Chemistry - May 2007

In the experiment lead became reddish brown, some of it fell and sank to the bottom. And the copper sulfate became light green instead of dark green, this is confusing me, because it seems as if they both reacted, but lead is more reactive than copper, and as I know , a more reactive metal will displace a less reactive metal from its compounds, can you please explain what happened here? and if possible right the equation.

2007-05-18 02:50:59 · 2 answers · asked by Anonymous

Simple science experiments?
need it for my demonstration tomorrow, experiments that are not messy and have simple principles like using only two objects things like that.

2007-05-17 20:23:48 · 1 answers · asked by haringmarumo 6

alcohol + carboxylic acid -->

2-methyl-1 butanol + ethanoic acid -->

methanol + salicylic acid -->

butanol + ethanoic acid -->

ethanol + butanoic acid -->

1,2,3-propantriol + nitric acid -->

glycerol + nitric acid -->

2007-05-17 16:38:17 · 2 answers · asked by ╦╩╔╩╦ O.J. ╔╩╦╠═ 6

2007-05-17 16:30:12 · 3 answers · asked by harleyrider786 1

i need help on this problem,
Hydrogen gas wa perpared in 1776 by Cavendish by passing steam through a red-hot iron rifle barrel, this process also produced Fe3O4. What mass of iron react in the production of 73.6dm3 of hydrogen measured at STP?

2007-05-17 16:21:47 · 2 answers · asked by Anonymous

2007-05-17 15:20:35 · 0 answers · asked by Anonymous

I'm so confused.. I have little bacground in anything regarding acids and bases in the form of finding their "level."

I've found the equation:
HA + H20 <=> H30 + A-

And I have the following to rank from acidic to basic:
Methanol (CH3OH)
Methanoic acid (CHOH)
Methanamine (CH3NH2)
Methanal (CH2O)

I've read books, looked at websites, for at least 1.5 hours.. I still don't get it.

I have them all drawn out, labled, chemical formulas.. but what do I do now?

Thanks.

2007-05-17 14:57:21 · 2 answers · asked by Roosterruler 2

Can someone tell me the complete iconic equation for the follow four problems?

1) Na2C2O4 + Ba(NO3)2 --> Na(NO3)2 + COBa

2) Na2SO4 + Ba(No3)2 --> Na(NO3)2 + SOBa

3) NaC2O4 + BaCl2 ---> NaCl + COBa

4) NaSO4 + BaCl --> NaCl + SOBa

2007-05-17 14:40:48 · 2 answers · asked by Anonymous

help

2007-05-17 14:26:07 · 6 answers · asked by Alex 1

is it manufactured in a factory?

2007-05-17 14:25:56 · 3 answers · asked by Russel 1

Given the reaction at equilibrium: http://schoolisland.com/review/Courses/Chem/chem010285-q1.gif
Which change will shift the equilibrium to the right?

increasing the temperature
increasing the pressure
decreasing the amount of SO2(g)
decreasing the amount of O2(g)

Given: http://schoolisland.com/review/Courses/Chem/q2225.gif
Which statement correctly describes the energy changes that occur in the forward reaction?
The activation energy is 10. kJ and the reaction is endothermic.
The activation energy is 10. kJ and the reaction is exothermic.
The activation energy is 50. kJ and the reaction is endothermic.
The activation energy is 50. kJ and the reaction is exothermic.

2007-05-17 14:25:46 · 1 answers · asked by Celia 4

I am taking this in the fall at a jr college. To help prepare myself for this class, what should I study up on the most? Thanks

2007-05-17 14:18:42 · 7 answers · asked by Anonymous

which element is oxidized and which element is reduced in each of the following reactions

a) K2 Cr2 O7 + 14HI -->> 2KI + 2CrI3 + 3I2 + 7H20


b) Cu + 2AgNo3 ---> Cu(NO3)2 + 2Ag

C) Na2SO4 + 4C -> Na2S + 4CO

2007-05-17 14:11:28 · 1 answers · asked by kei 2

I'm studying for a quiz and need help doing the following problems: ( Ihave the answer I just need help with the process)

2 C6H14 (l) + 19 O2 (g) ==> 12 CO2 (g) + 14 H20 (l)
where the delta H = -2005 kcal

How many liters of oxygen at STP are needed to produce 1234 kcals? (ans. 261.9 liters)

If 164 gr of CO2 is produced, how much energy is also produced? (ans. 623 kcals)

and with

2 Mg (s) + O2 (g) ==> 2 MgO (s)
where delta H = -288 kcal

If 17.7 grams of MgO is produced, how many kcals are also produced? (ans. 63 kcals)

2007-05-17 13:47:13 · 1 answers · asked by Anonymous

If a substance is a very strong reducing agent, what does this mean in terms of electrons?

2007-05-17 12:08:20 · 4 answers · asked by Anonymous

If a substance is a very strong oxidizing agent, what does this mean in terms of electrons?

2007-05-17 12:07:36 · 0 answers · asked by Anonymous

2007-05-17 12:03:10 · 6 answers · asked by Anonymous

The analysis of iron by an oxidation-reduction titration is a common analytical method. A common titrant used in this analysis is a solution of the cerium (IV) ion, which is reduced to cerium (III) in the analysis. In one chemical analysis of some iron ore, the sample is treated to convert all of the iron to iron(II) ions. A 25.0-mL sample of iron (II) is titrated with .125 mol/L cerium (IV) solution using a redox ondocator. The average volume of cerium (IV) required to reach the endpoint was 15.1 mL. Calculate the concentration of the iron (II) ions in the sample.

2007-05-17 11:53:29 · 1 answers · asked by Anonymous

PLease Help complete the half reaction equation.Classify it as an oxidation or reduction

Please show me your work

a) dinitrogen oxide to nitrogen gas in an acidic solution

b)nitrite ions to nitrate ions in a basic solution

c)silver(I) oxide to silver metal in a basic solution

d)nitrate ions to nitrous acid in an acidic solution

e)hydrogen gas to water in a basic solution

2007-05-17 11:45:56 · 1 answers · asked by Anonymous

Recently I did an ice cream-making experiment. We added ice cubes & salt into a large ziploc bag and in a smaller bag, milk, sugar, & vanilla were added. then the small bag was placed into the larger bag, sealed, and after some time, ice cream was formed within the smaller bag. Why was salt needed in this experiment? How did it allow (on a molecular basis) the milk solution to turn into ice cream?

2007-05-17 11:40:23 · 2 answers · asked by !!! 3

2007-05-17 10:42:40 · 0 answers · asked by 41 1

2007-05-17 09:11:58 · 5 answers · asked by mya 1

2007-05-17 08:43:18 · 4 answers · asked by gadm18 3

my sicence teacher and our books say so but how?

2007-05-17 08:19:52 · 9 answers · asked by Tyler S 1

A student wishes to perform an electrolysis lab for an aqueous sodium fluoride solution according to the reaction,
Na +(aq) + 2 F –(aq) --> F2(g) + Na(s).
Why is this not possible?

2007-05-17 08:16:50 · 2 answers · asked by Anonymous

As plain and simple as possible i need to know how to find a net ionic equation????? Any example will do. This concept is not clicking in my head.

2007-05-17 07:35:48 · 3 answers · asked by Anonymous

(I can't do subscripts so the big number behind the letters should be read as a subscript)
Equation:

K2CO3 + Br2 ---> KBr + KBrO3 + CO2

2007-05-17 07:02:09 · 3 answers · asked by Rachel 1

2007-05-17 06:40:30 · 9 answers · asked by Anonymous

Thanks!

2007-05-17 06:35:23 · 4 answers · asked by Anonymous

A. hydrogen and oxygen gases
B. oxygen and chlorine gases
C. solid NaCl
D. a water solution of NaOH

In the setup for electroplating chromium on steel the chromium ions would be
A. released at the steel cathode
B. found in the electrolyte solution
C. absorbed by the steel anode
D. absorbed by the chromium anode

2007-05-17 06:33:45 · 2 answers · asked by Anonymous