Chemistry - October 2007

They have 2 different charges...how would i write it like that?

Ex: Ca(C2H3O2)2 +2, -1

2007-10-27 07:11:10 · 1 answers · asked by Amy 2

how do the physical and chemical properties of the elements change?

2007-10-27 06:26:58 · 2 answers · asked by LeylaWayla. 1

2007-10-27 06:15:04 · 24 answers · asked by chatman6969692003 1

2007-10-27 03:59:35 · 6 answers · asked by Ariel F 1

what are the relationship between c2h2 and c6h6, acetylcholine and benzene, are they the same or different???

2007-10-27 03:56:34 · 1 answers · asked by dhana 1

Carbon and hydrogen are present

2007-10-27 03:27:56 · 1 answers · asked by sathi 2

1 oxygen
2 carbon
3 hydrogen
4 chlorine

2007-10-27 01:48:49 · 8 answers · asked by tia 3

OK, I'm having a LOT of difficulty finding ANY information on how styrene is used in the production of polystyrene, ABS and UPR. Do you know any good sites (preferably with chemical equations included) or do you have any tips for me to help with my research?

2007-10-26 22:09:38 · 5 answers · asked by Anonymous

It seems that balancing a chemical equation is a guess work, where one is supposed to pick out the necessary set of whole numbers. If this is the case, the process of balancing an equation would become rather difficult if the chemical formulas get more complex. I was wondering if there exists a more efficient way? Are there any algebraic formulas for doing that?

2007-10-26 19:02:51 · 5 answers · asked by guyava99 2

I am 100% positive this is so and I'm quite sure it's something that's being released from my lungs and/or stomach. I am so clueless as to what this could be...I partly wonder if it could be from an excess of hydrochloric acid that is being released in small doses or if I'm releasing low emission of sulfuric acid somehow. Sometimes I can even feel a slight burning or tingling in my nose when I breath out.

Please, please offer me any kind of insight you have. I'm depeserate for an answer to this.

2007-10-26 18:40:07 · 2 answers · asked by __ 3

2007-10-26 18:20:55 · 3 answers · asked by Anonymous

Rb or Co, and how do you know?

Thanks in advance.

2007-10-26 18:04:15 · 11 answers · asked by Anonymous

2007-10-26 15:19:16 · 1 answers · asked by Gideon 1

hydrogen bonds are very important in which of the following molecules: proteins, sugars, fats.
polar molecules result when: there is an equal/unequal sharing of electrons, ot there are 4 or more atoms involved.
how many carbon atoms are fond in sucrose?

2007-10-26 15:02:31 · 1 answers · asked by Anonymous

How can enzymes work both ways???

2007-10-26 15:01:27 · 1 answers · asked by Curious 1

a. it has a negative electrical charge
b. it has a positive electrical charge
c. it has no electrical charge
d. the electrical charge on the proton baances the electrical charge of the neutron

2007-10-26 14:43:56 · 2 answers · asked by jennaluv6969 1

Something for Work so I can pass to be manager and the question is above which i just can't work it out? Can anyone help email me fpums.ftkk@hotmail.com (my new email )

Thanks

2007-10-26 14:37:41 · 1 answers · asked by Anonymous

2007-10-26 13:47:13 · 1 answers · asked by Anonymous

This is for a lab I did in my chemistry class where we heated hydrates like Copper Sulfate and Magnesium Sulfate. I found out the amount of joules used in the hydration process for them, but don't know how to convert them to "energy of hydration per mole". 217.4 joules was thr amount for Copper Sulfate.

2007-10-26 13:45:32 · 3 answers · asked by Kevin S 1

i have been asked by my teacher to write down the stages of how to make a cup of tea starting from tea leaves ending with a cup of tea, i know it sounds funny, but its part of my HE study hahah, can any1 help me plzzzzzzzzzz

2007-10-26 13:37:14 · 8 answers · asked by emely A 1

I missed this day in class when my teacher went over the Kb and Ka values. How would I calculate the molar concentration of this question? Do I need an ICE chart and what values would I put where?


Calculate the molar concentration of OH - ions in an 1.32 M solution of hypobromite ion, BrO- (Kb = 4.0 10-6).

2007-10-26 09:30:56 · 2 answers · asked by Anonymous

The air in a jar of home-canned green beans is heated to the boiling point of
water at 100oC and the jar is sealed at that temperature. Assume that the
pressure is 1.00 atm when the jar is sealed. What will be the pressure in the
jar when it is cooled to room temperature at 20.0oC?

2007-10-26 09:01:46 · 2 answers · asked by Anonymous

1 decreases
2 increases
3 stays the same
4 none of these

2007-10-26 08:40:30 · 3 answers · asked by tia 3

Please explain how to do this problem.

2007-10-26 08:22:01 · 3 answers · asked by lovin Chem right now 1

A sample of a hydrocarbon is combusted completely in oxygen gas to produce 21.83g of carbondioxide, 4.47g of water(in gaseous form) and 311kJ of heat. (a) what is the mass of the hydrocarbon sample that was combusted? (b)what is the empirical formula of the hydrocarbon? (c) whats the value of delta H per empirical formula unit of the hydrocarbon?

2007-10-26 08:21:14 · 1 answers · asked by peter 2

1) CH4
2) C12H26
3) C16H34
4) C2H6
5) C8H18

2007-10-26 07:30:35 · 8 answers · asked by cloud851 5

How much heat in kJ is evoleved when 5.00 grams of Aluminum reacts with 25.0 grams of Iron (III) Orxide?

Al (s) + Fe2O3 (s) --> Fe (s) + Al2O3 (s) +851.5 kJ

2007-10-26 07:20:45 · 2 answers · asked by kay 2

I need help on this its for chem!!!

2007-10-26 07:16:14 · 3 answers · asked by Gio R 1

If two or more amino acids are possible from a titration, describe another experiment from which the specific acid might be identified

2007-10-26 07:01:38 · 2 answers · asked by Rowdy and Rooty 1

Which has greater bond lengths: NO2- or NO3-? Explain.

2007-10-26 06:50:51 · 1 answers · asked by tay 3