Chemistry - June 2007

2007-06-25 04:10:55 · 5 answers · asked by pinktart2003 3

2007-06-25 04:07:46 · 3 answers · asked by swathi s 1

I've search all over the internet already, but I still can't find it, so Yahoo Answer is my last resort, so please help! A Tirril Burner is a Laboratory apparatus, it's also somehow the same with the Bunsen Burner, so please guys, HELP!

2007-06-25 04:03:52 · 1 answers · asked by Light 3

you know, the process extracting iron from iron ore using haematite, coke and limestone. They are put into the top of the blast furnace and hot air is blown in at the bottom.

The question is..

The waste gases leaving the furnace are mainly...
A.. Carbon dioxide and nitrogen
B.. Carbon dioxide and oxygen
C.. Carbon monoxide and Carbon dioxide
D.. Carbon monoxide and nitrogen

In the book, it says the answer is A.
I think the answer is B. is the answer in the book correct. why?

2007-06-25 03:54:16 · 10 answers · asked by Anonymous

Dihydrogen monoxide is colorless, odorless, tasteless, and kills uncounted thousands of people every year. Most of these deaths are caused by accidental inhalation of DHMO, but the dangers of dihydrogen monoxide do not end there. Prolonged exposure to its solid form causes severe tissue damage. Symptoms of DHMO ingestion can include excessive sweating and urination, and possibly a bloated feeling, nausea, vomiting and body electrolyte imbalance. For those who have become dependent, DHMO withdrawal means certain death.

Dihydrogen monoxide:

* is also known as hydroxyl acid, and is the major component of acid rain.
* contributes to the "greenhouse effect."
* may cause severe burns.
* contributes to the erosion of our natural landscape.
* accelerates corrosion and rusting of many metals.
* may cause electrical failures and decreased effectiveness of automobile brakes.
* has been found in excised tumors of terminal cancer patients.

2007-06-25 03:41:24 · 8 answers · asked by Anonymous

pls. answer,....now na..

2007-06-25 03:36:57 · 1 answers · asked by angelacute_girl 1

Thanks.

2007-06-25 03:27:02 · 2 answers · asked by Anonymous

2007-06-25 02:24:40 · 2 answers · asked by venkimsu 1

How many Joules of energy are required to raise the temperature of 200 grams water from 20 degreees celsius to 70 degrees celsius?

2007-06-25 01:53:06 · 4 answers · asked by Gillbates 2

A 500 g Iron bar at 212 degrees celsius is placed in 2 liters of water at 24.0 degrees celsius. What will be the change in temparature of the water?(Assume no heat is lost to the surrounding) ( Specific heat of Fe = 0.493 J/g Degrees Celsius)

2007-06-25 01:34:51 · 2 answers · asked by Gillbates 2

How many Joules of energy are required to raise the temparature from 20 degrees celsius to 70 degrees celsius?

2007-06-25 01:31:57 · 2 answers · asked by Gillbates 2

2007-06-24 21:59:11 · 4 answers · asked by Anonymous

(I need more info than "because it is more dense", maybe something to do with molecular structure etc...)

2007-06-24 21:30:20 · 9 answers · asked by nandayo 1

Derive the Henderson-Hasselbalch equation for a solution of a weak acid, HA, answer its salt NaA...

Please help anyone? :(

2007-06-24 20:58:43 · 0 answers · asked by Jehzeel 3

2007-06-24 20:52:15 · 3 answers · asked by poonam 1

2007-06-24 20:47:38 · 6 answers · asked by poonam 1

2007-06-24 16:20:38 · 13 answers · asked by Sylvia Wang 1

The concept of using extrapolation to zero volume as a means of determining absolute zero has a flaw. Which of the following do you most suspect of being the flaw?

a) Volume-temperature graphs are not straight lines
b) The volume of a substance at absolute zero will not be zero
c) You can't get enough data point before the gas liquefies.
d) At very high temperatures, the gas forms a plasma.

As you do the experiments with pressure (p) and temperature (T), you are expecting the graphs to be straight lines with pressure increasing when temperature increases. What is the meaning of the point where the straight line crosses the y-axis?

a) absolute zero
b) boiling point
c) melting point
d) pressure at boiling point
e) pressure at 0°C

2007-06-24 15:23:41 · 4 answers · asked by sillysalamander101 2

Can someone explain the chemical property of a burning candle? What reacts with what?

Thanks.

2007-06-24 13:55:06 · 3 answers · asked by ailee 2

2007-06-24 13:53:06 · 2 answers · asked by Anonymous

For chemistry, we did this lab and did various things to a candle.
When we put aluminum foil around a candle, the flame got smaller and then bigger and then it died out.

I would like to know what happened to it chemically.

Other thing was that we put a flask over a lighted candle for a few minutes, then after that put limewater into the flask and mixed it. The limewater turned from clear to a murky grey.

I would also like to know what happened chemically.

Thanks.

2007-06-24 13:48:29 · 2 answers · asked by ailee 2

2007-06-24 13:44:41 · 2 answers · asked by bob C 1

Also, it is possible for every element to reach plasma phase or is just a few elemts that are able to reach this phase?

2007-06-24 12:58:27 · 3 answers · asked by Anonymous

Please explain.

2007-06-24 12:55:35 · 5 answers · asked by sillysalamander101 2

Why is it on CSI they use phenolphthalein to test for blood at crime scenes? That makes 0 sense to me because any basic solution anywhere would appear to be blood. At first I thought they were using something else, but I've heard them say phenolphthalein twice on the show. I thought to do a check for blood you would have to have something that show up with Iron from the hemoglobin.

2007-06-24 12:50:02 · 6 answers · asked by smilam 5

Any information where i can find the procedure about Bioplastics for my chemistry thesis...Thanks A LoT !!!

2007-06-24 12:42:37 · 2 answers · asked by chelzy y 1

2007-06-24 12:38:42 · 2 answers · asked by Anonymous

2007-06-24 12:33:52 · 5 answers · asked by Kerri L B 1

What risk does it pose?

2007-06-24 12:30:37 · 3 answers · asked by Anonymous

A common demonstration of heat uses a large can. The large can with a screw on top has a small amount of water in it. The can is heated with the top off, and the water begins to boil. As soon as the can is removed from the heat, the cap is put on, sealing off the contents of the can. Choose which scenario you think will occur from the list below.

a) Water vapor gas will stay as vapor because sealing the container keeps the temperature constant

b) As the can cools down the water vapor turns to liquid, lowering the pressure which crushes the can in on itself.

c) As the can cools down the water vapor turns to liquid, raising the pressure which makes the can explode

d) As the can cools down the water vapor turns to liquid, and ice forms on the outside of the can to compensate for this effect.

2007-06-24 12:30:00 · 3 answers · asked by sillysalamander101 2