Chemistry - February 2007

If oxygen gas were collected over water at 20 degress C and the total pressure of the wet gas were 670 mm Hg, what would be the partial pressure of the oxygen?

2007-02-07 14:15:38 · 4 answers · asked by confused 2

2007-02-07 14:00:48 · 6 answers · asked by Anonymous

...can never have atoms with eight valance electrons even when it forms bonds? why?-personally how do you know this?

a. hydrogen
b. oxygen
c. carbon
d. nitrogen

2007-02-07 13:53:11 · 4 answers · asked by lisa r 1

The molecular formula of perylene is C20H12. What is the molecular weight? What is the empirical formula? What is the empirical formula weight? What is the relationship between the molecular and empirical formula weights?

2007-02-07 13:41:38 · 2 answers · asked by Alan l 1

2007-02-07 13:38:32 · 1 answers · asked by shunda 1

11th grade chemistry question. Having trouble finding answer.

2007-02-07 13:35:50 · 1 answers · asked by lacybsmom 2

Which of the following is not a strong base?

A. Ca(OH)2
B. KOH
C. NH3
D. LiOH
E. Sr(OH)2
I'm thinking it's the NH3 but I just wanted to be sure.

2007-02-07 13:26:38 · 1 answers · asked by Anonymous

What mass of NaOH is required to react exactly with 25.0 mL of 1.2 M H2SO4?

A. 1.2 g
B. 1.8 g
C. 2.4 g
D. 3.5 g
E. none of these

2007-02-07 13:25:21 · 1 answers · asked by Anonymous

2007-02-07 13:07:22 · 3 answers · asked by stardust6547 2

Can a flame from a propane heater cause it to explode if it is aimed at the tank?

2007-02-07 13:06:09 · 5 answers · asked by Walter S 2

2007-02-07 12:59:28 · 1 answers · asked by bobby a 4

it would be great if you guys had like a site or soimething i could go to :D

2007-02-07 12:51:58 · 4 answers · asked by Anonymous

Say for instance, that you are an awesome super-hero(ine). Not only are you the most awesome hero(ine) ever, but you also have the ability to combust molecules. Unfortunately, all you can really do with it so far is some cheesy light show, so no one will take you seriously.

What are some useful/helpful/practical things that you could do with your awesome powers? I could really use some help with this one.

2007-02-07 12:44:10 · 3 answers · asked by Jubilation Lee 1

2007-02-07 12:42:25 · 3 answers · asked by person 2

What happens to potential energy of ice while it melts? Why?

2007-02-07 12:39:08 · 7 answers · asked by pixiedust 2

Plz answer my question before V-day cuz i need to write a paragraph on it.

2007-02-07 12:37:55 · 1 answers · asked by angel_ai 1

kindly answer this quest. right now............please do...

2007-02-07 12:37:41 · 1 answers · asked by SHERRY S 1

2007-02-07 12:33:49 · 11 answers · asked by Anonymous

If you either say a,b,c,d,e for each one, that would be superb! More than one can apply!

1.What lipid tupe is the foundatino of cell membranes?
a. trigylceride
b. steriod
c. vitamin d
d. phospholipid
e. prostaglandin

2. Absence of which of the following niterogen contaning bases would prevent protein synthesis?

a. adenine
b. cytosine
c. guanine
d. thymine
e. uracil

3. ATP is not associated with
a. a basic nucletoide structure
b. high-energy phosphate bonds
c. deoxribose
d. inorganice phospate

4. The element essential for normal thyroid fucntion is:
a. iodine
b. iron
c. copper
d. selenium
e. zinc

5. What element is present in all proteins but absent from carbs and fats?
a. carbon
b. oxygen
c. hydrogen
d. nitrogen

I appreciate anyone who can answer these! Thanks!!

2007-02-07 12:28:31 · 5 answers · asked by Anonymous

2007-02-07 12:27:47 · 11 answers · asked by Anonymous

this is in chemistry.

2007-02-07 12:25:53 · 3 answers · asked by Asaria H 1

Anyone know?The person with the most understandable answer will be the feavorite answer.

2007-02-07 12:21:04 · 10 answers · asked by Anonymous

If you had acid antacid indigestion, ehich antacid would you use? Why?
Rolaids have a pH of 0
Tums have pH of 1
Alka-Seltzer have pH of 3

2007-02-07 12:18:49 · 3 answers · asked by Cutie 4

Consider the problem Trying to start a campfire or bargeque fire. the fire seems to be going and then goes out. this happens a few times and eventually it catches and a good hot fire is produced. Explain in terms of reaction kinetics. How does the wind enter into this explanation?

2007-02-07 12:08:33 · 7 answers · asked by Ballerina 5

PROJECT!!!!

2007-02-07 12:07:32 · 3 answers · asked by tokin_white_guy 1

Which metal is the most reactive?...why?

which non-metal is the most reactive?... why?

2007-02-07 12:06:44 · 3 answers · asked by no name 1

Moley is a mole who enjoys guacamole. To make lots of guacamole, moley sets out to buy some avocados. He is going to buy 1.3 moles of avocados. How many avocados is that?

Answer: 1.3 miles * 6.02*10^23 (avogadro's number)
=7.83*10^23 Avocado's

Alright this was just introduction. Now comes the fun part!

a)If each avocado has a density of 0.89 grams per cm^3, and each avocado has a mass of 118 grams, how much volume in cm^3 does Moley's collection of avocados consume?

b)If moley puts all his guacamole in to a hemispherical bowl, how big will the radius of his bowl need to be to fit all the guacamole in it (assume the guacamole's total volume is the same as the volume of the avacados).

c) If Moley's avocados are 8.7 cm long and the avocados were stacked end on end, how many times would the stack of avocado's stretch from the Earth to the sun? (Distance from the eart to the sun is 93 million miles; 1 cm = 0.00001KM and .621 miles = 1 Kilometer)

2007-02-07 12:04:59 · 6 answers · asked by Abdul S 3

A particular brand of gasoline has a density of 0.737 at 25 . What mass of this gasoline would fill an empty 14.1 tank?

2007-02-07 12:04:49 · 4 answers · asked by Anonymous

a) NH3 b) BF3 c) CH3+ d)CH3 e)PH3 f)H3O+

2007-02-07 11:56:16 · 2 answers · asked by tonythewombat 1

Whicch key property do all indicators possess?

2007-02-07 11:54:15 · 1 answers · asked by Cutie 4