Chemistry - April 2007

2007-04-10 19:05:47 · 1 answers · asked by Me + Me = BANG! 2

After the reacitons were complete, she found that 0.0356 moles of CO2 had reacted. Calculate the mass of BaO and CaO reactants.
CaO+CO2-->CaCO3
BaO+CO2-->BaCO3

2007-04-10 18:46:47 · 1 answers · asked by Anonymous

Use heat of formation data to determine the standard enthalpy of reaction for the reaction:
2NH3(g) --> N2(g) + 3H2(g)

2007-04-10 18:22:54 · 1 answers · asked by Anonymous

A. 5.0 mol H2o
B. 3.5 mol NH3
C. 8.0 mol C
D. 6.0 mol C2H2

2007-04-10 18:21:40 · 4 answers · asked by Anonymous

A. hydrogen
B. Sulfur
C. Oxygen
D. any of these

2007-04-10 18:20:01 · 4 answers · asked by Anonymous

Compute the standard free energy change for the following reaction.
PbO2(s) + 2 Ni(s) --> Pb(s) + 2 NiO(s)

2007-04-10 18:01:39 · 2 answers · asked by Anonymous

A; its a physical property
B: Personal property
C: Real Property
D. Chemical property

2007-04-10 17:55:00 · 8 answers · asked by Anonymous

2007-04-10 17:38:08 · 4 answers · asked by surfing86 2

What is the molar mass of Z? There is a 50 % yield...I think this means i just divide my answer by 2...

2007-04-10 17:35:58 · 3 answers · asked by Anonymous

what is the molecular equations, th complete ionic equation, and the net ionic equation for this reaction?

CH(3)COOH + NaOH ----->

2007-04-10 17:25:34 · 1 answers · asked by Hey hey 1

Here's the question:
Based upon the notion of weak and strong acids and bases, which of the following reactions would you expect to produce the largest delta H neut? The smallest delta H neut? What kind of value of delta H neut would you expect of the remaining reaction?

(a) HCl + NaOH ---->

(b) NH(4)OH + HNO(3) ------>

(c) NH(4)OH + CH (3)COOH ------>

thanks for the help.

2007-04-10 17:23:36 · 1 answers · asked by Hey hey 1

What products would be observed upon the dehydration of 1-methyl-1-cyclohexanol?

2007-04-10 17:20:08 · 3 answers · asked by asdf1234 2

I need help with this Chem problem:
Calculate the number of calories of heat energy required to change the temperature of 5.0-gm of water from 21.1 to 29.3 degrees celcius.

thanks for the help.

2007-04-10 17:19:47 · 5 answers · asked by Hey hey 1

I dont get it.. Popcorn so fasinating.

1. How the heck can a small object grow 20 times it size in a fraction of a second.

2. Does popcorn remain the same weight? or does it increase when popp'ed?

3. What kind of chemical react when heat is enforced?

4. If you ate, say, 500 unpopped corn oneday and then ate the same ammount of popped corn the next day, which would fill you up the most.

5. Does a unpopp'ed corn have more nutriants than popp'ed corn.

6. How come some popcorn kernals dont pop. The just fail to react. Why?

7. What changes the core of a kernal from yellow to white, when it pops?

8. Why does the kernal have to be dry to pop?

9. Can the popping process be slowed down enough to be seen by eye?

10. Why does it make a sound when popped?

Please help i will aprieate it.

2007-04-10 17:17:56 · 5 answers · asked by Anonymous

When you go down the periodic table, you get more protons AND more energy levels. My impression is that the Z-effective would cancel out with the shielding when going down a group.. but I know that isn't the case.

Why is the #energy levels more important than the Z-effective when going down the periodic table?

2007-04-10 17:12:20 · 3 answers · asked by Dave H 2

What mass of barium sulfate can be produced when 100.0mL of a .100M solution of barium chloride is mixed with 100mL of a .100M solution of iron(III) sulfate?

2007-04-10 17:02:47 · 2 answers · asked by Anonymous

2007-04-10 16:59:59 · 3 answers · asked by Nimmy T 1

If so, why or why not?

Thanks in advance

2007-04-10 16:57:05 · 3 answers · asked by some guy 1

What mass of solid aluminum hydroxide can be produced when 50.0mL of .200M Al(NO3)3 is added to 200.0 mL .100M KOH?

Not sure how to do this..

Al(NO3)3 + 3KOH --> Al(OH)3 + 3KNO3

2007-04-10 16:56:01 · 2 answers · asked by Anonymous

1) Hg(l)
2) H20 (l)
3) NaCl (s)
4) C6H12O6 (s)

2007-04-10 16:49:18 · 2 answers · asked by Anonymous

How can i get whether given compounds react with each other or not ? And if they react what are the products ? Please tell me how to guess about this .

2007-04-10 16:42:35 · 1 answers · asked by Rajchem 2

How can i get whether given reactants react with each other or not ? And if they react what are the products ? Please tell me how to guess about this .

2007-04-10 16:39:21 · 1 answers · asked by Rajchem 2

from the hydrogen burn if it was flames from the hydrogen vs. the thermite theory.

2007-04-10 16:21:06 · 1 answers · asked by Anonymous

2007-04-10 16:14:16 · 1 answers · asked by substance 2

If you're kind enough, I would like an answer from a more chemical perspective?

2007-04-10 16:09:59 · 4 answers · asked by some guy 1

what happens with gas laws on the molecular level

2007-04-10 15:37:05 · 1 answers · asked by aggieman12002 2

25) Give an example of the composition of an acid buffer. Briefly explain with the use of equations how this buffer maintains the pH when small amounts of acids and bases are added.

2007-04-10 14:54:34 · 1 answers · asked by studentofscience 1

2007-04-10 14:36:42 · 2 answers · asked by Jamgirl108 1

Which of the following are true about transition metal elements ?


(a) As the atomic number increases for d-block transition elements, electrons are added to outer s and p orbitals

(b) Metals in high oxidation states tend to be good oxidizing agents

(c) A common oxidation state of scandium is +2

(d) Going across a period the atomic radii does not change a great deal.

(e) As the atomic number increases for the lanthanides and actinides transition metal elements,
electrons are added to an inner f orbital.

2007-04-10 13:55:38 · 3 answers · asked by Anonymous

What is the concentration in Molar units of sulfate ions present in 67.2 mL of 0.286 M solution of K2SO4 mixed with 59.9 mL of 0.345 M solution of Na2SO4?

Please help me solve this problem and show the steps to take in solving it. Thanks

2007-04-10 13:49:07 · 2 answers · asked by nglennie_06 1