Chemistry - September 2007

i missed the day where we learned
whats the answer to
If you have 900 g of water, how many mL do you have?

What is the density of water in g/cm3?

What is the density of water in g/mL?

2007-09-23 07:19:28 · 3 answers · asked by dana 2

When flour mixed with Iodine / Lugol's, the flour turned purple on contact, but why did this happen? The flour and Iodine were mixed inside a test tube with water, although I don't think this info would be necessary.

So...

Why does flour turn purple when mixed with Iodine?

2007-09-23 07:15:04 · 1 answers · asked by UnknownD 6

Isoctane Balanced Equation: C8H18 + 11O2 --> 8CO2 + 6H2O

Assuming gasoline is 100% isoctane with density 0.692 g/mL. What is the theoretical yield of carbon dioxide produced by the combustion of 1.2 * 10^10 gal gasoline (approx. annual consumption of gasoline in U.S)?

2007-09-23 06:16:21 · 2 answers · asked by choco 1

2007-09-23 06:09:23 · 11 answers · asked by Anonymous

2007-09-23 06:08:22 · 7 answers · asked by josh s 1

I know an endothermic reaction is when heat is absorbed, but is that a chemical or a physical reaction? Please help me be less confused about science!

Thank You!

2007-09-23 05:51:14 · 6 answers · asked by Hello! 3

2007-09-23 05:37:04 · 2 answers · asked by Lady_GaGa.luvr! 4

What exactly is it, dry ice.

Ice that's dry?? And why does it make lots of misrt in the school toilets if you drop one down?

2007-09-23 04:44:43 · 3 answers · asked by stevey226 4

please help me on these give the structural formula and name of the alcohol
ethanoic acid,ch3c02h
propanone-ch3coch3
propanal-ch3ch2cho
hexan-2-one-ch3(ch2)3coch3
cyclohexanone
benzoic acid

2007-09-23 03:58:38 · 2 answers · asked by Anonymous

Really, the simplest questions have the most complicated - and vaguest - answers.

2007-09-23 03:21:16 · 2 answers · asked by Anonymous

what is the difference between the alkali metals and the alkali eart metals....(column 1 and 2)

2007-09-23 03:15:13 · 4 answers · asked by Komodork 3

2007-09-23 02:53:59 · 3 answers · asked by angel 2

Salt is placed in water in an oven, and when it comes out, the salt is in huge chunks. Is this a physical or a chemical change?

2007-09-23 02:43:36 · 3 answers · asked by Celine 1

2007-09-23 02:43:17 · 2 answers · asked by Anonymous

If there is insufficient air flow to the flame, what color is it? Why?

2007-09-23 02:26:33 · 6 answers · asked by kenya nicole 1

a standard solution of glucose contains 100mg of glucose per ml.1/50 dilution of this standard would contain how much glucose per ml?

2007-09-23 02:08:02 · 3 answers · asked by hiv 1

Paticualy the removal of silicates using calcium carbonate

2007-09-23 02:06:16 · 1 answers · asked by My pic looks good 2

2007-09-23 01:40:51 · 3 answers · asked by sana h 1

a. The physical and chemical properties of a compound are usually very different from those of the elements from which it is formed.

b. Only the physical properties of a compound are usually the same as those of the elements from which it is formed.

c. Only the chemical properties of a compound are usually the same as those of the elements from which it is formed.

d. The physical and chemical properties of a compound are usually the same as those of the elements from which it is formed.

2007-09-23 01:25:52 · 3 answers · asked by ♥ 6

2007-09-22 22:13:27 · 5 answers · asked by farnush a 1

2007-09-22 21:56:44 · 3 answers · asked by Anonymous

2007-09-22 21:52:36 · 3 answers · asked by Anonymous

Styrene has 92.26% of Carbon and 7.74% of Hydrogen. Further experimentation determines that the molecular weight of this compound is 78.11 grams per mole. What is the molecular formula of styrene?

2007-09-22 20:17:47 · 2 answers · asked by Mango 1

2007-09-22 17:19:48 · 2 answers · asked by cutie_E 2

Many metals react with oxygen gas to form the metal oxide. For example, calcium reacts in the following manner.
2 Ca(s) + O2(g) 2 CaO(s)

You wish to calculate the mass of calcium oxide that can be prepared from 4.07 g Ca and 2.55 g O2.
(a) How many moles of CaO can be produced from the given mass of Ca?
_______ mol

(b) How many moles of CaO can be produced from the given mass of O2?
_____ mol
(c) Which is the limiting reactant?
Calcium or Oxygen

(d) How many grams of CaO can be produced?
______ g

2007-09-22 17:12:20 · 1 answers · asked by Hector R 1

/BEG prob_val=1
If a 0.120 mole sample of this same compound has a mass of 13.93 g what is the molecular formula of this compound?

2007-09-22 16:16:19 · 1 answers · asked by physicsisgay 2

A 20 g piece of iron with T = 300 °C is placed in 250 mL of water in a glass beaker with T = 30 °C. What is the final temperature of the water and iron at thermal equilibrium assuming that qwater = -qiron ? The specific heat capacity of iron is 0.451 J g-1 °C-1.
A: 270°C
B: 330°C
C: 32.31°C
D: 27.65°C
E: 165°C

2007-09-22 16:13:13 · 1 answers · asked by Peter G 3

i'm not very good at math at all, and i'm not good at science. i can't find how to do this in my book, so can someone please tell me how to do this? Thanks to those that answer! i really appreciate it. :)

"Hydrogen and oxygen react chemically to form water. how much water would be formed if 4.8 grams of hydrogen reacted with 38.4 grams of oxygen?"

2007-09-22 15:52:29 · 1 answers · asked by Ska Baby 2

2007-09-22 15:43:59 · 5 answers · asked by Anonymous

2007-09-22 15:35:58 · 2 answers · asked by soul2true 1