Chemistry - July 2007

Incomplete combustion of carbon-containing materials producing some carbon monoxide occurs when _____?

A. There are sulfur impurities in the carbon-containing material
B. There is excess of oxygen
C. The carbon-containing material is a gas
D. Insufficient oxygen to convert all of the carbon to carbon dioxide
E. The combustion flame is too hot

2007-07-27 05:16:24 · 7 answers · asked by cbrice9 1

If a sample of water has a pH of 5.2 due to dissolved carbon dioxide forming the weak acid, H2CO3, with a Ka1= 4.3 * 10^-7, what is the concentration in M. of H2CO3 at equilibrium?

2007-07-27 05:14:19 · 2 answers · asked by cbrice9 1

a. sympathetic nerves
b. spinal nerves
c. cranial nerves
d. nerves that innervate the adrenal medulla
e. splanchnic nerves

2007-07-27 05:13:33 · 1 answers · asked by Futbol 2

a. interact with the mechanoreceptors of olfactory hair membrane
b. enter nose slowly
c. be one of 7 primary classes of odors
d. be dissolved in fluid covering the olfactory epithelium
e. be present in high concentrations

2007-07-27 05:11:15 · 1 answers · asked by Futbol 2

Compare the sources, benefits and disadvantages of chemical, solar ,and nuclear energy.

2007-07-27 04:04:58 · 2 answers · asked by Anonymous

I have a hot date.

2007-07-27 02:03:41 · 5 answers · asked by Anonymous

pls. answer poh...tenk u..

2007-07-27 01:29:33 · 4 answers · asked by pippa 2

what sort of reaction should happen if a hydrogen filled pipet is squeezed into a flame?

2007-07-27 00:22:36 · 2 answers · asked by Vienna 3

2007-07-26 21:57:19 · 2 answers · asked by Anonymous

2007-07-26 21:51:13 · 1 answers · asked by Anonymous

Help..


In a test tube, mix together 0.1g salicyclic acid, 5 drops of methyl alcohol and 5 drops of concentrated H2SO4. Heat.

2007-07-26 21:09:58 · 1 answers · asked by Anonymous

i cant solve this word problem please help me,thanks.

Ethane gas, C2H6, burns in air (i.e., reacts with the oxygen in air) to form carbon dioxide and water:
2C2H6 + 7O2----> 4CO2 + 6H2O

a) How many moles of O2 are needed for the complete combustion of 20.7 mol of ethane?

b) How many grams of CO2 are produced for each 6.66 g of H2O produced?

2007-07-26 20:30:00 · 4 answers · asked by lulu 1

Some people helped me with explaining but now please help me with the equations.

1)Dissolve a small pinch of benzoic acid in 2 mL of hot water (discard any undissolved solid). Add 10% NH4OH til slightly basic to litmus. Boil of excess ammonia. Add 2 drops of ferric chloride solution. What is the equation?

2)Place 2 drops of acetyl chloride in a test tube. Add 5 drops of water carefully. Give the equation.

3)To 2 drops of anhydride in a test tube, add 5 drops of water carefully. Give equation.

4)Heat about 0.1 g of oxalic acid crystals in a test tube with a delivery tube the other end dipping into lime water. What gas is evolved? Give equation.

5)Repeat #4 using 0.1g succinic acid and fresh lime water. Equation.

2007-07-26 20:28:08 · 2 answers · asked by Anonymous

how do you calculate the mass of the following. (Avogadro's number = 6.022E23 particles/mol).

oxygen in 5.52E+22 molecules SO3

2007-07-26 19:05:02 · 3 answers · asked by Anonymous

would you please help me with this problem,

18.0 g oxygen reacts with sufficient nitrogen to make 25.9 g of nitrogen dioxide according to the following reaction:
O2(g) + N2(g)----> 2NO2(g)
If the reaction goes to completion, how much nitrogen reacted?

2007-07-26 18:17:19 · 4 answers · asked by lulu 1

There are some compounds that end in 'hydroxide', for example, calcium hydroxide, or sodium hydroxide. But there are also compounds that end in 'oxide' such as copper oxide. So what is the difference between the compounds ending in 'hydroxide' and the ones ending in 'oxide'?

2007-07-26 18:16:04 · 7 answers · asked by Anonymous

I'm using graphite electrodes with the electrolyte as sodium bicarbonate. There's a strange smell that emits from the electrodes. What is that smell, and should I be worried about it?

2007-07-26 17:51:43 · 2 answers · asked by Jet Flyer 2

"Write balanced equations for the complete combustion of these hydrocarbons. List the hydrocarbon as the first reactant. List the carbon containing product as the first product. Enter formulas with coefficients without a space between the formula and its coefficient. In this question, leave off coefficients of 1 (1 is implied)."

1) propane, C3H8
____ + ____ -----> ____ + ____

2) benzene, C6H6
___ + ___ --------> ____ + _____

3) octane, C8H18
___ + ____ ------> ____ + ____

2007-07-26 17:36:57 · 5 answers · asked by lulu 1

do you know how many milliliters of 0.256 M KCl solution will contain the following?

a) 0.761 mol of KCl
b) 31.8 g of KCl

2007-07-26 16:23:45 · 2 answers · asked by LYF 1

how to identify:
1. Co2
2. Pcl3
3. HCl
4. CaCl2
5. Pbl
using the electronic configuration and electron dot formula??

2007-07-26 15:39:41 · 4 answers · asked by arash17 1

If you have the number of protons and neutrons how do find the number of electrons?

Thanks.

2007-07-26 11:26:54 · 3 answers · asked by Anonymous

2007-07-26 10:20:54 · 2 answers · asked by brainy not !!!!!!!! 1

2007-07-26 10:17:21 · 2 answers · asked by brainy not !!!!!!!! 1

What is the IUPAC name of Asprine?

2007-07-26 10:09:28 · 5 answers · asked by maggamdi 1

a chemist collects 416 mL of nitrogen gas OVER WATER at 60'c
and 677torr. what is the volume of the DRY GAS at STP if the vapor pressure of water at 60'c is 149torr

2007-07-26 08:22:19 · 2 answers · asked by louis h 1

a. gram formula mass
b. gram atomic mass
c. gram molecular mass
d. atomic mass

2007-07-26 07:16:20 · 6 answers · asked by Anonymous

Co, O2, NH3, H2O. . I think it is Co but not sure? ?

2007-07-26 06:32:47 · 8 answers · asked by Anonymous

2007-07-26 06:29:02 · 2 answers · asked by mela 1

a) butanal and b)cyclohexanone

2007-07-26 06:27:00 · 5 answers · asked by mela 1

I have some boric acid powder and want to make a 2% solution. How do I measure the boric acid and put the right amount into the water to make 2%? Actually, it doesn't have to be exactly 2%. Even 3 or 4 percent would probably be okay. A "mild" solution, as it's to be used on the skin to try to kill tinea.

Can this be done by measuring with teaspoons? I am looking for a simple home method, I don't have any laboratory equipment.

2007-07-26 06:17:39 · 3 answers · asked by Marvin 1