Science & Mathematics - 21 November 2007

This is for the purpose of repelling harmful energy in the microwave frequencies. Diamond? Graphite?

2007-11-21 23:59:45 · 3 answers · asked by illunatic 2 in Chemistry

i have been off school all week with illness and my chemistry teacher has set this and says that it is completely research based, but i cant find anywhere that will help! the question is 'copper has two oxides, Cu2O and CuO.
copper carbonate, CuCO3 decomposes on heating to form one of these oxides and an equation can be written for each possible reaction:
equaton 1: 2CuCO3(s) ---> Cu2O(s) +2CO2(g) + 1/2O2(g)
2: CuC03(s) ---> CuO(s) + CO2(g)
using ideas learnt about mole, plan and desgn an experiment to measure a volume of gas that will prove with of the two equations is correct' and i have to include equipment needed, quantities of any reagents used, any special sets of conditions required for a particular procedure, and a detailed method which provides full instructions and any precautions.

my first thought was to put the copper carbonate in a conical flask heat it untill gas is given off then displace water in a conical flask to collect it? does that sound right?

2007-11-21 23:51:38 · 4 answers · asked by topher 2 in Chemistry

2007-11-21 23:46:16 · 3 answers · asked by Oh! Crud 3 in Earth Sciences & Geology

2 equations are possible......

2007-11-21 23:42:52 · 5 answers · asked by jon g 2 in Mathematics

2007-11-21 23:39:51 · 9 answers · asked by cleome33408 2 in Astronomy & Space

2007-11-21 23:39:43 · 2 answers · asked by jessica alba fan 1 in Chemistry

2007-11-21 23:29:42 · 4 answers · asked by babybluebog 2 in Zoology

I know it's mostly used in battery applications as a solid, but since it's a downshift on the periodic table compoundwise, ie, Li2 is right under H2 and S is right under O, it seems like the fluid should be waterlike.

Or do compounds not work that way?

2007-11-21 23:23:35 · 1 answers · asked by John F 3 in Chemistry

2007-11-21 23:21:22 · 9 answers · asked by Anonymous in Astronomy & Space

Just bought the Orion but then I saw the one in Costco.

2007-11-21 23:18:42 · 8 answers · asked by krumenager 3 in Astronomy & Space

2007-11-21 23:00:41 · 8 answers · asked by Anonymous in Weather

LOL; As you can see our ungrateful kids have crάpped the whole math category to frustrating boredom! As a change I propose a bit more interesting stuff.
1) this problem was posted 2 weeks ago
http://answers.yahoo.com/question/index;_ylt=AnlJEhvRg1XOB4qLEB5R76jsy6IX;_ylv=3?qid=20071105142649AAumw5p
I wonder who can do it besides Scythian;
evaluate ∫dx sin(x*2007^207) /sin(x) {x=0 until pi};
2) here I shall not mention the source as it contains solution;
evaluate ∫dx (cos x)^2 /(1+ exp(sinx)) {for x from –pi/2 to +pi/2};

2007-11-21 22:53:05 · 2 answers · asked by Anonymous in Mathematics

this is for school work , please tell me your reasons for and against for both animal testing and human testing

2007-11-21 22:51:16 · 11 answers · asked by Anonymous in Medicine

I am a beginner to vedic astrology. I am just about finished with a book called "Beneath a Vedic Sky" by William R. Levacy. I feel I have a sufficient basic understanding to begin practicing, but I am not certain which software I should use. The author of this book uses Lahiri's ayanamsa so I would prefer software using this as well.

The book includes software "Gorovani Jyotish", but while it allows me to view a number of sample charts and many other features, I would have to play for the full version that allows me to create a chart. Does anyone know if I should just buy this full version or is there a better one I should use?

2007-11-21 22:47:16 · 4 answers · asked by illunatic 2 in Other - Alternative

2007-11-21 22:41:27 · 1 answers · asked by Margeaux E 1 in Chemistry

Explain the common phrase in electrical safety: It’s not voltage that kills, it’s current

2007-11-21 22:39:19 · 5 answers · asked by sunday 1 in Physics

what is the ampere of 1 1.5V AA battery

2007-11-21 22:38:04 · 6 answers · asked by dennis j 1 in Engineering

A and B are two loran stations located at (-500,0) and (500,0), respectively. A ship's receiver detects radio signals sent simultaneously from the two stations and indicates that the ship is 600 miles closer to A than to B. Similarly, it is found that the ship is 100 miles closer to C, at (0, 1300), than to D, at (0,-1300). Where is the ship (point)?

2007-11-21 22:37:22 · 1 answers · asked by monogrith7 2 in Mathematics

We say some elements more reactive than other. Is the reactivity of an element is independent of the reagent or substant it is interacting? I reasonably suppose it is not. So the question arises is there any standard substance which is used to test the reactivity of a given element or species (ions, molecules etc) or any arbitrarily attributed condition .. Or simply the term reativity is not precise (a rough one...)?

2007-11-21 22:31:30 · 2 answers · asked by Anonymous in Chemistry

How to integrate that?
Thank you

2007-11-21 22:30:01 · 2 answers · asked by Anonymous in Mathematics

In all documentaries and movies I watch with space ships, they always release rockets at some points in space. Do the ships pick the rockets on their way back to earth or they are simply diposed of in outer space?

2007-11-21 22:25:57 · 13 answers · asked by Sheng Lee 2 in Astronomy & Space

A comet follows a hyperbolic orbit about the sun, reaching its closest point to the sun at a vertex of 43 million miles. When the line joining the sun and the comet is perpendicular to the transverse axis of the hyperbola, the comet is 137 million miles from the sun. Give an equation for the comet's orbit if the axes are placed with the x-axis on the transverse axis and the origin at the center. Where is the sun (point)?

2007-11-21 22:18:48 · 1 answers · asked by monogrith7 2 in Mathematics

1) y=logx-2logx

2007-11-21 22:09:29 · 5 answers · asked by Jackline W 1 in Mathematics

What I mean is, what does the Tesla unit mean, and what are it's implications as far as the energy involved in what it is describing?

2007-11-21 22:08:29 · 2 answers · asked by Anonymous in Physics

Give their contribution to Science.

2007-11-21 22:05:06 · 6 answers · asked by Anonymous in Medicine

The molecular weight of hemoglobin is 65,000 g/ml. Hemoglobin contains 0.35% Fe by mass. How many iron atoms are in hemoglobin?

2007-11-21 22:00:26 · 1 answers · asked by beatrix 1 in Chemistry

When observing any object/thing within the Universe one can conclude certain facts. Irregardless of whether the object/thing is familiar to the observer or not, these certain facts are still conclusive by the direct sensation and rational thought. These conclusive facts are that the object/thing occupies a certain amount of space/volume/dimension and a certain amount of mass. This is evidently observed in every object/thing within the Universe, even if it is a newly discovered substance or element.
By using the rational thought process one is able to sense that the certain amount of mass and space occupied by an object/thing deems it to be limited. Due to the mass and space being only a certain amount, it is also therefore limited to that amount. For example if we were to observe a rock occupying 5cm3 and weighing 5g, this rock would be occupying a certain amount of mass and space i.e. 5 cm3 and 5g. It is thus conclusive that the rock is limited because it is only 5 cm3 and 5g.

2007-11-21 21:57:51 · 17 answers · asked by rockstar 1 in Physics

THE GASES ARE : HYDROGEN , HELIUM , NITROGEN AND OXYGEN.

2007-11-21 21:26:17 · 3 answers · asked by Anonymous in Other - Science

2007-11-21 21:26:08 · 10 answers · asked by ? 4 in Biology

Alexander wants to know exactly how many bars to pack in his backpack for the journey. To provide a margin of safety, he assumes that he will need as much energy for the return trip as for the uphill climb. How many bars should Alexander pack?


Alexander, who weighs 201 lbs., decides to climb Mt. Krumpett, which is 5220 m high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100- g bar contains 10 g of fat, 40 g of protein, and 50 g of carbohydrates.

I got a really high number around...2484042... and thats not even logical.

I first calculated the energy to climb the mountain which i found to be 4.67 *10^6 Joules.

I then began to calculate the energy in each nutrition bar...450 calories are in 1 nutrition bar. I then used a conversion factor to convert calories to Calorie... however its not converting right... I believe there are 1000calories in 1 Calorie... I then used another conversion factor 4.184 J in 1 Calorie.. im lost!

2007-11-21 21:24:25 · 2 answers · asked by hobiesailor07 1 in Chemistry