Chemistry - March 2007

...in the presence of sunlight to form ground-level ozone? Please :)

2007-03-13 08:05:34 · 1 answers · asked by yeraciba 2

2007-03-13 08:04:33 · 7 answers · asked by Anonymous

What volume (mL) of 0.386 M potassium hydroxide solution would just neutralize 64.9 ml of 0.379 M H2SO4 solution?

2007-03-13 08:02:54 · 3 answers · asked by Gemini 2

2007-03-13 08:01:09 · 2 answers · asked by punkun 2

Use the following information to calculate Delta Hlattice for MgF2.

Mg(s) --> Mg(g)
Delta H = 148 kJ

F2(g) -> 2F(g)
Delta H= 159 kJ

Mg(g) -> Mg+(g)+e-
Delta H = 738 kJ

Mg+(g) -> Mg2+(g)+e-
Delta H = 1450 kJ

F(g)+e- -> F-(g)
Delta H = -328 kJ

Mg(s)+ F2(g) --> MgF2(s)
Delta Hf = -1123 kJ

2007-03-13 07:53:49 · 1 answers · asked by socr8711 2

anyone knows?
the answer given is [H+] = 0.00712M
but i really cant get the correct way to get the answer, any superior can guide me? thanks you very much

2007-03-13 07:51:45 · 1 answers · asked by Jack 1

Help!
A typical car gets 30 mi. per gallon of gas and drives 12,000 mi every yr. Assuming that octane (C8H18 0.7025 g/cm3) is a principal componnent of gasoline.
a. how much oxygen is required for a car to run for 1 yr?
b. how much CO2 (in grams) is produced by the car in 1 yr?
C. how many trees are required to remove the CO2 produced by the car in 1 year???

HELP!!!!!!!

2007-03-13 07:51:17 · 2 answers · asked by Anonymous

Which of the following are true statements for the given compound in aqueous solution ?



a) NH3 : A Bronsted base and a Lewis base

b) HI : A Bronsted acid, but not a Lewis acid

c) CH3CH2CH2COOH : A Bronsted acid and a Lewis acid

d) Cu 2+(aq) : A Bronsted acid, but not a Lewis acid

e) CH3CH2CH2CH3 : Both a Bronsted acid and a Lewis acid


I Tried:
1) A,B,C
2) A,B

2007-03-13 07:48:08 · 3 answers · asked by Russell M 1

2007-03-13 07:25:12 · 3 answers · asked by mirriahkillian 1

I need to make 0.2, 0.4, 0.6, 0.8 & 1.0 M of NaOH from powder. I need to find out how to make them & how you got to the answer i.e. using the n=cv equation or any other eqautions. It would be very helpfull if you could get back to me asap as I need this pretty urgently. Thank you

2007-03-13 07:18:42 · 4 answers · asked by J 1

that is role played by citric acid in Ni-DMG complex extraction

2007-03-13 07:18:11 · 2 answers · asked by dimple d. 1

What volume (mL) of 0.262 M potassium hydroxide solution would just neutralize 67.7 ml of 0.169 M H2SO4 solution?

2007-03-13 07:13:20 · 2 answers · asked by woj87marta 1

For H3PO4, a tripotic acid, Ka1 = 7.1 x 10–3, Ka2 = 6.3 x 10–8, and Ka3 = 4.5 x 10–13. What is the pH of a solution which contains 0.300 moles of Na2HPO4 and 0.400 moles of KH2PO4 per liter of solution?

2007-03-13 07:10:22 · 2 answers · asked by Ryan C 1

why is methyl orange toxic? - iam doing my chem cw and need to do a risk assesment for methly orange - help!!!

2007-03-13 07:04:14 · 4 answers · asked by emily 1

2007-03-13 06:58:36 · 3 answers · asked by Carolina Z 1

any other option to change iron into gold

2007-03-13 06:48:35 · 13 answers · asked by naresh3005 1

NaCl + KNO3

NH4OH + H2SO4

CuSO4 + Zn(NO3)2

CuSO4 + NH4Cl

FeCl3 + NH4OH

And how can I pre-determine if there is goin to be a reaction in the first place?

2007-03-13 06:36:42 · 3 answers · asked by leyzeebum 1

What is the main chemical ingredient in Corn Starch?

2007-03-13 06:28:43 · 2 answers · asked by Anonymous

2007-03-13 06:27:13 · 2 answers · asked by helena c 1

What happens to the ph of foods as they're cooked? Is the ph of tomatoes higher or lower after cooking? Cucumbers? potatoes?...

A technical explanation why or reference would be appreciated, I've got the chemistry background for it, it's just been too many years ;-)

2007-03-13 06:24:54 · 2 answers · asked by Anonymous

2007-03-13 06:24:07 · 3 answers · asked by woj87marta 1

a) CuCl2

b) CH3OH

c) CH3CH2OH

d) Hg

e) CH3CN

how can i solve this.
plz help me

2007-03-13 06:15:56 · 7 answers · asked by kcc 1

what happens when the sample beam blocked? when ref beam is blocked? If the sample or reference cuvet is dirty? what if we get negative absorption? can someone please help

2007-03-13 06:15:01 · 2 answers · asked by Angel 2

a) SO2(l) has a higher boiling point than H2O(l)

b) For the boiling points of hydrogen compounds of Group 16
H2Te > H2Se > H2S > H2O

c) For the boiling points of hydrogen compounds of Group 17
HF > HI > HBr > HCl

d) For the boiling points of hydrogen compounds of Group 14
CH4 > SnH4 > GeH4 > SiH4

Note: there may be more than one answser.

I thought that the more electrons u had, the higher the boiling point is. So i tried a and it was wrong. then i tried ab and it was wrong.
plz help me asap

2007-03-13 06:14:22 · 2 answers · asked by kcc 1

What mass of sugar would be contained per 1000g of water in this solution?

2007-03-13 06:03:17 · 2 answers · asked by M M 2

a) SiBrCl3 b) SO4-2 c) GaH3 d) I2

note: there may be more than one answer
plz help asap

2007-03-13 05:43:41 · 2 answers · asked by kcc 1

I need to know the chemical structure of hair because I think if there are some proteins we can polymerized that.

2007-03-13 05:26:09 · 3 answers · asked by chemist 1

2007-03-13 05:07:32 · 1 answers · asked by Anonymous

ca(oh)2 +2hcl > cacl2+2h2o

2007-03-13 04:59:34 · 3 answers · asked by jolee 1

using this reaction.. ch4+2o2 --> co2+2h2o

2007-03-13 04:56:38 · 4 answers · asked by jolee 1