Recent content by chemzz

ILC chemistry course grade 12... anyone taking it?? I'm on Unit 2 and i need help with some experiments...anyone here taking that course?help would be appreciated... thnx:redface:

Solubility in Water (kg/kg H2O, 25degreescelcius) Melting Point NaF 0.042 988 NaCl 0.357 801 NaBR 1.16 755 Nai 1.84 651 Explain the decreasing melting point from NaF to Nai Explain the increasing solubility in the same order. Cesium fluoride has a melting point of 682degreesC and a...

Homework Statement Calculate the heat of combustion for C2H6 from the following information: C2H4+ 3O2----> 2 CO2 + 2 H2O (-1409.5kJ) C2H4 + H2 ----> C2H2 (-136.7 KJ) H2 + 1/2 O2 -----> H2O ( -285.5 kJ) The Attempt at a Solution C2H6 --> C2H4 + H2 +136.7kJ C2H4 + 302...

i don't get the questions they are asking: - Which of these types of packing has the least efficient arrangement of atoms? Justify your answer i think itz the body centered space lattice...buh i don't know why..coz maybe it seems to have more space - How do the two more efficient forms...

coz its 5!/3!2! which iz 5 x 4 x 3 x 2 x 1/ (3 x 2 x 1)(2 x 1) = 5 x 4 /2 x 1 = 20/2 = 10

doing the same experiment...i don't get it either:(

yup i understand it now...thnx for the correction:)

i did that and i get this: =(5C2)(0.326)^2(0.674)^3 = 10 x 0.106276 x 0.454276 = 0.48 is that right!

i'm stuck on this one too...:(

so then what should i do? how am i supposed to do this?

Homework Statement Gerry Infield has batting average of 0.326 what is the probability that he will have two hits in his next 5 times at bat?Give your answer correct to 3 decimal places. The Attempt at a Solution It is a binomial distribution with n trails and x sucesses (hence, n-x...

A student council is ordering pizza for their next meeting. There are 20 council members, 7 of whom are vegetarian. A committee of 3 will order 6 pizzas from a pizza shop that has a special price for large pizzas with up to three toppings. The shop offers 10 different toppings. a) How many...

here u go...:)

Name the following :ZnI2, BrF, FeSO3, CaH2, BaHPO3,CuNO3, AgIO, SO2 write the correct formula of these: zinc sulphate, barium nitrate, gold(III)nitrate, barium chloride, mercurous nitrate, antimony(V)cloride, ferrous bromide, calcium carbonate and hydrobromic acid. i have attempted them...

now do i get my answer?