Science & Mathematics - 3 September 2006

Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure. Its formula can be written as Na2CO3x H2O, where x is the number of moles of H2O per mole of Na2CO3. When a 1.836 g sample of washing soda is heated at 125°C, all the water of hydration is lost, leaving 0.680 g of Na2CO3. What is the value of x?

2006-09-03 15:17:58 · 3 answers · asked by Anonymous in Chemistry

Nicotine, a component of tobacco, is composed of C, H, and N. A 5.775 mg sample of nicotine was combusted, producing 15.666 mg of CO2 and 4.491 mg of H2O. What is the empirical formula for nicotine?

2006-09-03 15:16:56 · 4 answers · asked by Anonymous in Chemistry

Brightest Planet...?
Most Broken Bone...?
Liquid Metel In Thermometers...?

2006-09-03 15:08:48 · 13 answers · asked by kay kay 2 in Earth Sciences & Geology

Of course the terms 'money' and 'publish' may have had completely different meanings in Euclid's time than today's.

So if you know greek history AND history of mathematics, this question is for you.

2006-09-03 15:08:21 · 4 answers · asked by oracle 5 in Mathematics

2006-09-03 15:07:32 · 8 answers · asked by cashmoney28422 1 in Mathematics

We are looking forward for a unified theory. How it will be? Too complex mathematical interpretation so that no one can get it completely or so simple that is so close to nature so that a child can say this is the fact.

2006-09-03 15:07:13 · 4 answers · asked by libranjiss 1 in Physics

Also try: why does the united states use the US customary weights and measurements, why does the united states use the us customary weights and measurements and not the metric system ,

2006-09-03 15:03:31 · 7 answers · asked by Westsail43 2 in Other - Science

Astronomers are saying that they have seen the light from the premature universe!! How it is possible? Our earth and the galaxy system orginated from that explotion. The speed of light is enormous and no body can travel in that speed. If from earth we are seeing the light from the premature universe then it suggest that all the galaxy system travelled at a speed that is unimaginable, since we are seeing the light started from premature universe many many billons of years before. Or else it suggests that the universe have a sort of closed structure and we are seeing the light travelled in the other way around.

2006-09-03 15:02:44 · 10 answers · asked by libranjiss 1 in Astronomy & Space

2006-09-03 15:02:11 · 2 answers · asked by forever <3 1 in Earth Sciences & Geology

the one by my house smelled like ballons

2006-09-03 14:58:44 · 12 answers · asked by Anonymous in Weather

I have some evidence now and even think I have the missing link to the Theory of Regression. I have uncover much that seems to dictate that Monkeys did evolve from humankind 10 to 15 million years ago. Based on all my studies the monkeys are geting smarter and smarter and the humankind is on the brink of extinction. I am trying now to get humankind on the endangered species list.

This Theory is called the Theory of Regression because it is from a humankind point of view.

2006-09-03 14:58:42 · 7 answers · asked by cjkeysjr 6 in Zoology

2006-09-03 14:52:17 · 20 answers · asked by afrprince77 2 in Astronomy & Space

i cant experiment on animals and it has to be less than 3 moths to do

2006-09-03 14:51:36 · 5 answers · asked by Anonymous in Earth Sciences & Geology

they say the universe has no begining and no end i dont belive so everything has a begining and an end i mean think if you had a time machine that could go 100000000000000 years in time in 1 second on a watch i bet youl see a begining sometime and they say there is no life out there but think about it if you go through a ripple a black hole it can take you to anothor time and reality of our world today like say you could see what the world was like if kerry one
the election just by going 3 light years from the middle of the u.s at exacly 5:00 in to a black hole while you going 900.76 mph to get there

2006-09-03 14:51:19 · 8 answers · asked by ziegler910 2 in Astronomy & Space

How does an arrangement with a zinc and brass rods dipped in Na2CO3(aq) restores the shine. What is the purpose of the sodium carbonate.

sry for the looong question..

2006-09-03 14:46:52 · 1 answers · asked by Buzz 1 in Chemistry

Assuming a deceleration of 7.00 m/s estimate the speed of the car just before braking.

I have tried to work this problem but I am not sure I used the correct equation. Thanks!

2006-09-03 14:41:41 · 5 answers · asked by icyblueheart 2 in Physics

2006-09-03 14:34:01 · 4 answers · asked by natasha b 1 in Physics

2006-09-03 14:33:22 · 8 answers · asked by Anonymous in Chemistry

I recently had a conversation with someone who claims their electric bill was lower because they kept all appliances (tv, radio, a/c, lights, etc...) running all day versus turning them off in the morning and then turning them back on in the afternoon/evening. They claimed it costs more money to turn a light on and then off versus keeping it on. I've heard something similar in the past. Is this true or a myth?

2006-09-03 14:30:02 · 7 answers · asked by nkneedeep32 1 in Other - Science

2006-09-03 14:28:47 · 4 answers · asked by mejoe39 2 in Chemistry

If it looked the same, and you could still feel, but it was faster, stronger, and smarter than your organic body.

2006-09-03 14:28:38 · 9 answers · asked by BobtheBuilder 2 in Other - Science

I commented on how these spiders appear in late summer and spin webs in open places where they hadn't been earlier in the year. Spiders that spin webs every night but the webs are gone in the daylight. This guy told me that the spiders eat the webs. I don't believe it.

2006-09-03 14:28:02 · 11 answers · asked by February Rain 4 in Zoology

Describe equipment used on the job as a chemical assistant, identify what type of degrees, skills, course work, or training is required to be a chemical assistant.

2006-09-03 14:26:03 · 2 answers · asked by struggling student 2 in Chemistry

2006-09-03 14:25:12 · 5 answers · asked by Jazmin V 1 in Mathematics

A solution of formic acid is found to have a pH of 2.0. What is the molarity of the solution of formic acid (Ka = 1.78 x 10-4)

H(CHO2) <-> H+ + CHO2-

2006-09-03 14:24:15 · 3 answers · asked by RED MIST! 5 in Chemistry

I know they construct nests in trees but do theyhibernate in these or do they find hollow trees to hibernate on and off through out the winter?

2006-09-03 14:22:51 · 8 answers · asked by John16 5 in Zoology

Doesn't the term 'beginning' already imply the existence of time?

2006-09-03 14:18:34 · 12 answers · asked by thepinm 2 in Physics

subjects is 84. What is the lowest grade?

2006-09-03 14:07:40 · 8 answers · asked by wolfwood 2 in Mathematics

2006-09-03 14:05:44 · 2 answers · asked by Kevin H. 3 in Botany

plz show where you got your info

2006-09-03 14:04:55 · 5 answers · asked by mentallyblond4life 2 in Astronomy & Space