Friday, December 16, 2011
Apa benar.....
hati juga akan turut menangis
apa benar jika jiwa terluka
hidup juga akan turut menderita...
apa benar dalam persahabatan
akan terselit juga kejahatan
walau sekecil alam.
langsung tidak tersedar
mungkin juga aku lalai
masa berlalu
hati juga tidak mahu...
terluka dengan kata hati
mungkin jua buat aku mencaci
by: my pren FARRIS
Chemist berjiwa sastera...
Thursday, December 15, 2011
Jangan Sentuh
Wednesday, December 14, 2011
Weight per Volume
How to calculate??
1 - Start with the amount of solute you know to be present in the solution, expressed in grams.
And, how to covert from percent to molarity??
Write down the chemical formula for the compound in your solution. This formula will specify the elements in the compound and how many atoms of each element are in a molecule of that compound. If you had a salt solution, for example, you would write out the chemical formula for sodium chloride; NaCl.
Look up the atomic weight for each element in the chemical formula. You can find these weights on a standard periodic table of the elements. In the case of the example, the atomic weight of sodium (Na) is 22.99 and that of chlorine (Cl) is 35.45.
Multiply each element's atomic weight by the number of atoms of that element per molecule of compound. Add together all the products of those multiplications. The value you obtain will be the gram molecular weight of that chemical, in units of grams per mole. For NaCl, there is only one sodium atom and one chlorine atom per molecule, so you would calculate:
(1)(22.99) + (1)(35.45) = 58.44 grams per mole.
Multiply the value of percent concentration by 10. Since percent weight per volume is grams chemical per 100 milliliters solution, this calculation gives the grams of chemical in each liter of solution -- because there are 1,000 ml in a liter. If a solution of NaCl is 12 percent, you would multiply that value by 10 to determine there are 120 g of NaCl per liter.
Divide the value of grams you just calculated by the gram molecular weight of the chemical. This calculation provides the number of moles of chemical per liter of solution, which is the definition of molarity; at this point you have converted the original percent concentration into molarity. In the case of the NaCl solution, 120 g divided by 58.44 g per mole gives a molarity of 2.05.
**Make sure your percent concentration is a percent weight per volume, since there are other types of percent concentrations.
source: ehowTuesday, December 6, 2011
SAGA is not SAGA
Persoalan aku nak nyatakan di sini, kenapa Proton nak namakan kedua-dua kereta ni sebagai SAGA? Aku agak tidak bersetuju lah apabila SAGA ini dinamakan sebagai SAGA namun aku tade ape-ape hak mahupun share dalam syarikat Proton yang membolehkan aku menunjukkan ketidaksetujuan aku dengan penamaaan kereta ini sebagai SAGA.
Kenapa aku tak setuju?
Masih ingat kereta ini? SAGA ini sudah tiada di jalanan. Sudah kehilangan jejak. Hanya yang tinggal adalah satu nama iaitu SAGA. Namun namanya sudah di gantikan dengan model pacuan yang lain. Yang totally different.