SPM Thread 08/09 (V 3), SPM is coming soon..!!!! Final days..!!
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 Oct 27 2008, 03:15 PM
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#1
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Senior Member
1,179 posts Joined: Jul 2005 From: SS2, Petaling Jaya, Selangor  
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QUOTE(ilovecookies92 @ Oct 27 2008, 02:36 PM) Guys, since there's so many pekas in Bio,Chem and Physics. How do you guys memorize all of them since the questions in SPM Peka will be randomly out. Only Peka? Isn't it all experiments? |
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Oct 27 2008, 03:53 PM
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#2
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Senior Member
1,179 posts Joined: Jul 2005 From: SS2, Petaling Jaya, Selangor
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QUOTE(Mu619 @ Oct 27 2008, 03:39 PM) Hey , I came across this question . It's something similar with the question about the concentration of hydrogen ions . From the looks of it, I will pick B.Which of the following has the highest concentration of hydrogen ion ? A . 20cm3 of 0.5mol dm-3 ethanoic acid B . 10cm3 of 1.0mol dm-3 sulphuric acid C . 5cm3 of 2.0 moldm-3 hydrochloric acid D . 1cm3 of 10.0mol dm-3 methanoic acid How to do ? A and D is out because they are weak acids that only dissociate partially. Both B and C has the same number of moles, but B is a diprotic acid, which means it has two hydrogen atoms. |
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