The same mass of powdered magnesium carbonate is added to each of the following solutions. In which solution is the shortest time taken for the magnesium carbonate to dissolve completely?
A. 50 cm^3 of 1.0 mol dm^-3 nitric acid
B.50 cm^3 of 1.0 mol dm^-3 HCl
C. 50 cm^3 of 1.0 mol dm^-3 sulphuiric acid
D. 100 cm^3 of 1.0 mol dm^-3 ethanoic acid

Is the answer C? More H.

Ok, more hydrogen. More acidic. Ionises more completely to form hydrogen ions. I hope I got it correct. It's been months since I finished my SPM!

Yes, my friend. Please correct me if I'm wrong. Anyway, is that form 4 or form 5 topic?

You can still consider studying in Science stream taking up Accounts subject.

it differs for each schools here, my friend and as for me, i totally disagree with you. my school is one of the best here in sarawak and the preparations the teachers gave us are actually above the par. that is why most of the students of our school find it quite easy. besides, it depends on the students themselves to do the preparations. you should have needed to expect for the worse and did more preparations.

someone refresh me back on the meiosis and mitosis again please!

sorry im late. what's endothermic reaction and exothermic reaction? ok just picture it.

endothermic reaction = inhaling. the graph go upwards because you are inhaling. and the temperature decreases because you're inhaling air into your body.

exothermic reaction = exhaling. the graph goes downwards because you're exhaling air. the temperature increasing because warm air is exhaled out from your body

that is how i remember them. hope you understand. haha.

LOL.. Early preparations is better than last minute preparations, my friend. I have just finished my SPM last year. And my friend, Vick here is only form 5 this year but he has almost gone through all the Form 5 syllabus earlier than all the form 5 students here.

vick is darn hardworking than the other students. he loves physics and chemistry. and if you guys happen to add him in msn, you'll see his personal messages are all the english idioms and proverbs.. sometimes when i'm busy playing games, he would buzz me up and asks me lots of questions. haha. i think he's currently on a secret intensive study program to be the best SPM scorer of year 2009!

you should, C-Note. anyway, how old are you now may i ask?

nope. im going for my A Levels soon at TARC, most probably.

i'm planning to take physics, chemistry, maths and further maths for my A levels. A.maths is seriously an important subject you have to master properly during seconday school.

it's still not too late to catch up now. focus more on integration, differentiation, graph, circles.. in my spm paper, a lot of such questions came out.

hi, heartz91. may intake?

vectors is still ok. for me, i think the circles, integration, differentiation and statistic is quite q problem. anyway, just do lots of constant exercises.

approximation? tell me more please.

vick is a smart student. FYI, he has gone through all the form 5 subjects during the holidays.

it's in the book. go refer success biology reference book. it's all inside there, my friend.

oh hi. im planning to take up physics, chem, maths for my A Levels at TARC. sent my application form 2 days ago. just waiting for their results now. thanks for asking anyway.

of course, my friend. everything needs practice. practice makes perfect.