Chemistry - December 2007

Please help me!!!!!!!!!

2007-12-02 12:44:50 · 2 answers · asked by Victoria B 2

(You may or may not need all of the reactions, #1-3.)


Eq. #4 4 CO2 (g) + 6 H2O (g) → 2 C2H6(g) + 7 O2(g)
________________________________________

Eq. #1 C2H6(g) → C2H2(g) + 2 H2(g)
ΔH = 189 KJ

Eq. #2 C2H2(g) + 5/2 O2(g) => 2 CO2(g) + H2O(g)
ΔH = - 470 KJ

Eq. #3 H2O(g) => H2(g) + ½ O2(g)
ΔH = 142.5 KJ

Im totally lost. I hope you guys can help. Please explain how you arrive at the answer. I'd like to KNOW how to do this, rather than just simply have the answer. THANKS

2007-12-02 12:21:16 · 1 answers · asked by Charles Gerald S 1

Can you please help me to understand this, or at least give me the answers?

"A test is carried out to determine the presence or absence of the ions that are listed. State if the test results indicate if each possible ion is present, absent, or undetermined."

1. Test for Ag+, Cu^2+, Fe^3+
Some 6 M HCl is added to a solution that may contain the three ions. A white precipitate forms.

2. Test for Mn^2+, Fe^3+, Cu^2+
Some 3% H2O2 and 6 M NaOH are added to a pale blue solution. A dark precipitate forms, which totally dissolves when 6 M H2SO4 is added. Addition of 6 M NH3 to the solution until it is basic results in a deep blue solution containing a dark precipitate. The dark precipitate completely dissolves in H2SO4.

There are 4 more, but if I post them all you guys probably won't answer! haha. thanks in advance for the help.

2007-12-02 12:18:29 · 1 answers · asked by missingfeet 2

5.00 x 10^21 formula units of nickel II sulfate


7.66 x 10^19 molecules of hydrogen peroxide

2007-12-02 12:03:15 · 3 answers · asked by ambie♥ 3

Methanol, CH*3OH, is used in the production of many chemicals. Methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure.

CO(g) + 2H*2(g) --> CH*3OH(g)

a) How many moles of each reactant are needed to form 6.00 times 10*2g of CH*3OH?

b) Calculate the number of grams of each reactant needed to produce 10.0 mol of CH*3OH.

c) How many grams of hydrogen are necessary to react with 5.74 mol of CO?

2007-12-02 10:53:57 · 1 answers · asked by (: Muffin Man :) 2

2007-12-02 10:32:54 · 13 answers · asked by Anonymous

another scientific question.

2007-12-02 09:41:05 · 13 answers · asked by Clueless Person 1

What is the right way to balance these complex equations? I don't think I am doing it correctly, which is why I'm having such a hard time. For example:

C3H6 + NH3 + O2 -> C3H3N + H2O

What steps do I take to balance this so I don't screw it up and can do it as quickly as possible and properly?

2007-12-02 09:15:25 · 2 answers · asked by myname_isalbert 1

a science question of atoms. i cant figure it out, and i need help. please answer it with steps so i can see how you did it. thank you =]]

2007-12-02 08:56:23 · 3 answers · asked by Clueless Person 1

2007-12-02 08:49:41 · 4 answers · asked by Anonymous

1. )when do you use cis and trans? I am so confused..
i am learning about alkynes . . and while naming them
some have trans or cis before them..how do i know when to
put them?

2.) When do you use nonen?

2007-12-02 08:48:59 · 3 answers · asked by Velvet - joux 3

What are the three species that actually exist in significant amounts in a one-tenth molar aqueous solution of HCl?

Explain why hydrogen ion (H+) is NOT one of the three species.

2007-12-02 08:47:50 · 1 answers · asked by RogerDodger 1

Why does N2 + O2 -> 2NO

The valence for N is 3+ and O is +2 so shouldn't it be

N2O3 ?

2007-12-02 08:39:46 · 1 answers · asked by myname_isalbert 1

2007-12-02 08:34:06 · 2 answers · asked by Anonymous

1. An iron ore sample is a mixture of Fe2O3 and several impurities. A 752. g sample of the impure iron ore is heated with excess carbon. Only the Fe2O3 present in the ore reacts with the carbon producing 341. g of carbon monoxide by the following reaction. What is the mass percentage of Fe2O3 in the impure iron ore sample?
Fe2O3 + 3C --------> 2Fe + 3CO

2007-12-02 08:30:52 · 1 answers · asked by Anonymous

We are discussing the lewis structure of compounds however, i cannot find any subject on determining when a compound is polar or nonpolar? Does it have to do with its electronegitivity?

2007-12-02 08:27:00 · 1 answers · asked by Anonymous

2007-12-02 07:14:16 · 12 answers · asked by chester T 1

Oxygen is found in the atmosphere as a diatomic gas, O2
and ozone is found as O3

Here is the question i have, i didnt get this right on my ap chem test and i want to know how to do it

Use the principles of bonding and molecular structure to account for the fact the ozone has a higher boiling point than diatomic oxygen.

2007-12-02 07:06:16 · 2 answers · asked by Anonymous

a) Why does air pressure increase when u pump up a bike tyre??????


B)how would the air pressure change as the temperature got warmer


C)Biefly explain your answer to part B

D) Explain why tyres that contain air avbsorbing bumps are better than solid rubber tyres....


???????


thank u (if u answered).......

p..s.....u dont have 2 answer all of them

Thank u once again....

2007-12-02 06:57:54 · 2 answers · asked by Anonymous

Ok, I'm stuck on my homework, the question asks me:

1. what are the type of chemicals used up during "cracking" ?

The choices are : a-short Molecules, b-long molecules, c-saturated hydrocarbons, d-unsaturated hydrocarbons, e-sulphur, f-high demand oil fractions, g-low demand oil fractions, h-catalysts, I-tarmac, j-plastics.

What two of a,b,c,d,e,f,g,h,i and j, should I choose ? I really need this !

2007-12-02 06:49:35 · 3 answers · asked by pop 4

2007-12-02 06:43:15 · 2 answers · asked by terriann m 1

2007-12-02 06:34:39 · 23 answers · asked by Anonymous

for a school project

2007-12-02 06:00:36 · 4 answers · asked by Ale Da Pinklover 1

but does not conduct electricity in the solid phase. The substance is most likely

A. a metallic solid

B. an ionic solid

C. a molecular solid

D. a network solid

2007-12-02 05:19:38 · 3 answers · asked by Chris M 1

How much energy would be require to ionize 5.00mg of Na(g) atoms to Na+(g) ions? THe first ionization energy of Na atoms is 490 kJ/mol.

2007-12-02 05:15:25 · 2 answers · asked by Anonymous

This solid could be

A. C6,H12,O6

B. Hg

C. KCl

D. CO2

2007-12-02 05:13:27 · 2 answers · asked by Chris M 1

Just a little strange isn't?
Why do they become transparent when they weren't to begin with? Please help, oh wise ones........

2007-12-02 03:38:12 · 3 answers · asked by john m 1

2007-12-02 03:33:31 · 3 answers · asked by Anonymous

Like does anyone know What acids are in soda and will they interact with Water to make it Not Evaporate?!

2007-12-02 02:49:46 · 5 answers · asked by Anonymous

2007-12-02 02:42:12 · 2 answers · asked by saeed khan 1