Chemistry - December 2007

In nature, the alkali metals occur as

a) Compounds
b) Comples ions
c) Gases
d) elements

2007-12-05 06:18:01 · 2 answers · asked by Susan J 2

how do i name these acids: HCI
HNO3
H3PO4
HCIO4
HIO3
H2S
HCI
HC2H3O2
HCN
HSO3
H2CRO4
HF
H2SO4
H2CO3
H3PO3
HNO2
HCIO3
HCIO
HBr
HI

2007-12-05 06:15:49 · 7 answers · asked by iloveyou! 1

calculate the number of equivalents in each of the following...

40g of Mg+2
16g of Al+3

is it just 2eq and 3eq for the answers or do you have to so something with the grams???

2007-12-05 06:05:08 · 1 answers · asked by onehotmama 2

This is for chem homework. I need to draw the structural formulas with there correct IUPAC names.

2007-12-05 06:01:32 · 2 answers · asked by averagejogrl2006 1

What of the listed ions have an electronic environment of noble gases:Ca2+, Zn2+, Rb+, S2-, Mn2+, Fe3+

2007-12-05 05:53:22 · 3 answers · asked by jammal hines 1

a steel cylinder contains 128g of oxygen (O2) at 25`C and a pressure of 1000 torr. At STP 1 mol of a gas occupies 22.4 L what is the volume in liters of the oxygen gas in the cylinder??

2007-12-05 05:30:42 · 1 answers · asked by onehotmama 2

2007-12-05 04:57:48 · 3 answers · asked by vanessa velasquez 1

i am really stuck on this.....i got the following equation
C6H7NO + C4H6O3-----C8H9NO2 + C2H4O2
the following info

specific density of acetic anhydride (C4H6O3) is 1.08g/ml
relative molecular mass of paracetamol (C8H9NO2) is 151.2
in an experiment you found out the

mass of 4-aminophenol ( C6H7NO) is 3g
mass of paracetamol is 4g
what is the percentage yield?

10 pts for anyone who can help, many thanks

Jim

2007-12-05 04:32:48 · 1 answers · asked by Anonymous

2007-12-05 04:19:12 · 1 answers · asked by waleed 1

2007-12-05 04:17:06 · 2 answers · asked by Anonymous

A 55ml sample of a 7.50M KOH is diluted by adding 175ml of water. Calculate the new concentration of the KOH solution.

2007-12-05 03:40:49 · 2 answers · asked by Anonymous

2007-12-05 03:19:21 · 6 answers · asked by Ash F 1

I need to make up 2.5L of a 1.25M solution of NaCl for next lab. How many moles of NaCl do I need? and how many grams of NaCl do I need?

2007-12-05 03:18:47 · 2 answers · asked by cdf0 1

stearic acid
potassium iodine
carbonyl diamide
magnesium oxide
sodium chloride
sucrose
calcium chloride
citric acid

or could you tell me how to figure out if they are covalent or ionic using their melting time or conductivity in water or conductivity in ethanol

2007-12-05 03:17:11 · 1 answers · asked by peace 3

Given the reaction 2 NOCl(g) 2NO(g) + Cl2(g) + heat, when the reaction reaches equilibrium, the concentration of NOCl is found to be 1.65M, that of Cl2 is found to be 0.40M, and that of NO is found to be 0.80M.
a. Calculate the equilibrium constant for the reaction
b. Give three ways to help shift the equilibrium to the right.

2007-12-05 03:07:09 · 1 answers · asked by nxml81 1

2007-12-05 03:03:30 · 1 answers · asked by Anonymous

2007-12-05 02:59:38 · 3 answers · asked by Lova girl 2

2007-12-05 02:57:34 · 1 answers · asked by Anonymous

i want the balstein library (chemistry)

it has the chemicalformules &reactions of nearly 1.5 million reactans

i want u to get me the place frm which i can get it
torrents will work great
or any other

2007-12-05 02:39:05 · 1 answers · asked by dhandeep l 1

2007-12-05 02:20:59 · 10 answers · asked by Anonymous

originally i thought alum was alum ,i didnt know that they were different types

2007-12-05 02:17:20 · 1 answers · asked by xerxes n 2

IUPAC. Peoples are use this word in chemistry. I want to know the full form of this word.

2007-12-05 02:09:20 · 5 answers · asked by Anonymous

The specific heat capactiy of silver is 0.24 J/g 'C.

a) Calculate the energy required to raise the temperature of 150.0 g Ag from 273 K to 298 K.

b) Calculate the energy required to raise the temperature of 1.0 mol Ag by 1.0'C (called the molar heat capacity of silver).

2007-12-05 02:08:56 · 5 answers · asked by Caramel 2

The specific heat capactiy of aluminum is 0.900 J/g 'C

a) Calculate the energy needed to raise the temperature of a 8.50 x 10^2 g block of Aluminum from 22.8'C to 94.6'C.

b) Calculate the molar heat capacity of aluminum

2007-12-05 02:04:39 · 1 answers · asked by Caramel 2

Like the title say, why?

2007-12-05 01:40:08 · 1 answers · asked by PIPI B 4

want to make it harder,

2007-12-05 00:36:18 · 3 answers · asked by William B 7

Can anybody explain this to me? Like the properties it gains, it's state, etc.
Preferably without too many scientific terms. ;)

2007-12-04 23:11:43 · 9 answers · asked by Kitteh 2

Ionic or covalent.? how did you say that?

2007-12-04 21:27:25 · 4 answers · asked by Anonymous

A sample of Freon-12 (CF2Cl2) occupies 25.5 L at 247.3 K and 127.6 kPa. Find its volume at STP.

10 pts for best answer

2007-12-04 18:03:06 · 2 answers · asked by Anonymous

A weather balloon is filled with 11 L of helium on the ground wher the atomospheric pressure is 0.9 atm on that day.. If the balloon rises to a height of the atmosphere where the pressure is 0.3 atm, what will the new volume of the balloon be?

2007-12-04 17:57:48 · 3 answers · asked by Anonymous