chemistry Watch

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Sahra
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#1
Report Thread starter 15 years ago
#1
sum1 plz tell me summin abt da rate of reaction between calcium carbonate + hydrochloric acid.
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shez
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#2
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#2
i think CaCO3 and HCL is fast, faster if the CaCO3 is in powder form, because of more surface area. hence more effective particle collisions between calc calb and HCL atoms. i think thats right anyway. hope i helped
MadNatSci
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#3
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Yeah, that's right. For substances to react their molecules have to collide in the right way - if the calcium carbonate is powdered it has a larger surface area - this means that the molecules of HCL and CaCO3 are more likely to collide with each other more often. If you do the reaction at a higher temperature it's faster as well - higher temperatures give the molecules more energy, so they move around faster and so collide more often. More frequent collisions = faster rate of reaction overall.

Let me know if you need more detail - the above is GCSE-ish level and I don't know exactly waht you're wanting
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Ralfskini
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(Original post by MadNatSci)
Yeah, that's right. For substances to react their molecules have to collide in the right way - if the calcium carbonate is powdered it has a larger surface area - this means that the molecules of HCL and CaCO3 are more likely to collide with each other more often. If you do the reaction at a higher temperature it's faster as well - higher temperatures give the molecules more energy, so they move around faster and so collide more often. More frequent collisions = faster rate of reaction overall.

Let me know if you need more detail - the above is GCSE-ish level and I don't know exactly waht you're wanting
Hey can you tell me about natural science interviews? I have one next month. thx
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MadNatSci
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Excellent, which college?! They're not the same at all the colleges but at mine (Sidney Sussex) I had two interviews. The first was a general one - it turned out to be with a guy who was actually a geneticist so it got a bit scientific in places, but the IDEA was it was general - and the second was scientific. I had two fellows and they sat on either side of me, which sounds really threatening but it really wasn't! In fact it kind of made it better - I was only looking at and talking to one of them at a time, rather than a 'panel' of two. Um. I don't really know what you want to know Drop me an email or MSN or something - [email protected] - if you want to know about the questions or anything. Are you biological or physical?
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