Chemistry - October 2006

Which element is oxidized and which is reduced in the following reactions?
a.) Si (s) + Cl2( g) -----> SiCl4 ( s)
b.) 3 Cu( NO3)2 ( aq) + 2 Fe (s)------>2Fe(NO3)3(aq) + 3Cu(s)

2006-10-28 12:22:46 · 2 answers · asked by Catherine D 1

Sucrose, C12 H22 O11, is a nonelectrolyte; hypochlorous acid, HClO, is a weak electrolyte; and sodium chloride, NaCl, is a strong electrolyte.
a). What are the solute particlespresent in aqueous solutions of each compound?
b). If 0.1 mol of each compound is dissolved in solution, which one contains 0.2 mol of solute particles, which contains somewhere between 0.1 and 0.2 mol of solute particles?

2006-10-28 12:17:08 · 5 answers · asked by Catherine D 1

a) SO4-2 (has a charge of -2)
b) BF3
c) O2
d) Al-H-I2 (one Al, one H and 2 I atoms)

i know its not C because O2 has a zero dipole moment, since both have the same electronegativity they cancel each other out. but still i cant get to the right answer... PLEASE HELP ME!

2006-10-28 12:02:43 · 3 answers · asked by r.y 2

Which of the following statements about boiling points of molecular substances are correct ?


a) HF has a higher boiling point than CH4

b) For the boiling points of hydrogen compounds of Group 16
H2Te > H2Se > H2S > H2O

c) For the boiling points of hydrogen compounds of Group 17
HF > HI > HBr > HCl

d) For the boiling points of hydrogen compounds of Group 14
CH4 > SnH4 > GeH4 > SiH4

note, there may be more than one answer

2006-10-28 11:44:12 · 3 answers · asked by MARK 2

Which of the following designations, polar or nonpolar, are correct for the given compounds below ?


a) HF : polar

b) NH3 : nonplar

c) CH3CH2CH2OH : nonpolar

d) I3- : polar

2006-10-28 11:42:03 · 6 answers · asked by MARK 2

Identify the hybridization of the central atom for both





XeF4 and PO4-3

2006-10-28 11:38:57 · 2 answers · asked by MARK 2

Identify the hybridization of the carbon atom(s) in C2F4

Also give the number of π bonds in the molecule or ion

2006-10-28 11:36:59 · 2 answers · asked by MARK 2

ammonium nitrate + water

ammonium nitrate - water

can it be reversed

2006-10-28 11:30:20 · 2 answers · asked by Me + Me = BANG! 2

Consider the combustion reaction:
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l)
When 0.200 mol of C3H8 undergoes combustion, the heat released is sufficient to raise the temperature of 1550 g of water from 20.0 °C to 70.8 °C. Based on these data, calculate ΔH for this reaction. Specific heat of water is 4.18 J/ g•°C. All choices are per mol of C3H8.

A. -1650 molkJ
B. -1240 molkJ
C. -860 molkJ
D. -1950 molkJ
E. -430 molkJ

How did you work it out? Thanks.

2006-10-28 11:17:37 · 2 answers · asked by Anonymous

And do grenades explode when the pin is pulled, but they are not thrown? If you were to through a grenade while the pin was still intact the grenade will not explode. However, the opposite is true when the pin is not intact and the grenade is thrown. Why is this?

2006-10-28 11:14:09 · 11 answers · asked by Anonymous

label each reactant and product as acid, base, salt, or water

NaOH + H NO3

2006-10-28 10:46:30 · 4 answers · asked by prjpr29b 1

2006-10-28 10:31:17 · 9 answers · asked by Anonymous

2006-10-28 10:10:22 · 4 answers · asked by connie 1

help..i have a question in my GCSE homw work that i cant find it is:
"search for some record breakers, like how many elements are there in the most expensive element." well i don't know and cant find any thing :(

2006-10-28 09:06:58 · 10 answers · asked by xoxXaimless..Xxox 2

2006-10-28 08:20:49 · 13 answers · asked by Misery loves company 2

A 200 mL sample of oxygen gas is collected at 26 degrees celcius and a pressure of 690 torr what volume will the gas occupy at STP
I have the conversions of temp into K V into L and Pressure into Atm I need help
I believe it is set up
.2Lx.908atm/299K X.0625
I am not sure if it is set up correctly

2006-10-28 08:13:23 · 3 answers · asked by coolpuffin 2

Again... not salt. Sugar. Please if someone could answer this confounding brain killing question.

2006-10-28 08:02:56 · 11 answers · asked by Ballerina 1

It's been a while since I've taken general chemistry, and I'm looking back at some questions and the information I need for this one isn't coming back to me. The question reads.

What is the wanelength, in nm, of radiation that has an energy content of 1000 kJ/mol?

If anyone can give me a hand with this one, I would greatly appreciate it. Thanks.

2006-10-28 07:58:53 · 4 answers · asked by Anonymous

Carbonated water dissolves acetaminophen and other pain relievers faster than regular water because it is more acidic and it contains carbon atoms in it meaning it'll dissolve the tylenol faster..is this true?? please kindly give me more info.. on this topic

2006-10-28 07:31:20 · 4 answers · asked by jlanlu 1

2006-10-28 06:57:24 · 2 answers · asked by Anonymous

The prices are rising and we need to save money for the really important things such as buying food or the family. Does anyone have any tips on how to save electricity?

2006-10-28 06:31:34 · 10 answers · asked by Fly high Butterfly 1

I know that H2O is bonded because O has 6 electrons on the last shell.. and the H2 has 2 electrons to share with O giving it 6 and H getting 2.

However, when I think about Ag2O I don't see how the shells can be filled.

Can any one explain this (without using valence electrons and the dot diagram thing?)

2006-10-28 06:26:43 · 2 answers · asked by Eddie Y 1

2006-10-28 06:12:59 · 6 answers · asked by Ranadeep M 1

2006-10-28 05:26:38 · 7 answers · asked by gaby 1

Calculate the chloride ion concentration (in mol/L) in a solution prepared by adding 8.003 g KCl(s) to 159.8 mL of a 0.496 M BaCl2(aq) solution. Assume the volume of the solution isn't changed by the addition of the solid.

2006-10-28 04:53:26 · 2 answers · asked by Anonymous

I dont understand why the resulting value is not a hole number.

Please be serious and answer the question above.

2006-10-28 04:52:16 · 4 answers · asked by j dog 2

2006-10-28 04:34:37 · 5 answers · asked by Anonymous

Please give me sources

2006-10-28 04:29:56 · 10 answers · asked by Jake h 1

how does the consentration of salt in the soil affect potatoes?

2006-10-28 03:52:06 · 4 answers · asked by aliza19930524 1

2006-10-28 03:23:04 · 4 answers · asked by STORMY K 3