Science & Mathematics - 1 November 2007

Calculate the solubility in moles per liter of Hg2Cl2,
Ksp = 1.10 x 10-18 ,
Hg2Cl2(aq) ---> Hg22+ + 2Cl-

2007-11-01 07:34:57 · 3 answers · asked by mimi 1 in Chemistry

Calculate the pH of the solution that results from the addition of 0.040 moles of HNO3 to a buffer made by combining
0.500 L of 0.080 M NH4Cl ( use Ka = 5.60 x 10 -10 )
and 0.500 L of 0.160 M

2007-11-01 07:33:51 · 4 answers · asked by mimi 1 in Chemistry

Since the human brain is so big - sometimes causing female pelvics to break while giving birth - wouldn`t natural selection work against humans evolving to have bigger brains?

Or are my facts all wrong? Let me know, this question comes from a gap in my understanding.

2007-11-01 07:30:35 · 9 answers · asked by Future 5 in Biology

references if possible...

2007-11-01 07:24:56 · 1 answers · asked by Anonymous in Chemistry

silver nitrate? is it covalent or ionic????

2007-11-01 07:24:22 · 2 answers · asked by jennifer s 1 in Chemistry

1. How is the number of electrons in a neutral atom related to the atomic number of the element?
2. What information does the mass number of an isotope provide?
Is the answer to number 2 ... They show the average mass of an atom in a sample.

THANK YOU!!!!!!!!!!!!!!!

2007-11-01 07:23:45 · 1 answers · asked by babygrlnpnk999 1 in Chemistry

If I have 5.0 X 10^21 atoms - how can I convert this to molecules and then to moles?

2007-11-01 07:22:41 · 4 answers · asked by confusedchemist 1 in Chemistry

2007-11-01 07:22:02 · 1 answers · asked by Anonymous in Biology

If a stimulus on the receptor portion of a sensory neuron is above the threshold level, a further increase in the intensity of this stimulus will most likely cause the?

a. frequency of the impulse production to increase
b. strength of the neuronal impulse to increase
c. impulse to move faster
d. neuron membrane to become less permeable to sodium
e. neuron membrane to become more negatively polarized

2007-11-01 07:21:09 · 1 answers · asked by Anonymous in Biology

2007-11-01 07:20:13 · 1 answers · asked by Anonymous in Biology

2007-11-01 07:16:08 · 5 answers · asked by Sarah. 1 in Physics

Calculate the following using the volume equation.

Find the volume of a box with length of 35 cm, width 15 cm, and height 2 cm

Calculate the following using the area equation.

What is the area of a fence that measures 60 m X 60 m?


Calculate the following using the volume equation.

Find the volume of a box with length of 10 cm, width 5 cm, and height 3 cm


Calculate the following using the area equation:

Calculate the area of a yard that measures 75 m X 40 m


Calculate the following using the volume equation.

Find the volume of a box with length of 20 cm, width 10 cm, and height 8 cm

2007-11-01 07:15:44 · 2 answers · asked by V.S. 2 in Chemistry

i dont care if you think it's discovered, but why could it be created?

2007-11-01 07:13:59 · 8 answers · asked by karla 2 in Earth Sciences & Geology

2007-11-01 07:13:55 · 2 answers · asked by Jami 1 in Biology

2007-11-01 07:13:04 · 4 answers · asked by Hannah J 1 in Biology

The perimeter of a right angled triangle is 70 and the sum of the squares of its three sides is 1682. Find the lengths of the three sides

2007-11-01 07:11:48 · 6 answers · asked by rma 1 in Mathematics

what provides the centripetal force for the moon's orbit around Earth?

2007-11-01 07:10:11 · 6 answers · asked by thisisjakethomas 1 in Astronomy & Space

such as sodium and water; 2Na+2H2o ->2NAOH +H2

2007-11-01 07:09:21 · 3 answers · asked by Anonymous in Chemistry

Any good websites that help someone with very basic science knowledge?

2007-11-01 07:08:55 · 7 answers · asked by snowball 3 in Engineering

2007-11-01 07:07:28 · 6 answers · asked by Anonymous in Zoology

2007-11-01 07:06:33 · 2 answers · asked by amanda_setters 1 in Chemistry

2007-11-01 07:06:32 · 2 answers · asked by Anonymous in Engineering

if x -> infinity and f(x)=(square root of (9x^6 - x) ) / (x^3 +1)

2007-11-01 07:06:06 · 3 answers · asked by Moi 2 in Mathematics

2007-11-01 07:06:02 · 1 answers · asked by amanda_setters 1 in Chemistry

Is this some sort of weird weather thing?.....noticed it yesterday too

2007-11-01 07:04:48 · 10 answers · asked by Elaine R 2 in Astronomy & Space

Please help; I am stuck.

2007-11-01 07:01:45 · 5 answers · asked by RogerDodger 1 in Mathematics

In addition to continuous radiation, fluorescent lamps emit sharp lines in the visible region from a mercury discharge within the tube. Much of this light has a wavelength of 436 nm. What is the energy (in J) of one photon of this light?

2007-11-01 06:58:23 · 1 answers · asked by jnester0289 1 in Chemistry

2007-11-01 06:57:37 · 2 answers · asked by Karthick S 1 in Engineering

If two prospective parents both have siblings who had a recessive genetic disorders, what is the chance that they would have a child who inherits the disorder?

2007-11-01 06:56:27 · 2 answers · asked by Anonymous in Biology

2007-11-01 06:55:34 · 16 answers · asked by Anonymous in Mathematics