Chemistry - January 2007

2007-01-28 10:30:39 · 2 answers · asked by Anonymous

Calculate the pH of a .700 M NaC2H3O2.
Ka (HC2H3O2)=1.8*10^-5

the answer is 9.29 but i dont know how it was solved by the packet

2007-01-28 10:17:38 · 1 answers · asked by Anonymous

2007-01-28 10:08:36 · 1 answers · asked by mn1998 2

2007-01-28 10:06:39 · 10 answers · asked by kooikerhounddog 4

2007-01-28 09:55:50 · 3 answers · asked by Heavy Metal 3

Hi please help
A 0.4647-g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.8635 g of CO2 and 0.1767 g of H2O. What is the empirical formula of the compound?

2007-01-28 09:53:20 · 3 answers · asked by Anonymous

How do i find the isoelectric point from a titration curve? How can i tell what the pKa values for COOH and NH3+ using the titration curve?

2007-01-28 09:45:12 · 2 answers · asked by ginnyp82 2

2007-01-28 09:40:39 · 1 answers · asked by Kimberlee P 1

they are soo easy but i cant remeber how to do them.....so if u can please help me do it and explain how u got the answer......

1)what is the volume(in cm3) of a block of gold 2 cm X 4 cm X 12 cm?

2)what is the mass of the gold block in question 1?

thanx i really appreciate it !!!!

2007-01-28 09:30:21 · 2 answers · asked by help 1

Please explain how to do this so i can answer all of my other questions

2007-01-28 09:27:06 · 4 answers · asked by Anonymous

I have this science project about chemical reactionsand stuff can someone tell me a mixture of chemicals that actually do something?

2007-01-28 09:26:22 · 2 answers · asked by eliquichi3 1

What is the concentration of NH3 in household ammonia when 48.25 mL of 05246M HCL are needed to neutralize 22.00 mL of the ammonia solution?

What does the M stand for?
What is the end answer?

That's all I need to know so far.

2007-01-28 09:21:34 · 3 answers · asked by Basiate 5

1) Select a water soluble compound of lead from the following and name it giving its correct formula:

Pb2+ No3-
Pb2+ CH3COO-

2) Select a water insoluble compound of lead from the following and name it giving its correct formula:

Pb2+ Cl-
Pb2+ Br-
Pb2+ I-
Pb2+ SO4 2-
Pb2+ CO3 2-
Pb2+ S 2-
Pb2+ OH-

2007-01-28 09:20:11 · 2 answers · asked by Anonymous

If Kc is less than 1, which is true of this reaction?
COCl2 <-->CO+Cl2
1. concentration of reactant is much greater than the concentration of products
2. concentration of products is much greater than the concentration of reactants
3. catalyst will increase concentration of products formed
4. at equilibrium, the concentrations of reactants and products are equal.
5. the concentrations of products and reactants are approx. equal.

since Kc<1, the reactants are favored, so doest hat mean that the concentration of reactants is much greater than the conc. of products? (choice1)?

2007-01-28 09:07:10 · 1 answers · asked by Anonymous

thanks

2007-01-28 08:51:01 · 4 answers · asked by jk_haha_04 1

I realize salt water makes people more thristy but why? The NaCl substance doesn't change the H20 substances they don't react and make a new substance that isn't water?

2007-01-28 08:42:36 · 2 answers · asked by Anonymous

all metals have high luster, but tarnish readily in air ?

2007-01-28 08:41:17 · 1 answers · asked by luckyplaya23 2

How much heat (kJ) must be removed in order to change 2.78 moles of water at 49.0 oC to ice at -24.0 oC ?


The specific heat capacity of solid water is 2.03 J g-1 oC -1

2007-01-28 08:32:03 · 2 answers · asked by katttiscool 1

2007-01-28 08:26:30 · 15 answers · asked by Anonymous

can you list 4 similarities and 4 differences in rare earth metals ?

thanks :]]

2007-01-28 08:25:45 · 1 answers · asked by luckyplaya23 2

An atom has four electrons in its valence shell. What types of bonds is it capable of forming?
a. ionic
b. single, double or triple covalent
c. polar covalent bonds

d. nonpolar covalent bonds
e. All of the above

f. All of the above except ionic bonds

2007-01-28 08:23:48 · 1 answers · asked by Green-Eyed Gal 7

I'm stuck on how to do the caculation ... the actual answer in litres is neglegable.

2007-01-28 08:03:35 · 6 answers · asked by l0bster_quadrille 4

what ideas did the social contract theory contribure to the development of he american system of government?

2007-01-28 07:52:21 · 3 answers · asked by Anonymous

the 50 states lack which basic characteristic of a state?

2007-01-28 07:50:04 · 3 answers · asked by Anonymous

2007-01-28 07:41:51 · 8 answers · asked by Jon Civil 2

what mass of carbon atoms contains the same number of atoms as 32g of sulphur atoms?

thanks =)

2007-01-28 07:35:02 · 3 answers · asked by Anonymous

2007-01-28 07:24:03 · 5 answers · asked by jarnagin.m@sbcglobal.net 1

i am doing a science project and i can only find about hot water freezing..does anyone know any good books or websites on this topic?

2007-01-28 06:39:32 · 6 answers · asked by carolyn 3

oxidation of apples. measuring it. science project.

2007-01-28 06:38:25 · 1 answers · asked by Harajuku Kidd 1

how is starch related to the chemistry of apples?

2007-01-28 06:35:42 · 15 answers · asked by Anonymous