Chemistry - May 2007

Does anyone know? I'm supposed to write an entire essay about this, and I can't even find it in my book. And I'm a very good student. Can someone help me out here? And make sure it's in language that a freshman can understand.

2007-05-02 15:27:36 · 3 answers · asked by Anonymous

The answer is .18, but I have no idea how I got it. Can someone help?

2007-05-02 15:25:35 · 2 answers · asked by Fuzz 1

During an effusion experiment, it took 75 sec. for a certain number of moles of an unknown gas to pass through a tiny hole. Under the same conditions, the same number of moles of oxygen gas passed through the hole in 30 sec. What is the molar mass of the unknown gas? Show your work please.

2007-05-02 15:20:06 · 1 answers · asked by ? 1

like if i disolved some sodiom bicarbonat how do i turn i back to baking soda

2007-05-02 15:07:37 · 1 answers · asked by paul b 2

i don't understand how to do these problems.

2007-05-02 15:07:05 · 3 answers · asked by Nikki L 1

2007-05-02 15:06:36 · 1 answers · asked by Coolbear4 4

Suppose you have (CoCl4 2+) + H2O (arrows for equilibrium) (Co(H2O)6 2+) + Cl- and CoCl4 2+ is blue and Co(H20)6 2+ is red. When you heat it up, it turns blue. Based on this, is this reaction exothermic or endothermic? Thanks!

2007-05-02 15:01:51 · 4 answers · asked by Anonymous

2007-05-02 15:00:57 · 12 answers · asked by Anonymous

thankkk youuuuUuu

2007-05-02 14:58:57 · 2 answers · asked by classy.chic 3

What effect would the dissolving of large amounts of atmospheric carbon dioxide in bases(magnesium hydroxide, barium hydroxide and calcium hydroxide) have on the measured pH? On the calculated Ksp? Why?

The pH of Barium hydroxide is 7.15
Magnesium hydroxide is 6.95
Calcium hydroxide is 7.19

2007-05-02 14:57:14 · 3 answers · asked by shilpa u 1

a N = A(t1/2/0.693)
b ln(Nt/Ni) = –kt
c The SI unit for nuclear decay reactions is Bq, which stands for 1 becquerel. It is equal to 1 disintegration/s. An older, non SI unit is the curie (Ci), which is 3.7 × 1010 disintegrations/s.
d At = Aiekt

2007-05-02 14:47:31 · 1 answers · asked by Virginia M 1

1. List one advantage and one disavantage of using nuclear power plants to produce eletricity.

2. Carbon-14 undergoes geta decay to become another element. What is the new element? What is the product of the radioactive decay?

DO NOT SAY "DO YOUR OWN HOMEWORK" OR ANYTHING RELATED!

2007-05-02 14:46:38 · 1 answers · asked by Not Here 3

A 100 ml sample of .200 M acetic acid (Ka=1.8x10^-5) with 100 ml of .200 M NaOH. What is the pH?

The answer is 8.87 but im unsure of the process. I though that you set up an equation like conc. of products over the conc. of the reactants and set it equal to Ka but it didn't work out.

Its finals week and i appreciate everyone that helps out here, you're all great. Thank You!

2007-05-02 14:46:02 · 1 answers · asked by Travis M 1

You have a sample of bone collected from Nevada and you find that it contains strontium-90 and exhibits an activity of 2.5 Bq. How much strontium-90 was present in the bone when the animal died 45 years ago. The half-life of 90Sr is 29 years.

A 1.1 x 108
B 9.7 x 108
C 3.3 x 108
D 1.5 x 10

2007-05-02 14:45:32 · 1 answers · asked by Virginia M 1

1. Which of the following gases deviates most from idea behavior?

A) SO2
B) Ne
C) CH4
D) N2
E) H2

and explain why please. what does "ideal" gas mean? and wat is the Raoult's law?

thanks for your help

2007-05-02 14:44:56 · 1 answers · asked by whatever 2

If the specific heat of the metal is .7 cal/g degree celcius what is the final temp

2007-05-02 14:41:10 · 1 answers · asked by Anonymous

During an effusion experiment, it took 75 sec. for a certain number of moles of an unknown gas to pass through a tiny hole. Under the same conditions, the same number of moles of oxygen gas passed through the hole in 30 sec. What is the molar mass of the unknown gas?

2007-05-02 14:28:27 · 1 answers · asked by ? 1

A 0 K
B 100 K
C 273 K
D 373 K

2007-05-02 14:28:09 · 4 answers · asked by Blade L 1

What what be the equation for the reaction of a person who takes calcium supplements on a daily basis to prevent osteoporosis, but the person suffers from osteoporosis and has gout too, and she may also develop kidney stones which can consist of calcium urate?

2007-05-02 14:23:25 · 1 answers · asked by Shane 1

As a crystalline solid dissolves, particles separate from the lattice-like arrangement of molecules or ions in the ____________ and become uniformly distributed among the _____________ particles, usually molecules.

2007-05-02 14:22:34 · 1 answers · asked by Meno 1

2007-05-02 14:22:23 · 2 answers · asked by perez n 1

2007-05-02 14:21:44 · 2 answers · asked by classy.chic 3

name three acids you find in the home

2007-05-02 14:16:21 · 4 answers · asked by sweetie 1

2007-05-02 14:10:25 · 1 answers · asked by Anonymous

thx

2007-05-02 13:59:06 · 1 answers · asked by Anonymous

carbon disulfide plus oxygen gives carbon dioxide pus sulfur dioxide
work it out please bc i really dont get it !!!

2007-05-02 13:51:13 · 1 answers · asked by Bruno S 3

How many grams of NO were formed and how many molecules of HNO3 were reacted?

2007-05-02 13:48:38 · 1 answers · asked by Anonymous

??
thanxx!!

2007-05-02 13:45:14 · 4 answers · asked by classy.chic 3

collected during this experiment? Include sample calculations demonstrating how the specific heat would be determined.

2007-05-02 13:42:39 · 1 answers · asked by RissaRee 1

writing:
suppose you found a small stone of irregular shape. design and describe the steps and procedures that could be used to measure the density of the stone. describe the equipment you would use and what steps you would follow.

thank you sooo muchhh :]

2007-05-02 13:41:13 · 2 answers · asked by Anonymous