Chemistry - January 2007

A piece of lead having a mass of 143.5 g is placed in an empty graduated cylinder.
34.0 mL of water is then poured slowly and carefully into the same cylinder.
The final water level would then indicate the total volume of the materials in the graduated cylinder.
What is this total volume in millileters?

2007-01-29 11:16:39 · 2 answers · asked by jeniferrrr 1

2007-01-29 11:05:41 · 2 answers · asked by CDinsky 1

If 6.214x10^24 molecules of P2S5 reacts with 16.4 grams of H20 and 4 moles of O2, what masses of phosphoric and sulfuric acid will be formed?(need balanced eq also)

If only 12 grams of phsphoric acid are formed, what is the percent yield? How many grams of each excess reactant are leftover?

2007-01-29 11:05:06 · 3 answers · asked by Joann 2

2007-01-29 11:02:36 · 2 answers · asked by jirureanu,.,., 1

Titanium
Density is 4.50 g/ml

2007-01-29 11:02:27 · 1 answers · asked by jeniferrrr 1

Thank you very much for the help!

2007-01-29 10:47:40 · 3 answers · asked by jame2226 1

2007-01-29 10:45:15 · 1 answers · asked by nitin p 1

10-3 m3 = 1 L

2007-01-29 10:43:26 · 3 answers · asked by jeniferrrr 1

2007-01-29 10:39:43 · 1 answers · asked by nicegoal27 1

2007-01-29 10:33:28 · 6 answers · asked by Vance's girl 2

Given the following data:


Fe3O4 + CO → 3FeO + CO2 DH = +38 kJ


2Fe3O4 + CO2 → 3Fe2O3 + CO DH = +59 kJ


Fe2O3 + 3CO → 2Fe + 3CO2 DH = −28 kJ




Calculate DH for the reaction


FeO + CO → Fe + CO2


Enter a numeric answer only.

2007-01-29 10:04:34 · 1 answers · asked by Marty Kay 2

I have a friend who wants to use this to protect finger nails.

2007-01-29 09:58:59 · 2 answers · asked by miss tique 3

I'm in tenth grade chemistry and I'm trying to find it's molar mass and chemical formula.

2007-01-29 09:49:24 · 5 answers · asked by chjuem 1

i have already asked this question..but can anyone give me a detailed answer?

2007-01-29 09:42:43 · 3 answers · asked by carolyn 3

The carbon deposits are inside the heat exchanger of a central heating boiler. Hence the need for a liquid solution.

2007-01-29 09:38:35 · 4 answers · asked by Anonymous

If the rate law for a reaction is rate = k[A][B] (both first order), and they both have a concentration of .02 M, the rate after 25% of B has reacted is what percent of the inital rate?

Could you explain how you got the answer? thanks (my main focus is trying to learn how to do it :) )

2007-01-29 08:53:26 · 3 answers · asked by Anonymous

2007-01-29 08:48:08 · 4 answers · asked by LP 1

cooled to 14 C, How many grams of phthalic acid would crystallize out?

2007-01-29 08:27:54 · 2 answers · asked by Anonymous

why does the amount of gas and temperature have to remain constant in order for pressure and volume to be directly proportional, or when testing the relationship between vol. and press.?

i'm reviewing for a test. ahhhhhh!


thank youuuuu.

2007-01-29 08:18:50 · 3 answers · asked by alexie. 4

2007-01-29 08:10:10 · 2 answers · asked by Anonymous

2007-01-29 08:07:27 · 6 answers · asked by homiecharms 1

Would this have something to do with kinetic energy/theory?

2007-01-29 08:07:16 · 5 answers · asked by alexpaolella 1

Okay so there was this chemist named wohler now i have a few questions about him
1) What is his first name
2) WHat did he do
3 can u give me a good site about him?

2007-01-29 08:02:44 · 3 answers · asked by Thank you 1

Given the following data:


2Mg + O2 → 2MgO Delta = −1204


MgO + H2O → Mg(OH)2 Delta H = −37


2H2O → 2H2 + O2 Delta H = +572 kJ

2007-01-29 07:55:18 · 1 answers · asked by simonkf2002 1

2007-01-29 07:50:53 · 2 answers · asked by homiecharms 1

2007-01-29 07:38:36 · 5 answers · asked by Skittles 2

1. Na+1 + I-1
2. H+1 + H-1
2C+4 + O-2

2007-01-29 07:19:53 · 2 answers · asked by Anonymous

2007-01-29 07:12:24 · 5 answers · asked by garou_yasha 2

oook so..

- If CO2 amd H2O are formed when compound 'x' is burned, which two elements must be present in 'x'?

andd

- Some coals and oils contain sulphur impurities. Which harmful gas is formed when these fuels are burned?

Pleasee help guys, would be much appreciated x x x

2007-01-29 07:05:27 · 13 answers · asked by Anonymous

2007-01-29 07:03:06 · 2 answers · asked by ardy-boy 2