Chemistry - October 2006

I'm having trouble understanding the concept of how some ions have certain charges. All help appreciated!

2006-10-25 14:54:16 · 4 answers · asked by rockershocker 1

I'm asking for the chemical properties of O2 that makes a fire more favorable... is it something about O2 releasing energy and forming CO2?

2006-10-25 14:50:13 · 8 answers · asked by mle 2

What effect on the claorimeter constant alculated would be observed if the calorimeter cup were made of a conduction metal rather than plastic foam?

2006-10-25 14:40:47 · 1 answers · asked by vballchic3101 2

(Many drops of NaOH solution remained clinging to the inside of the buret) Specify

2006-10-25 14:40:19 · 1 answers · asked by hibiscus2424 1

I'm writing a report/ dialogue (I ask the chemist questions and he/she responds) and i dont know what chemist to do it on. Any ideas?

2006-10-25 14:01:27 · 9 answers · asked by AnonymousQuestionerAnswerer 3

an electron for which n=4 has more ______ than an electron for which n=2
a)spin
b)stability
c)energy
d)wave nature

2006-10-25 13:37:16 · 5 answers · asked by t-man foshizzle 2

i am testing how sucrose and yeast levels affect fermentation. i need to find an experiment to follw with clear directions.
plz help if you can.

2006-10-25 13:33:45 · 1 answers · asked by ? 1

^

2006-10-25 12:31:32 · 6 answers · asked by fansari31 2

2006-10-25 12:26:07 · 8 answers · asked by spidermansme 1

2006-10-25 12:13:04 · 6 answers · asked by Anonymous

I'm having a real hard time understanding the thermochemistry parts of my study guide, Your help is appreciated!

18) All of the following have a standard enthalpy of formation value of zero at 25 degrees C except:
a) CO(g)
b) Fe(s)
c) C(s)
d) F2(g)
e) Ne(g)

answer is A, but how am I supposed to know that?

19) The equation for the standard enthalpy of formation of sodium bromide corresponds to which reaction?
a) Na(g) + 1/2 Br2(g) -> NaBr(g)
b) Na(s) + 1/2 Br2(s) -> NaBr(g)
c) Na(g) + Br(g) -> NaBr(s)
d) Na(s) + 1/2 Br2(I) -> NaBr(s)
e) Na(s) + 1/2 Br2(s) -> NaBr(s)

The answer is D, again I have no idea what this means!

20) Given the following data:
S(s) + O2(g) -> SO2(g) deltaH = -395 kJ / mol
S(g) + O2(g) -> SO2(g) deltaH = -618 kJ / mol

find the heat required for the reaction converting solid sulfur to gaseous sulfur at 298K and 1 atm pressure
a) -1013
b) +618
c) -618
d) -223
e) +223

answer is e
:( we're not allowed to use notes or book

2006-10-25 12:12:16 · 4 answers · asked by SelArom 1

Hi,

For Ernest Rutherford's Gold Foil Experiment, WHY DID SOME ALPHA PARTICLES BOUNCED BACK FROM THE GOLD FOIL??

2006-10-25 12:03:11 · 6 answers · asked by Anonymous

2006-10-25 12:01:34 · 9 answers · asked by Anonymous

I found two different science sites that made this confusing. One said that the invention of the Particle Accelerator was in Cambridge, England. And the other site said it was invented in Cambridge, Massachusetts. Which one is correct?

2006-10-25 11:53:37 · 2 answers · asked by Anonymous

What is the molar mass of O2?

2006-10-25 11:44:43 · 5 answers · asked by Frank B 1

do you know?

2006-10-25 11:35:37 · 4 answers · asked by Anonymous

2006-10-25 11:11:01 · 6 answers · asked by chipper1963 1

2006-10-25 10:51:05 · 7 answers · asked by Anonymous

2006-10-25 10:39:43 · 3 answers · asked by urlast2003 1

2006-10-25 10:35:54 · 1 answers · asked by Kameliya 2

found in rhubbarb leaves and some herbs

2006-10-25 10:27:45 · 2 answers · asked by dennis l 1

2006-10-25 10:19:08 · 16 answers · asked by Anonymous

2006-10-25 10:10:16 · 2 answers · asked by Anonymous

Also, what is the mass of Neutrino?

2006-10-25 09:57:00 · 16 answers · asked by Anonymous

if you placed cabbage juice in lemon juice versus bleach?

2006-10-25 09:55:07 · 3 answers · asked by lil_flirt_57<3 2

Sodium carbonate is a reagent that may be used to standardize acids. In such a standardization it was found that a .498g sample of sodium carbonate required 23.5mL of a sulfuric acid soln to reach the end pt for the rxn.

Na2CO3(aq) + H2SO4(aq)------->H2O(l) + CO2(g) + Na2SO4(aq)

what is the molarity of the H2SO4?

thanks for anyone's help:)

2006-10-25 09:39:22 · 2 answers · asked by Anonymous

Suppose your lab instructor inadvertantly gave you a sample of KHP contaminated with NaCl to standardize your NaOH. How would this affect the molarity of your NaOH solution?

I was thinking that since NaOH + NaCl -------> NaCl + NaOH (??), then the molarity would not be affected...but this doesn't seem right...could anyone point me in the right direction? Thank you!!!

2006-10-25 09:34:53 · 2 answers · asked by Anonymous

2006-10-25 09:29:59 · 5 answers · asked by Violet 2

Please, give 3 major differences?

2006-10-25 09:29:19 · 20 answers · asked by Anonymous

98, 212, 100?

2006-10-25 09:17:23 · 11 answers · asked by Anonymous