Chemistry - September 2007

i know melted sugar forms carbon and water.

does salt melt?

what does melted salt form?

2007-09-18 11:05:24 · 1 answers · asked by motoson 4

You wish to defeat Superman for your own nefarious purposes. You have obtained a 4.00 in
diameter sphere of Kyptonite (denisity = 26.7 g/cm3).

2007-09-18 10:30:37 · 1 answers · asked by Anonymous

-Thinking Critically-
When subtracting or adding two numbers in scientific notation, why do the exponents need to be the same?
-Applying Concepts -
You are converting 68 km to meters. Your answer is 0.068 m. Explain why this answer is incorrect and the likely source of the error.

Please help? and thank you!

2007-09-18 10:27:11 · 3 answers · asked by R3B3LL10N 1

arsenic (III) sulfide forms a sol with a negative charge. Which of the following ionic substances should be the most effective in coagulating this sol? KCl MgCl2 Al2(SO4)3 Na3PO4 i am very confused lol

2007-09-18 10:12:06 · 1 answers · asked by Anonymous

a 100g sample of a fertilizer contains .0705 moles of p2o5 and .106moles of k2O how many moles of p and k are in the sample.

please explain how

thanks

2007-09-18 09:21:02 · 4 answers · asked by ilikegcalot 1

If I were to measure the densities of a block using length, width, and height...How would the calculations change if the block was actually hallow?

Im guessing the mass is changed which changes the desnity calculation? Thx..

2007-09-18 09:20:58 · 2 answers · asked by kat 3

Why should the thermometer be above the side arm of the three way collecting tube?

2007-09-18 09:14:29 · 1 answers · asked by Anonymous

V= 4/3(3.14(radiuscubed) The ft need tobe converted to liters before it can be cubed and i'm having a hard time trying to find something to convert ft to Liters. Can anybody help?

2007-09-18 09:05:41 · 2 answers · asked by flo_town02 1

If a distillation exp were done on top of a mountain hopw would the temperature be affected and why?

2007-09-18 09:00:50 · 3 answers · asked by Anonymous

-What fire triangle factor does this remove from the frying pan fire?
-Why do you never put water on a fyring pan fire?

2007-09-18 08:44:13 · 11 answers · asked by MaeMae 1

What mass of cesium chloride must be added to 0.565 L water to produce a 0.355 m solution? (Assume d of H2O = 1.00 g/mL.)
_________g

What are the mole fraction and the mass percent of CsCl?

2007-09-18 08:24:40 · 1 answers · asked by Anonymous

You drink 350 mL of diet soda that is at a temperature of 5 °C.
(a) How much energy will your body expend to raise the temperature of this liquid to body temperature (37 °C)? Assume that the density and specific heat capacity of diet soda are the same as for water.
(b) Compare the value in part (a) with the caloric content of the beverage. (The label says that it has a caloric content of 1 Calorie.) What is the net energy change in your body resulting from drinking this beverage?
(c) Carry out a comparison similar to that in part (b) for a nondiet beverage whose label indicates a caloric content of 240 Calories.

Help, pleeeease!!

2007-09-18 08:14:13 · 1 answers · asked by Anonymous

(a) CsCl(s) in H2O(l)
dipole-dipole forces
dipole-induced dipole forces
dispersion forces
hydrogen bonds
ion-dipole forces
(b) N2(g) in C4H10(g)
dipole-dipole forces
dipole-induced dipole forces
dispersion forces
hydrogen bonds
ion-dipole forces
(c) CH3Cl(g) in CH3OCH3(g)
dipole-dipole forces
dipole-induced dipole forces
dispersion forces
hydrogen bonds
ion-dipole forces



please help

2007-09-18 07:20:18 · 3 answers · asked by Anonymous

ehhhhhhhhhhhh

2007-09-18 06:56:24 · 6 answers · asked by Anonymous

How many atoms are present in a 9.78-m lenth of 20-gauge copper wire? A 20-guage copper wire has a diameter of 0.03196 in. and the density of copper is 8.92 g/cm^3

help?

2007-09-18 06:55:53 · 2 answers · asked by mike g 1

How does salt get an ice-water mixture to be colder? I mean... I use salt to melt ice on the road in the winter time. Salt to bring ice at a higher temperature so, it's in a state of liquid form and not solid. I could never figure this out.

2007-09-18 06:33:52 · 2 answers · asked by Anonymous

Two samples, A and B, of equal mass are placed ina graduate cylinder containing 5.00 mL of water. A dislaces twice as much water as sample B. Which sample is more dense? By how much?

____
I'm guessing sample A??

2007-09-18 06:32:08 · 6 answers · asked by kat 3

A 0.4230 g sample of impure sodium nitrate (contains sodium nitrate plus inert ingredients) was heated, converting all the sodium nitrate to 0.2292 g of sodium nitrite and oxygen gas. Determine the percent of sodium nitrate in the original sample.

sodium nitrate in the original sample =__________%

I'm having I very tough time with this problem, can someone pleeze help me! I hate Chemistry, it's so hard :(

2007-09-18 06:30:15 · 2 answers · asked by Anonymous

The denisty of sulfur is 2.07 g/cm^3. How Many S atoms are there in 4.48 cm^3 of sulfur sample?


If S atoms are joined into S8 molecules in the sample, how many S8 molecules are there in the sample?


How do i do this???

2007-09-18 06:26:00 · 2 answers · asked by mike g 1

pleeeeeeeeeeeeeeeaaaaaaaaaaase help, needs answering by tomorrow, 19th september.
thankyou sooooooooooo much.

2007-09-18 06:25:54 · 1 answers · asked by loopylittlelisa 1

2007-09-18 06:18:59 · 4 answers · asked by Anonymous

Does anyone know how to describe the structure of the glucose molecule and what the shape is about?

2007-09-18 06:17:18 · 1 answers · asked by chandakay05 1

We did a lab and we put a piece of zinc in hydrochloric acid, placed our thumb over the test tube for one minute, then put a piece of burning splint is over it. I don't understand WHY the chemical change happened. please help me!

2007-09-18 06:12:03 · 2 answers · asked by Stephanieeexoxo 2

2007-09-18 06:01:40 · 7 answers · asked by Anonymous

2007-09-18 06:00:11 · 3 answers · asked by Anonymous

How many mass molecules are there and how would i draw them (web link would be greatly appreciated)

2007-09-18 05:59:27 · 1 answers · asked by Anonymous

I have to compare modern methods of extracting iodine and chlorine. I know that chlorine is extracted by electrolysis and iodine is vapourised and condensed but what are the reasons for these particular methods relating to the chemistry of chlorine and iodine? any help would be greatly aprechiated and 10 points to the answer that helps me the most! thanks!

2007-09-18 05:58:42 · 1 answers · asked by jono 2

2007-09-18 05:36:56 · 2 answers · asked by Anonymous

Hypothetical element X has 3 stable isotopes. The relative peak intensities are 57.66 for 180.0 u, 100.0 for 184.0 u, and 84.10 for 186.0 u. What is the average atomic mass for X?

2007-09-18 05:35:03 · 3 answers · asked by Anonymous

Question 1 (1 point)
Chlorine has two stable isotopes of mass 34.97 u and 36.97 u. Suppose the percent abundance of the lighter isotope were 64.75%. What would be the atomic mass of Cl? (The actual abundance is 75.77%.) I need the procces to get to the answer

2007-09-18 05:31:58 · 4 answers · asked by Anonymous