Chemistry - December 2006

2006-12-27 14:35:10 · 2 answers · asked by kitchenchick 2

here's the question, but actually, if you could point me to a website that explains it, that would be really nice!! Thanks in advance!

DIRECTIONS:Predict and balance the following metathesis reactions based on the solubility of the products. Use abbreviations (aq) and (s) for the reactants and products. All reactants and products. All reactants are aqueous.

1) silvernitrate+potassium chromate

2) ammonium chloride+cobalt(II) sulfate

2006-12-27 14:28:37 · 4 answers · asked by Anonymous

Identify each substance whether it is a pure substance or a mixture. If it is a pure substance, specify if it is a compound or an element, and if it is a mixture, specify if it is a heterogeneous or a homogeneoug mixture.

table salt, magnesium ribbon, burned magnesium riboon, iodine, starch, iodine crystals, sulfur in H2O, H2O added into a burned magnesium ribbon, magnesium ribbon plus H2O, mercury, carbon disulfide, salt dissolved in water, sulfur in carbon disulfide (did it dissolve?), salt in carbon disulfide (did it dissolve?), heated lead(II) nitrate, lead nitrate, groun sulfur and table salt, ground mercury with sulfur.

Please I need your help.
If you have resources, please share it with me. Thank you very much.

2006-12-27 14:08:25 · 2 answers · asked by jann kyle_upvcc 1

whats the diff between heat of combustion and heat of formation?
when calculating, which one do i have to use products minus reactants?

ex.
if the problems tells you that the reaction of burning methane has produced say like 500 kJ...then would that be heat of combustion? except you negate it?

2006-12-27 14:05:52 · 3 answers · asked by silverstar4591 1

2006-12-27 13:16:51 · 2 answers · asked by Esha 1

How long would it really take to dissolve skin?

I work in a chemistry lab and deal with HF, HCl, HNO3, and other acids. A co-worker and I were discussing the acid sceen in Saw 3 and were wondering if that scenario would even be feasible?

At what Conc., N, temp or what type of acid would be needed to produce such an actual effect?

Could any acid that exists actually dissolve your skin/other tissues on contact? And as mentioned above, then what type, conc, and N would be needed?

2006-12-27 13:08:14 · 5 answers · asked by Matthew M 1

2006-12-27 12:50:37 · 9 answers · asked by Balvinder S 1

2006-12-27 12:31:55 · 1 answers · asked by ~Şwěęţĕşţ Mĭšćħĩèf~ 1

Please simplifly it because I'm going to use the information on my science project.

2006-12-27 12:14:11 · 4 answers · asked by bakabaka317 1

i need help on how many molecules are in each.. not sure what's the difference between an ion and molecule ... :(

2O 2
H 2O
3H 2
4H 2O

2006-12-27 11:54:31 · 6 answers · asked by Anonymous

2006-12-27 11:52:45 · 11 answers · asked by Balvinder S 1

23. barium chloride + sulfuric acid >>>> barium sutfate (s) + hydrochloric acid
24. aluminum sulfate + calcium hydroxide >>>> aluminum hydroxide (s) + calcium sulfate (s)
25. copper + chlorine >>> copper(I) chloride (s)
26. aluminum oxide >>>> aluminum (1) + oxygen (g)

Complete the word equation & write the balanced equation. Identify the type of reaction and tell why the products form. Consult the Activity Series as necessary:::
27. calcium + oxygen >>>>
28. copper(II) carbonate>>>>
29. aluminum + hydrochloric acid >>>>
30. potassium iodide + chlorine >>>>
31. barium chloride + sodium sulfate >>>>
32. copper + silver nitrate >>>> copper(II) nitrate +
33. barium hydroxide + sulfuric acid>>>>
34. zinc sulfate + ammonium sulfide>>>>
35. sodium + water >>>>
36. magnesium + sulfuric acid >>>>
37. Mercury(II) oxide >>>>

Thanks for Helping!

2006-12-27 11:36:46 · 2 answers · asked by truckin_90 2

2006-12-27 11:33:37 · 11 answers · asked by Balvinder S 1

i have to do a project on strong and weak bases and i we have to do a demo for it and our demo was gonna be to show an example of a strong base and a weak base so it'd help if you could give me like a common compound that's a strong base and a common compound that's a weak base.

AND also if you have any other ideas on a different demo for strong and weak bases feel free to share your thoughts.

thank you very much for your time.

2006-12-27 11:01:40 · 6 answers · asked by Anonymous

2006-12-27 10:51:52 · 5 answers · asked by iris g 1

what is relative mass? Does it have a unit? why or why not?
Please explain and give some examples.

What is Reference mass? Is it the same to the relative mass?
Reference mass are not always given the value unit. The reference substance may be assigned a mass unit of 5. Please calculate the relative mass of a mung bean if a kidney bean is assigned 25 mass units.

When it comes to atoms, the reference particle is the isotope of carbon, C-12, which is assigned exactly 12 mass units. The relative masses of atoms, known as atomic masses (or atomic weights) have been determined. For some elements, these are:

ELEMENT ATOMIC MASS (relative mass)
hydrogen 1.01
carbon 12.01
oxygen 16.00
iron 55.85
gold 196.97
What do these numbers mean?

PLEASE HELP ME..

2006-12-27 10:49:48 · 3 answers · asked by jann kyle_upvcc 1

If 0.77 mol Calcium nitrate dissolved in water makes 660 g of aqueous solution, what is the percent calcium nitrate in the solution ?

2006-12-27 10:41:53 · 3 answers · asked by Anonymous

HNO3 + I2 ---> HIO3 + NO2 + H2O and by the way its a redox reaction.

2006-12-27 10:32:19 · 3 answers · asked by silver_star 1

2006-12-27 10:30:49 · 3 answers · asked by faeriepuffle 1

at least two examples

2006-12-27 10:08:18 · 2 answers · asked by George 3

can someone please help me balance these equations and EXPLAIN how you did it? i get confused a lot

a. C3H8 (g) + O2 (g) --> H2O (g) + CO2 (g)

b. CH4 (g) + O2 --> CO2 (g) + H2O + energy

c. AgNO3 + MgCl2 --> Mg(NO3)2 + AgCl


thank you VERYYY much!

2006-12-27 09:34:42 · 4 answers · asked by Anonymous

2006-12-27 09:27:11 · 4 answers · asked by kay.ray 2

how can i know if the molecule is chiral or achiral?
or how can i know if the molecule has a plane of symmetry or not?
e.g the Fischer formula of
COOH
H _________OH
HO _________ H
COOH
and the molecule
CH3 CH3
H ________ OH H_________OH
H ________ OH or H_________OH
H _________OH HO_________H
CH3 CH3

2006-12-27 09:22:32 · 2 answers · asked by Diamond 2

I need chemicals like sulfuric acid, and things like it. It's for a science fair project. I also need to know where I can find small blocks of metal. My project is about how acids affect different metals...

2006-12-27 09:09:10 · 6 answers · asked by Anonymous

how many grams of silicon tetrafluoride, a gas, at room temperature, would fill the same volume as that occupied by 295 grams of carbon monoxide at 75 degrees C and 575 torr?

2006-12-27 08:41:57 · 2 answers · asked by rishelly2528 1

2006-12-27 08:36:21 · 10 answers · asked by mr b 1

help.. i need 2 examples each of word equations and formula equations balanced out
thanks in advance :D

2006-12-27 07:58:05 · 3 answers · asked by Anonymous

dropped a crystal into it, the whole mixture just went solid in about 2 seconds, could anyone explain this and tell me what he might have used?

2006-12-27 07:41:43 · 8 answers · asked by maikellysummit 2

Convert Sodium chloride is produced when sodium
metal reacts with chlorine gas to a formula equation

thanks a lotttttttttttttttt :D

2006-12-27 07:40:40 · 3 answers · asked by Anonymous

the strongest i know of that we can go to local stores to buy is J-B Weld i use it all the time but i would like to know how it works and what makes it so strong it has a tensile strenght of 3960 psi why is it so strong is there anything stronger

2006-12-27 07:37:44 · 3 answers · asked by Talking Hat 6