Science & Mathematics - 2 October 2007

What is the balanced chemical equation for the net ionic reaction that occurs when acetic acid is mixed with nitric acid?

2007-10-02 19:15:59 · 3 answers · asked by Erick T 1 in Chemistry

Without using tables or a calculator, solve the equation 4^x + 2^ 2(x - 1) = 160

How to do? I don't even understand...

2007-10-02 19:12:32 · 5 answers · asked by Anonymous in Mathematics

Given that y = ax^b + 5, and that y = 7 when x = 3 and y = 9.5 when x = 2, find the value of a and of b.

Ans: a = 18, b = -2

Please help...

2007-10-02 19:10:20 · 3 answers · asked by Anonymous in Mathematics

Name Each Covalent Compound:
A. HgCl2
B. IF5
C. N2O5
D. Cl2O
E. HgS
F. PCl5

2007-10-02 19:06:43 · 3 answers · asked by Happy Killa Pants 2 in Chemistry

Is speaking a longitudinal wave or a transverse wave. Why is that so. Also does rarefaction have a minimum or maximum pressure variation and why?

Thanks

2007-10-02 19:00:12 · 1 answers · asked by Anonymous in Physics

How many grams chlorine are in 300. mL seawater if density of seawater is 1.025 g/mL?

2007-10-02 19:00:03 · 2 answers · asked by Anonymous in Chemistry

2007-10-02 18:58:22 · 2 answers · asked by asatodaniel 2 in Astronomy & Space

Find the equation of the indicated line and write the equation in y = mx + b format
(-3,2) slope is -4
I don't understand how to get the answer
thanks for your help

2007-10-02 18:54:54 · 9 answers · asked by Boo Radley 4 in Mathematics

2007-10-02 18:46:26 · 24 answers · asked by James the Just 3 in Astronomy & Space

I'm looking at the protein bovine rhodopsin.

I'm suppose to find out how far the closest disulfide bond is from the methionine end of the protein.

Currently i'm using .... i'm not sure what the site is actually called, but if you google genbank its the first hit.

Using the CN3D program. It shows me 3d view of the molecule and then spits out the amino acid sequence.

Is there a way i can look at the sequence to figure out where this bond is?

Err...do i look for the closest cystein...and assume thats where the disulfide bond occurs...with another cystein.. I'm a chemical engineer not biochemist....i think i learned somewhere years ago that cysteins form the bonds.....but i'm having no luck googling that.

2007-10-02 18:46:10 · 2 answers · asked by My name is not bruce 7 in Biology

I'm a little confused on the subject of nonremovable vs. removable discontinuity. I know removable means you could make a graph continuous by substituting in a different value, but does that apply only when a y value exists but just isn't continuous?

For example...if you had function that simplified to:

(x-2) / (x-2)(x+2)

You would factor out (x-2) and have discontinuity at 2. But since no y value for x=2 exists at all, is it removable or nonremovable?

2007-10-02 18:45:48 · 4 answers · asked by Anonymous in Mathematics

2007-10-02 18:43:37 · 2 answers · asked by buddah 2 in Botany

i have the answers 8/3 ,5 ,5. I want to know how could i get those answers i try but dont undestrand it

2007-10-02 18:41:52 · 4 answers · asked by diego j 2 in Mathematics

Hello, I want to intensively use a fogmachine inside a room. will its chemicals harm the people insdie the room? just want to know
the kind of chemicals they use for this purpose.

2007-10-02 18:40:22 · 3 answers · asked by THOR 1 in Physics

How come when you're getting your DTP (DTap) shot, your arm is extremely sore afterwards? I asked my doctor the question and he didn't seem to answer. Also, if you're getting the Gardasil shot and also your PPD on the same day as your DTP (DTaP) does it cause you to feel sicker? I know that with Gardasil itself, it makes you feel sick, but what about the other shots?

2007-10-02 18:40:18 · 2 answers · asked by Babyboyduejuly21 2 in Medicine

I don't really care the answer to the question, I more care about how to solve it. Please explain fully and explain this like you would to someone who has no idea how to do this. My teacher sucks, so idk how to do these.
6n^2-11n-2

2007-10-02 18:37:06 · 6 answers · asked by Brian M 3 in Mathematics

Give the empirical formula for the binary compound formed by the most common monatomic ions formed by each pair of elements:
A. zinc and sulfur
B. barium and iodine
C. magnesium and chlorine
D. silicon and oxygen
E. sodium and sulfur

2007-10-02 18:36:44 · 2 answers · asked by Happy Killa Pants 2 in Chemistry

Predict the charge on the most common monatomic ion formed by each element:
A. Cl
B. P
C. Sc
D. Mg
E. As
F. O

2007-10-02 18:35:11 · 3 answers · asked by Happy Killa Pants 2 in Chemistry

2007-10-02 18:33:53 · 3 answers · asked by Anonymous in Biology

Well, aren't they? So if I have a big fluffy hat and a tennis ball that have the same mass, they have the same weight, right? Now I judge one to be heavier than the other...that has to do with pressure, right? I feel more or less pressure on a certain amount of area on my hand, and I judge one to be heavier than the other, correct? Or not?

2007-10-02 18:32:40 · 8 answers · asked by Burnt Toast 1 in Physics

i have to find the points at which the horizontal tangent line exists.

2007-10-02 18:30:11 · 2 answers · asked by singer4jc108 2 in Mathematics

I am horrible at math and my job is getting me behind in my chemistry. can in one help with the following questions.

1.Calculate the volume of 2.50 moles of zinc, assuming the density of the metal to be 7.14 g/cc.

2.Calculate the volume of 1.25 moles of magnesium, assuming the density of the metal to be 1.74 g/cc.

2007-10-02 18:29:17 · 1 answers · asked by scott c 1 in Chemistry

2007-10-02 18:26:24 · 7 answers · asked by Burnt Toast 1 in Chemistry

Okay, so We're doing Complete the Squares.
And I have an equation like this. I get stuck though.
H(T)=10t^2+300t+9750
H(t)=10(t^2-30t)+9750
Okay, here I get very confuzzeled.
How in the world do I get whats in the brakets
This is what the step after is..help.
H(t)=10(t^2-30t+225-225)+9570
Please tell me how I'm supposed to get to 225 in here. I don't understand at all.

2007-10-02 18:25:16 · 8 answers · asked by Anonymous in Mathematics

2.4 * 1/2 * (x^2 + 25)^(-1/2) * 2x - 1 = 0

killing me. ughhh

2007-10-02 18:18:05 · 4 answers · asked by AppleCard! 2 in Mathematics

The distance between two towns, A and B, is 100 km. Mr Paul drove from A to B at an average speed of v km/h.
Q1) Write down an expression, in terms of v, for the time, in hours, that he took to complete the journey from A to B.

On the return journey, his average speed was 6km/h greater than his speed from A to B.
Write down an expression, in terms of v, for
Q2) his speed for the journey from B to A,
Q3) the time, in hours, that he took for the journey from B to A.

2007-10-02 18:14:49 · 2 answers · asked by Anonymous in Mathematics

I need help...can't figure it out...

2007-10-02 18:07:53 · 2 answers · asked by .Cami.B. 2 in Chemistry

2007-10-02 17:57:55 · 3 answers · asked by Hazel 4 in Mathematics

3.An atomic gas absorbs red light of wavelength 653 nm


What is the energy difference (kJ) between the two quantum states involved in the absorbtion ?

4.If a certain source emits radiation of wavelength 355. nm what is the energy, in kJ, of one mole of photons of this radiation?

2007-10-02 17:56:26 · 1 answers · asked by Sadie G 1 in Chemistry

x = (x1, x2, ..., xn), y = (y1, y2, ..., yn) element of R^n.

2007-10-02 17:49:42 · 2 answers · asked by bubbula48 1 in Mathematics