Chemistry - March 2007

2007-03-04 15:10:43 · 6 answers · asked by Amber S 1

2007-03-04 15:08:36 · 6 answers · asked by Dayna L 2

This question has been puzzling me fore days...The question is....
When a patient has blood cleansed by hemodialysis, the blood is circulated through dialysis tubing submerged in a bath that contains the following solutes in water: 0.6% NaCl, 0.04% KCl, 0.2% NaHCO3, and 0.72% glucose (all percentages are weight/volume). Suggest one or more reasons why the dialysis tubing is not submerged in pure water.

I know that these substances obviously clean the blood better than just pure water, but i'm not sure HOW... this is a chemistry problem, not really a bio problem, but please only answer if you're sure.... this is a question for bonus points and i could really use them! Thank you!

2007-03-04 15:06:13 · 2 answers · asked by Sarah 3

if enthalpy is the heat for a reaction, it must have a sign as well as a magnitude. What sign should the enthalpy for an exothermic reaction have? why?

2007-03-04 14:59:28 · 3 answers · asked by helllooooo 2

2007-03-04 14:55:25 · 2 answers · asked by Amber S 1

^^^^^^^

How Many Valence Electrons Does O2 Gas Have? and how can you tell from the periodic table?

2007-03-04 14:54:05 · 7 answers · asked by Anonymous

1. The formula for iron (3) bromide, is FeBr3 (the 3 is a small subscript)....this formula shows than one formula unit of the compound contains ____ Fe ion(s).

2. An ionic compound composed of at least one polyatomic ion is called a _____ionic compound.

2007-03-04 14:48:04 · 3 answers · asked by Sam A 1

2007-03-04 14:35:08 · 3 answers · asked by aaaaa 2

thanks!

2007-03-04 14:16:59 · 1 answers · asked by roostergirl32 2

2007-03-04 14:05:24 · 1 answers · asked by jonttu 1

2007-03-04 14:03:03 · 2 answers · asked by jonttu 1

1. In 2 Fe2(SO4)3

(the 3, 4, and second 2 are small coefficients.)

Fe:__atoms
S:___atoms
O:___atoms

2007-03-04 13:51:54 · 1 answers · asked by Sam A 1

Please suggest experiments that can be done quickly and with simple household items and chemistry lab equipment.

2007-03-04 13:51:46 · 4 answers · asked by aim42004 2

2007-03-04 13:42:10 · 1 answers · asked by jonttu 1

2007-03-04 13:37:29 · 2 answers · asked by james o 2

2007-03-04 13:16:09 · 7 answers · asked by Anonymous

A 0.20 M sodium chlorobenzoate (NaC7H4ClO2) solution has a pH of 8.65. Calculate the pH of a 0.13 M chlorobenzoic acid (HC7H4ClO2) solution.

2007-03-04 13:08:18 · 2 answers · asked by tanny 1

2007-03-04 13:08:16 · 1 answers · asked by Anonymous

i am writing a chemistry lab report on kinetics, and i really can't get anywhere w/o the avg. time for my two trials. can someone help me out?

2007-03-04 13:07:37 · 3 answers · asked by berry62791 2

Calculate the pH of a 3.3 10-5 M phenol (Ka = 1.6 10-10).

2007-03-04 13:06:44 · 3 answers · asked by smile 1

2007-03-04 12:52:41 · 1 answers · asked by Anonymous

2007-03-04 12:35:08 · 1 answers · asked by linifer74 1

by 3?
by 2?
by 1?
by 0.5?

2007-03-04 12:28:33 · 4 answers · asked by alli p 1

1. An ionic compound composed of at least one polyatomic ion is called a ____ionic compound.

2. What is a binary ionic compound?

3. In a covalent bond, the electrons in the bond are _______.

4. What is a covalent compound?

What type of bond would be created between:

5. Silicon and Oxygen atoms

6. Two Nitrogen atoms

7. Sodium and Nitrogen atoms

8. How many pairs of electrons are involved in a covalent bond?

2007-03-04 12:21:55 · 1 answers · asked by Sam A 1

1. An ionic compound composed of at least one polyatomic ion is called a ____ionic compound.

2. What is a binary ionic compound?

3. In a covalent bond, the electrons in the bond are _______.

4. What is a covalent compound?

What type of bond would be created between:

5. Silicon and Oxygen atoms

6. Two Nitrogen atoms

7. Sodium and Nitrogen atoms

8. How many pairs of electrons are involved in a covalent bond?

2007-03-04 12:21:04 · 1 answers · asked by Sam A 1

Since nitrates are ## NO3 and nitric acid is HNO3

2007-03-04 12:08:00 · 1 answers · asked by Chocolate Strawberries. 4

We had recently done a crushed can lab in chemistry class to see the effects of air pressure on an aluminum soda can. What should have been observed after taking out the can from the bin of water.

2007-03-04 12:06:11 · 1 answers · asked by Anonymous

please help... i'm totally lost with this :(

2007-03-04 12:05:19 · 1 answers · asked by ChEMIsTrY ChICkiE 1

How do you guess what pH a point of equilibrium will be , for example tartaric acid and NaOH, or NaOH and HCl given just the formula. do you need to know the strengths (weak / strong)

this is how you then chose an indicator but what is the point in an indicator if you can use a pH meter? (except for in non aqueous solotions)

ta

2007-03-04 11:52:21 · 4 answers · asked by Anonymous

2007-03-04 11:51:18 · 3 answers · asked by Anonymous