Chemistry - October 2006

can an answer be 286 degree celsius ?is this possible.

i solve this problem:

what is the temperture change when 8.92g of sodium[ 0.293cal/(g x degree celsius) loses 750 cal of heat energy?

given formula:

heat(cal)
________________
mass(g) x temperature change(degree celsius)

please show work and unit need to study for exams 4 more days

2006-10-06 01:55:09 · 12 answers · asked by Rose 2

given the formula of a compound or ion, is there any method or formula to know the number of sigma and pi bonds present and the structure of the molecule/ion?

2006-10-06 01:36:10 · 2 answers · asked by Anonymous

2: As additional salt is added to a dilute solution of salt, the boiling point of the solution ________
increases

decreases because salt tends to lower the boiling point of a solution

remains the same

none of the above




4: A sample of clay suspended in water is distilled. As distillation proceeds, the weight of the clay in the distilling flask _________
increases

decreases

remains the same because only the liquid is distilled off

none of the above


5: A sample of washing soda is placed in a beaker and exposed to the air. As the time of exposure to air increases, the weight of the contents of the beaker _____________
increases

decreases, the water contained in the soda evaporates

remains the same

none of the above


6: When a crystal of a salt is added to a supersaturated solution of the salt the number of crystals produced_____________
increase because adding additional crystal causes them to fall out of solution

decreases

remains the same

none of the above


7: As more solid sugar dissolves in water, the freezing point of the solution ______________
increases

decreases because by adding more and more sugar water in the solution is less

remains the same

none of the above

2006-10-06 01:22:44 · 2 answers · asked by Anonymous

Of in het Nederlands: kan iemand mij vertellen wat droge ether is?

2006-10-06 00:50:08 · 2 answers · asked by Johan 2

acid the step by step process

2006-10-05 23:51:29 · 3 answers · asked by Anonymous

like brother,cousion.

2006-10-05 22:27:31 · 5 answers · asked by CHANDAN B 1

2006-10-05 22:25:00 · 11 answers · asked by Grant 2

I have to make project on chemistry and i need website related to science

2006-10-05 21:29:44 · 9 answers · asked by beautiful 2

2006-10-05 21:20:07 · 7 answers · asked by Anonymous

at constant temperature,the heavier the gas molecules,the larger the average kinetic energy of the molecule

2006-10-05 20:46:15 · 4 answers · asked by johanna j 1

2006-10-05 20:45:34 · 8 answers · asked by Anonymous

instead of carbon based organisms

2006-10-05 19:17:49 · 4 answers · asked by Bleeble Blabble 3

1 - Cr(NO3)3+NA3PO4--->Cr3(PO4)3
2 - Pb(NO3)2 + NA3PO4----> Pb3(PO4)2
3 - AgNO3+NaI*-----> AgI*

PS - if you can do the total ionic equation it would be really helpful also.


* ---capital i

2006-10-05 19:14:09 · 2 answers · asked by ohmv87 4

this is how the experiment went: We first did an experiment proving Boyle’s law. 1) We got a meter stick with plastic tube tied to the stick with rubber bands and a stopper. 2) We recorded the atm in the lab room. 3) With the stopper removed we pored 1 cm of water in the tube so it was even on both sides of the tube. 4) We put the stopper on one side of the tubing. 5) We measure the level of the water on the side with the stopper, and the height of the whole side of the tube with the stopper. We did this in order to get the height of trapped air. 6) We recorded this volume in our lab book. We then recorded the level of the water on the open side of the tube. 7) we then added 10cm of water to the tube and recorded the value and did this until we reached the top of the tube.

2006-10-05 17:43:41 · 2 answers · asked by hockeyislife21 1

2006-10-05 17:40:01 · 8 answers · asked by ddelga2005 1

2006-10-05 17:32:42 · 3 answers · asked by SmoOth 1

2006-10-05 17:29:08 · 2 answers · asked by Anonymous

2006-10-05 17:28:52 · 5 answers · asked by ddelga2005 1

2006-10-05 17:12:36 · 7 answers · asked by Anonymous

2006-10-05 17:09:28 · 7 answers · asked by Anonymous

2006-10-05 17:07:39 · 5 answers · asked by Anonymous

2006-10-05 17:05:19 · 1 answers · asked by dil man 1

describe the relative energy release per gram of material of nuclear fusion of fission reactions versus those of chemical reactions. What does this have to do with E=mc2

2006-10-05 16:34:53 · 1 answers · asked by Rachel 2

I have a bottle of drying, clumpy white-out. It's over half-full. I suppose I could buy a new one, but I would like to know if there is any way to fix it instead. I was thinking about acetone, but I don't know. Any ideas? White-out is petroleum-based.

2006-10-05 16:30:22 · 12 answers · asked by NicoRobin 2

2006-10-05 16:27:08 · 2 answers · asked by Anonymous

hydrogen is an electropositive element. But 2 H atoms link together by covalency to form H molecule. in the formation both atoms attain their duplet by gaining an electron. but since H is electropositive placed in group 1A of the Periodic table it should not gain electron but, why it does so?

2006-10-05 16:03:26 · 4 answers · asked by rohit_gupta322 2

2006-10-05 15:48:51 · 6 answers · asked by SPONGEBOB SQUAREPANTS 1

for an object to lose weight but at the same time not lose mass? explain.

2006-10-05 15:43:57 · 13 answers · asked by techline210 2

2006-10-05 15:43:18 · 1 answers · asked by Anonymous

2006-10-05 15:40:06 · 5 answers · asked by Anonymous