Science & Mathematics - 13 October 2006

Is solid state cooler heater the same device as peltier? Which is use for temperature change in potrable warmers/coolers? Can this technology be employed in a portable air condition unit? If so how does it work? The application and use for this solid state device.

2006-10-13 08:50:45 · 2 answers · asked by michelle-ann whyte 1 in Engineering

What is the standard enthalpy of formation of solid SrCO3, given the following:
2Sr(s) + O2(g) --> 2SrO(s) H = -1184 kJ
SrO(s) + CO2(g) --> SrCO3(s) H = -234 kJ
C(graphite) + O2(g) --> CO2(g) H = -394 kJ

2006-10-13 08:50:03 · 2 answers · asked by Anonymous in Chemistry

Calculate DH° for the reaction C4H4(g) + 2H2(g) C4H8(g), using the following data:

DH°combustion for C4H4(g) = -2341 kJ/mol

DH°combustion for H2(g) = -286 kJ/mol

DH°combustion for C4H8(g) = -2755 kJ/mol

2006-10-13 08:47:08 · 1 answers · asked by jasmine m 1 in Chemistry

CH4 + 4Cl2(g) CCl4(g) + 4HCl(g), DH = -434 kJ

Based on the above reaction, what energy change occurs when 1.2 moles of methane reacts?

2006-10-13 08:46:47 · 6 answers · asked by jasmine m 1 in Chemistry

Eris is slightly larger than Kuiper Belt Object Pluto. Any chance of becaming a planet?

2006-10-13 08:45:26 · 6 answers · asked by the.night.stalker1 1 in Astronomy & Space

2006-10-13 08:44:56 · 4 answers · asked by The Cheminator 5 in Chemistry

i couldnt find any info elsewer so came up to yahoo answers please someone ans me .
i need it urgently
hope u support
thanxxxxx ppl

2006-10-13 08:43:09 · 4 answers · asked by nikita 1 in Astronomy & Space

2006-10-13 08:36:33 · 7 answers · asked by ebola4dollars 1 in Physics

2006-10-13 08:36:08 · 3 answers · asked by lord illidan 1 in Biology

2006-10-13 08:32:59 · 2 answers · asked by Anonymous in Astronomy & Space

For instance, why does a towel soak up water (i.e. 'suck water into places where air previously was) much more quickly than it dries (i.e. sucks air into places where water used to be)? It only takes an instant for something to get wet, but a long time to get dry.

Is this a common for other liquids and other porous solids - what about if you poured mercury onto a slice of bread? What if you poured rubbing alcohol onto a clay pot? Does this situation still hold true? Does temperature have anything to do with it? What about molten lead and a slab of very hot (but not molten) granite?

Just curious! Thanks!!!

2006-10-13 08:31:50 · 4 answers · asked by colin_21 2 in Chemistry

as i cant find any information pls help me out with latest space technology . i have a project to be done . plz guide me to sum link or sum info arnd 4 - 5 pages

2006-10-13 08:30:38 · 3 answers · asked by nikita s 2 in Astronomy & Space

I have determine two different functions expermientally and I want to know how close are they related.

2006-10-13 08:29:02 · 1 answers · asked by A.DOT 1 in Mathematics

Will the world really have time machine?
Who invented yes? What is the invention?

2006-10-13 08:27:22 · 5 answers · asked by China Hot Cow 1 in Physics

2006-10-13 08:24:13 · 2 answers · asked by Esfandiar H 1 in Physics

I need to write balanced net ionic equations for the following reactions:

a) reaction of iodate with iodide
b) reaction of thiosulfate with triiodide
c) reaction of ascorbic acid with triiodide

iodate = IO3-
iodide = I-
thiosulfate = S2O3-
triiodide = I3-
ascorbic acid = C6H8O6

2006-10-13 08:23:25 · 1 answers · asked by swejedi7 1 in Chemistry

At the Earth's equator a person would have to run 1,037 miles/hour to keep up with the Sun. Obviously impossible

2006-10-13 08:22:03 · 5 answers · asked by u_ndupu 1 in Astronomy & Space

2006-10-13 08:20:57 · 8 answers · asked by Jon M 3 in Engineering

1. f(x) = ± square root of x

2. g(x) =9/3x−4

2006-10-13 08:20:11 · 6 answers · asked by Anonymous in Mathematics

I've heard that if we could travel at the speed of light, we could travel many years in the future too. Is this true?

2006-10-13 08:19:49 · 15 answers · asked by Anonymous in Astronomy & Space

Follow this path:

1) Take the number 13 and square it
2) Subtract 100
3) Enjoy!

2006-10-13 08:16:11 · 2 answers · asked by Anonymous in Mathematics

2006-10-13 08:15:58 · 4 answers · asked by Sujica 1 in Zoology

is it possible,and if it is can we do it between diffrent species.

2006-10-13 08:15:46 · 13 answers · asked by ink 2 in Medicine

Prove that the sum of two consecutive multiples of 5 is always an odd number. Please give full workings, thanks!

2006-10-13 08:15:12 · 12 answers · asked by Anonymous in Mathematics

2006-10-13 08:14:25 · 21 answers · asked by Anonymous in Mathematics

Prove that the product of two consecutive multiples of 5 is always an even number.

2006-10-13 08:13:43 · 5 answers · asked by Anonymous in Mathematics

Golden Cat,Leopard,Lions,Rhino's and the Drill or black and white Baboon.

2006-10-13 08:12:43 · 2 answers · asked by Michael V 4 in Zoology

2006-10-13 08:12:26 · 6 answers · asked by Anonymous in Biology

Prove that the sum of two consecutive multiples of 5 is always an odd number

2006-10-13 08:12:09 · 9 answers · asked by Anonymous in Mathematics

and what exactly is an organic compound? my science teacher explained many times and i am still confused.what is the function of an organic compound? what is the function of that specific organic compound?

2006-10-13 08:10:35 · 16 answers · asked by noseyroseyposey0 2 in Chemistry