Chemistry - June 2007

Eating or taking mushrooms does not hurt you mentally or physically? How is that even possible when the effect of the drug messes with your brain. I don't get it! HELP!!!

2007-06-02 18:12:22 · 3 answers · asked by Anne Marie P 1

What can sulfur oxides cause in the atmosphere?(Including advantages and disadvantages) Maybe it is related to acid rain, greenhouse effect and photochemical gases.

2007-06-02 16:11:34 · 3 answers · asked by yi 1

1) A buffer is prepared by mixing 669 mL of 0.50 M formic acid, HCHO2, and 331 mL of 0.50 M sodium formate, NaCHO2. Calculate the pH.
What would be the pH of 85 mL of the buffer to which 8.5 mL of 0.16 M hydrochloric acid has been added?

2) A 0.300 g sample of propionic acid was dissolved in water to give 50.0 mL of solution. This solution was titrated with 0.350 M NaOH. What was the pH of the solution when the equivalence point was reached?

i do not understand these questions at all. please help if you can. thanks in advance!

2007-06-02 15:43:52 · 3 answers · asked by Anonymous

as indicated by a little "D" subscript when giving polarimeter rotation angles for enantiomers?

2007-06-02 15:29:09 · 4 answers · asked by Anonymous

How many liters of CO2 are produced when 400. g CaCO3 reacts with HCl in the following reaction at STP? CaCO3 + 2 HCl ® CaCl2 + CO2 + H2O

2007-06-02 13:27:50 · 2 answers · asked by Vic 1

in detail please. what chemicals are used and how

2007-06-02 12:15:52 · 2 answers · asked by just want answers 1

What mass of NaOH is produced when 0.25 g of Na reacts with excess H2O in the following reaction? 2 Na + 2 H2O ® 2 NaOH + H2

2007-06-02 12:11:24 · 3 answers · asked by Maddie L 1

What mass of solid potassium oxalate (K2C2O4), when dissolved in an acidic solution, would be titrated by exactly 25.0 mL of 0.0177 M potassium permanganate (KMnO4) solution?
(Mn2+ ions and carbon dioxide are produced in the reaction.)


Please show your work and have answer to the correct number of sig. figs. Thanks a lot! =)

2007-06-02 11:54:16 · 1 answers · asked by Anonymous

find the molarity W/V% concentration and the concentration in ppm of cl-

2007-06-02 11:50:39 · 3 answers · asked by Anonymous

At one atmosphere of pressure helium can not be cooled to form a solid. Helium has the lowest boiling temperature of any substance. At what temperature (@1 atm) would helium be a liquid so that you could fill the Buck Rogers of the 25th Century Ray Gun?

_____ degrees Kelvin
_____ degrees Celcius

2007-06-02 11:16:46 · 3 answers · asked by xocharliexo121 2

1. Hydrochloric acid (HCl) is an acid found in gastric juice (stomach fluid).
a. Write an equation for the formation of ions when this acid dissolves in water.
b. Name each ion.

Thanks in advanced!

2007-06-02 11:09:11 · 3 answers · asked by Anonymous

such as wether or not the water the water is drinkable

2007-06-02 10:48:13 · 3 answers · asked by just want answers 1

I know this is a hard question that depends on different types of chocolate. ANY sort of chocolate (ex: Lindt 70% cocoa) would be helpful. I need a formula though. I've googled, so if you don't know the answer, please don't link me to a website that doesn't really have the information I'm seeking.

2007-06-02 10:47:42 · 3 answers · asked by Flit 1

which do you believe is worse for your body/mind and why?

2007-06-02 10:17:29 · 2 answers · asked by Mercury 2010 7

I need to be able to fill a large balloon with it....does anyone know how I can do that, without fancy chemicals or equipment?

2007-06-02 10:15:54 · 6 answers · asked by Anonymous

A student mixes these volumes of 0.020 M H2SO4, 0,030 M KI and water. Calculate the concentrations of H2SO4 and KI in each solution assuming that all drops are equal in volume, say, 1 mL.

For experiment one, 5 drops of H2SO4 are mixed w/ 7 drops KI and 48 drops of H2O.

For experiment two, 5 drops of H2SO4 are mixed with 10 drops of KI and 45 drops of water.

How do I go about solving this? Please help. Thanks.

2007-06-02 10:14:42 · 2 answers · asked by Anonymous

1 General structure for halocarbons compounds?
2 Reaction of bezene and chlorine(structural formula)
3 Balanced equation of 2-pentene and water
4 General structurefor aldehyde compounds
6 General structure for carboxylic acid compounds
7 Generalstructure for ester compounds
10 What happens in a substitution reaction. Example of a substitution reaction and name atoms involved in the replacement.
12 Example of addition reaction and describe what happens
16 Describe a polymerization condensation reaction. Example.

2007-06-02 10:14:12 · 1 answers · asked by Jooanee 1

If 18 ml of oxygen are collected over water at 27 degrees C and 740 mm of pressure, what volume will the dry gas have at STP?

Use the following information: vapor pressure of water at 27 degrees C has a pressure of 26.7 mm Hg

2007-06-02 10:04:34 · 2 answers · asked by 1234567890 5

can you please write down the chemical reaction.
(answer before 9 p.m.on 3rd may2007 please)

2007-06-02 09:58:23 · 3 answers · asked by SWETA 2

if so then what is being oxidised and what is being reduced?
(answer before 9 p.m.on 3rd may2007 please)

2007-06-02 09:54:57 · 2 answers · asked by SWETA 2

2007-06-02 09:29:49 · 1 answers · asked by Tina B 1

A student mixed volumes of .020 M H2SO4, .030 M KI, and water. Calculate the concentrations of H2SO4 and KI in each solution assuming that all drops are equal in volume, (say, 1mL)

In experiment 1: 5 drops H2SO4, 7 drops KI, and 48 drops of H20.

In Experiment 2: 5 drops H2SO4, 10 drops KI, 45 drops H2O

Any tricks to solving this? How does one approach this? Thanks in advance!

2007-06-02 09:26:32 · 1 answers · asked by Anonymous

Question : A certain gas is collected over water at 740 mm at 23 degrees C. The collecting tube is left in place, and
Question Details: A certain gas is collected over water at 740 mm at 23 degrees C. The collecting tube is left in place, and the volume is not measure until the next day when the pressure is 745 mm and the temperature is 20.0 degrees C, at which time the volume is found to be 15.3 ml. What is the original volume?
(The first correct answer to this question, WITH DETAILS THAT I FIND SUFFICIENT TO SORVE THIS PROBLEM OR CORRECTLY WORKED OUT SHALL RECEIVE BEST ANSWER)

Use the following information in solving this problem: Temperature in degrees C (listed first) Pressure in mm Hg(listed second)
1 4.9
2 5.3
3 5.7
4 6.1
5 6.5
6 7.0
7 7.5
8 8.0
9 8.6
10 9.2
11 9.8
12 10.5
13 11.2
14 12.0
15 12.8
16 13.6
17 14.5
18 15.5
19 16.5
20 17.5
21 18.6
22 19.8
23 21.1
24 22.4
25 23.8
26 25.2
27 26.7
28 28.3
29 30.0
30 31.8
31 33.7
32 35.7
33 27.7

2007-06-02 09:21:15 · 1 answers · asked by 1234567890 5

2007-06-02 09:16:03 · 6 answers · asked by mandie 1

2007-06-02 08:57:10 · 6 answers · asked by Anonymous

can anyone tell me what compound/s should be added to a polymer in order for it to react with certain bacterias and thus making it biodegradable.....!?!? (nosebleed)

2007-06-02 08:32:01 · 1 answers · asked by reccapipz 1

In the decomposition reaction of gallium chlorate, 75 grams is heated to produce oxygen and gallium chloride.

Calculate the following:
A.) Write the balanced equation for the reaction and find the mole ratios of the reactants and products required to solve any stoichiometric problem.
B.) Find the mass in gram of gallium chloride formed in the reaction.
C.) Find the volume of oxygen in liters formed at 25 Celsius if the gas is collected over mercury under an atmospheric pressure of 670 torr.
D.) How many liters of 2.50 M AgNO3, would be required to titrate all the gallium chloride chloride formed

2007-06-02 08:31:05 · 2 answers · asked by Reed 1

carbon dioxide gas does not burn. for this reason,it is effective in putting out fires. which additional fact(s) would enable you to conclude that a fire extinguisher containing carbon dioxide is an excellent household safety device?

A. water can cause on oil fire to spread and can increase the toxic fumes of an electrical fire
B. carbon dioxide gas dissolves in water,forming a small amount of carbonic acid,which is useful as a preservative.
C. carbon dioxide gas is not harmful to humans
D. pressurized carbon dioxide cools when it flows through the opening of its container and will quickly reduce the temperature of anything it touches.

1 .A and C
2. B and D
3. C and D
4. A,B, and C
5. A,C,and D

2007-06-02 08:10:43 · 4 answers · asked by janely 1

Aluminum metal melts at 660 Celsius and boils at 2450 Celsius. Its density is 2.70 grams/cc.

Calculate the following:
A.) Assuming an ideal gas, the volume occupied by 20 kilograms of aluminum vapor at its boiling points and under pressure of 2280 torr.
B.) The volume occupied by 1000 kilograms of the metal at 25 Celsius.
C.) If the specific heat capacity of aluminum metal is 0.89 Joules per gram-degree C, how many calories of energy are required to heat 10 kilomoles of aluminum from 250 Celsius to 500 Celsius.
D.) If 13.5 grams of aluminum were dissolved in an excess of concentrated HCL, what volume of hydrogen gas would be released at STP? You may assume that the ideal gas law holds and that the vapor pressure of water of water is negligible compared to the pressure of the released hydrogen.

2007-06-02 08:10:26 · 1 answers · asked by Reed 1

and also what is the observed results when concentrated HCl is added to a saturated NaCl solution someone explain these two questions in terms of Le Chatelier's principle please.

2007-06-02 08:09:18 · 1 answers · asked by gala 1