Chemistry - June 2007

...help!

2007-06-22 14:18:31 · 8 answers · asked by !~LaiLa~! 1

In a fusion reaction, two _______ atoms fuse to produce a helium atom.

2007-06-22 13:46:57 · 5 answers · asked by Anonymous

2007-06-22 13:43:53 · 3 answers · asked by .... 2

2007-06-22 12:53:17 · 1 answers · asked by raly_sagrado 2

As you move from the blue region of the electromagnetic spectrum to the red region of the electromagnetic spectrum, what happens to the wavelengths of the light?

2007-06-22 11:50:32 · 5 answers · asked by Anonymous

A) a ball striking a wall, in which the force of the ball on the wall is equal to the force of the wall on the ball
B) a gas balloon in which the buoyant force is greater than its weight and air resistance
C) a man in a parachute when the air resistance is less than his weight
D) an airplane in horizontal flight when the thrust of the engine is equal to the drag of the air

2007-06-22 11:14:43 · 9 answers · asked by Cara 4

I have something that has an alcohol content of 21%.

Will it freeze if I put it into an ice cube tray, or am I just wasting my time, and my precious drinkies?

2007-06-22 10:09:21 · 15 answers · asked by vanity 2

2007-06-22 09:15:54 · 6 answers · asked by Anonymous

2007-06-22 08:56:13 · 9 answers · asked by bucklady 1

2007-06-22 08:28:08 · 6 answers · asked by erik v 1

What is the oxidation number of chromium in HCrO4?

The correct answer is +7, but I don't understand how to come up with this. I tried adding the charges together, but it wasn't working out for me.

2007-06-22 08:16:54 · 5 answers · asked by JMEB 2

I can't find online if this is a base. If you say it is, please give me a source that says it is, so I can document it. I can't find one. Thanks

2007-06-22 08:15:47 · 5 answers · asked by Anonymous

How many F- ions are present in 2.50 moles of BaF2?

The correct answer is 3.01e24, but I have no clue on how to come up with this answer?

2007-06-22 08:14:36 · 3 answers · asked by JMEB 2

2007-06-22 07:13:49 · 9 answers · asked by saffy 2

What is the mass of 1.94 x 10-3 mol C6H12O6?

.340 g
.456 g
.905 g
22.5 g

2007-06-22 06:41:25 · 3 answers · asked by Anonymous

pleeez i want some information (but quickly please) about the chemistry of the prodrug..(erythromycin prodrug)
its name is dirithromycin (Dynabac®)..
i need informations about :
the mechanism by which this prodrug convert to the parent drug.,the problems that have been solved by making the prodrug of that drug.,and the route of adminstration...
please i need these information very quickly and i'll appreciate it verymuch...please if u know any web site from which i can get these informations ,please tell me......
thank you very much ..

2007-06-22 06:38:31 · 3 answers · asked by reallife 1

A flammable gas that is lighter than air is:
a) oxygen b) chlorine
c) hydrogen d) helium

2007-06-22 06:06:38 · 11 answers · asked by Anonymous

Which of the following is the odd one out (in terms of their pH value)?

lemon juice
citric acid
vinegar or
baking soda?

2007-06-22 06:01:40 · 17 answers · asked by ? 3

Thank

2007-06-22 03:11:53 · 2 answers · asked by Anonymous

2007-06-22 02:57:15 · 2 answers · asked by Kerri L B 1

2007-06-22 02:33:47 · 5 answers · asked by needhelp1811 1

Project I
Study the rates of diffusion of K2Cr2O7 (Potassium) at different temperatures:

At room temperature:
Procedure – Take two glass containers and graduate them. Now place 1 g of crystal of K2Cr2O7 at the bottom of one container and record the level of coloured solution at regular intervals of time as follows:

Time in hr. Level of coloured solution Rate of diffusion=
0.25
0.50
0.75
1.00
Total Time = 1.00 hr
Average rate of diffusion = ________ ml/hr

Repeat the above experiment with hot water say water at 600C

Project II
Study the effect of particle(crystals) size on rate of diffusion of solid in liquid
Procedure – Take 3 different size crystals of KMnO4 of almost same weight in 100 ml water and record the observations as above.
State the scientific reason for your observations

2007-06-22 02:28:05 · 4 answers · asked by sourav 1

Of the following metals, which ions are most easily reduced?
a) Mercury
b) Potassium
c) Iron
d) Aluminum

Also, Which of these ions is most easily reduced?
a) Zn^2+
b)Cu^2+
c)Ni^2+
d)Ca^2+

I still need help with other questions if you want to help add me on msn - GanjaGuroo@hotmail.com

2007-06-22 01:48:56 · 2 answers · asked by Matt S 1

37% hydrochoric acid 2.5L
density=1.18g/l

2007-06-22 01:29:56 · 4 answers · asked by chris82 1

For example....
O2 is oxygen...
H2O is water..

I wanted to kno whether we can form a compound named "C2"

2007-06-21 23:30:08 · 4 answers · asked by Rajat Khurana 1

The tyre is made by heating a mixture of hydrocarbons and sulphur!

2007-06-21 20:26:30 · 1 answers · asked by saffy 2

I have a zn-cu electrochemical cell. Textbooks say that the voltage across this cell should be 1.1V. But when i experiment with the cell i got a lower voltage of 0.9. Why is this so?

2007-06-21 19:50:45 · 4 answers · asked by abcd 1

Quick, easy question for a physical chemist. When a gas is allowed to expand adiabatically and reversably, does the temperature increase or decrease with the drop in pressure? Or does it depend on the nature of the gas?

2007-06-21 14:34:44 · 2 answers · asked by Anonymous

Why do we use benzyl alcohol for lotion?

2007-06-21 14:31:32 · 4 answers · asked by Eden 1

and how dangerous is it when used as a rooting hormone?

2007-06-21 13:56:25 · 2 answers · asked by Anonymous