Chemistry - October 2007

2007-10-21 02:26:22 · 6 answers · asked by ravi 2

1. 15:5
2. 14:6
3.14:5
4.16:5
5. 16:4
6. 15:4
7. 14:4
8. 15:6
9 16.6

I chose answer #1, but obviously its wrong. I need your help, btw how did you come up with your answer (ty).

2007-10-21 00:55:03 · 2 answers · asked by xxxladyxxx 1

1. Hydrogen has an extremely low electronegativity.
2. Hydrogen is able to accept or donate electrons, so it is the most versatile atom in the periodic table.
3. Hydrogen can be considered either a metal of nonmetal.
4. The boiling points of NH3, H20, and HF are abnormally high compared with the rest of the hyrides in their respective periods.

2007-10-20 23:55:55 · 2 answers · asked by xxxladyxxx 1

2007-10-20 22:48:56 · 2 answers · asked by Anonymous

Gold,sugar,salt,aluminum,oxygen,chlorine,water,platinum,brass.

2007-10-20 22:01:12 · 18 answers · asked by fayloit 2

if you dont know that one,
how about either one of these:

* 2-propanol + glacial acetic acid + conc. sulfuric acid
* 1-pentanol + (same) + (same)

also,
what is the fuction of the sulfuric acid in these reactions?

By the way, this is Grade 12 Chem!
I hate chemistry........

2007-10-20 20:00:10 · 3 answers · asked by liilee89 1

Calculate the longest wavelength (in m) of the electromagnetic radiation emitted by the hydrogen atom in undergoing a transition from the n = 6 level.

2007-10-20 19:44:39 · 1 answers · asked by Joe C. 1

2007-10-20 18:07:43 · 3 answers · asked by ? 3

2007-10-20 17:14:59 · 1 answers · asked by Imperative 2

The half-life of iodine-131 is approx. 8 day. How much of an original sample will be left after 24 days?
- I dont get how to answer it theres no measurments being used!?

2007-10-20 17:07:24 · 6 answers · asked by siimpli_mi 2

What is the molecular equation for hydrocholric acid (HCI) and NH4OH

2007-10-20 17:03:51 · 2 answers · asked by Tiffany 2

Question 19
Glycine is one of the amino acids that forms proteins. Protein that is not required in the body is broken down in the liver. Unwanted nitrogen is converted to urea and eliminated in the urine.
H2NCH2COOH glycine (H2N)2CO urea
The maximum mass of urea (relative molecular mass = 60) that could be eliminated as a result of the breakdown of 1.00 g of glycine (relative molecular mass = 75) is, in gram,
A. 0.40
B. 0.80
C. 1.00
D. 1.60

2007-10-20 16:52:47 · 1 answers · asked by Robby 1

Hey! I am doing my chemistry mid-term study guide and some questions came up. Please help!!! Thanks
Can you explain it as well so that I know why?

1) Which element would require the least amount of energy to remove an electron from the outer shell (ionization energy)?
2) Which element would have the highest electronegativity?
3) Which element would be the mest reactive metal?
4) Which element would combine with two halogens in an ionic bond?
5) which element would have the smallest atomic radius?
6) which element is the most reactive non-metal?
7) which element has characteristics similar to both metals and non-metals?
8) which element would require the most amount of energy to remove an electron from the outer shell (ionization energy)?
9) which element would have the lowest electronegativity?
10) which element is most likely to be totally un-reactive?

2007-10-20 16:40:09 · 4 answers · asked by july28usa 3

How do you convert liters to moles?

Thanks!

2007-10-20 16:39:30 · 7 answers · asked by db 3

What is the molecular, total, and net Ionic equations for zinc and CuSO4?

2007-10-20 16:32:09 · 1 answers · asked by Tiffany 2

atoms present in the substance.is this method more useful for organic substances or inorganic substances?

2007-10-20 15:12:57 · 2 answers · asked by lisandra 1

When the iron pipes are placed in salt water, they rust at an even greater rate. Explain why iron rusts faster in salt water.

2007-10-20 14:47:19 · 2 answers · asked by Anonymous

and how do you set up the calculation.

2007-10-20 14:34:54 · 1 answers · asked by Anonymous

2-Methylcyclobutanone

3-Cyclopenten-1-ol

2-Cyclopenten-1-ol

2007-10-20 14:28:13 · 2 answers · asked by student217 1

I dont get this. How can centimeters be converted into liters? Is it a trick question? Please help!!

2007-10-20 14:20:52 · 4 answers · asked by Skiier 3

please answer question fully thanks

2007-10-20 14:20:51 · 1 answers · asked by Anonymous

CO(carbonmonoxide) why can't we right it Oc
how do i know which elment hs to be written first
does it depend on the outershell and when do i capatalize the letter

2007-10-20 14:17:06 · 3 answers · asked by what ever ? 2

can anyone plz help me w/ any of these. im not looking for fast, easy answers, i want to see how to solve, so i can apply the same procedure to any similar questions. my textbook doesnt offer any help, and my chem teacher sucks...
also, does anyone know of a site i can go 2 that will help?
thx so much, help is really appreciated! :)

1. How many kilojoules are required to raise the temperature of 4.55 x 10 *2* ml of water from 22.4 C to 300 K?

2. When 8.78 x 10 *2* J of heat are absorbed by 1.25 x 10 *2* grams of silver from 25.0 C to 54. 9 C. What is the specific heat of silver?

3. A copper wire weighing 3.16 g absorbs 42.8 J of heat. If its initial temperature is 22.6 C, what is its final temperaure? The specific heat capacity of copper is 0.385 J/g C.

*2* means "squared"


thanks a lot!

2007-10-20 14:16:20 · 3 answers · asked by Tibs 2

2007-10-20 14:15:54 · 2 answers · asked by Jenny K 1

2007-10-20 14:12:51 · 2 answers · asked by Tamisha L 2

I am learning about acids and bases and the Bronsted-Lowry definition (grade 11)

Everything seemed to make sense until i found how that CO2 becomes an acid in water...
I don't understand how this can be, since acids donate protons to water... but where is the H+ in CO2???

To me it makes sense only that CO2 is a base because then it can accept an H+

Please show me the chemical equation/s of how CO2 reacts with water and how the proton gets transfered.

2007-10-20 14:11:31 · 4 answers · asked by Anonymous

Hi, I did a lab called "spectroscopy-secrets of light". Please help me with this question:

1.) What causes the single elements in the gas phase to produce different colors in a line spectrum?

Thank you!

2007-10-20 14:07:23 · 1 answers · asked by chemmyhead 1

2007-10-20 14:03:23 · 1 answers · asked by Anonymous

Okay you are suppossed to find out what word on the pte and the clue is: I AM A GAS WITH A MASS NUMBER OF 19.

2007-10-20 14:01:43 · 2 answers · asked by Anonymous

2007-10-20 13:44:51 · 3 answers · asked by nana ♥ 2