Chemistry - November 2006

chemicals which dissolve metals
chemicals used for cleaning
in fuels
in battery fluid
in salad drssings

2006-11-27 16:19:58 · 3 answers · asked by margarittanosalt 2

vinegar/ stomach fluid/ seawater/tomato juice/ wine

2006-11-27 16:18:23 · 5 answers · asked by margarittanosalt 2

i am conducting an experiment using salt water to create electrictricty

2006-11-27 16:16:56 · 6 answers · asked by Bryce R 1

For the reaction BaCl2 (aq) + ZnSO4(aq) -->

2006-11-27 16:08:59 · 1 answers · asked by g G 1

2006-11-27 16:07:30 · 2 answers · asked by Anonymous

You are purifying 10g of Compound A contaminated wid 1g of Compound B
Solubility of A: at 0 celsius, 0.1g/100mL at 100 celsius 7 g/100mL
Solubility of B: at 0 celsius, 0.9g/100mL at 100 celsius 1.3 g/100mL

a.)calculate minimum volume of ethanol that you will nid to completely dissolve the sample
b.)Calculate % recovery of A upon crystallization, disregarding experimental losses
c.)Is A pure after crystallization?
d.)Is A pure after crystlztion if A (10g) is contaminated wid 1.5 g of B? wat is d % of A in d crystallized prodct?

2006-11-27 15:52:49 · 2 answers · asked by john m 1

2006-11-27 15:50:33 · 2 answers · asked by Lindsay A 1

2006-11-27 15:41:49 · 5 answers · asked by Anonymous

2006-11-27 15:40:44 · 3 answers · asked by Lindsay A 1

Assign an oxidation number to each atom in the following compound.


PbO2

Answer Format:


For KMnO4 the correct answer would be +1 +7 -2 for the elements K Mn and O respectivley.


That is, you must type in the oxidation numbers for each element in the compound
(reading from left to right)

Put one and only one space between each oxidation number, and include the sigh + or -,
as in the example answer format above

2006-11-27 15:40:10 · 3 answers · asked by nietzsche 1

2006-11-27 15:36:20 · 4 answers · asked by Anonymous

Which of the following statements are true for the reaction


Ca(OH)2(aq) + HCl(aq) -->



a) Water is a product

b) When balanced the coefficient of HCl(aq) is 3

c) The molecular equation is the net ionic equation

d) Ca(OH)2(aq) appears in the net ionic equation

e) H2O(l) appears in the net ionic equation

Examples of species are (aq) (s) (l) etc.


you must enter all true statements in one lower case group,
in alphabetical order with no spaces
e.g., if a) b) and e) are true you would enter abe

2006-11-27 15:29:24 · 2 answers · asked by nietzsche 1

A student prepares a solution by dissolving 3.81 g of NaOH in enough water to make 300. mL of solution.
The student then transfers 25.0 mL of this solution into a 100. mL volumetric flask. Water is then added
up to the 100. mL mark.
What is the final molarity of NaOH in the 100. mL flask ?


Enter a numeric answer only, don't include units in your answer.

2006-11-27 15:28:00 · 2 answers · asked by nietzsche 1

2006-11-27 15:27:59 · 5 answers · asked by Anonymous

Which of the following statements are true?


For statements a) through d) use the reaction:


SiCl4(l) + 2Mg(s) --> 2MgCl2(s) + Si(s)



a) Mg is the reducing agent

b) SiCl4 is the reducing agent

c) Mg is reduced

d) SiCl4 (or Si in SiCl4) is reduced

e) CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g) is a redox reaction

f) Al(OH)4-(aq) --> AlO2-(aq) + 2H2O(l) is a redox reaction

Note: you can have more than one answer.

2006-11-27 15:26:03 · 3 answers · asked by nietzsche 1

Entropy is the
measure of the disorder
in a system. When energy
transforms from one form to
another, it goes toward greater
disorder, therefore greater entropy!

What does all of that mean? Does it mean that things have a natural drive to get messy? Or that entropy increases as enegy transforms such as the enegy of the sun is absorbed by trees and the trees produce oxygen and that is absorebed by humans and humans produce CO^2 and so on? Would that cycle constitute as increasing entropy?

CAn someone explain?

2006-11-27 15:18:29 · 8 answers · asked by whosit? 2

They're caused by hot tyres, but what *are* they actually? Rubber tyre molecules (whatever compounds they're made of)? How are they formed? Can someone describe the process in detail?

I also want to know if the marks can be removed, and how?

2006-11-27 15:18:28 · 2 answers · asked by espers_cypher 2

write a skelton equation with the corrected formula for each chemical in the reaction.

2006-11-27 15:00:14 · 2 answers · asked by carboy_carlover 1

2006-11-27 14:58:57 · 7 answers · asked by Joan V 1

1. Liquids generally have lower density compared to their solid state. Then why does ice float on water?

2. Why are we able to sip hot tea faster from a saucer than from a cup?

3. How does water kept in an earthen pot become cool during summer?

4. Why does a desert cooler cool better on a hot, dry day?

5. List all the difference between homogenous and heterogenous mixtures

2006-11-27 14:55:13 · 6 answers · asked by Akilesh - Internet Undertaker 7

there are a bunch of hair follicles growing, is this the sign of Jesus coming?

2006-11-27 14:52:29 · 3 answers · asked by Anonymous

example: christmas ornaments with elements on them.

2006-11-27 14:43:23 · 9 answers · asked by superman798 1

please explain

2006-11-27 14:38:27 · 2 answers · asked by Anonymous

ether, alcohol, ester, phenol

2006-11-27 14:17:59 · 6 answers · asked by Anonymous

CH3OH, CH3CH2OH, CH3CHOHCH3, CH3OCH3

2006-11-27 14:12:23 · 2 answers · asked by Anonymous

For a visual presentation [a poster with a picture], what can I draw to show the the way entrophy applies to today's world?

2006-11-27 14:11:35 · 4 answers · asked by whosit? 2

2006-11-27 14:11:28 · 6 answers · asked by redheadsushi86 1

I should know this but frankly my brain is fried....

2006-11-27 14:09:13 · 3 answers · asked by Myra G 5

2006-11-27 14:09:04 · 3 answers · asked by A B 1

I need help on this formula problem. I'm not sure if from Pt+ZnSO4 the answer would be either Zinc Platinum (IV) Sulfate or Zinc (II) Platinum (IV) Sulfate since the charge is cancelled for Zinc. Which one is it?
Thanks.

2006-11-27 14:03:51 · 1 answers · asked by Field Hockey Girl 3