Chemistry - January 2007

ok im having trouble w my homework and here r sum clues and i dunno this b/c i was sick 1) a physical form which a subtance cab exist the 3rd letter is a have no idea sry 2) because of surface tension liquads form spherical what? first letter is d. 3)a Change of State reaction that ____(blank) energy is endothermic first letter is a and last letter is s

CAN YOU HELP ME OUT PLEASE HERES AND EXAMPLE HOW 2 ANSWER IT 1)______(ANSWER) 2)_______(ANSWER) 3)______(ANSWER) WRITE ANSWER WHERE _____ IS THANKS

2007-01-15 11:02:14 · 1 answers · asked by Anonymous

Convert 50 Kilograms into grams.
.
50___x 1000___/ 1 ___ = 50 000 ___
.
.

Will you do this one and explain how to do it

2007-01-15 10:59:03 · 6 answers · asked by 16m&ms 1

I NEED TO KNOW IF THERE'S ACID IN TOOTHPASTE!! I USED COLGATE TOTAL.

2007-01-15 10:50:16 · 2 answers · asked by Anonymous

2007-01-15 10:46:11 · 2 answers · asked by the real tink gurl 2

Calculate the energy released when 10.0g of steam at 100oC, 1 atm is condensed and cools to 25oC.

2007-01-15 10:42:52 · 1 answers · asked by Special K 1

kinetic energy increases and potential energy decreases?

2007-01-15 10:42:25 · 5 answers · asked by Anonymous

How many elements are there. what was the most recent one to be discovered. What is the limit to possible atomic number, that in theory could be discovered or made artifically?

2007-01-15 10:40:49 · 3 answers · asked by wally 3

Is there folic acid in toothpaste? Please answer! I'm in an emergency and I need the answer quick cuz my science project is due tomorrow!!!!
and I think I made a mistake by putting it down in my notebook!

2007-01-15 10:39:47 · 4 answers · asked by Anonymous

type of bond________polar or non polar
CH3F covalent ____polar
CCl4 covalent___polar
C2H6 covalent___polar
C2H4 covalent_polar
C2H6Ocovalent__polar
C2H2 ionic_polar

2007-01-15 10:38:10 · 2 answers · asked by Ballerina 1

Andy was walking in the rain. The floor was so unstable, Andy slipped and fell.

Independent variable (cause) = the rain
Dependent variable (effect) = Andy slipped and fell

Is this right? Does an independent variable mean "cause"? Does a dependent variable mean "effect"?

2007-01-15 10:34:05 · 4 answers · asked by biancaonwenu 2

This is for a lab in physical science.

2007-01-15 10:31:59 · 3 answers · asked by Anonymous

A SAMPLE A CYANIC ACID, HCN CONTAINS 3.33*10^23
ATOMS. HOW MANY MOLES OF CYANIC ACID ARE IN THE SAMPLE? HINT: FIND THE NUMBER OF MOLECULES FIRST

2007-01-15 10:26:21 · 2 answers · asked by Anonymous

A 2.5 g sample of He is held in a 3.000 L closed container at 20.0 degrees celcius. The temperature is increased to 60.0 degrees celcius. If the final volume is 3.000 L and the final pressure is 1.874 atm, what was the initial pressure of the gas?

2007-01-15 10:15:55 · 5 answers · asked by Anonymous

Will someone please explain nuclear equations to me? I don't get them. When you're bombarding something with particles to make it produce new stuff (in nuclear transformation, I think) How do you get it, the products and the reactants?

2007-01-15 10:13:11 · 3 answers · asked by Coolest person alive 1

I know that the gas constant used in the ideal gas law is 8.31 kPa x L/ mol x K, but does that apply to all gases? Or do some gases have different R values?

2007-01-15 10:04:02 · 4 answers · asked by Anonymous

vessel A was filled with enough air at 25 degree C to give a pressure of 50.0 torr. Vessel A has a volume of 675 ml. Vessel X, of Unknown volume, was connected to vessel A with a stopcock. Vessel X was empty initially (air had been evacuated), so its initial pressure was zero. The stopcock was opened allowing the air to expand at a constant temp and occupy both vessels. The final pressure for the entire system was 16.0 torr. What is the volume of vessel X? Please explain how you got an answer. thanks

2007-01-15 09:58:24 · 2 answers · asked by Angel Eve 6

2007-01-15 09:58:06 · 1 answers · asked by Anonymous

Independent variable = cause
Dependent variable = effect

Is this right? Can these variables be used for any "cause and effect" scenario?

2007-01-15 09:45:00 · 2 answers · asked by biancaonwenu 2

The electron affinity for chlorine has a negative value, indicating that the atom readily accepts another electron. Why does a chlorine atom readily accept another electron?

2007-01-15 09:39:57 · 7 answers · asked by Anonymous

The lattice energy for sodium iodide is 700 kJ./mol, while that for calcium sulfide is 2775 kJ/mol. Which of these salts do you predict has the higher melting point? explain

2007-01-15 09:38:25 · 2 answers · asked by Anonymous

i cant find this anywhere either. name the six functional groups of organic compounds and write their structural formula.

2007-01-15 09:32:55 · 13 answers · asked by uluvme8807 3

2007-01-15 09:15:49 · 6 answers · asked by horsegirl7800 1

helpppppp, please!

Explain, in terms of atomic structure, why the atomic radius of iodine is greater than the atomic radius of fluorine.

i have it at the tip of my tongue, but i don't know how to word it. help?

2007-01-15 09:14:07 · 2 answers · asked by Anonymous

2007-01-15 09:09:54 · 3 answers · asked by Lisa 1

(i cant figure out what i did wrong on this one.)

A)50.0 degrees C
B)15.0 degrees C
C)5.00 degrees C
D)4.00 degrees C

heres what i did:
q=mC(delta)T
1680=80(4.18)x
1680=334.4x
x=5.02...
so i put C, but that was wrong

please show me what to do for this

2007-01-15 09:05:29 · 3 answers · asked by um yea hi 4

A 0.5130 g of aspirn tablet which was dissolved in 95% ethanol required 27.98L of 0.100 M NaOH for neutralization. Then an additional 42.78mL of 0.10M NaOH was added and the solution was heated to hydrolyze the acetylsaclicylic acid. After the reaction mixture was cooled , the excess base was back-titrated with 14.29 mL of 0.1056 M HCl.
a)how many grams of acetylsaclicylic acid are in the tablet?
b)What % w/w of the tablet is acetylsaclicylic acid?

2007-01-15 09:04:05 · 1 answers · asked by SweetAngel 1

2007-01-15 08:54:13 · 7 answers · asked by Anonymous

2007-01-15 08:52:56 · 5 answers · asked by raxer 2

"Relate spectral lines and energy within an atom".
I think they want more than just that they are inversely proportional- I need to know what actually happens in the atom.
It's for a lab report (10th grade).
Please explain!
THANKS

2007-01-15 08:45:32 · 3 answers · asked by sarahg 3

hi, i was wondering if anyone could help me? i have two questions
using this diagram: http://i10.tinypic.com/440exxv.jpg

1) Base your answer on the particle diagrams. Samples A, B, and C contain molecules at STP.

Explain why the average kinetic energy of sample B is equal to the average kinetic energy of sample C.

and using the same diagram:

2) Base your answer on the particle diagrams. Samples A, B, and C contain molecules at STP.

Explain why sample C could represent a mixture of fluorine and hydrogen chloride.


if anyone could help that would be great! :)

2007-01-15 08:39:24 · 2 answers · asked by Madison 1