Chemistry - August 2007

what happens when you drop vinegar into milk

2007-08-27 11:10:14 · 2 answers · asked by CaRoLiNe 3

explain how you know???

2007-08-27 11:09:52 · 4 answers · asked by sweetlilme17 2

A compound contains only carbon, hydrogen, nitrogen, and oxygen. Combustion of 0.157 g of the compound produced 0.213 g CO2 and 0.0310 g H2O. In another experiment, it is found that 0.103 g of the compound produces 0.0230 g NH3. What is the empirical formula of the compound? Hint: Combustion involves reacting with excess O2. Assume that all the carbon ends up in CO2 and all the hydrogen ends up in H2O. Also assume that all the nitrogen ends up in the NH3 in the second experiment.

I know the answer, C7H5N3O6, but i don't know how to find it. help, please?

2007-08-27 11:04:07 · 2 answers · asked by Megan 1

16) Fe2O3 + H2 ----> Fe +H2O
17) PbO2 + CO ----> Pb + CO2
18) Al + Fe2O3 ----> Fe + Al2O3
19) Fe3O4 + C ----> Fe + CO2
20) H20 + Co ----> H2 + CO2

can anyone help solve balancing these equations, i'm really confused. Very apreciated :D

2007-08-27 11:03:23 · 3 answers · asked by **Lilyanne** 3

325 kg
0.00046
7104
0.0028


------------------------------------------------

find the number of signigicant digits in each of the following

0.00326
39010
77900.1
1.5300

2007-08-27 10:47:12 · 2 answers · asked by Anonymous

C6H12O6------->CO2 +H2O

2007-08-27 10:46:37 · 4 answers · asked by Nikki C 1

I am refering to the procedure in the United Kingdom.

2007-08-27 10:27:17 · 4 answers · asked by Nirmala 4

In a text there is a note saying that Na2 must be written as 2Na not Na2 (subscript). I don't understand why as it is the same thing. Any help would be appreciated

2007-08-27 10:16:43 · 2 answers · asked by Gideon 1

In a text it states that the following equation

Na2CO3(aq)+Cu(s)-->Cu(s)CO3(s)+2Na

with a note saying that Na2 must be written as 2Na not Na2 (subscript). I don't understand why as it is the same thing. Any help would be appreciated

2007-08-27 10:14:18 · 2 answers · asked by Gideon 1

It is fairly common to find that at some definite composition, two substances form an eutectic mixture. For example, 1-naphthol melts at 95.5 Celcius and naphthalene melts at 80.5 Celcius. When mixtures of varying composition of these two substances are prepared it is found that the lowest melting point is obtained with a mixture consisting of 60.5 mol % naphthalene and 39.5 mol % of 1-naphthol. Such a mixture melts sharply at 61.0 Celcius. As this eutectic mixture melts, the composition of the melted mixture and the composition of the solid mixture remain unchanged, and as a consequence the melting temperature is constant. In terms of its melting point, such a mixture behaves like a pure substance. Given a sample of this eutectic mixture, how could you prove that it is not a pure substance? What would you do and what would you observe?

2007-08-27 09:56:11 · 2 answers · asked by Anonymous

If a calorie is the energy needed to increase the temperature of 1 gram of water by 1 °C, then why is it all over food products? And why are there more calories in certain foods than others? Why is more calories bad?

2007-08-27 09:37:49 · 9 answers · asked by gocougars1992 2

how do you do these?

14) NH3 + H3PO4 ----> (NH4)3PO4
15)NH3 + O2 ----> N2 + H2O
16) Fe2O3 + H2 ----> Fe +H2O
17) PbO2 + CO ----> Pb + CO2
18) Al + Fe2O3 ----> Fe + Al2O3
19) Fe3O4 + C ----> Fe + CO2
20) H20 + Co ----> H2 + CO2

and the numbers are meant to be small but i can't do them like that? so does any one know how to do these? I really really need help, very apreciated :D

2007-08-27 09:34:33 · 2 answers · asked by **Lilyanne** 3

determine the grams of ethylene glycol(c2h4(oh)2) which must be dissolved in 2500 g of water to make a 4.78 m solution

2007-08-27 09:34:31 · 5 answers · asked by louis h 1

can anybody help me with this equation please?


What mass of ethylene glycol (C2H6O2, molecular weight 62.1) must be added to 10.0
L of water to produce a solution for use in a car’s radiator that freezes at -23.3 °C?
(The density of water is 1 kg L-1. The molal freezing point depression constant for
water, Kf, is 1.86 °C kg mol-1)

how the f*ck do you do this?? its driving me crazy! can anyone give me a formula or something? please?! im goin outta my mind!


and before i get the "do your own homework" crap, its not homework, im trying to revise and im asking for help :]

2007-08-27 09:34:24 · 2 answers · asked by Anonymous

the fermentation of glucose to produce ethyl alcohal maybe by the
equation C6H12O6 ------ C2H5OH* CO2 must be balenced
determine the grams of gulcouseC6H12 O6 required to produse 500mL of 2.5 Methyl alcohal c2 h5 oh

2007-08-27 09:09:42 · 1 answers · asked by louis h 1

or neither? : S
context - attached to a very large humus molecule

2007-08-27 08:08:21 · 6 answers · asked by Anonymous

2007-08-27 06:44:05 · 1 answers · asked by Yoshi 3

it is a mix of BASO4 AND ZnS

2007-08-27 06:00:39 · 8 answers · asked by Anonymous

1)What does it mean when chemists say that a reactant is reduced?

2)what does it mean when chemists say that a reactant is a reducing agent?

3)Is francuim likely to be reduce in a chem. reaction?would it be easy or difficult to separate francium ores?Explain.

Oxidation or Reduction?
1)Na--> Na+ +e-
2)Cl + e- --> Cl-

2007-08-27 05:51:53 · 5 answers · asked by Anonymous

Assuming ideal behavior, how many grams of acetylene are in the tank?

A. 4.33 g
B. 6.01 g
C. 113 g
D. 1650 g

2007-08-27 04:44:52 · 5 answers · asked by william b 2

2007-08-27 04:33:01 · 3 answers · asked by Anonymous

1.Suppose the pebble is not completely covered with water, how would this affect the calculated density
2. What is the standard density of water? Describe the meaning of the said standard with corresponding meaning of the units used.

2007-08-27 04:15:52 · 1 answers · asked by clicked 1

1. What evidence did you find to support the idea that matter is made-up of tiny particles and that empty spaces exist between these particles?
2. Differentiate the existence and formation of atoms, ions and molecules. Give examples of each.
3. What is the behavior of phenolphthalein indicator in basic and neutral solutions?

2007-08-27 04:13:35 · 1 answers · asked by clicked 1

this is for the experiment to analyze hortico, a commercial product containing mainly iron (II) sulfate which is used in gardening and agriculture.

2007-08-27 03:22:29 · 1 answers · asked by akmalbrian 1

Q1)) 3kg of ice is dropped in 9kg of water at 55 degree C. Find the final temprature of the mixture.???

2007-08-27 02:48:16 · 5 answers · asked by iqnabeel 1

please give correct answer.

2007-08-27 02:40:11 · 16 answers · asked by nicole 1

answer for that problem.

2007-08-27 02:39:04 · 7 answers · asked by nicole 1

2007-08-27 02:37:48 · 2 answers · asked by Anonymous

2007-08-27 01:39:16 · 1 answers · asked by superfreak 2

why can concentrated sulfuric acid be stored in mild steel tanks, but not dilute sulfuric acid?

2007-08-27 01:30:31 · 2 answers · asked by Anonymous