Chemistry - August 2007

2007-08-02 02:09:00 · 4 answers · asked by michael m 1

2007-08-02 01:45:07 · 2 answers · asked by Anonymous

2007-08-02 01:40:05 · 2 answers · asked by Anonymous

Please recommend any good additive/catlyst to melt PET in Glycols, like Mono Propylene Glycol,Di ethylene , Mono ethylene glycols etc.

2007-08-02 01:09:14 · 1 answers · asked by Anonymous

Please suggest any methods/additives in Unsaturated Polyester Resins,so that we can get a clear Resin without any yellowishness

2007-08-02 01:03:15 · 1 answers · asked by Anonymous

can someone pls. answer my questions? my midterm exam is about to come and yet i don't have the answers to these questions. i really need help badly!


1. how come the metallic properties of the elements in the periodic table decreases as you go across and increases as you go down?

2. how come the atomic size of the elements in the periodic table decreases as you go across and increases as you go down?

3. how come the ionization energy of the elements in the periodic table increases as you go across and decreases as you go down?

4. how come the electron affinity of the elements in the periodic table increases as you go across and decreases as you go down?

2007-08-02 00:41:01 · 1 answers · asked by rapidgirl 2

can some1 teach me how to separate potassium chloride and also tell me what apparatus i need. thanks

2007-08-01 23:20:02 · 3 answers · asked by infernape 2

2007-08-01 23:05:47 · 1 answers · asked by sweet 1

2007-08-01 22:42:59 · 2 answers · asked by lili 2

2007-08-01 22:10:02 · 13 answers · asked by MA. FLORENCE C 1

2007-08-01 22:07:56 · 7 answers · asked by MA. FLORENCE C 1

2007-08-01 22:01:34 · 1 answers · asked by Ritu 1

In the Neutralisation experiment, the burette in the experiment is always filled with acid, and the alkali is always filled inthe conical flask below the burette. Why do we want to do so?

2007-08-01 21:18:12 · 5 answers · asked by ChongV 1

2007-08-01 21:12:38 · 1 answers · asked by Anonymous

2007-08-01 21:05:45 · 1 answers · asked by Anonymous

2007-08-01 20:56:54 · 3 answers · asked by john ruffy t 1

I was watching a movie and the used a chemical that melted a persons flesh. I was wondering if there is such a chemical.

2007-08-01 19:12:56 · 4 answers · asked by Anonymous

I'm not sure if it's oxygen or not. But if you think its something else, please explain. Thanks!

2007-08-01 19:07:47 · 6 answers · asked by Anonymous

Sources please?

2007-08-01 19:05:43 · 10 answers · asked by Anonymous

Hydroxyl, aldehyde, keto, carboxyl, amino, phosphate, and sulfhydryl? Please provide your sources if possible! Thanks!

2007-08-01 19:02:35 · 1 answers · asked by Anonymous

Eq. wt. of an element is defined as that wt. of element in grams which reacts with 1 part by wt. of H2 or 8 parts by wt. of O2 or 35.5 parts by wt. of Cl.

Can u explain reacts with 1 part by wt. of H2 or 8 parts by wt. of O2 or 35.5 parts by wt. of Cl

2007-08-01 18:38:08 · 2 answers · asked by bullet 2

I know that before the industrial revolution began the Earth's atmosphere held close to 23% oxygen, and that humans start to get dizzy in rooms holding only 15 to 17 % oxygen, but what is the mandatory % of oxygen for humans to breath and remain concious? Also, what are the current oxygen ratios to the Earth's atmosphere at the present date of August 1st, 2007?

2007-08-01 17:59:37 · 2 answers · asked by theo_exploration 1

a. always less than its original mass number.
b. always more than its original mass number.
c. always the same as its original mass number.
d. never less than its original mass number.
e. never more than its original mass number.

2007-08-01 17:48:32 · 4 answers · asked by Moe K 1

Can Gasoline Boil?
I want links to websites with real creditable facts.

2007-08-01 17:38:52 · 7 answers · asked by cutlassguyeightyeight 2

what will be the volume of the gas sample if the pressure increases to 900 mm and the temperature increases to 35 degrees celisus?

2007-08-01 17:32:39 · 4 answers · asked by Anonymous

2007-08-01 16:19:38 · 4 answers · asked by Anonymous

Whats this drug used for?

2007-08-01 15:40:44 · 1 answers · asked by Julianne B 2

When 4.35 grams of silver metal are dropped in 1000. mL of 2.0 M acetic acid, how many liters of gas are evolved at STP?

can you help me without just giving the answers but showing the steps and reasons for each step?

2007-08-01 14:35:37 · 3 answers · asked by help 1

1. Catalysts can help to bring the reactants together in the correct orientation
2. The chemical formula of a catalyst is written on the left hand side (reactant) side of an equation.
3. Catalysts can provide a surface on which the reaction occurs.
4. Catalysts increase the activation energy.
5. Catalysts increase the magnitude of the equilibrium constant, thus favoring product formation.
6. "Enzymes" are biochemical catalysts.
7. Catalysts increase the rate of a reaction.
8. Catalysts are slowly used up during the reaction and need to be replaced.

2007-08-01 13:48:27 · 7 answers · asked by teddybearchoi 2

The dissociation energy of methane and ethane is 360 an 620 cal/mol. The bond energy of C-C is 80kcal. please explain how

2007-08-01 13:46:35 · 4 answers · asked by Anonymous