Chemistry - February 2007

2007-02-08 04:29:26 · 2 answers · asked by Anonymous

What is it? If I'm writing a paper about it what would i say it?

2007-02-08 04:28:35 · 2 answers · asked by erica 1

2007-02-08 04:24:12 · 4 answers · asked by Jackie G 1

2007-02-08 04:19:59 · 4 answers · asked by Rajeeva R 1

What occurs at the molecular level when a liquid-vapor equilibrium exists?

A. The number of molecules in the liquid state equals the number in the vapor state.
B. The molecular changes at a liquid-vapor equilibrium depend on the temperature.
C. The rate of molecules overcoming attractive forces is equal to the rate of molecules entering the solid state.
D. Each molecule spends half the time as a liquid and half the time as a vapor.
E. The changes between liquid and vapor stop, and the amount of each becomes fixed.

2007-02-08 04:19:31 · 3 answers · asked by MEB 2

calculate the percentage of Ca in a mixture that contains 14.090g of cadmium, 15.050g calcium, and 17.500g sand.........

2007-02-08 04:05:25 · 4 answers · asked by mimi 1

Calculate the percentage of oxygen in Al2O3

2007-02-08 04:03:14 · 2 answers · asked by mimi 1

I am reviewing for my general chemistry 2 class and I need some help refreshing my memory. If you can answer any of these questions I would really appreciate it. thanks

1. An aqueous solution of barium hydroxide is mixed with sulfuric acid to produce solid barium sulfate and water. Balance the equation . Indicate the physical state of each reactant and product.

2. What volume 0.250 M sulfuric acid is needed to neutralize 50.0 mL 0.500 M barium hydroxide?





3. What amount of barium sulfate could theoretically form in the reaction?





4. List all species present in the solution after the reaction has gone to completion (i.e. when the barium hydroxide is completely neutralized?

2007-02-08 04:02:35 · 1 answers · asked by rockabilly.betty 2

what type of chemicle reaction can pentane undergo?

2007-02-08 04:02:12 · 1 answers · asked by danity0414 2

Using the quantaties 25 ml .0200 M KIO3 solution and 1.00 g KI solution, Show that KIO3 is the limitng ractant in the equation:

6H+KIO3+8KI--> 9K+3I3+3H2O

I do not fully understand how to determine the weight of the products or find out how it is the limiting reactant.

2007-02-08 03:55:58 · 2 answers · asked by Anthropomorphic 2

I've some wavelength of different element from a spectrometer and i need to compare it to existing one to identify which elements are present

2007-02-08 03:55:02 · 4 answers · asked by anwar r 1

Using the quantaties 25 ml .0200 M KIO3 solution and 1.00 g KI solution, Show that KIO3 is the limitng ractant in the equation:

6H+KIO3+8KI--> 9K+3I3+3H2O

I do not fully understand how to determine the weight of the products or find out how it is the limiting reactant.

2007-02-08 03:48:46 · 4 answers · asked by Anthropomorphic 2

2007-02-08 03:48:37 · 6 answers · asked by babu 1

Problem A.
15g of sodium hydrogencarbonate was reacted with a solution of hydrochloric acid that contained by mass 15g of HCL.
Calculate the moles of each reactant. Which is the limiting reagent? Calculate the theoretical yield of NaCl. If 9.9g of NaCl was obtained on evaporation of the water, what is the experimental percentage yield?


problemB
10g of sodium hydrogencarbonate was reacted with 100mL of 1 M HCl. Calculate the moles of each reagent. Which one is the limiting reagent? Calculate the theoretical yield of NaCl. If only 3g of NaCl were obtained, what is the experimental percentage yield? Offer a reason why there was such a difference in the final experimental yields between the two methods.

2007-02-08 03:47:50 · 3 answers · asked by Nina 2

what is the energy, in kJ, of one mole of photons of this radiation?

Enter a numeric answer only.

2007-02-08 03:41:08 · 3 answers · asked by Anonymous

I know polarity is one answer... I need at least one more and I have searched everywhere.

2007-02-08 03:40:59 · 2 answers · asked by Cherriest 7

2007-02-08 03:38:48 · 2 answers · asked by jem j 1

If both (in granule form) were poured into a water tank and a motor inside the tank rotates at a certain constant speed will either separate with one floating to the top and the other saturating to the lower part of the tank?

2007-02-08 03:27:54 · 3 answers · asked by got2b_chris 1

A synthetic chemist(whether inorganic or organic) is interested in obtaining “practical” or experimental yields that are as high as possible; this is even more important for the industrial chemist who is making tons of material, such as ammonia. A poor yield means loss of profit. How do you calculate an experimental yield?

2007-02-08 03:24:04 · 2 answers · asked by Nina 2

Assume that you have a 0.1 molar solution of sodium peroxoborate. What percent would be decomposed to hydrogen peroxide?

2007-02-08 03:19:44 · 1 answers · asked by Anonymous

structure and utilities in the lab

2007-02-08 03:15:15 · 5 answers · asked by trocks666 1

2007-02-08 03:12:15 · 2 answers · asked by torirowe 2

Describe the impact each change has on the environment.

2007-02-08 03:11:32 · 1 answers · asked by torirowe 2

2007-02-08 03:10:23 · 2 answers · asked by torirowe 2

What is the boiling point of a solution of 125.0 g of C6H12O6 in 350 g C2H5OH? Kb for C2H5OH is 1.19ºC/m and the boiling point of C2H5OH is 78ºC.

2007-02-08 03:08:19 · 2 answers · asked by MEB 2

. A mixture of gases X, consisted of 20cm methane, 46cm ethane, and 90cm butane.
This mixture was exploded with 850cm oxygen and the products were cooled to
room temperature and a pressure of 101.3 kPa.

i.Calculate the partial pressure of each gas in the mixture, X.
ii.How the presence of could be detected of ethane mixture?
iii.Calculate the volume of oxygen needed for the complete combustion of mixture X?
iv.Calculate the partial pressure of carbon dioxide in the final mixture.

2007-02-08 03:05:37 · 1 answers · asked by affy 2

2007-02-08 03:03:42 · 1 answers · asked by lil_mayra 1

I need help with the math part of stiochiometry converting moles to atoms or moles to grams

2007-02-08 03:03:21 · 3 answers · asked by dleffew9 1

Is anyone aware of a software that can draw chemistry structures.

2007-02-08 02:58:59 · 3 answers · asked by wwjd_man_isa 1

How would you make solid NaBO2? I need to answer this for my lab and I can't figure out how to answer it. Please help!!!

2007-02-08 02:43:38 · 1 answers · asked by Anonymous