Chemistry - May 2007

2007-05-31 23:33:26 · 5 answers · asked by luka v 1

2007-05-31 23:29:24 · 1 answers · asked by Anonymous

Mordants are usually metal ions with valence above two. And it will form metal complexes with certain dye. I want to know how exactly the electrons go and how it attach to the fabric better than dyeing without mordants. Thanks a lot.

2007-05-31 21:52:07 · 1 answers · asked by Anonymous

when H2O is in its solid state, its molecules are


a) different from water

b) different from water vapor

c) lined up in an orderly pattern

d) not moving


2) the states of matter are

a) solid
b) liquid
c)gas
d) all of the above

2007-05-31 21:43:00 · 8 answers · asked by lisy g 1

This is urgent!!!!!!!!!

2007-05-31 21:28:17 · 6 answers · asked by Anonymous

2007-05-31 21:21:35 · 2 answers · asked by jmotsoadi 1

what is the atomic, mass, proton & electron number of a oxide ion if the number of neutrons is 8? Also, what is the configuration number of it?

who came up with the big bang theory?

who came up with the steady state theory?

2007-05-31 20:58:17 · 1 answers · asked by Anonymous

whats the shape of--

PCl3 ?
PCl5 ?
POCl3 ?

and their bond angles too ?

2007-05-31 19:57:29 · 3 answers · asked by gunkedar 2

27. A beam of blue light has a wavelength of 595 nm. What is its frequency?
2.40 x 100 Hz
5.04 x 1014 Hz
4.36 Hz
5000000000000 Hz

28. If the wavelength of an electromagnetic wave is 401 mm, what is its frequency?
7.48 x 108 cycles per second
7.48 x 105 cycles per second
1.34 x 10-9 cycles per second
3.00 x 108 cycles per second

29. If the energy of a particle is 1.5903 x 10-29 joules, what is the wavelength of the particle?
12,499 m
6.94 x 104 m
1.25 x 104 m
24,000 m

30. If a wave completes 876 cycles in a minute, what is its frequency? 14.6 Hz
5.26 X 104 Hz
6.85 x 10-2 Hz
impossible to determine

31. If a wave has a frequency of 6.9536 x 109 Hz and an energy of 4.6076 x 10-24 J, what is its amplitude?
532 nm
3.9574832 x 103 nm
100 nm
all of the above are possible amplitudes

32. If a wave has a frequency of 6.9536 x 109 Hz and an energy of 4.6076 x 10-24 J, what is its wavelength?
4.3143 x 102 m
4.31 x 10-2 m
6.95 x 109 m
6.6262 x 10-34 m

2007-05-31 19:43:21 · 4 answers · asked by qdark 3

2007-05-31 19:14:34 · 1 answers · asked by Keke B 1

2007-05-31 19:13:06 · 1 answers · asked by sheepthe2nd 1

please help me describe the relative strengths of acids and bases in conjugate pairs

2007-05-31 18:30:07 · 4 answers · asked by qdark 3

How to increase electrochemical cell voltage

2007-05-31 17:46:34 · 2 answers · asked by Matthew T 2

Anything other than vinegar and baking soda

2007-05-31 17:45:23 · 4 answers · asked by Anonymous

My daughter is doing an experiment where she knows the pH of various solutions. She adds an acid with a base and were expecting the resulting solution to be pH neutral.

The vinegar - baking soda reaction turned out to be pH 10, no matter what percentage of baking soda was added to the vinegar.

I thought the formula would simply be (pH1 + pH2)/2, so we expected the following:

Vinegar - pH = 2
Baking Soda - pH = 10

Resulting solution (2+10)/2 = 6

Not what we measured. Any ideas?

2007-05-31 17:45:23 · 5 answers · asked by Anonymous

this metal is unknown and i need help to figure it out it has luster and malleble greyish brown with hint of silver. can someone give all the brown looking metals that are elements?

2007-05-31 17:44:34 · 1 answers · asked by Anonymous

its chem

2007-05-31 17:36:43 · 4 answers · asked by Anonymous

How many milliliters of a 355 NaCl solution should be used to prepare a liter of 0.90% NaCl solution?

Determine the amount of 0.50Eq/L Ca(OH)2 required to titrate 10.0 ml of a 2.50 Eq/L HCl solution?

How much Ca3(PO4)2 is needed to prepare 2.00 deciliter of a 100 mg/dL calcium solution?

2007-05-31 17:33:20 · 1 answers · asked by prime7 2

2007-05-31 17:27:51 · 6 answers · asked by Anonymous

2007-05-31 17:16:30 · 1 answers · asked by Anonymous

a sample of nitrogen gas occupies 1.55L at 27 degrees C and 1.00atm pressure. what will the volume be at -100degreesC and the same pressure?

2007-05-31 17:13:30 · 3 answers · asked by Anonymous

What are the similarities and differences of cocaine and adderall in regards to chemical composition and chemical arrangement of the molecule at the atomic level.

2007-05-31 17:06:54 · 1 answers · asked by Kevin 2

Muscle fatigue felt during and after a stenuous workout is caused by the build of lactic acid (CH3ChOHCOOH). In the acqueous solution with the equilibrium pH of 1.935, what is the Ka for this weak acid?

2007-05-31 16:49:48 · 1 answers · asked by Anonymous

Lazlo prepared a 400.0mL solution of nitric acid (a strong acid) with 3.00 moles of acid. What it eh pH and the pOH of this solution?

2007-05-31 16:47:41 · 3 answers · asked by Anonymous

Caculate the pH of .100M solution of the strong acid HCL.

2007-05-31 16:43:22 · 3 answers · asked by Anonymous

which 1 produced the most cheese and why :
1) 10'c ,25,'c,45'c,60'c
2) skim milk,medium fat milk,hight fat milk,highest fat milk (full cream)
3) lowest calcium,medium calcium,highest calcium
4) fresh milk,2 days milk,a week milk, 2 weeks milk

2007-05-31 16:34:11 · 1 answers · asked by fashaleviana 1

Also how many moles of potassium nitrate did you use?

Also- If the density of sulfuric acid is 1.84 g/mL how many moles did you use?

Finally- How many moles of ammonum chloride did you use?

If anyone could help me with these questions that would be so great because I have a huge lab due in chem tmr and I have no clue how to do these questions! Thanks so much!

2007-05-31 16:32:43 · 1 answers · asked by Anonymous

What is the most accurate way an unknown pH can be determined?

How can an indicator be used to measure the pH of a solution?

2007-05-31 16:02:25 · 4 answers · asked by jumba 1

Write a balanced equation for the reaction of phosphorus trichloride, PCl3, with water, H2O, forming phosphorous acid, H3PO3 and hydrochloric acid, HCl. Calculate the heat of reaction from the standard heats of formation listed below. Then, calculate the standard enthalpy change when 64.0 grams of water is consumed in this reaction. standard heat of formation(PCl3) -287 kJ/mol standard heat of formation(H2O) -285 kJ/mol standard heat of formation(H3PO3) -972 kJ/mol standard heat of formation(HCl) -167 kJ/mol

need help with test review sheet. thanks

2007-05-31 15:24:38 · 3 answers · asked by Anonymous

2007-05-31 14:54:55 · 1 answers · asked by kaz l 2