Chemistry - June 2007

A synthesis reaction between magnesium (Mg) and oxygen (O2) might produce:
a) Mg2
b) O4
c)MgO
d)MgCO2

2007-06-04 11:18:47 · 5 answers · asked by Anonymous

help me to my study my personal research pls.science people' i give 10 pts. to the right one'''what kind of metal is suitable for heat collectors and is there an available heat converter that converts heat to electricity an apparatus, not solar''i mean how much electricity can a metal fork re-converted by burning a piece of metal do i have to use to kinds of fork or 2 fork to distinguish positive and negative,thanks science people i hope you can help me with this experiments of mine remember my success is your sucess"my fellow countrymen,and them the world i hope this will be a sucess'' thanks''

2007-06-04 11:13:39 · 3 answers · asked by Anonymous

how many liters of oxygen are required to react completely with 3.6 liters of hydrogeen to form water??
2H2 + O2 --> 2H2O

please explain how you get the answer!

<3

2007-06-04 10:55:00 · 1 answers · asked by lalagurl94 1

HF reacts with NaOH:
HF + OH- <--> H20 + F-
a. calculate the number of moles of HF remaining
b. calculate the molar concentration of F- in the solution
c. calculate the pH of the solution

please help!! thanks!

2007-06-04 10:54:36 · 2 answers · asked by Nicole S 1

1. Excess nitric acid is added to solid calcium carbonate

2. a solution containing silver (I) ion (an oxidizing agent) is mixed with a solution containing iron(II) ion ( a reducing agent)

what would the formulas be??? thanks!!

2007-06-04 10:44:14 · 2 answers · asked by Nicole S 1

When electrons move from the 4th energy level to the 2nd energy level, they emit visible light. Explain why the light emitted when an electron makes this move in a sodium atom is a different color than the light emitted by an electron moving from the 4th to 2nd level of a hydrogen atom.

2007-06-04 10:41:11 · 1 answers · asked by wongtongsoup22 2

i also need to know if its flammable, combustible, and supports burning, thanks!

2007-06-04 10:21:22 · 4 answers · asked by ilovemelon93 2

2007-06-04 10:05:09 · 12 answers · asked by amandakelly94 2

I need to know the symbols, i pretty much do already. But i need to know the atomic number, and i know that that is the same as the protons and electrons. But, how do i also memorize the atomic mass and number of neutrons?

2007-06-04 09:53:27 · 10 answers · asked by rsoxfan243433 2

My pieces are quite large an no aluminum pan is deep enough to hold enoguh water to cover them. A silver chamgne ice bucket is one of them.

2007-06-04 09:46:25 · 2 answers · asked by lapeste71 1

T or F- The properties of the elements in a period are chemically very similar

T or F - Only relatively small amount of energy is required to move an electron

T or F - Moving from element to element on period two, an additional electron in the same energy level is added to each atom.
T or F - The reactivity of the metal elements generally increases as you move left to right across the periodic table.

2007-06-04 09:29:10 · 3 answers · asked by Anonymous

26. Which of the following will have the highest rate of solubility?
a sugar cube in boiling water
a sugar cube in room temperature water
a sugar cube in refrigerated water

27. Which of the following will have the highest rate of solubility? granulated salt in water granulated salt in benzene (benzene is a non polar liquid)
granulated salt in gasoline

28. Which of the following will have the highest rate of solubility?
a sugar cube in water
a block of salt in water
a scoop of lard in water

29. Which of the following will have the highest rate of solubility?
granulated sugar in warm water
a sugar cube in warm water
granulated sugar in cool water

30. Which of the following will have the lowest rate of solubility?
stirred lard in water
stirred salt in water
unstirred salt in water


please tell me how this is done....i know solubility is the rate of which they dissolve but how do i know which one dissolves the fastest?

2007-06-04 09:24:35 · 3 answers · asked by qdark 3

Element-Appearance- Atomic Mass- Conducts electricty

Nitrogen-Inivisible Gas- 14.0- No
Argon- Invisible Gas- 39.9- No

Would you expec elements Nitrogen and Argon to have similar chemical properties given only this information?

2007-06-04 09:22:32 · 2 answers · asked by Anonymous

A student determines the percent transmittance of a solution of Red 3 at 600 nm at concentrations as follows

Concentration is 8.0 mg/L and Transmittance is 29.6, How do you find the absorbance?

2007-06-04 08:53:16 · 3 answers · asked by Christie 1

2007-06-04 08:40:15 · 4 answers · asked by khadija 1

47Ca+Sc+?, 235U+4He +?, ?+11B+0-1e, 0-1e+?=40Ar

2007-06-04 08:31:56 · 1 answers · asked by mommy Ty 3

Anyone know if Polypropylene will melt or have any ill effects when submerged into a liquid of a chemical called Mercaptan?

Any info will be helpful...thank you.

2007-06-04 08:04:48 · 2 answers · asked by bpark73 1

2007-06-04 07:46:12 · 10 answers · asked by ANNIE W 1

2007-06-04 07:45:58 · 2 answers · asked by atljasmine4 1

ch3ch2ch2ch2ch2ch2ch2ch3

2007-06-04 07:44:17 · 3 answers · asked by atljasmine4 1

Does anybody have any info about solutions?solute?solvent?Its for my chemistry project that is due

2007-06-04 07:36:19 · 3 answers · asked by vickyz1990 1

2007-06-04 07:14:29 · 12 answers · asked by atljasmine4 1

2007-06-04 07:12:34 · 1 answers · asked by janeeyre444 1

Hi,
I was wondering why - is it less density or something?
10 points for best answer!

2007-06-04 07:11:38 · 3 answers · asked by Anonymous

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of iodine trichloride, ICl3.

a.The e--pair geometry is trigonal-planar, the molecular geometry is trigonal-planar.

b.The e--pair geometry is tetrahedral, the molecular geometry is trigonal-pyramidal.

c.The e--pair geometry is tetrahedral, the molecular geometry is trigonal-planar.

d.The e--pair geometry is trigonal-bipyramidal, the molecular geometry is T-shaped.

e.The e--pair geometry is trigonal-bipyramidal, the molecular geometry is trigonal-planar.

2007-06-04 07:11:32 · 4 answers · asked by Anonymous

Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of the nitrite ion, NO2-.

a.The electron-pair geometry is linear, the molecular geometry is linear.

b.The electron-pair geometry is trigonal-planar, the molecular geometry is bent.

c.The electron-pair geometry is trigonal-planar, the molecular geometry is linear.

d.The electron-pair geometry is tetrahedral, the molecular geometry is bent.

e.The electron-pair geometry is tetrahedral, the molecular geometry is linear.

2007-06-04 07:10:41 · 2 answers · asked by Anonymous

Which is a radical?
N2O,Oc!--, ClO2?

2007-06-04 07:09:28 · 1 answers · asked by Anonymous

and explain why these deposits usually relative safe
and low cost to extract from Earth.

2007-06-04 07:01:32 · 1 answers · asked by zhenichka07 1

I have two methods, powder and liquid. My problem is i need to describe them both eg. why powder, which foods and how? Any idea please!! Exam tomorrow!!

2007-06-04 06:32:13 · 1 answers · asked by charli_noe 1

for my chemistry class.. need info asap we are making bowls out of old records and i need to find out how this is related to science

2007-06-04 04:26:15 · 3 answers · asked by ebeth 2