Chemistry - January 2007

2007-01-15 08:38:07 · 7 answers · asked by raxer 2

Not from the grocery store or in bleach.
You will not get points from dumb answers!

2007-01-15 08:37:55 · 7 answers · asked by Arturo H 1

2007-01-15 08:29:39 · 11 answers · asked by bleu 4

What is the answer to:

c2h7oh -> H2O + CO2

and how did you get it?
thanks!

2007-01-15 08:23:11 · 3 answers · asked by Julie H 2

2007-01-15 08:18:56 · 2 answers · asked by norcalgoldmine 1

My car has a 13.7 gallon tank. Assuming that gasoline is entirely made from octane(C8H18), how many POUNDS of CO2 would be froduced from my car each time I use a tank of gas? How many pounds of CO2 will produce from my car each year(I drive 21,500 miles each year)?
Some equalities you may find useful
- 1 lbs- 4536 kg
1 kg-2.205 lbs.
28.35g-3.785 liters
l inch-2.54 cm
density of octane-.855g/ml
my car averages 29.7 miles/gallon

use the following equation
C8H18 + 12 1/2 O2 --> 8 CO2 + 9H2O
if u can find the answer and show work, it would be greatly appreciated. Please hlp. thx It would be nice if u can show step by step using factor labeling or something. Please show work, and if steve sees this he didnt answer both parts

2007-01-15 08:18:56 · 3 answers · asked by coolphill517 1

I've read about how bread becoming toast is a chemical change/reaction, but I don't know why. Can someone please explain this for me? =]

2007-01-15 08:04:46 · 5 answers · asked by Anonymous

Heres some riddle for all them science nerds out there! sry if u dont like to be called nerds, i'm a science nerd and dont really mind it haha

-i am a nonmetal that has 4 valence electrons, properties similar to carbon, and an atomic mass slightly less than phosphorus.what is my identity what element am i?

- I am an element that has 5 valence electrons, i show properties of metals and non-metals and i have 33 protons in the nucleus of each atom what is my identity, what element am i?

-I am a highly active metal that has 1 valence electron and 55 protons in the nucleus what's my identity what element am i?

get 2/3 right or 3/3 right and you will be selected as best answer!! and recieve 10 points! fortuna bona! wale!
good luck, so long!

2007-01-15 08:04:44 · 2 answers · asked by !¿question!? 2

[i got this wrong on a test and i would like to know what the correct answer is and how to get it]

A)9.54J
B)146J
C)11,700J
D)79,100J

this is what i did
q=mC(delta)T
x=35.0(4.18)(273)
but i didnt even get one of the answers. i put A, but that was wrong.
help??

2007-01-15 08:01:54 · 2 answers · asked by um yea hi 4

Does the independent variable=cause and dependent variable=effect?

2007-01-15 08:00:44 · 2 answers · asked by biancaonwenu 2

Also I have been told that cold water comes to a boil faster than hot water, is this true? If yes, why?

2007-01-15 07:59:44 · 2 answers · asked by Anonymous

...

2007-01-15 07:56:53 · 11 answers · asked by Austin L 1

Also, can you give me some chemical changes/reactions. Thanks! =]

2007-01-15 07:44:51 · 1 answers · asked by Anonymous

What is the molar solubility in water of Ag2CrO4? (The Ksp for Ag2CrO4 is 8 x 10^-12)
-------------------------
What is the final concentration of barium ions, [Ba{2+}] in a solution when 100 mL of .10M BaCl2 is mixed with 100 mL of 0.050 M H2SO4?
---------------------------
When 100mL of 1.0M Na3PO4 is mixed with 100 mL of 1.0M AgNO3, a yellow precipitate forms and [Ag+] becomes negligibly small. Rank the ions renmaining in solution in order of increasing concentration. [Na{+}] [NO3{-}] [PO4{3-}]
------------------------
Could you be thorough with the explaination?

2007-01-15 07:43:19 · 3 answers · asked by Neodudeman 1

I know calcium is one, what are some others?

2007-01-15 07:19:19 · 9 answers · asked by firenzez1977 1

2007-01-15 07:07:17 · 4 answers · asked by Justin 1

My car has a 13.7 gallon tank. Assuming that gasoline is entirely made from octane(C8H18), how many POUNDS of CO2 would be froduced from my car each time I use a tank of gas? How many pounds of CO2 will produce from my car each year(I drive 21,500 miles each year)?
Some equalities you may find useful
- 1 lbs- 4536 kg
1 kg-2.205 lbs.
28.35g-3.785 liters
l inch-2.54 cm
density of octane-.855g/ml
my car averages 29.7 miles/gallon

use the following equation
C8H18 + 12 1/2 O2 --> 8 CO2 + 9H2O
if u can find the answer and show work, it would be greatly appreciated. Please hlp. thx It would be nice if u can show step by step using factor labeling or something

2007-01-15 07:01:13 · 2 answers · asked by coolphill517 1

[i got this wrong on a test and i just wanna know what the correct answer is and why]

A)equal masses and the same number of molecules
B)different masses and a different number of molecules
C)equal volumes and the same number of molecules
D)different volumes and a different number of molecules

[i put B but that was wrong]

2007-01-15 07:00:50 · 1 answers · asked by um yea hi 4

how do i draw this..........using a chromosome number of 2 in parent cell draw cell cycle 2....and ......using a chromossome number of 5 in parent cell draw steps of cell cycle 1.....thx

2007-01-15 06:59:31 · 1 answers · asked by Anthony V 1

how do i draw this..........using a chromosome number of 2 in parent cell draw cell cycle 2....and ......using a chromossome number of 5 in parent cell draw steps of cell cycle 1.....thx

2007-01-15 06:58:56 · 1 answers · asked by Anthony V 1

i need to know if pcb was band from sale or if i can still get it. and where.
i heard that raido shack had it " if so why" and if i can not get it any where does any one know how to synthizace it some one please help.

2007-01-15 06:58:13 · 1 answers · asked by uvphoenix 1

and WHY?

2007-01-15 06:50:27 · 6 answers · asked by Anonymous

If it helps, the actual yield is 1.55 cm, and I need the theoretical yield in moles.

I appreciate any help

2007-01-15 06:47:19 · 4 answers · asked by Random G 3

2007-01-15 06:44:39 · 6 answers · asked by tennisbarby 1

2007-01-15 06:43:29 · 2 answers · asked by Anonymous

complete the word equation for the reaction between calcium carbonate and sulphuric acid.

calcium + sulphuric acid ---> ? + ? + water
carbonate

2007-01-15 06:33:40 · 5 answers · asked by ollie low 2

Our contractor spread rock salt to de-ice the roads and I was wondering if the rain we continued to get melted the ice? They spread more rock salt within a 24 hour period.

2007-01-15 06:32:09 · 5 answers · asked by STEPHANIE M 1

My car has a 13.7 gallon tank. Assuming that gasoline is entirely made from octane(C8H18), how many POUNDS of CO2 would be froduced from my car each time I use a tank of gas? How many pounds of CO2 will produce from my car each year(I drive 21,500 miles each year)?
Some equalities you may find useful
- 1 lbs- 4536 kg
1 kg-2.205 lbs.
28.35g-3.785 liters
l inch-2.54 cm
density of octane-.855g/ml
my car averages 29.7 miles/gallon

use the following equation
C8H18 + 12 1/2 O2 --> 8 CO2 + 9H2O
if u can find the answer and show work, it would be greatly appreciated. Im a chem teacher and a student gave this prob. to me. If i get stumped by my student, they may treat me w/ less respect. Please hlp. thx

2007-01-15 06:27:43 · 3 answers · asked by coolphill517 1

My friend and I are working on our science fair project and we need a good name for our lab. We tested to screws to see which kind would be resist rust and corrosion. We used galvanized steel, zinc, copper, and steel. If you have any good titles leave them here.

2007-01-15 06:24:23 · 2 answers · asked by nikkigurl232004 2

salt (or are attached to amino acids - chelates) and increase body pH through a series of chemical reactions they become a part of as they pass from food, from the digestive system into the blood and into cells, causing a release of hydroxide ions or binding up hydrogen ions, both of which increase the concentration of hydroxide ions in the body.

2007-01-15 06:21:25 · 2 answers · asked by Lisa 1