Chemistry - January 2007

This question was proposed in my chem class, because the first periodic table(which was based on atomic mass) appeared in 1869, however atomic mass wasn't found till 1913. Currious?

2007-01-08 12:48:54 · 6 answers · asked by Liza 1

Calculate the pH of 10.00 mL of 0.100 M HCL after adding 10.00 mL of indicator solution. Round the pH to three sig figs.

2007-01-08 12:38:02 · 2 answers · asked by nitral2344 1

Does any one know where I can go online for help on chemistry my teacer is kind of dumb, she dnt know what she talks about and when she tries to do chemistry equations she gets confused so please help!!!!!!

2007-01-08 12:35:10 · 2 answers · asked by j v 2

I know you need to use multiple conversion factors, but cant seem to figure this out.

Taken from Glencoe Science Honors Chemistry book

2007-01-08 12:29:43 · 5 answers · asked by Anonymous

asap ig possible

2007-01-08 12:23:48 · 10 answers · asked by spyhawkmpg93 2

Explain why water exists as a liquid at STP, while methane (CH4) exists as a gas, even though their molecular masses are fairly close to each other.

2007-01-08 12:22:12 · 5 answers · asked by queenz_killarep 2

This is a true or false question. The graduated cylinder is 100mL and partially filled with water, but doesn't say how much.

2007-01-08 12:22:00 · 3 answers · asked by Anonymous

2007-01-08 12:15:47 · 5 answers · asked by Scot 2

I am going to be testing VOC removal from water and I can not find whether chlorine is a VOC anywhere on the internet.

2007-01-08 12:15:18 · 4 answers · asked by Ash 1

Can Isopropyl Alcohol increase the combustability of Gasoline?

2007-01-08 12:15:16 · 2 answers · asked by Anonymous

The only reason why I'm asking this question is because of the news items on Comcast. In New York today, they had that horrible odor from natural gas all over the city. They also had that same smell this past summer. In Austin, Texas they had an odor issue and there were 60 birds found dead on one street. My question is for serious chem students or instructors only.

Can the explusion of nerve gas be masked by other odors and if so, does the injection of another chemical render the affects of nerve gas to null?

Had I not read this article, then the thought wouldn't have crossed my mind. However, since I did read them and I'm intelligent in some subjects, this is not my forte' although it has always been an area of interest for me. Also, I'm not a panic person, I just like gathering information for my own self. It is important to me, so I would appreciate a serious answer and an honest one. I don't look for problems, but I'm an analytical person. Thanks for your time.

2007-01-08 12:13:49 · 1 answers · asked by chole_24 5

Which three of the below are homogeneous?

vinegar
smoke
whipped cream
fog
soft drinks
syrup

(the remaining three are heterogeneous)

2007-01-08 12:00:34 · 1 answers · asked by just me 3

Ok so for science my niece had to do a lab. They made a slide for a microscope. The first thing they did was put a drop of wateron the slide then they put the letter e in the slide and they covered it with the coverslip. thing. Then they looked inside the microscope and saw the e magnifized and stuff. But then they moved the slide to the left but when they looked in the microscope it moved right. And then when they had to move the slide up it moved down. Why did that happen.?? I told her it was the mirror that does the opposite but that is wrong do u have any other possible answers please help??

2007-01-08 11:59:46 · 4 answers · asked by Valerie 2

I need to know where I can get the gas and how to inflate it into the balloon.

2007-01-08 11:47:36 · 6 answers · asked by Anonymous

???

2007-01-08 11:44:52 · 2 answers · asked by blue_skies 2

I need as many answers to the following as possible. Thanks!!!
-equation for volume
-SI unit for density
-equation of density
-characteristics of the bonds of the four types of matter
-how would you determine a wave's speed
-what are the two terms used for the columns in the periodic table? how many columns are there?
-What is the term for the rows? how many are there?
-period number of the actinides and lanthanides
-what is the charge of a molecular compound>
-what is magnesium's most common ion? how do you find that?
-what are the bond angles for these molecular shapes: trigonal bent and tetrahedral bent
-what determines whether a compound is polar or not?

Thank you sooo much!!

2007-01-08 11:44:14 · 5 answers · asked by Anonymous

If you scrape off the powder on matches and packed it thightly into a copper pipe with both ends closed thightly using copper caps, would the ignition of match powder (using a fuse) be strong enough to burst through the copper pipe?

2007-01-08 11:38:33 · 5 answers · asked by Sliceathroat 3

a. 1.
b. 2.
c. 3.
d. 4.

2007-01-08 11:36:41 · 1 answers · asked by Anonymous

2007-01-08 11:34:37 · 8 answers · asked by vicky-voos 1

2007-01-08 11:17:35 · 6 answers · asked by Ryan 1

for my chem hw!!! gotta finish ASAP!! thx :)

2007-01-08 11:17:02 · 3 answers · asked by Anonymous

a. changing subscripts.
b. erasing elements as necessary.
c. adding coefficients.
d. adding elements as necessary.

2007-01-08 11:05:48 · 11 answers · asked by Noor 3

Can Fire Burn so hot it turn white?

2007-01-08 11:03:51 · 5 answers · asked by sleppyxl 1

2007-01-08 11:01:10 · 3 answers · asked by justin f 1

2007-01-08 10:59:22 · 5 answers · asked by BeC 2

like how is stuff crystilized like snow?
and whats the factors?
just everything about crystallization
this is for a sceince fair
thanks!

ps links are great too!

2007-01-08 10:50:29 · 1 answers · asked by Anonymous

PLEASE!
1.)In the reaction CaO+CO2-->CaCO3 what is the coefficient for calcium oxide? 1,2,3,or 4?
2.)Pure zinc can be used to "get the lead out" of a solution of lead (II) acetate. This reaction is an example of..? Single Replacement, Double Replacement, Combination, Decomposition?
3.)C(s)+O2(g)-->CO2(g) is an example of? combustion reaction, simple decomposition reaction, simple combustion reaction, single replacement reaction?

please help

2007-01-08 10:46:13 · 3 answers · asked by celtsbball3445 2

Why?

2007-01-08 10:40:55 · 4 answers · asked by piangpiang 2

2007-01-08 10:39:40 · 7 answers · asked by justin f 1

Describe the series of chemical changes sulfur in fossil fuels goes through that may be harmful to plants and creatures that live in aquatic enviroments.

2007-01-08 10:18:13 · 2 answers · asked by ♥Roberta. 5