Chemistry - April 2007

a)0.1 M HCN / 0.1 M KCN
b)0.01 M HCN / 0.01 M KCN

2007-04-03 05:31:18 · 1 answers · asked by V P 1

Ksp of AgCl= 1.6*10^-10

2007-04-03 05:27:00 · 3 answers · asked by V P 1

the answer is (a)Me3N
"Me" means methyl. "Et" means ethyl.
all the numbers written are in subscript.

PLZ give me a proper reason for the answer, i guarantee selecting a convinving answer as the best one.

2007-04-03 05:21:09 · 1 answers · asked by practico 1

2007-04-03 04:21:50 · 1 answers · asked by wjean07 1

BF3 is an electron deficient molecule. B has only 5 electrons. BF3 has a tendency to react with NH3 to form a BF3NH3.

Suggest reason(s) for the reaction and describe the bonding of BF3NH3

2007-04-03 04:20:11 · 4 answers · asked by Anonymous

1) The standard state for F2 is the pure gas at 1 atm pressure and 25°C.
2) The standard state for fluorine gas is the pure gas a 1 atm pressure and any temperature.
3)The standard state for the glucose solution is the pure crystalline solid.
4) The standard state for the glucose in aqueous solution is when the concentration is 1M and T = 25°C and P = 1 atm.
5) The standard state for both substances is zero degrees Kelvin with both being perfect crystals

2007-04-03 04:15:13 · 1 answers · asked by gmaghrebi 1

2007-04-03 03:54:56 · 1 answers · asked by man_with_questions 1

2007-04-03 03:49:25 · 1 answers · asked by Sinelk B 1

Need to understand how to calculate this

2007-04-03 03:44:06 · 3 answers · asked by Anonymous

This equilibrium problem has been killing me for quite a while. Any help appreciated greatly! Thanks

In an experiment, 3.00 mL of 0.0698 M A, 2.00 mL of 0.0845 M B, and 5.00 mL of distilled water are mixed in a beaker. After the reaction has reached equilibrium, the absorbance of the product C is measured and its concentration is determined to be 0.00605 M. Calculate the equilibrium constant for this reaction.

A(g) + B(g) <->C(g)

2007-04-03 03:34:16 · 1 answers · asked by AppleCard! 2

50.0mL of 1.00M Hcl and 2.0 g of NaOH. What is limiting reagant.... how many grams of water will be produced and how many moles of the excess reagant will be left? Please show work.

2007-04-03 03:32:55 · 2 answers · asked by dl 1

2007-04-03 02:44:27 · 2 answers · asked by abdulmajeed a 1

2007-04-03 02:38:51 · 2 answers · asked by abc 1

I need some help on this problem I've been trying to work out. Any help appreciated. thanks!


Suppose that 0.155 mol PCl5 is placed in a reaction vessel of volume 500.0 mL and allowed to reach equilibrium according to the following reaction:

PCl5 <-> PCl3 + Cl2 (Kc = 1.80 at 250 °C)

What are the equilibrium concentrations of each reactant and product?
(All three substances are gases at 250 °C)

2007-04-03 02:26:31 · 3 answers · asked by AppleCard! 2

2007-04-03 02:17:25 · 14 answers · asked by chinnu 3

Which of these elements would have to gain electrons to become stable?

Ga
Ge
As
Ta
Si
Sn
Te
Kr
Mo

Which of these would have to lose electrons to become stable?

2007-04-03 02:16:00 · 4 answers · asked by TheGreatest 3

I know that hydrogen gas, oxygen, and nitrogen gas have zero charge. but does Br2 has zero charge as well??

2007-04-03 01:55:30 · 5 answers · asked by Anonymous

a. All hydroxides and oxides are insoluble except All Gp 1 elements Sr2+, Ba2+, Ca2+ and ammonium (NH4+)
b. All sulphides are insoluble except for All Gp 1 elements Ca2+ and ammonium (NH4+)

2007-04-03 01:11:38 · 3 answers · asked by me t 1

show me the picture

2007-04-03 00:14:56 · 9 answers · asked by Hanameel I 1

Nitric oxide (NO) reacts with molecular oxygen as follows:
2NO(g) + O2(g) → 2NO2(g)
Initially NO and O2 are separated as shown below. When the valve is opened, the reaction quickly goes to completion. Determine what gases remain at the end of the reaction and calculate their partial pressures. Assume that the temperatures remains constant at 25oC.
I couldn't add subscripts behind the elements, but the numbers behind them are suppose to be subscripts.

2007-04-02 23:58:21 · 2 answers · asked by Sahali 1

Is there a positive test to indentify a tertiary alcohol over water? Note- there is also a primary alcohol present, so it cannot be a general test for alcohols. It's difficult because from my research it seems both tertiary alcohols and water give negative tests for everything. There must be a test though, and I would be very pleased if someone could let me know. Thanks in advance!

2007-04-02 23:56:11 · 1 answers · asked by Anonymous

a. If each pairs of students used a different mass of magnesium, what effect would this have on the percentage composition results? (assume all sources of error are eliminated)

b. What law if your answer in a. based on?

2007-04-02 23:51:55 · 3 answers · asked by Anonymous

2007-04-02 23:28:57 · 2 answers · asked by Anonymous

____Fe^2+ + ____MnO4^- ___ ______ ----->

___Fe^3+ + ___Mn^2+ + ___ ______

2007-04-02 23:26:31 · 3 answers · asked by blhockey91 1

A steady current was passed through molten CoSO4 until 2.27 g of metallic cobalt was produced. Calculate the number of coulombs of electricity used.

2007-04-02 23:22:04 · 2 answers · asked by blhockey91 1

2007-04-02 23:14:47 · 1 answers · asked by sariogluali 1

2007-04-02 22:27:10 · 7 answers · asked by Jose 2

4 a) i) Mass of 3000 moles of Sodium nitrate =
ii) Add the mass of 1000 moles of Lead =
iii) Subtract the mass of 21346 moles
of Helium =

b) i) Mass of 24 moles of Ammonium fluoride =
ii) Add the atomic mass of Hydrogen plus
that of Oxygen =

c) i) Mass of 100 moles of Manganese =
ii) Add the molar mass of Lithium =

2007-04-02 22:13:30 · 1 answers · asked by Joesph P 1

2007-04-02 22:05:32 · 2 answers · asked by sariogluali 1

Is it true that nonpolar molecules cannot be induced to be polar?

Is it also true that a solution is saturated when the solvent molecules can no longer pull apart the solute molecules?

2007-04-02 21:09:59 · 2 answers · asked by cult_king_666 1