Chemistry - March 2007

2007-03-23 02:55:02 · 2 answers · asked by psb 1

I know that when you add acid to milk it will curdle but what actually causes the curds to appear?

2007-03-23 02:43:09 · 5 answers · asked by Smiley 2

To what volume must it be compressed to increase the pressure to 385 mm Hg.
Please explain.

2007-03-23 02:41:20 · 2 answers · asked by Heavy Metal 3

2007-03-23 02:28:02 · 10 answers · asked by craig 1

pls they shud hav all details and of high skool level ok?sum topicss i found -

Do different brands of orange juice contain different levels of vitamin C?
Does Controlled Atmosphere Storage Affect the Malic Acid and Starch Levels in Apples?
Does the PH level of the acid in our stomachs affect the digestion of proteins?
How does the sugar concentration vary in different brands of apple juices?
Make your own PH indicator using vegetables
What is the effect of heat and acids on milk proteins?



BIO.-
Does jet-lag affect the performance of professional athletes?
Does caffeine raise a person's blood pressure?
What does phosphoric acid do to tooth enamel?
its fine if u get information on these topics or any other but the level has to be of high skool and i require the ans. within a week


and pls. remember i need the details
thanks

2007-03-23 01:43:22 · 4 answers · asked by kitty 3

There is huge damage for relatively small amounts of explosive substance, for instance a van full of explosives can flatten an area ten times the size or more. Is this a chemical process or how does this happen?

2007-03-23 01:16:30 · 10 answers · asked by Elle Dee 3

Ideal gas molecules bend and stretch in elastic ways as they collide.
Ideal gas molecules are attracted to each other, and therefore collide repeatedly.
Ideal gas molecules are repelled by each other, and therefore bounce away from each other with great force.
Ideal gas molecules are neither attracted to nor repelled by each other, and therefore do not gain or lose energy as they collide.

2007-03-23 00:55:48 · 4 answers · asked by Heavy Metal 3

or any software that would allow you to create/play with different molecules three dimensionally by adding or subtracting groups etc., particularly heterocyclics.

2007-03-23 00:39:20 · 1 answers · asked by el cabo 2

( In the final solution)

2007-03-23 00:29:17 · 3 answers · asked by Anonymous

2007-03-23 00:24:12 · 2 answers · asked by Anonymous

What is the temperature of the balloon?
We do not have enough information to answer this question.
0.0821 Kelvin
1.73 Kelvin
21.0 Kelvin

2007-03-23 00:03:16 · 1 answers · asked by Heavy Metal 3

What mass of magnesium ions would be available from a packet of epsom salts that contained 375g of hydrated magnesium sulfate?
MgSO4.7H20 <---- the formula of hydrated magnesium sulfate.

2007-03-22 23:55:31 · 4 answers · asked by Anonymous

(Assume all other parameters remain constant.)
The volume increases
The volume decreases
The volume remains unchanged
We need more information to answer this question

2007-03-22 23:50:37 · 5 answers · asked by Heavy Metal 3

I have this question in my lab report. I lear chemistry first year and I have no idea. One thing that I came up that these may be complex or some thing like that....
Explanation will be very apreshiated :)

2007-03-22 22:42:04 · 6 answers · asked by lenok_03 1

I've been searching for a definition but i'm just finding complex answers, could anybosy explain it to me in layman's term???
Thanks in advance

2007-03-22 21:30:39 · 6 answers · asked by strawberry_fairy_6 2

2007-03-22 21:25:22 · 5 answers · asked by Anonymous

Yes or No


In theory, would the volume of a real gas be infinite.
Yes or No

2007-03-22 19:45:49 · 5 answers · asked by Heavy Metal 3

So how many atmospheres is this?

How many pascals is this?

2007-03-22 19:33:22 · 3 answers · asked by Heavy Metal 3

2007-03-22 19:07:44 · 7 answers · asked by Anonymous

Is it true that reheating spinach causes the nitrates in it to be changed into nitrites by bacteria present on nitrate rich foods?
There are loads of conflicting statements on the net. I'm really confused. I've always heard not to reheat it, but i need to know why, if it is true.

"Adults are not affected by nitrates or nitrites because their stomachs produce acids that fight the bacteria that help convert nitrates into nitrites"

Nitrosamines are carcinogenic chemical compounds of the chemical structure R2N-N=O. Nitrosamines are produced from nitrites and amines. Their formation can occur only under certain conditions, including strongly acidic conditions such as that of the human stomach

ARGH....as you can see the more i read into it, the more i am confused. I'd really appreciate if someone could shed some light...

2007-03-22 17:48:16 · 2 answers · asked by rahbonzy 2

slope= -1.10x10^4 K
y-int=33.5
k has units of s^-1
the temperature varies through each experiment, but is not given
based on a ln(k) versus 1/T plot

2007-03-22 17:25:59 · 1 answers · asked by uber420racer 1

besides the different ion charge, any difference in molecular mass and stuff?

2007-03-22 17:25:51 · 4 answers · asked by Lisa L 2

Even though gasoline and natural gas have the same per gram energy content when combusted.

2007-03-22 16:51:08 · 5 answers · asked by Keb W 1

Indicated the coordination number of the metal and the oxidtion number of the metal in each of the following complexes:
Na2[CdCl4]
K2[MoOCl4]
[Co(NH3)4Cl2]Cl
[Ni(CN)5]-3
K3[V(C2O4)3]
[Zn(en)2]Br2

thanks so much!!

2007-03-22 16:46:34 · 2 answers · asked by Anonymous

nitrogen dioxide decomposes to nitrogen monoxide and oxygen:

2NO_2 --> 2NO + O_2 (all in gaseous state)

at what rate will O-2 concentration change? I think the answer is half as fast as NO gas. Correct?

If you increase the temperature of the reaction from 300 degrees Celsius to 400 degrees Celsius, how will this affect the rate of decomposition of NO_2? -- For this one I'm not sure. It seems that it would decompose more quickly, since the molecules will collide more frequently with their increased average kinetic energy. Is this correct? Is there a specific formula to illustrate this?

This is another part of the problem: "Your friend looks at the balanced equation and writes the rate law for the reaction: Rate = k[NO_2]^2 You caution your friend that you can't just look at the overall balanced equation to determine the rate law. How could you determine whether your friend is correct?

? Thanks for the help. 8^?

2007-03-22 16:44:47 · 1 answers · asked by thesekeys 3

The question is:
A side reaction that might occur during this reaction is the production of sulphur dioxide gas. Write an equation to represent the formation of this gas and also the reaction of this gas with water.

2007-03-22 16:43:11 · 3 answers · asked by Anonymous

Doesn't have to be large scale, just to show the concept and how it works. Is there another process that's easier/ safer/ less expensive/ demo kits already exist? What is involved in the cuprammonium process?

Thanks for your patience and thanks to all who answer.

2007-03-22 16:41:44 · 1 answers · asked by cdf-rom 7

2007-03-22 16:23:57 · 3 answers · asked by jimder32 1

Please read details!

I KNOW there are faster, better, easier methods for recovering chemicals, but I’m writing fiction and this is what the story demands.

Please don’t suggest usual techniques of mining, smelting, etc.

We have a crude chromatography column with finely crushed charcoal as the filter material.

We try to separate

1) minerals in river water,
2) minerals that can be dissolved from soil by filtering additional water through it,
3) metals remaining in the ashes after burning plants grown in metal rich soil.

What elements (especially metals) are we likely to be able to recover, in what kind of quantities?

Though we have plenty time (generations) to repeat the process, until useful amounts of metals can be recovered, estimate the time it will require more precisely.

What are the more common industrial uses for the metals or compounds recovered? (Optional)

Thanks for patience, all who answer.

Confused? Ask more details, I'll provide them.

2007-03-22 16:17:28 · 1 answers · asked by cdf-rom 7

What is the partial pressure, in atm, of the O2 gas ?

2007-03-22 16:05:33 · 1 answers · asked by Mike P 1