Chemistry - June 2007

2007-06-28 15:47:50 · 5 answers · asked by Anonymous

I am currently in a chemistry 101 class and my professor adamantly believe that colloids fall under heterogenous mixtures only . I have researched on a few definitions of colloids and some sources say that it is a heterogenous mixture, others say its a homogenous mixture. And some even say that it is both. Even the wikipedia source is confusing because under colloids it is considered a heterogenous mixture but when you look at the definition of mixtures and the different kinds, colloids (or colloidal dispensions are referred to as homogenous) fall under homogenous mixture. So if it is both, what then makes a colloid a homogenous mixture and a heterogenous mixture? Thanks!

2007-06-28 15:39:53 · 8 answers · asked by Kicks007 2

2007-06-28 15:34:24 · 7 answers · asked by kenane w 1

nitrogen oxygen argon&carbon diaxide are? a.4most comon gases in the atmosphere b.CFCs c.Causes of the green..

2007-06-28 15:27:56 · 4 answers · asked by kenane w 1

I tried measure the weight of 10 mL of deionzied water and noticed it didn't weight exactly 10 g on scale but couple grams greater (yes, I did reset the scale before measuring and subtracted the weight of the beaker) So what is the real cause of this?

2007-06-28 15:15:50 · 9 answers · asked by Ivy 1

Looking for testing services on the west coast, California, that can give % or PPM concentrations of the elements in a sample of solder. This is for RoHS verification of wave solder machine pots.

2007-06-28 11:37:14 · 2 answers · asked by DW 1

i want to know cause me and my fam is diccusing......we all have no idea!!!!!!!!!!1

2007-06-28 11:19:22 · 8 answers · asked by eneida96 1

How much heat is required to change 1.0 kg of ice, originally at -20.0°C, into steam at 130.0°C??

2007-06-28 10:51:55 · 4 answers · asked by idontwantanickname 1

If you are doing a chromatography experiment working with Phenol Red and an unknown solution. What would happen if you did not clean the capillary tube (used to measure the solutes) well enough between applications of the two?

2007-06-28 10:48:13 · 1 answers · asked by Ginger 1

Ethanol is mixed with gasoline and sold as gasahol. If the combustion of 1.00 mole of ethanol has an enthalpy of reaction of -1235 kJ, how many grams of ethanol must be burned to provide 293 kJ of heat? Provide an answer correct to 2 significant figures


Thanks in advance for your help!!!

2007-06-28 10:42:28 · 2 answers · asked by Anonymous

I have to do a chem lab where there is water with lead and copper nitrates. Today we put in potassium iodide to get rid of the lead nitrates, but how do we get rid of the copper nitrates. we have to get the water to clear (its green now) and a pH of 7 (its way below that, very acidic) so any ideas? thanks so much!

2007-06-28 10:38:29 · 6 answers · asked by ♥...........♥ 5

an oxide of chromium is 68.4% chromium by mass. the molar mass of the oxide is 152g/mol. what is the formula of the compound?

2007-06-28 10:37:14 · 4 answers · asked by Anonymous

It is well known that carbon dioxide is denser than air.
What are some other very dense heavy gases? What is the densest known gas?

2007-06-28 09:56:15 · 7 answers · asked by Jeffrey K 7

I have no idea how to solve these two equations. Can you please solve them and explain how you did it? my book is no help.

1. A strip of Magnesium is dropped into 6 M hydrochloric acid.

2. Chlorine gas is bubbled through a solution of potassium iodide.

2007-06-28 08:26:50 · 4 answers · asked by Marti 6

When you're naming them, is there ever alternate ways to pick the 'longest' chain but still get to the same answer? Or is there always one way. I've seen a couple doing some online quizzes where I pick a different chain but still get the same answer.

2007-06-28 08:07:41 · 2 answers · asked by de4th 4

2007-06-28 08:06:57 · 2 answers · asked by carlos s 1

Does it mean that i just use the VSEPR model and draw the correct one or do i do something else?

2007-06-28 08:01:19 · 3 answers · asked by Sean F 2

Simple what is the difference????

2007-06-28 07:59:31 · 6 answers · asked by grr509 1

How do you make liquid hydrogen ?

Is there such thing as crystalized hydrogen ?

2007-06-28 07:28:31 · 8 answers · asked by Smile 2

Estriol, a potent estrogenic hormone, has been isolated from the urine of pregnant women. When 40mg of estriol is dissolved in 1.0 mL of dioxane and placed in a sample tube with 1 dm path length a rotation of +2.32 degrees is observed. Calculate the specific rotation for estriol.

2007-06-28 07:21:30 · 2 answers · asked by annhall90 1

2007-06-28 07:18:33 · 4 answers · asked by Aki 2

primary
secondary
quaternary
pentamerous
tertiary

2007-06-28 07:15:59 · 2 answers · asked by Anonymous

protons . . . neutrons
neutrons . . . electrons
neutrons . . . protons
electrons . . . protons
protons . . . electrons

2007-06-28 07:15:21 · 5 answers · asked by Anonymous

I know you use water but how do you end up with a HHO gas?

2007-06-28 07:13:31 · 7 answers · asked by Anonymous

2007-06-28 07:10:01 · 10 answers · asked by Anonymous

2007-06-28 07:02:57 · 4 answers · asked by Steven B 1

I wanted to disolve galena with an acid, wich acid can disolve the galena?

2007-06-28 06:57:54 · 3 answers · asked by Anonymous

2007-06-28 06:54:37 · 8 answers · asked by gary g 1

2007-06-28 05:21:15 · 5 answers · asked by rick m 1

___ I2 + ___ S2O32- 


___ Cu2+ + ___ NH3 


___ Mg2+ + ___ OH- 


___ Ba2+ + ___ SO42- 


How many years would it take for the mass of a 1.000g-sample of carbon-14 to be reduced to 0.125 g?

2007-06-28 03:26:16 · 2 answers · asked by mad hatter 2