Science & Mathematics - 10 February 2007

2007-02-10 11:32:22 · 12 answers · asked by John 2 in Biology

How do you do this problem:

-2 (sq. root of x + 2) + 6 = -10

thanks for the help!!!

2007-02-10 11:29:53 · 8 answers · asked by Mia16 3 in Mathematics

This is a question for my homework and i do not think it is possible correct me if i am wrong.. thanks

2007-02-10 11:29:15 · 4 answers · asked by ryan m 1 in Mathematics

I need for someone to write out these reactants and predict the products. Here they are, please write the number of the one that you solved next to it:

1) hydrogen peroxide (catalyzed by manganese dioxide)
2) zinc + hydrochloric acid
3) sulfuric acid + sodium hydroxide
4) sodium + hydrogen
5) acetic acid + copper

What I mean by writing out the reactants and predicting the products is, say I have silver nitrate + zinc chloride. Then the reactant would be AgNO3. I have to predict the product, which would be AgCl + Zn(NO3)2. so, the whole thing would be AgNO3---> AgCl+ Zn(NO3)2. Thanks so much to anyone who can solve these. I know pretty much how to do them, but some of them are really hard to figure out. Again, thanks!

2007-02-10 11:28:37 · 3 answers · asked by Dana Mulder 4 in Chemistry

i read that when wind hits rocks, it's a Bb (b=flat) and that some black hole makes a very low Bb tone... is the entire universe tuned to Bb?

2007-02-10 11:28:36 · 4 answers · asked by 3.14 1 in Earth Sciences & Geology

a. injecting weakened or dead viruses
b. having a disease
c. injecting antibodies
d. injecting a vaccine.
which is the correct answer ?

2007-02-10 11:27:21 · 3 answers · asked by Anonymous in Biology

The following sound waves have what velocity?
(a) Midddle C, f = 256 Hz and lamda = 1.34 m ___m/s
(b) The note A, f = 440.0 Hz and lamda =78.0 cm ____m/s
(c) A siren with f = 744.0 Hz and lamda = 46.1 cm ___m/s
(d) A note from stereo with f =2700.0 Hz and lamda = 12.70 cm ____m/s

2007-02-10 11:26:48 · 2 answers · asked by Hey ;) 3 in Physics

A sound wave with a frequency of 360 Hz moves witha velocity of 380 m/s. what is the distance from one condensation to the next?____m

2007-02-10 11:22:43 · 2 answers · asked by Hey ;) 3 in Physics

A warning buoy is observed to rise every 5.8 s as crests of waves pass it. (a) what is the peroid of these waves?____s
(b) what is the frequency?____Hz

2007-02-10 11:21:19 · 2 answers · asked by Hey ;) 3 in Physics

2007-02-10 11:18:50 · 5 answers · asked by topaz898 1 in Astronomy & Space

(y^2+2y)/(y^2+y-2) divided by (y+5)/(y^2+4y-5)

2007-02-10 11:17:28 · 6 answers · asked by music man 2 in Mathematics

If the velocity of a 580-Hz sound is 1045 ft/s in the air and 5470 ft/s in seawater, find the wavelength of this sound in (a) air and____ft
(b) seawater.___ft

2007-02-10 11:17:05 · 1 answers · asked by Hey ;) 3 in Physics

a. interferon against viruses.
b. lysozyme in saliva and tears to destory bacteria
c. antibodies or proteins produce in response to an antigen
d. antibodies in response to bacterial toxins

2007-02-10 11:15:18 · 5 answers · asked by Anonymous in Biology

I asked this in the "Envoronment" section and have gotten no useful responses thus far. Perhaps you chemistry folks can enlighten me.

So... Al Gore and Richard Branson have offered up a $25 million prize for the best method to remove 1 billion tonnes of CO2 per year for 10 years from the atmosphere. I'm trying to wrap my brain around the scope of the challange and am wondering exactly how much CO2 there is on average in a cubic meter of air. In other words, how many cubic meters of air would one have to remove all of the CO2 from in order to calim the removal a tonne of CO2?

2007-02-10 11:12:15 · 3 answers · asked by Anonymous in Chemistry

Calculate the molality of HCl from the following data:

Formula weight(amu) = 36.465
Density of solution (g/mL) = 1.19
Weight % = 37.2
Molarity = 12.1 moles solute/L solution

I think the molality should end up being 6.02 moles solute/kg solvent but i don't know how to calculate this because I got the answer from someone else who didn't show their work. Help?

2007-02-10 11:09:31 · 2 answers · asked by a zany lark 1 in Chemistry

Please help me to find articles about the chemical element "Curantyl".

2007-02-10 11:09:22 · 1 answers · asked by Hamza 2 in Chemistry

2007-02-10 11:05:55 · 3 answers · asked by Anonymous in Botany

What is the oxidation number for chlorine. ?

knowing that that there is 7 valence electrons. and it would be easier to take one electron away to get to a happy atom. wouldn't the oxidation number be +1 ? right ?

if not. how do you get it ?

2007-02-10 11:05:34 · 3 answers · asked by luckyplaya23 2 in Chemistry

a general idea...

2007-02-10 11:05:31 · 1 answers · asked by calla 2 in Earth Sciences & Geology

I need to know the formula for buoyancy for my science project. I would like an example too.

2007-02-10 11:03:54 · 5 answers · asked by Jared 2 in Engineering

my topic is- What Types of Vitamins Dissolve in Your Stomach The Fastest? comparing 3 types of the same vitamins w/ diff coatings. how do i display this and has this ever been done before? thanks 4 ur help.

2007-02-10 11:02:45 · 2 answers · asked by Kim P 1 in Chemistry

a. Females begin releasing eggs and hormones secretions during puberty and slow down or stop during menopause.
b. In the female, FHS stimulate follicle development in the ovary
c. All of the pontential eggs in a female are present at her birth
d. Fertilization , if it occurs will usually happen in the uterus

2007-02-10 11:02:06 · 10 answers · asked by Anonymous in Biology

it is considered both living and non-living and so how could it have evolved from a living thing?

i don't actually believe in evolution, i'm just curious to see what you come up with.

2007-02-10 11:01:57 · 7 answers · asked by this is me! 3 in Biology

which quantum physicist out there is closest to it??

2007-02-10 11:01:02 · 8 answers · asked by Tony M 1 in Physics

Is it a scientific possiblity that a person can teleport his/her body to another location on earth with using only his/her mind? In what ways could it be possible?

2007-02-10 11:00:31 · 10 answers · asked by Source 4 in Other - Science

2007-02-10 10:59:47 · 3 answers · asked by Anonymous in Weather

2007-02-10 10:59:11 · 14 answers · asked by linso 1 in Astronomy & Space

I am smart, especially in math and science, and would like to work at NASA or for the millitary.

2007-02-10 10:55:07 · 5 answers · asked by Anonymous in Astronomy & Space

2007-02-10 10:55:03 · 4 answers · asked by kenny w 1 in Chemistry

If someone says that a negative acceleration always means that the moving object is decelerating. is this statement true and why?

2007-02-10 10:53:42 · 6 answers · asked by Anonymous in Physics