Chemistry - October 2007

2007-10-01 16:38:49 · 5 answers · asked by SICK MY DUCK! 1

2007-10-01 16:27:45 · 3 answers · asked by Anonymous

The mass of a cube of iron is 355g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead which has the same dimensions?

I don't understand the wording of the problem....And how do I calculate this? Please be clear, don't just show a few numbers

2007-10-01 16:12:50 · 1 answers · asked by Anonymous

Which of the following ions occurs commonly?
N3+
S6+
O2-
Ca+
Cl+

2. Sodium hydroxide, also known as caustic soda, is used to neutralize acids and to treat cellulose in making of cellophane. Calculate the number of moles of solute in 1.875 L of 1.356 M NaOH solution.
2.543 mol
1.383 mol
0.7232 mol
0.3932 mol
0.001383 mol

3. How many mL of concentrated nitric acid (HNO3, 16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution?
32.0 mL
62.5 mL
125 mL
250. mL
500. mL

2007-10-01 16:12:15 · 1 answers · asked by Anonymous

Specifically when you mix it with water and red cabbage juice (cyanidin?).

2007-10-01 15:43:36 · 1 answers · asked by The Phat Whale 3

2007-10-01 15:31:13 · 3 answers · asked by kwikee m 1

Balance the following equations, using the oxidation number method, and enter the coefficients in the boxes. The coefficients must be the smallest possible integers.
All boxes must contain an entry.
NO3- + Al + H2O + OH- NH3 + Al(OH)4- + H2O + OH-

Note that neither H2O nor OH- should appear on more than one side of the equation. Thus, some of the coefficients above must be 0.

Tries 0/5
PH3 + CrO42- + H2O + OH- P + Cr(OH)4- + OH- + H2O

Note that neither H2O nor OH- should appear on more than one side of the equation. Thus, some of the coefficients above must be 0




I kept trying to do this until I just couldn't. I can't get it please help me in anyway.

2007-10-01 14:50:12 · 1 answers · asked by Student 1

Composition of a Mixture by Acid-Base Titration

A 1.00-g solid sample containing a mixture of table salt (NaCl) and citric acid (H3C6H5O7, a triprotic acid) is dissolved in 15 mL of water.
Titration of the acid solution requires 14.90 mL of 0.3196 M NaOH solution to reach the endpoint.
Calculate the mass percent H3C6H5O7 in the solid mixture.



I don't care when you answer... even till next week... but please just help.. I don't get it =(

2007-10-01 14:42:50 · 2 answers · asked by Student 1

HC2H3O2 + NaOH ---> ???

2007-10-01 14:33:37 · 6 answers · asked by sally 2

how do i figure out how many electrons and neutrons are in an element

2007-10-01 14:27:25 · 2 answers · asked by corndog 1

how do i figure out how many electrons and neutrons are in an element

2007-10-01 14:27:04 · 2 answers · asked by corndog 1

2007-10-01 14:21:47 · 2 answers · asked by soul1er 1

2007-10-01 14:19:10 · 1 answers · asked by Anonymous

please show work

2007-10-01 14:18:09 · 2 answers · asked by Anonymous

2007-10-01 14:14:42 · 2 answers · asked by Anonymous

Na2O
CaCl2
Cl2O
CsCl
Al2O3

2007-10-01 14:10:14 · 3 answers · asked by Jeff W 1

BaOH + HF --> ___ + ___

What is the name of this reaction?

A) single displacement
B) dehydration synthesis
C) acid base
D) decomposition



Which agent will give up the hydrogen ion?

2007-10-01 14:09:30 · 3 answers · asked by Anonymous

How many grams of H2 will be produced when 1.00 g of Mg is added to a
250. mL sample of 0.500 M HCl?
Mg+2HCl--->MgCl2+H2

2007-10-01 14:06:50 · 1 answers · asked by confusedkid 3

what is formed between 1-pentanol + acetic acid?

2007-10-01 14:06:42 · 2 answers · asked by Anonymous

10g of a fuel are burned under a calorimeter containing 200g of H20. The temperature of water increases from 15°C to 55°C. Calculate the total heat produced (in joules) and the heat of combustion per gram of fuel.

THANK YOU!

2007-10-01 13:43:45 · 2 answers · asked by carsmithol 2

...to reduce 23.3 mL of a 0.374 M KMnO4 solution according to the following equation?

10 HI + 2 KMnO4 + 3 H2SO4 5 I2 + 2 MnSO4 + K2SO4 + 8 H2O

Can I please get some help from the chemistry people here?

2007-10-01 13:21:16 · 1 answers · asked by jtaylor 1

The actual boiling point of octane is 125.7C. Calculate the error and the percent error. Need help! Thanks

2007-10-01 13:06:38 · 1 answers · asked by Sun 1

A. 1
B. 2
C. 3
D. 4

2007-10-01 12:26:49 · 1 answers · asked by matterized 1

"a Tums tablet (active ingredient: CaCO3) was dissolved in 25mL 0.6M HCL. It required 6 mL 0.6M NaOH to reach the titration's equivalence point."

the balanced equation for the reaction is CaCO3 + 2HCl --> CaCl2 + H2CO3

Where I'm stuck:
-Calculate the millimoles of HCl that reacted with the CaCO3

-Determine the mass (in mg) of CaCO3 in the Tums tablet


Thanks for any help!

2007-10-01 11:44:28 · 1 answers · asked by Anonymous

What family of organic compunds dissolves in dilute aqueous acid?

2007-10-01 11:32:46 · 1 answers · asked by Dice 1

Give the names of the following compounds:

1.) Al203 = dialuminum trioxide right guys? I have no clue. I tried to work them out on my own, but I would like other people's input.

2.) Ammonium hydroxide =

3.) Bismuth(3)chloride =

4.) Copper(2)sulfate =

5.) Silver carbonate =

6.) Sodium bicarbonate =

7.) Tin(4)oxide =

8.) (NH4)2S=

9.) NiF2=

10.) H2S04(aq)=

11.) K2Cr2O7=

12.) Calcium cyanide=

13.) Copper(1)sulfide=

14.) Sb(ClO3)3=

15.) KCN=

16.) Formula for Ammonia=

17.) Aluminum fluoride=

18.) Chloric acid=

19.) Arsenic (3) oxide=

20.) Chromium (3) sulfite=

21.) Pb(HCO3)2=

22.) Ni(MnO4)2=

23.) AgC2H3O2=

24.) Arsenic (3) iodide=

25.) Titanium (4) bromide=

Thank You!

2007-10-01 11:08:05 · 2 answers · asked by danie 2

can you tell if it is a compound or a mixture? Explain.
you cant right? but i dont know how to explain

2007-10-01 10:56:56 · 8 answers · asked by Anonymous

I love science but one thing has always bugged me about chemistry. How in the world is it even possible for Oxygen to have an atomic weight of 15.9994 which is LESS than 16? Every other element has a weight equal to its number of protons and neutrons. (Or more if it is an isotope.) Is there some rare form of Oxygen (O 15) where it actually has one less neutron and is a lighter isotope? This is the only possible explanation I can come up with. I realize that Hydrogen (Protium) has only a proton and is missing its neutron. (Then there are the 2 heaver forms, Duterium and Tritium.) But other than Hydrogen there are NO other examples in the whole periodic table where there is a lighter isotope (missing a neutron) other than that. If this is NOT the reason why Oxygen has a weight less than 16.0000 please tell me WHY is does? Thank you very much.

2007-10-01 10:55:01 · 3 answers · asked by Becky 3

(for example a cyanin solution)

2007-10-01 10:09:49 · 2 answers · asked by chemistrygal 1

2007-10-01 10:09:24 · 4 answers · asked by abigail s 1