Chemistry - February 2007

although carbon is tatra valence.

2007-02-25 01:35:12 · 2 answers · asked by shakti s 1

i need to know what form of water would freeze faster cold or hot and if you know then please tell me why because this is a bonus question for my science class so please help me.

2007-02-25 01:28:59 · 2 answers · asked by Ashley 2

The reaction A (aq) B (aq) is first order in [A]. A solution is prepared with [A] = 1.22 M. The following data are obtained as the reaction proceeds:
_____________________________
Time (s) | 0 | 6 | 12 | 18 |
[A] (M) |1.22 | 0.61 | 0.31 | 0.15 |
|
The rate constant for this reaction is __________ s-1.

2007-02-25 01:09:12 · 2 answers · asked by Anonymous

i just want one price.... nice and simple.... to find out whether its cheaper to buy or make....
the malachite im looking for is a chemical...... solid......

2007-02-25 00:50:32 · 2 answers · asked by juz_one_princess 1

between an atom of oxygen, a molecule of oxygen and an ion of oxygen (oxide ion)?

Please help me.

Also,

question 2:
When the calcium atom forms its own ion
a) the mass number is unchanged
b) it gains two electrons
c) it loses two neutrons
d) it achieves the elctron configuration of neon
e) it loses two protons

Multiple choice...choice the ONE correct answer. Thankyou

2007-02-25 00:40:54 · 1 answers · asked by Anonymous

2007-02-25 00:25:35 · 3 answers · asked by fifi 1

2007-02-25 00:23:51 · 3 answers · asked by Apollos 1

2007-02-24 23:46:35 · 1 answers · asked by meann m 1

also give the equation for the reaction of sec-butylchloride with silver nitrate.

2007-02-24 23:43:18 · 2 answers · asked by onyx 2

explain how the test/s could differentiate them.

2007-02-24 23:28:59 · 2 answers · asked by onyx 2

when in fact the electronegativity values of hydrogen and carbon are almost the same/

2007-02-24 23:26:38 · 2 answers · asked by onyx 2

NEED IT DESPERATELY IN THE NEXT HR!! IT IS FOR A CHEM PRACTICAL WRITE UP. CHEERS ^-^
Ozone is 03 right?

2007-02-24 22:59:23 · 1 answers · asked by Carly L 2

2007-02-24 22:21:44 · 3 answers · asked by boffin 1

2007-02-24 21:44:18 · 2 answers · asked by ais 1

solution is titrated, it required 22.80cm³ of 1.325g/dm³ of NaOH. Calculate the original concentration of sulphuric acid. The answer is 0.157mol/dm³. Can anyone show me how to go about doing it?

2007-02-24 21:27:34 · 3 answers · asked by Tata(: 3

Answer plz!

2007-02-24 21:22:08 · 2 answers · asked by Amir 2

What is the meaning of S in 309S ?
What stands for L in 304 L ?
What stands for H in 304 H- on what basis it is divided by 304,309,316 etc.?

2007-02-24 21:15:22 · 2 answers · asked by jayancjaa 1

2007-02-24 20:59:33 · 5 answers · asked by Chelsea16 1

2007-02-24 20:54:04 · 5 answers · asked by Anonymous

2007-02-24 20:39:03 · 4 answers · asked by Anonymous

2007-02-24 20:38:08 · 8 answers · asked by jason j 1

did a titration with NaOh and ethanooic acid to find the concentration of ethanoic acid, now that ive found the concentration of the undiluted acid, how do i find the % mass of the acid?

2007-02-24 20:24:26 · 2 answers · asked by Anonymous

electrolyte?

2007-02-24 20:21:17 · 3 answers · asked by tut_einstein 2

hey guys when did it come apparent that mercury was poisonous? 1800's? thanks :P

2007-02-24 20:07:50 · 4 answers · asked by Anonymous

please help, cant find the answer to the 2nd question

2007-02-24 19:52:21 · 2 answers · asked by Anonymous

3)Sorbitol is a sweet substance found in fruits and berries and sometimes used as sugar substitute. An aquesous solution containing 1g of sorbitol in 100g water has a freezing point of -0.102˚ C. Elemental analysis indicates that Sorbitol is 39.56% C, 7.75% H and 52.7% O. What are the molar mass and the molecular formula of Sorbitol? The Ksubf of water is 1.86˚ C/m.

2007-02-24 19:35:13 · 2 answers · asked by smarterchild_usa 1

i know what it does, but why or how does it cause everything to turn blue-black if it detects starch?

2007-02-24 19:10:57 · 3 answers · asked by what? 7

?

2007-02-24 18:59:54 · 2 answers · asked by Anonymous

2007-02-24 18:55:41 · 2 answers · asked by neel 2

After the products return to STP, how many grams of nitrogen monoxide are present?
NH3(g) + O2(g) -------> NO(g) + H2O(l) [unbalanced]

2007-02-24 18:47:51 · 2 answers · asked by azi 1