Chemistry - April 2007

be sure to includes both the pro's and cons of both embryonic and adult stem cell use that lead to your conclusions.
REMEMBER DIHYDROGEN MONOXIDE!

2007-04-24 19:23:11 · 3 answers · asked by randy_nephro 1

si02+3c-->2c0+SiC

2007-04-24 19:17:59 · 2 answers · asked by randy_nephro 1

2007-04-24 19:08:07 · 3 answers · asked by Bekhzod M 1

The answer will be provided will be very helpful for my research.

2007-04-24 19:04:01 · 8 answers · asked by jaira 1

2007-04-24 18:55:09 · 2 answers · asked by Miss Bio 1

is known to be 200 torr at 25C. the gases are allowed to effuse through a pinhole, and is found that gas A escapes at three times the rate of N2. what is the molar mass of gas A?

2007-04-24 18:53:08 · 1 answers · asked by Miss Bio 1

2007-04-24 18:46:44 · 1 answers · asked by mick 1

Which one has the greater buffer capacity? why?
(a) 50mL of 0.20M NH4Br-0.30M NaNO2 or
(b) 50mL of 0.40M NH4Br-0.60M NH3

2007-04-24 18:31:22 · 2 answers · asked by ediii69 1

2007-04-24 18:14:40 · 2 answers · asked by Anonymous

How many grams of ruthenium contains the same number of atoms as 10.7 micrograms of hafnium?

2007-04-24 18:13:39 · 1 answers · asked by demolitionman 1

How many neutrons does the nuclide contain ?

2007-04-24 18:11:36 · 1 answers · asked by Dd 1

How would someone go about converting CO2 into sugar? Is it only possible in a lab?

2007-04-24 17:42:29 · 3 answers · asked by Billy188 1

Nickel ion form the complex ion {Ni(NH3)6}2+, Kf=5.6x10^8. intially formed when .002M nickel sulfate is added to .10M ammonia. Predict if nickel (2) hydroxide wil precipitate from the solution when .01M sodium hydroxide is added to the complex ion. The Ksp for Ni(OH)2 is 2.0x10^-15

2007-04-24 17:14:07 · 3 answers · asked by Live and Love 1

What is half of a sphere?

2007-04-24 17:06:30 · 2 answers · asked by Princess d 1

One text book says the first shell holds two electrons, the second 8 and the third 8 as well, but the other book says the first holds 2, second 8 and the third is 18. What the??? Which one is correct? Why is it different?

2007-04-24 16:56:32 · 2 answers · asked by dogvirusdoo 1

NOTE: Read the equations left to right



a) NH3 + H2O ↔ NH4(+) + OH− NH3 is the Lewis base


b) HF + H2O ↔ H3O(+) + F− Water is the Lewis acid


c) C5H5N + H2O ↔ C5H5NH(+) + OH− Water is the Lewis base


d) Al(H2O)6(3+) + H2O ↔ H3O(+) + Al(H2O)5OH(2+) Al(H2O)63+ is the Lewis acid


e) NH4(+) + H2O ↔ H3O(+) + NH3 Water is the Lewis acid


Note: i already tried a) c) as my answer and it is wrong. PLZ HELP ME ASAP

2007-04-24 16:55:49 · 1 answers · asked by mariamm_00 1

At a particular temperature, K = 1.00×102 for the reaction:


H2(g) + F2(g) ⇔ 2HF(g)


In an experiment, at this temperature, 1.30 mol of H2 and 1.30 mol of F2 are introduced into a 1.01-L flask and allowed to react. At equilibrium, all species remain in the gas phase.
What is the equilibrium concentration of H2, HF, F2?

2007-04-24 16:34:19 · 2 answers · asked by Jay R 1

What is the binding energy (KJ/mole) of radium-226, whose mass is 226.0254 g/mole .



NOTE: The answer should be a positive number.





Enter a numeric answer only do not include units in your answer.

2007-04-24 16:26:16 · 2 answers · asked by Anonymous

Based on the readings in your text, which of the following are true statements ?



a) beta-particle emission increases the atomic number of the
parent nucleus by one unit


b) During beta-particle emission from a nucleus, a protron is converted
to a neuton


c) In the nuclear process known as electron capture, the mass number remains constant
while the atomic number decreases by one unit


d) Beta radiation is by far the most harmful type of radiation to living tissue


e) Based on the number of protons and neutrons, we would expect chlorine-36 to be a stable isotope

2007-04-24 16:25:46 · 1 answers · asked by Anonymous

1.What is the atomic number ?

2.How many neutrons does the nuclide contain ?

2007-04-24 16:25:13 · 1 answers · asked by Anonymous

Based on the readings in your text, which of the following are true statements ?



a) beta-particle emission increases the atomic number of the
parent nucleus by one unit


b) During beta-particle emission from a nucleus, a protron is converted
to a neuton


c) In the nuclear process known as electron capture, the mass number remains constant
while the atomic number decreases by one unit


d) Beta radiation is by far the most harmful type of radiation to living tissue


e) Based on the number of protons and neutrons, we would expect chlorine-36 to be a stable isotope

2007-04-24 16:23:59 · 1 answers · asked by sera 1

Consider the equilibrium system

2NaHCO3(s) <=> Na2CO3(s) + CO2(g) + H2O(g)

How does the equilibrium position shift as a result of each of the following disturbances? (For each statement select L-Left, R-Right, or N-Not.)
A) Mg(ClO4)2(s) is added as a drying agent to remove H2O
B) NaHCO3(s)is added
C) Dry ice is added at a constant T
D) The volume is reduced by one-half at a constant T
E) 0.20 atm argon is added

2007-04-24 16:23:43 · 1 answers · asked by socr8711 2

What is the binding energy (KJ/mole) of radium-226, whose mass is 226.0254 g/mole .

NOTE: The answer should be a positive number.





Enter a numeric answer only do not include units in your answer.

2007-04-24 16:22:08 · 3 answers · asked by sera 1

2007-04-24 16:19:32 · 4 answers · asked by trust2400 3

The first step in industrial nitric acid production is the catalyzed oxidation of ammonia. Without a catalyst, a different reaction predominates:

4NH3(g) + 3O2(g) <=> 2N2(g) + 6H2O(g)

When 0.0150 mol NH3(g) and 0.0280 mol O2(g) are placed in a 1.00 L container at a certain temperature, the N2 concentration at equilibrium is 1.40×10-3 M. Calculate Kc for the reaction at this temperature.

2007-04-24 16:19:27 · 1 answers · asked by socr8711 2

A solution of sucrose is saturated at 130 grams of sucrose in 100 grams of water at a particular temperature. How many grams of sucrose are needed to make a saturated solution of sucrose in 300 grams of water?


A. 130 grams
B. 260 grams
C. 330 grams
D. 390 grams

2007-04-24 16:18:44 · 3 answers · asked by Haileybabie<3 1

2007-04-24 16:14:41 · 1 answers · asked by nikkie70187 1

I have to solve the following problems and I am just lost I need to find the theoretical molarity of the base useing this formula
M acid x V acid = M base x V base
Volume of acid (mL) actually used 25.00


Molarity of acid actually used (mol/L) 0.24


Volume of base (mL) actually used 8.03, 7.72, 7.62 (I need to solve the problem three time useing each one of these)

Theoretical Molarity of base, based upon formula from above(show your work):

Thanks for you help, I think my rain has stoped working.

2007-04-24 15:54:21 · 3 answers · asked by Heavy Metal 3

I have a copper strip and a zinc strip. Along with common household materials what kind of cool reactions can I make, preferably an explosion?

2007-04-24 15:52:11 · 2 answers · asked by Anonymous

would treating Fe(OH2)_6^3+^ or Cr(OH2)6^3+ with 1 M (NH_4_)_2_CO_3_ give a precipetite? why?

2007-04-24 15:51:27 · 1 answers · asked by BMac 3