Chemistry - October 2007

answer in a non-scientist way

2007-10-25 15:58:06 · 7 answers · asked by Anonymous

I need instutions on how to isolate the acid without getting hurt.

2007-10-25 15:27:42 · 3 answers · asked by Anonymous

What will be the final temperature of the water in an insulated container as the result of passing 4.76 g of steam [H2O(g)] at 100.0°C into 110.5 g of water at 25.0°C? (Hvap° = 40.6 kJ/mol H2O)

2007-10-25 15:25:31 · 2 answers · asked by Anonymous

A balloon filled with 31.9 mol helium has a volume of 715. L at 0.0°C and 1.00 atm pressure. The temperature of the balloon is increased to 68.0°C as it expands to a volume of 893. L, the pressure remaining constant. Calculate q, w, and E for the helium in the balloon. (The molar heat capacity for helium gas is 20.8 J/°C·mol.)

2007-10-25 15:23:33 · 1 answers · asked by toocool 1

A 1.397 g sample of thymol, C10H14O(s) (a preservative and a mold and mildew preventative), is burned in a bomb calorimeter assembly. The temperature increase is 11.23°C, and the heat capacity of the bomb calorimeter is 4.68 kJ/°C. What is the heat of combustion of thymol, expressed in kilojoules per mole of C10H14O?

2007-10-25 15:22:07 · 1 answers · asked by toocool 1

Salicylic acid, C7H6O3, has been suggested as a calorimetric standard. Its heat of combustion is -3.023 103 kJ/mol C7H6O3. From the following data determine the heat capacity of a bomb calorimeter assembly (that is, the bomb, water, stirrer, thermometer, wires, and so forth).


mass of salicylic acid burned: 1.111 g
initial calorimeter temperature: 23.07°C
final calorimeter temperature: 29.55°C

2007-10-25 15:21:41 · 2 answers · asked by toocool 1

In a coffee-cup calorimeter, 1.20 g of NH4NO3 is mixed with 76.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.21°C. Assuming the solution has a heat capacity of 4.18 J/°C·g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.

2007-10-25 15:21:17 · 1 answers · asked by toocool 1

a) HBr : polar

b) CF4 : polar

c) CH3CH2CH3 : nonpolar

d) CH3CH3 : nonpolar

2007-10-25 15:01:23 · 1 answers · asked by Anonymous

The nutritional calorie (Calorie) is equivalent to 1 kcal. One pound of body fat is equivalent to about 4.1 103 Calories. If an athlete expends 1475 kJ/h, how long does she have to play to work off 1.0 lb of body fat?

2007-10-25 14:56:42 · 2 answers · asked by Anonymous

where founded and who found?
what is tin used for?
what are the properties of tin?

2007-10-25 14:42:41 · 4 answers · asked by Amy 2

i have a science project due pretty soon and i need a good slogan for the element NEON (Ne) please help me out

2007-10-25 14:20:07 · 4 answers · asked by Anonymous

ive tried and i cannit find an easy way to know it..... i mean lyk i tried readin da buk but its jus not doin me gud....is der a gud way 2 memba it???

2007-10-25 14:06:56 · 9 answers · asked by Anonymous

2007-10-25 14:05:52 · 3 answers · asked by winky 2

can you neam three factors that affect the internal friction of a fluid?

2007-10-25 13:55:34 · 1 answers · asked by Joanne M 1

Can someone explain why glass is considered a cold liquid state? Seems just too weird. I just saw it in discovery channel but they did not explain why it is so.
thxs

2007-10-25 13:10:25 · 3 answers · asked by GreenEyes 7

a)How many grams of calcium carbonate would be needed to react completely with 15.0 grams of the acid?
b) How many grams of carbon dioxide would be produced in this reaction?
c) How many grams of calcium chloride would be formed at the same time?

Formula: CaCO3 + 2HCl ----> CO2 +H2O + CaCl2

Im completely lostt and i hate stoichiometry! It seems so hard, so if you can help me, thank you very much! Include steps please!

2007-10-25 12:10:40 · 2 answers · asked by lalala 1

2007-10-25 11:38:45 · 2 answers · asked by Anonymous

2007-10-25 11:30:45 · 0 answers · asked by Anonymous

2007-10-25 11:29:08 · 2 answers · asked by Anonymous

2007-10-25 11:10:46 · 3 answers · asked by Alan G 1

Potassium salts are much more expensive than ammonium salts. Ammonium aluminum alum can often be used interchangeably with potassium aluminum alum. What is the maximum weight of ammonium aluminum alum that can be made from 2.20g of aluminum?

2007-10-25 10:56:05 · 2 answers · asked by Anonymous

1. 2-dimethylpentane
2. 1,3-dimethylpropane
3. 3-methylbutane
4. 3,4-dimethylbutane

2007-10-25 10:55:19 · 3 answers · asked by sillyboys_trucksare4girls 2

2007-10-25 10:54:11 · 1 answers · asked by ahnickzai 1

Please don't come up with some lame-o answers.. I really need to know.
If *possible* please give me the link to where you got your answer. thanks a lot!

2007-10-25 10:48:13 · 3 answers · asked by Nichole 3

1. potassium sulfate 4.aluminunm oxygen
2. calcium oxygen
3.sodium oxygen

2007-10-25 10:39:43 · 2 answers · asked by ♥♡❤Abrazos y besitos♥♡❤ 5

One mole of nitrogen gas confined within a cylinder by a piston is heated from 0°C to 883°C at 1.00 atm.
(a) Calculate the work of expansion of the gas in joules (1 J = 9.87 10-3 atm·L). Assume all the energy is used to do work.
(b) What would be the temperature change if the gas were heated with the same amount of energy in a container of fixed volume? (Assume the specific heat capacity of N2 is 1.00 J/g·K.)

2007-10-25 10:27:03 · 2 answers · asked by jake1414 1

A solution that is 95% ethanol is 190 proof. What is the molarity of ethanol in a vermouth drink, if the vermouth is 36 proof? The density of ethanol is 0.78 g/mL

For 36 proof I figured its 18%. I got an answer of 3.05 M of ethanol, but I'm not sure.

2007-10-25 10:08:48 · 1 answers · asked by plumlove 1

(a.) Valence Electrons (b.) Neutrons

2007-10-25 10:04:01 · 3 answers · asked by Anonymous

for my chemistry class i need to make a model of a double displacement reaction but i dont even know what one looks like or how to make it! can somebody find a good website with examples and pictures????please

2007-10-25 09:33:16 · 2 answers · asked by jennifer s 1

-----> please n() mean answers =(

2007-10-25 09:05:38 · 2 answers · asked by Anonymous