explanation for questions like this?
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dinosaur93

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Re: STAV Publication 009 Short Answer Q 4
« Reply #1 on: November 11, 2012, 05:58:04 pm »
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anyone?
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Nobby

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Re: STAV Publication 009 Short Answer Q 4
« Reply #2 on: November 11, 2012, 06:09:36 pm »
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When the blocks are separated, H+ oxidises the nickel metal to Ni2+, causing H2 gas to bubble of the surface. The copper block remains undisturbed as the acid is not a strong enough oxidant to liberate electrons from it.

When the blocks are joined, however, a galvanic cell of sorts is formed. The nickel metal (anode) is oxidised to nickel ions, and the electrons are transferred to the copper (cathode), where H+ ions are reduced to H2 gas.
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