Chemistry - April 2007

2007-04-08 13:41:48 · 1 answers · asked by klsf c 1

Alkali metal hydroxides are sometimes used to "scrub" excess carbon dioxide from the air in closed spaces (such as submarines and spacecrafts). For example, lithium hydroxide reacts with carbon dioxide according to the unbalanced chemical equation.
LiOH(s) + CO2(g) Li2CO3(s) + H2O(g)

Suppose a lithium hydroxide cannister contains 155 g of LiOH(s). What mass of CO2(g) will the cannister be able to absorb?
grams?

If it is found that after 24 hours of use the cannister has absorbed 106 g of carbon dioxide, what percentage of its capacity has been reached?
%?

2007-04-08 13:41:32 · 1 answers · asked by Anonymous

An experiment that led to the formation of the new field of organic chemistry involved the synthesis of urea, CN2H4O, by the controlled reaction of ammonia and carbon dioxide.
2 NH3(g) + CO2(g) CN2H4O(s) + H2O(l)

What is the theoretical yield of urea when 100. g of ammonia is reacted with 100. g of carbon dioxide?
grams?

2007-04-08 13:38:12 · 2 answers · asked by Anonymous

1)derivation comparing gas density to the ideal gas law:
2)what 3 things does density of a gas depend on?
3)what gas do hot air balloons use and why?
4)diffusion is:
5)effusion is:

Thanks so much I forgot my book at school and need these answers before i can do my homework!

2007-04-08 13:28:54 · 1 answers · asked by Anonymous

Some people/books say that blood is heterogeneous while some argue that it is homogeneous. I can see why people see it differently, but if on a test (e.g., SAT II Chemistry) they asked if blood was heterogeneous or homogeneous, what would be the answer?

2007-04-08 13:09:26 · 3 answers · asked by Anonymous

Also, if possible, could anyone help describe what happens to sulfur atoms as sulfur (powder) is slowly heated and then poured into cold water? how do the particles behave?

2007-04-08 13:03:37 · 2 answers · asked by Alta 1

chemistrt question

2007-04-08 12:50:30 · 2 answers · asked by JERRY R 1

2007-04-08 12:03:53 · 1 answers · asked by Bien M 1

The critical temp of sulfur dioxide is 157.2C while that of water is 374.0C What does this indicate about the polarity of the sulfur dioxide molecules compared to that of the water molecules?

2007-04-08 11:39:53 · 1 answers · asked by Anonymous

molal freezing point depression constant for
water is 1.86 °C/m. (formula weight = 164 g/mol)

2007-04-08 10:32:32 · 1 answers · asked by surfing86 2

2007-04-08 10:18:56 · 3 answers · asked by josh3119 2

Cu (s) + 4HNO3 (l) → Cu(NO3)2 (aq) + 2NO2 (g) + H2O (l)

2007-04-08 10:09:00 · 2 answers · asked by Anonymous

Given that Kw for water has a value of 51.3e-14 at 100C, the pH of pure water at 100C is...

5.626
6.145
7
7.213
8.316

I have no clue how to solve these kinds of questions. I thought Kw can only be 1e-14. Thanks to anyone.

2007-04-08 09:45:46 · 1 answers · asked by bigmanonthewall 3

6. electrical fires cannot be safely put out by dousing them with water. however, fire extinguishers that spray solid carbon dioxide on the fire work very effectively. this method works because carbon dioxide..
answer: displaces the oxygen

7.when a metal is heated in a flame, the flame has a distinctive color, this information was eventually extended to the study of stars because..
Answer: the color specta of stars indicate which elements are present.

8. which statement best describes the density of an atom's nucleus?
Answer: the nucleus occupies very little of the atom's volume but contains most of its mass.

9. why are enormous amounts of enerygy required to seperate a nuclues into its component protons and neutrons even though the protons in the nuclues reprel each other?
answer: the focres holding the nuclues together are much stronger than the repulsion betweeen the protons.

2007-04-08 09:29:30 · 3 answers · asked by Simon W 1

2007-04-08 09:23:48 · 2 answers · asked by osvaldo c 1

2007-04-08 09:13:21 · 4 answers · asked by Nica 1

What is the hydroxide ion concentration in a solution made by adding 117 grams of NaCl to enough water to make 4.0 L of solution?

2007-04-08 09:04:46 · 1 answers · asked by COOL KID 2

2007-04-08 08:52:48 · 1 answers · asked by ? 3

The Ksp for Mg(OH)2 = 5.6 x 10^-12. What is the molar solubility of Mg(OH)2 in a buffer solution of pH 10.85?

2007-04-08 08:32:29 · 1 answers · asked by me 2

Calculate the change in internal energy, (change)E, of a system that absorbs 300kJ of energy as heat from the surroundings and does 350kJ of work.

2007-04-08 07:54:49 · 2 answers · asked by bigpapamarek 1

Calculate the energy, expressed in Joules, of a photon of light with frequency v=6.30x10^14 s^-1

2007-04-08 07:53:32 · 1 answers · asked by bigpapamarek 1

The property of certain substances, such as calcium chloride, to take up water from the air to form a solution, is called _________.

2007-04-08 07:44:31 · 2 answers · asked by Didi 1

2007-04-08 07:21:49 · 6 answers · asked by Didi 1

(by alchohol i mean the thing you put on your scare to kinda cure it)

2007-04-08 07:15:22 · 2 answers · asked by gula_omer 1

2007-04-08 07:09:30 · 3 answers · asked by gula_omer 1

2007-04-08 07:00:40 · 2 answers · asked by doggyloveblue 1

equilibrium temp. of the mixture.

I have no idea?! Please help!

2007-04-08 06:39:43 · 1 answers · asked by ma.roddy 1

This doesn't seem to be working; I have 10mL of 1.00mM I2 solution, and it's being mixed with 25mL of a .5M HCl solution. However, the number i get is way off; the equation sets up like this:

1.00mM /10mL = C2/35mL

When I solve for C2 here, I get 3.5mM???? The concentration can't do that.

in steps; 1.00/10 = .01
.01*35= 3.5

2007-04-08 06:30:45 · 1 answers · asked by Matt S 2

2007-04-08 06:27:30 · 1 answers · asked by navya 1

When water is warmed from 0C two opposing effects occur. Hydrogen bonds ________, enabling water molecules to crowd more closely together. The water molecules tend to spread apart as a result of their _________.

2007-04-08 05:37:15 · 3 answers · asked by Meno 1