Chemistry - April 2007

pressure:750mm HG
Volumen:275ml
weight of sample 0.920g
temperature: 100c
(use the general gas law formula and constant.)

2007-04-23 18:36:04 · 3 answers · asked by randy_nephro 1

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



a) NH3 : A Bronsted base, but not a Lewis base

b) OH - : A Bronsted base and a Lewis base

c) CH3COOH : A Lewis acid, but not a Bronsted acid

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

e) C6H6 : Both a Bronsted acid and a Lewis acid

2007-04-23 18:02:51 · 1 answers · asked by matthew204342000 1

Given that the molar mass of Vinegar is 60.0g and that the density of the vinegar solution is 1.01 g/ml, calculate the percent weight of the acid in the sample.

2007-04-23 17:57:37 · 2 answers · asked by vanillahighsky 2

a) For binary acids HA in the same row of the periodic table, the greater the electronegativity of A
the weaker the acid HA

b) For binary acids HA in the same column of the periodic table, the weaker the H-A bond
the stronger the acid HA

c) HBr is a stronger acid than HCl

d) H2SO3 is a weaker acid than H2SO4

e) HClO is a stronger acid than HBrO

f) For carboxylic acids : the greater the electronegativities of the atoms in the group bonded to the carboxyl group,
the stronger the acid

2007-04-23 17:57:36 · 1 answers · asked by auriclistens 1

We are currently using the Chemistry Organic textbook by Solomon and I have a hard time trying to study Organic... Any suggestions or if there are any sites with good notes on the material that maybe explain the processes better... ??

2007-04-23 17:41:48 · 6 answers · asked by BluEyes 2

i dont really want to rust metal myself, but i need rusted metal for an experiment. is there any way i can get small pieces of rusted metal for free.

2007-04-23 17:22:53 · 6 answers · asked by daniels2ndemail 1

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



a) NH3 : A Bronsted base, but not a Lewis base

b) OH - : A Bronsted base and a Lewis base

c) CH3COOH : A Lewis acid, but not a Bronsted acid

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

e) C6H6 : Both a Bronsted acid and a Lewis acid

2007-04-23 17:22:11 · 1 answers · asked by matthew204342000 1

to the equivalence point using 0.125 M NaOH. How many milliliters of NaOH will be required to neutralize the acid solution? A.) 61.4 mL B.) 86.0 mL C.)112 mL D.) 123 mL

2007-04-23 17:22:03 · 1 answers · asked by Anonymous

Consider the autoionization of water:
H2O(l) > H+(aq) + OH-(aq)
determine H° and S° for the autoionization of water.
T(C) K
0.0 1.14*10^-15
25 1.00*10^-14
35 2.09*10^-14
40 2.92*10^-14
50 5.47*10^-14

Estimate the value of G° for the autoionization of water at its critical temperature of 374°C

2007-04-23 17:13:01 · 1 answers · asked by smile 1

I have to categorize the types of reactions based on what I saw when I combined acids and bases. How can I use the information from the reaction (such as color change or gas release) to see what kind of reaction it is? And what are the different kinds of reactions? (I think neutralization is one of them)

2007-04-23 17:07:06 · 1 answers · asked by 1two3 1

is the coefficient of linear expansion (alpha) constant for all temperature ranges? why or why not?

is the expansion of a metal a reversible process?

2007-04-23 17:04:29 · 1 answers · asked by einnelnnyl 2

How many neutrons are in each neutral potassium-40 atom?
Mass # of lead-206?
# of protons of lead-206?
# of neutrons of lead-206
# of electrons of lead-206?

How much of an 89.6-mg sample Polonium-218 would remain after 9.15 minutes?
How many half-lives have passed for Polonium-218 after 9.15 minutes?

How many half lives have passed for Bi-210 after 10.02 days?
How much of a 64.0-mg sample Bi-210 would remain after 10.02 days?

Thank-you

2007-04-23 17:03:32 · 2 answers · asked by Amber H 1

Describe what the common name for the calcium carbonate (CaCO3) is called and what type of chemical reaction this is in words and in a chemistry format. Thanks.

2007-04-23 16:54:39 · 2 answers · asked by Anonymous

A.) pH = 7.5 B.) [H3O+] = 5.0 x 10^-5 C.) [OH-] = 2.0 x 10^-8
D.) more than one correct response
E.) no correct response

2007-04-23 16:46:10 · 5 answers · asked by jonblaz222 1

to have a pH of approximately A.) 6.3 B.) 7.3 C.)8.3 D.)9.3

2007-04-23 16:37:15 · 1 answers · asked by jonblaz222 1

help

2007-04-23 16:37:02 · 1 answers · asked by Sandy 2

chemical engineers use Le Chatelier's Principle to predict shits in chemical systems at equilibrium resluting from changes in the reaction conditions. for each reaction, state 2 changes that will maximize the yield of product.
a. Production of ethene:
C2H6 + energy <------> C2H4 + H2

b. Production of methanol:
CO + 2H2 <---> CH3OH + heat

2007-04-23 16:24:13 · 1 answers · asked by angelica i 1

suppose a reaction vessel contained these three gases at the following concentrations: [PCl3]= 0.0520 mol/L, [Cl2]=0.0140 mol/L , [PCl5] = 0.00600 mol/L
a. is the system in a state of equilibrium?
b. if not, in which direction will the reaction have to proceed to reach equilibrium?

2007-04-23 16:18:10 · 1 answers · asked by ali_e_royaha 1

How to convert 42 kcal/mol to kJ/mol.

How to convert 32 cal/(deg * mol) to kJ/(mol*K).

Please try and shows the steps if possible. Thanks in advance.

2007-04-23 16:17:55 · 1 answers · asked by Anonymous

2007-04-23 16:17:36 · 2 answers · asked by sasuke 1

something that go whit hydrogen and about it but it as to be a slogan

2007-04-23 16:12:52 · 1 answers · asked by Tmanda H 1

Classify the types of intermolecular forces present among molecules of each of these substances...Dipole to dipole, london disperson forces, hydrogen bonding....help!
Butane, C4H10(g), (lighters)
Ethanol, C2H5OH(l), (alcoholic drinks)
Dichloromethane, CH2Cl2(l), (solvent in correction fluid)

2007-04-23 16:10:50 · 1 answers · asked by no name 1

PLEASE help and tell me how it is done by tonight. >_<

2007-04-23 16:07:51 · 1 answers · asked by veryconfused 2

2007-04-23 16:05:03 · 1 answers · asked by Anonymous

Can someone fill the rest in?
H3C6H5O7 + Ca(OH)2 --> H2O + _____
NaOH + H2C2O4 --> H2O + ___________

2007-04-23 15:57:50 · 1 answers · asked by Thoreau 1

A solution is made by dissolving 12.50 g of NaOH, a strong base, in water to produce 2.0 liters of solution. What is the pH of this solution?

2007-04-23 15:26:34 · 1 answers · asked by Eric T 1

2007-04-23 15:19:04 · 1 answers · asked by Anonymous

Can someone please explain the difference between the conductivity of 6 M and 0.1 M HCL?

2007-04-23 15:18:21 · 1 answers · asked by Adria 2

1. C2H4(g) + H2(g) --> C2H6(g)
2. SO3(g) + CaO(s) --> CaSO4(s)
3. FeO(s) + H2(g) --> Fe(s) + H2O(g)
4. CdO(s) + 2HCl(g) --> CdCl2(s) + H2O(l)

2007-04-23 15:17:20 · 1 answers · asked by Anonymous

this is fairly simple for some odd reason i am getting two different answers. if you could please work this out and let me know what you get

N2(s) + 3H2(g) -----> 2NH3(g)

N2 Delta H = 0 Delta S = 191.5
H2 Delta H = 0 Delta S = 130.6
2NH3 Delta H = -45.9 Delta S = 193

if you could please find Delta S and Delta H and Delta G for this equation that would be great although if you don't feel like doing all of it, it seems my deviation is in Delta S ... Thanks for any help!!

2007-04-23 15:05:48 · 1 answers · asked by burgler09 5