Chemistry - November 2007

Please somebody tell me if this is wrong. We did a lab on reactivity in class (mixed a buch of metals w/ a bunch of nonmetals), and a post lab question is to say what ions tin and lead formed by looking at our data. I don't really no what this means, but here was my thought process.
The possible valences for tin and lead are +2, +4, and -4 right?? And since metals always "want" to lose electrons, and non metals always want to gain electrons I figured that when they bonded sn and pb would get a +2 or +4 charge, cuz they lost electrons. However, my instinct just tells me this is wrong, and I didnt use the data like the questino said to. I would appreciate any help, and promise to give 10 pts to best answer. at the very least pls confirm or deny my thought process.

2007-11-13 14:52:17 · 2 answers · asked by Person X 2

HNO3 + H2S --> NO2 + H2O + S


(NH4)2CrO7 --> Cr2O3 + N2 + H2O

[all numbers are subscripts]


THANKSSS!

2007-11-13 13:49:39 · 2 answers · asked by Anonymous

I am doing a project for Physical Science and need to know this!

2007-11-13 13:45:48 · 4 answers · asked by urgirlwantsme98 1

I feel like I can taste it. Kinda weird.

2007-11-13 13:38:13 · 2 answers · asked by Anonymous

does anyone know the specific heat for gold?

2007-11-13 13:35:30 · 2 answers · asked by ILJB4L!! <3 1

2007-11-13 13:34:15 · 2 answers · asked by Anita 5

Compare the three types of bonds, ionic bond, metallic bond, and covalent bond based on what happens to the valence electrons of the atoms.

Please help!

2007-11-13 13:27:29 · 3 answers · asked by ladyitalkalot 1

Can a compound be seperated by heating?

2007-11-13 13:26:42 · 5 answers · asked by Addicted To Abercrombie & Fitch 2

A. they are rearranged to form hydrogen and oxygen gas.
B.they are destroyed.
C. they increase in size until they form a solid.
D.they combine with oxygen in air to produce new substances

thanks in advance...

2007-11-13 13:25:26 · 4 answers · asked by Brandy boy 2

what is this compound...PI5 ...this is Phosphorus with five iodine...im not sure what the answer should be...pls help!

2007-11-13 13:22:21 · 1 answers · asked by roxie 2

chemistry. cant find answer. NEED HELP!!!!!!!!!!!!!!! due tonight!!!!

2007-11-13 13:22:08 · 4 answers · asked by Anonymous

What is the least active nonmetal in period 6?
Most active family of nonmetals?
Most active metal?
Most common isotope of calcium?
Whats an ionization (oxidation) number?
I've tried to find this info in my notes, but I can't. If anyone can help with any of these i would really appreciate it. Thank y'all.

2007-11-13 13:20:13 · 1 answers · asked by Anonymous

Alright, i have a project due tomorrow, and i need your help..

Aluminum Chloride (AlCl3)
I'm trying to make this into a Lewis Structure, but I'm not sure if im right or not..this is what i have so far..
. . . .
: CL = Al - CL:
| . .
. .
: CL:
. .

So im saying that Cl in the left, has a double bond, while the rest of the Cl have single bonds..

Cl has 7 electrons around it and Al has 3 electrons

Hope you can bare with me, i'm so confused, and hope you guys can help me out..

2007-11-13 13:16:51 · 2 answers · asked by Oliver B 2

What are the circumstances/requirements for the nuclear chain reaction to occur?

Also... Why would there be a subcritical mass of a fissile isotope?

2007-11-13 13:10:48 · 3 answers · asked by Anonymous

name to of these elements

2007-11-13 13:10:37 · 4 answers · asked by mbee 3

with illustration

2007-11-13 13:04:54 · 2 answers · asked by nomad A 1

What would an equation be to show how a buffer made up of equimolar amounts of acetic acid, CH3COOH, and acetate, CH3Coo-, would behave when HCl was added and then when NaOH is added?

2007-11-13 13:00:44 · 1 answers · asked by kaj 1

Thanks!

2007-11-13 12:47:38 · 2 answers · asked by cherryblossom32496 1

If not, what are they exactly?

2007-11-13 12:46:01 · 2 answers · asked by Anonymous

i need to know how to get the answers step by step. all i need is the answere, but i do not know where to begin.

1.Carbon absorbs energy at a wavelength of 150. nm. The total amount of energy emitted by a carbon sample is 5.98 × 105 J. Calculate the number of carbon atoms present in the sample, assuming that each atom emits one photon.


2. An FM radio station broadcasts at 90.2 MHz. Calculate the wavelength of the corresponding radio waves.
i got 9.01 10^7 m

thanx

2007-11-13 12:39:32 · 1 answers · asked by My point exactly 5

A tree killed by being buried under volcanic ash was found to have a ratio of carbon-14 atoms to carbon-12 atoms of 4.8x10^-14. How long ago did the eruption occur?

(The answer is 2.7x10^4, although I'm not sure how they got that answer... could anyone explain what I have to do?)

2007-11-13 12:33:19 · 1 answers · asked by Anonymous

I'm working on a lab report and one of the follow-up questions is:

The highest possible oxidation state for the halogens is +7, and the lowest possible is -1. Which of the following could not disproportionate?

BrO⁻ Cl₂ Br⁻ HClO₄ IO⁻

Can someone please help me figure this out? thanks a lot!

2007-11-13 12:23:18 · 2 answers · asked by lostnconfused 2

N2(g)+O2(g)+heat<-->2NO(g)
why does nitric oxide(NO) not genereally form in the atmosphere but is formed in the internal combustion engine of an automobile or during a lightning storm.

2007-11-13 12:20:58 · 2 answers · asked by m 1

2007-11-13 12:09:59 · 1 answers · asked by baddab369 1

Mass percent?
Mass percent is grams of solute over liters of solution (hydrogen peroxide) i have 8.72g of h2o2

I know i have .46 moles in .00872 liters and the density is 1.00g/ml

what is the %m/m?

2007-11-13 12:08:37 · 2 answers · asked by mikala m 2

2007-11-13 12:08:14 · 3 answers · asked by Dani 1

An explosion is made when lycopodium powder (can be substituted with dry flour) is blown into a flame. Fire (energy) is created.

Are there any other products with this reaction?

(THANKS! =D)

2007-11-13 12:07:50 · 1 answers · asked by Anonymous

2007-11-13 12:00:46 · 1 answers · asked by Hi y'all 1

its for my science homework

2007-11-13 11:56:48 · 8 answers · asked by ♥ Tia Alexandria ♥ 3

Can you still use the equation m=nM?
Lets say you have 0.00000245mol of potassium-40. Are you allowed to assume that M=40g/mol and then multiply it by the moles in order to calculate mass?

Is it even possible to calculate the mass of an isotope, or am I losing my mind? (Nuclear chemistry is making me go crazy, seriously).

2007-11-13 11:50:26 · 2 answers · asked by Anonymous