Chemistry - May 2007

2007-05-13 06:54:53 · 1 answers · asked by love2nnelly 1

What is(are) the noble the noble gas(es) that has(have) the same electron configuration as each of the ions in the compound formed from Z=21 and Z=16?

2007-05-13 06:49:59 · 2 answers · asked by love2nnelly 1

2007-05-13 06:14:20 · 1 answers · asked by darius s 1

I am in ap chem and have the ap test on tuesday. In electrochem problems, standard cell potential is cathode-anode, right? So if they give you the problem with 2 half reactions both beng reduced, how do u know which one to flip and make the cathode?

and the problem on the 2003 ap test it gives the following info:
Br2 + 2e- --> 2Br- E=+1.065
BrO3 - + 6H+ ---> Br2 + 3H2O E=+1.52

so i thought E=cathode-anode=1.065-1.52, but the solution says 1.52-1.065. why is the second one the cathode?

2007-05-13 06:04:40 · 2 answers · asked by reeca 3

What is the lewis structure of a molecule in sulfur in the solid state of matter?

2007-05-13 05:31:39 · 1 answers · asked by Anonymous

2007-05-13 04:16:59 · 1 answers · asked by Anonymous

What is the molecular mass of a nonionic solute if 5.60 grams dissolved in 104 grams of water lower the freezing point to -0.603°C?

2007-05-13 03:31:43 · 2 answers · asked by San Fran Kid 2

How would you work out the concentration if you had 0.0025 moles and 25cm3 of solution and the answer is in moles per litre.

2007-05-13 03:30:48 · 7 answers · asked by Anonymous

Calculate the boiling point and freezing point of the follwoing solutions of molecular substances:

97.5 g of C12H22O11 (sucrose) in 185 g of water

2007-05-13 03:15:48 · 2 answers · asked by San Fran Kid 2

When could different liquids not be seperated using this technique, why?

Why is this a useful technique?

What is the technological application of this?

2007-05-13 02:50:34 · 1 answers · asked by bob 2

2007-05-13 02:19:18 · 1 answers · asked by Anonymous

Is it Substitution? But what actually happens? Whats the science behind it?

2007-05-13 01:39:18 · 2 answers · asked by Anonymous

1. For the reaction SO3+H20 produces H2SO4, calculate the percentage yield if 500. g. of sulfur trioxide react with excess water to produce 575g of sulfuric acid.

2. For the reaction 2Na+2H20 produces 2NaOH+H2, calculate the percentage yield if 80g of water react with excess sodium to produce 4.14g of hydrogen.


Please show your work so i can understand how to answer these questions. Thank U.

2007-05-13 01:29:13 · 1 answers · asked by lpkegirl 3

Methylpropan-2-ol is a tertiary alcohol and when shaken with Lucas reagent (ie:do the lucas test on it) a cloudy solution layer forms very quickly (cos its a tertiary alcohol) But why is it cloudy???
I know an alkyl halide has formed but why is it cloudy???
Please respond quickly! Jen

2007-05-13 01:23:18 · 3 answers · asked by Anonymous

with the aid of equation that lead oxide itself.

2007-05-13 01:10:20 · 1 answers · asked by Iliyasu I 1

2007-05-13 00:50:54 · 5 answers · asked by Anonymous

pls help me out with this.20cm3 ofa gaseous hydrocarbon were mixed with 90cm3 oxygen,and the mixture xploded.At room temp,60cm3 of gas were left.40cm3 of the gas CO2 were absorbed by sodiumhydroxide ,leaving 20cm3 of oxygen.Find the empirical formula of the hydrocarbon.

2007-05-13 00:49:51 · 1 answers · asked by Iliyasu I 1

What is the order of the following aromatic compounds in terms of the rate of bromination?
aniline- anisole- phenol- chlorobenzene- nitrobenzene

2007-05-13 00:41:56 · 1 answers · asked by arkanion 1

2007-05-12 22:27:29 · 2 answers · asked by xse 1

please answer this as soon as posible. i need it by tonight. Prove or derive the equation below.
Xw=(1+p)/(1-p)

2007-05-12 22:03:40 · 2 answers · asked by never_cry_for_nothing 2

a). nonpolar
b). ionic
c). polar
d). hydrogen bonded

2007-05-12 21:34:34 · 3 answers · asked by jokool915@sbcglobal.net 2

2007-05-12 21:22:26 · 3 answers · asked by Mari 2

The Guinness book of records holds a record for some person digesting steel nails. Thing is, the stomach has a pH of 1-2 and that definitely doesn't break down steel. So how low would his stomach acidity have to be to break down steel?

2007-05-12 20:28:15 · 4 answers · asked by liquidicy 3

2007-05-12 20:16:12 · 5 answers · asked by zee_muk 1

2007-05-12 20:11:54 · 2 answers · asked by Anonymous

H2O (l) --H2O ( g )
CaCO3 ( s ) -- CaO( s ) + CO2( g )
NH4 NO3 ( s ) + H2O( l )--- NH4 + ( aq ) + NO3- ( aq )

2007-05-12 20:03:15 · 2 answers · asked by Anonymous

besides something you chemically treated. ex alcohol, bleach.....

I'm expecting a lot of boiled water answers, but thats a given.

2007-05-12 20:00:53 · 3 answers · asked by Mercury 2010 7

48 KNO3+ _ C 12 H22O11 ? CO2+ _ N2+ _ K2CO3+ _ H2O
or
6 KNO3+ _ S + ? H2O _ H2SO4+ _ N2+ _ K2SO4
or
5 S + _ KNO3 + _ H2O _ H2 SO4 + ? N2 + _ K2SO4
or
5 C12H22O11 + ? KNO3 _ CO2 + _ N2 + _ K2CO3 + _ H2O

2007-05-12 19:40:40 · 1 answers · asked by Anthony L 1

CH3CH2OH
CH4
CH3CH3
CH3C(O)CH3
NOT ENOUGH INFO.

2007-05-12 19:20:12 · 1 answers · asked by divaem 1

was doubled, what happened to the temperature?

decreased by 1/3
temp became 1/2
temp doubled
temp increased 4x
not enough info?

2007-05-12 19:12:52 · 1 answers · asked by divaem 1