Chemistry - November 2007

I need help explaining on why oil and water do not mix. I know that oil is less dense than water, so it causes it to float on top, but else is involved? To take it a step further, what can you add to a solution of oil and water in order for them to mix? I was thinking or salt or sugar, but they didn't work >:( Can someone please help me, guaranteed 10 points for the most accurate and descriptive answer.

Thank you for all your help!!!!!!

2007-11-09 17:01:46 · 11 answers · asked by blcros97 2

2007-11-09 16:24:16 · 5 answers · asked by Anonymous

It's for a science experiment, it's the only way you can burn the pizza on a calorimeter [with matches], is if it doesn't contain any liquids


??help

2007-11-09 16:09:55 · 2 answers · asked by Anonymous

College algebra sucks!!!!!
Looking for the pH factor of a substance either acidic or basic.
Show how to find the hydrogen ion content of the substance using the formula. Is my assig'n

2007-11-09 16:08:08 · 2 answers · asked by harpercindy 1

2007-11-09 15:45:42 · 6 answers · asked by ♪£yricảl♪ 4

for the question 'Iron(III) chloride solution is added to potassium iodide solution and a redox reaction occurs.' how do you know what the two reacting species will be? i would have though that Cl would be included because its very highly oxidative but the Iodide is oxodised instead. why?

2007-11-09 15:39:15 · 2 answers · asked by bob 1

A. Low ionization energy and good electrical conductivity?

B. High ionization energy and poor electrical conductivity?

C. High ionization energy and good electrical conductivity?

D. Low ionization energy and poor electrical conductivity?

2007-11-09 14:46:58 · 5 answers · asked by Chris M 1

i always wonder when you leave a cold drink on a table, later you would see water on the side of it. does it come from inside of the water bottle or from the atmosphere?

2007-11-09 14:46:17 · 8 answers · asked by dorkyqueen 3

2007-11-09 14:41:24 · 6 answers · asked by connie w 2

1. urine normally has a pH of 6.0. If a patient eliminates 1800 mL of urine per day, how many moles of H+ were eliminated:
1. 1.8 x10^3 mol
2. 42 mol
3. 1.8x10^-6 mol
4. 1.8 x 10^-7 mol

2.what is the hydronium ion concentration is a solution having a pH of 0.050 at room temperature?
1. 3.00M
2. 0.951M
3. none of these
4. 2.00 x 10^-13 M
5. 0.891M

3. What is the pH of a solution labeled 0.00013M HNO3?

1. 10.00
2. 11.11
3. 4.11
4. 2.89
5. 3.89

4. What is the pH of an acid solution obtained by mixing 200mL of 0.0155M H2SO4 and 300mL of an 0.210M HCI solution? assume all of the acids dissociate.

1. 1.2
2. 0.460
3. 1.9
4. 0.523
5. 1.16
6. 2.2
7. 0.859

2007-11-09 14:02:29 · 2 answers · asked by Anonymous

"...50.0 to 500.mL 0.0375% w/w H2O2 solution over three hours..." i don't understand the language of chemistry!!!

2007-11-09 13:54:34 · 1 answers · asked by Anonymous

2007-11-09 13:49:17 · 7 answers · asked by Anonymous

I got the answer to the tension part of the question. Tension = 4.78e-3 N. Now, what is the charge on each ball?

Two identical, small insulating balls are suspended by separate 0.37-m threads that are attached to a common point on the ceiling. Each ball has a mass of 4.4 x 10-4 kg. Initially the balls are uncharged and hang straight down. They are then given identical positive charges and, as a result, spread apart with an angle of 51o between the threads. Determine (a) the charge on each ball and (b) the tension in the threads.

2007-11-09 13:46:00 · 0 answers · asked by krystal_michele 1

When 50mL of aqeous HCl was mixed with 50mL of NaOH (in excess), the temperature of the solution increased from 25C to 32.41C. The reaction is...
NaOH(aq) + HCl(aq) --> NaCl(aq) + H2O(aq).
change in heat= -57.3kJ
What is the molarity of the original HCl solution?
Assume the heat capacity of the solution is the same as pure water (4.184J/g*C), the density of the solution is 1g/mL, and there is no loss of heat to the surroundings

2007-11-09 13:45:34 · 1 answers · asked by triphip2 4

like in this ex:
what is the magnetism and # of unpaired electrons of B2?
what i got from the solution is it is paramagnetic and 3 but i dont know how

2007-11-09 13:32:26 · 1 answers · asked by sdt3 1

(a) Potassium metal burns in an atmosphere of chlorine gas.
(b) Strontium oxide is added to water.
(c) A fresh surface of lithium metal is exposed to oxygen gas.
(d) Sodium metal is reacted with molten sulfur.

2007-11-09 13:01:29 · 1 answers · asked by Circuiteer 1

(Type your answer using the format [Ar] 4s2 3d10 4p2 for [Ar]4s23d104p2.)

2007-11-09 12:58:32 · 2 answers · asked by Circuiteer 1

photography business because it has the ability to dissolve reactant unreacted silver salts from photographic film during development.
S8(s) + Na2So3(aq) + H2O(l)  Na2S2O3*5H2O(s) what is the theorectical yields of sodium thiosulfate pentahydrate when 3.25 g of sulfur is boiled with 13.1 g of sodium sulfite? What is the percent yield of the synthesis if a expirament is able to isolate only 5.26 g of the product.

2007-11-09 12:20:42 · 1 answers · asked by Anonymous

please put your source [ex. www.sceince.com/Chlorine]

2007-11-09 11:15:30 · 1 answers · asked by Michelle P 1

Please put atleast 3 important uses.

2007-11-09 10:55:08 · 4 answers · asked by sph95 2

What is the final temperature of a system of iron and water if a piece of iron with a mass of 25g at a temperature of 75C is dropped into an ainsulated sontainer of water at 35.6C? The mass of the water is 150g. The specific heat of iron is 0.449J/g.C, and the specific heat of water is 4.184 J/g.C.

2007-11-09 10:31:06 · 2 answers · asked by STAT1 3

How does the concentration gradient affect the rate at which gas dissolves in a liquid?

2007-11-09 10:28:43 · 1 answers · asked by guesshustler 1

At 0°C a 1.00 L flask contains 8.40 10-2 mol N2, 5.40 102 mg O2, and NO at a concentration of 9.00 1018 molecules/cm3. What is the partial pressure of each gas, and what is the total pressure in the flask?
PN2 = ____ atm
PO2 = ___ atm
PNO = ___ atm
Ptotal = ____ atm

2007-11-09 10:28:24 · 1 answers · asked by poo 2

A sample of nitrogen gas was collected over water at 20.°C and a total pressure of 1.40 atm. A total volume of 2.35 102 mL was collected. What mass of nitrogen was collected? (At 20.°C the vapor pressure of water is 17.5 torr.)

2007-11-09 10:27:34 · 1 answers · asked by poo 2

The total pressure of a 200mL sample of oxygen collected over water at 25Celsius is 1.030 atm.
A) How many moles of gas is present?
B) How many moles of oxygen is present?
C) How many moles of water vapor is present?

2007-11-09 10:18:58 · 1 answers · asked by Anonymous

Using tabulated standard reduction potentials from your text, calculate the standard cell potential, E°cell (always positive for a galvanic cell), based on the following (unbalanced) reaction:

IO3^- (aq) + Fe^2+(aq) <--> Fe^3+(aq) + I2(s)


Can someone please help me with this because I've been retrying it for soo long and I just can't get the right answer. Please anyone help me. Thanks soo much.

2007-11-09 09:56:00 · 1 answers · asked by Anonymous

An unknown compound contains only carbon, hydrogen, and oxygen. Combustion analysis of the compound gives mass percents of 31.57% C and 5.30% H. The molar mass is determined by measuring the freezing point depression of an aqueous solution. A freezing point of -5.20°C is recorded for a solution made by dissolving 10.56 g of the compound in 25.0 g water. Determine the empirical formula, molar mass, and molecular formula of the compound. Assume that the compound is a nonelectrolyte.

2007-11-09 09:02:56 · 2 answers · asked by softball_linz_06 1

produced when 25.0 mL of 2.0M HNO3 is diluted to 750mL. Show work.

2007-11-09 09:00:07 · 2 answers · asked by moonlit skies 2

2007-11-09 08:55:03 · 6 answers · asked by NICOLE B 1

What is rust and what makes it appear?

2007-11-09 08:42:54 · 24 answers · asked by chris u 1