Chemistry - October 2007

is it right to assume 1 mg/ml =1000 µg

2007-10-15 10:31:38 · 5 answers · asked by may 1

Which of the following compounds have a
covalent bond?
1. NaCl
2. RbCl
3. KCl
4. HCl

2007-10-15 10:05:21 · 5 answers · asked by eileen r 1

Ionic compounds involve a (share, transfer)
of electrons and typically involve atoms that
have (large, similar, very di®erent) electroneg-
ativities.
1. transfer; very di®erent
2. transfer; large
3. share; very di®erent
4. transfer; similar
5. share; similar
00

2007-10-15 10:04:52 · 4 answers · asked by eileen r 1

2007-10-15 09:46:36 · 5 answers · asked by nicola 666 1

Cu(s) +HNO3(l) --> Cu(NO)3 (aq) + NO2(g) + H2O (l)

2007-10-15 09:34:02 · 2 answers · asked by bippidibopiddi 2

Lead has a density of 11.34g/cm cubed and oxygen has a density of 1.81*10 to the -3 power g/ cm cubed at room temperature. How many cm cubed are occupied by one gram of lead?
Please explain how you would do this?
thanks in advance

2007-10-15 09:32:37 · 1 answers · asked by hi 3

The fact that water can be broken down into gaseous substances that do not behave at all like water, suggests that water is not an element.

TRUE or FALSE

I think that it is TRUE water isn't an element. The fact that it can be broken down into a gas that doesn't behave like water doesn't matter. RIGHT???

2007-10-15 09:15:36 · 5 answers · asked by LJC 2

2007-10-15 09:15:32 · 3 answers · asked by rjamosh 2

a) OF2


b) N3-


c) NO2-


d) IF5


e) C2H6O

2007-10-15 09:10:06 · 1 answers · asked by harrisiticcheese 1

CH2=CH2 + Br2 → BrCH2CH2Br

2007-10-15 09:08:59 · 1 answers · asked by harrisiticcheese 1

http://tinypic.com/view.php?pic=bdqy45&s=2
Which of the following statments correctly identify the above molecules that are equivalent to each other ?

A) a and b
B) a and c
C) a and d
D) b and c
E) c and d



You must enter all the letters of your choices

2007-10-15 09:04:40 · 2 answers · asked by physicsisgay 2

Write the 14 sets of quantum numbers that describe the 14 electrons of Silicon. How would I do this?

2007-10-15 08:51:48 · 3 answers · asked by Anonymous

You are the substitute teacher for a high school biology lab and you need 5.00 L of 0.20 M acetate buffer, pH 4.50. You discover that the buffer available in the lab is actually pH 5.0. Since you do not have time to make up fresh buffer, you will need to adjust the pH using acid. How many milliliters of 6.00 M HCl do you need to add to the 5.00 L of 0.20 M buffer to adjust the pH from 4.50 to 5.00?

Hint: determine (HA) and (A-) at pH 5.00 and then at pH 4.50 and then calculate how much HCl is needed to react with A- to create more HA and less A-.

2007-10-15 08:51:26 · 2 answers · asked by SJ 1

What is [CN^-^]? What is [HCN]? Where do H+ and CN^-^ ions come from?

2007-10-15 08:42:28 · 2 answers · asked by ballababy0520 1

2007-10-15 08:42:23 · 2 answers · asked by Callie C 1

I took Chemistry last year, this is Chemistry 2.

We're reviewing this now, it's nomenclature right?

Anyways, are there any helpful websites you know of that will help me review these?

There are a few I need help with-

1. CoO
2. mercury (I) chloride
3. Pb (C2H3O2)2 -X- (It was a dot)3H2O
4. Chromic Oxide

Thanks so much!

2007-10-15 08:23:28 · 4 answers · asked by Anonymous

What is an element name for Carbohydrate?

2007-10-15 08:21:11 · 2 answers · asked by danny 2

You fill a balloon with helium gas to a volume of 2.96 L at 23 °C and 758 mmHg. Now you release the balloon. What would be the volume of the helium if its pressure changes to 636 mmHg but the temperature is unchanged?

2007-10-15 08:21:08 · 3 answers · asked by Bernie 1

I only need one word answers.

1. What reduces the concentration of hydrogen ions in a solution?
2. When is water the solvent?
3. What is an ion with a charge of -1?
4. What is the ability for water molecules to cling to sides of a tube?
5. What increases the concentration of hydrogen ions in a solution?
6. What is the measure of how much solute is dissolved into a solvent?
7. What is one or more substances dissolved into another substance?
8. What makes water stretchy and difficult to break?
9. What is an ion with a charge of +1?
10. What helps to minimize rapid changes in H+ and OH- concentration in a solution?
11. What does the solute dissolve into?

All answers are appreciated.

2007-10-15 08:04:13 · 4 answers · asked by Anonymous

A diprotic acid, H2A, has the following constants:
Ka1 = 0.0011
Ka2 = 0.0000025
In order to make a solution of pH 5.8 what is the pKa of the acid component?

2007-10-15 07:19:47 · 1 answers · asked by Tiffany 4

2007-10-15 06:13:50 · 6 answers · asked by Anonymous

what is the name of the list of names in the science book for example co2 they tell you the name of it or h2o they tell u its water can someone tell me where i can get the list on the the computer for some website please

2007-10-15 06:12:25 · 2 answers · asked by Anonymous

an organic cofactor for an enzyme
an inorganic cofactor for an enzyme
a coenzyme
an inactive form of an enzyme

2007-10-15 06:02:39 · 2 answers · asked by kleo 4

simple amides
monosubstituted amides
disubstituted amides
all would be equally soluble

2007-10-15 06:01:32 · 3 answers · asked by kleo 4

an ammonium ion and OH-
a salt
an amide plus HCl
an amide plus a carboxylic acid

2007-10-15 05:59:58 · 2 answers · asked by kleo 4

neam of polymer and additive

2007-10-15 05:58:11 · 1 answers · asked by zahra r 1

alkene < aldehyde < alcohol < ketone
aldehyde < ketone < alkene < alcohol
alkene < ketone < alcohol < aldehyde
alkene < ketone < aldehyde < alcohol

2007-10-15 05:56:18 · 3 answers · asked by Anonymous

A calorimeter contains 31.0 mL of water at 11.0 degrees C. When 2.00 g of X (a substance with a molar mass of 44.0 g/mol) is added, it dissolves via the reaction

X(s) + H_2O(l)-----> X(aq)

and the temperature of the solution increases to 27.0 degrees C.

Assume that the specific heat and density of the resulting solution are equal to those of water [4.18 J/(g * degrees C}) and 1.00 g/mL] and that no heat is lost to the calorimeter itself, nor to the surroundings.

2007-10-15 05:56:10 · 4 answers · asked by Anonymous

CH2C(OH)(CH3)2
CH2CH(OH)CH2 (CH3)2
CH3OH
HOCH2CH2OH

2007-10-15 05:55:35 · 2 answers · asked by Anonymous

A
NAD+
NADH
FAD

2007-10-15 05:52:33 · 2 answers · asked by Anonymous