Chemistry - August 2007

What observations would you see when you mix a Potassium Sulphate Solution with these respectively:
1. Barium Chloride Solution
2. Dilute Hydrochloric acid
3. Barium chloride solution followed by dilute Hydrochloric acid

Also, what would you observe when you mix these three substances respectively with Potassium Sulphite Solution.

P.S- If you know the answer how did you get to it? From the equations?
Thankyou

2007-08-06 02:21:54 · 2 answers · asked by Questioner 1

organic chemistry

2007-08-06 02:09:49 · 3 answers · asked by Anonymous

2007-08-06 01:15:30 · 1 answers · asked by maki 1

I am really struggling to understand how you can determine if a molecule is polar or not through its symmetry and vector sum. Plzzzz help me understand this.

2007-08-05 21:59:17 · 2 answers · asked by ArabianFalcon 2

2007-08-05 21:14:43 · 3 answers · asked by Anonymous

why should i use pencil in marking rather than ballpen

2007-08-05 20:58:09 · 1 answers · asked by Anonymous

2007-08-05 19:07:19 · 2 answers · asked by DiMaHaZiaF 1

The density of potassium bromide, KBr, is 2.75 g/cm3 and it has the same structure as NaCl. A cubic unit cell consists of 4 K+ and 4 Br- ions. The atomic weights of K and Br are 39.1 and 79.9 respectively. Calculate the edge length of the unit cell a.


A. 0.702 nm
B. 0.564 nm
C. 0.354 nm
D. 0.416 nm
E. 0.660 nm

2007-08-05 18:30:10 · 1 answers · asked by waterlooguy 2

2007-08-05 16:48:47 · 1 answers · asked by SILVIA C 1

2007-08-05 15:56:31 · 7 answers · asked by sweetgirl78228 2

A student measures the potential of a cell made up with 1 M CuSO4 in one solution and 1 M AgNO3 in the other. There is a Cu electrode in the CuSo4 and an Ag electrode in the AgNO3, and the cell is set up in a "voltmeter." She finds that the potential, or voltage, of the cell, E^0cell, is 0.45 V, and that the Cu electrode is negative

a)At which electrode is oxidation occurring?
b)Write the equation for the oxidation reaction.
c)Write the equation for the reduction reaction.

d)If the potential of the silver, silver ion electrode, E^0Ag+, Ag is taken to be 0.000 V in oxidation or reduction, what is the value of the potential for the oxidation reaction, E^0Cu, Cu2+oxid? E^0cell=E^0oxid + E^0red.

e) If E^0Ag+, Agred equals 0.80 V, as in standard tables of electrode potentials, what is the value of the potential of oxidation reaction of copper, E^0Cu, Cu2+oxid?

f) Write the net ionic equation for the spontaneous reaction that occurs in teh cell that the student studied.

Help

2007-08-05 13:45:48 · 1 answers · asked by Anonymous

>The FW of anhydrous CaCl2 is 111.0, so FW for CaCl2 dihydrate would be 147.0 (yes or No)
>If you had a protocol that called for 50g. anhydrous CaCl2, how would you make this solution using anhydrous CaCl2.
50mM/1000mL X 111.0 g = 5.55 g of CaCl2 to be dissolved in 1L vessel.
>How would you make this solution using CaCl2 dihydrate ?
50mM/1000mL X 147.0 g = 7.35 g of CaCl2.2H20

I will appreciate your input.

2007-08-05 10:44:19 · 1 answers · asked by Austin B 1

Diameter of the column: 1.5 cm
Cross sectional area of the column (cm^2): A = π r^2 = π (1.5 cm)^2 = 7.07 cm^2
Height of the column bed: 16.76 cm
Volume of bed:??

2007-08-05 09:24:56 · 3 answers · asked by Anonymous

If the Buret was dirty
If the Buret tip was not completely filled with NaOH when titration began
You forgot to add Phenolphthalen indicator

2007-08-05 08:38:26 · 3 answers · asked by Stacey D 1

2007-08-05 07:44:45 · 7 answers · asked by Anonymous

net internal negative charge
net internal positive charge
net internal nuetral charge

2007-08-05 00:12:45 · 2 answers · asked by AROD 2

a. C2H6
b. C3 H8
c. C2H2
d. C4 H10

Could you explain how u detemine a compound to be the most reactive?

please the numbers they are subscripts

2007-08-04 22:17:05 · 6 answers · asked by Anonymous

Is there a collective term for both of them?

2007-08-04 22:04:13 · 13 answers · asked by Anonymous

Should it be written with an O2 or H2?

2007-08-04 21:06:02 · 3 answers · asked by edelweiss 2

2007-08-04 20:59:29 · 2 answers · asked by Anonymous

A method needs 2.5% (w/v) sodium acetate. You need to make up 200ml but you only have the hydrated form (CH3COONa3H2O mol. Weight 136). How much would you weigh out?

If you can show me the working I would be greatly appreciated! Or even just a hint

2007-08-04 20:57:52 · 2 answers · asked by chengdu 1

2007-08-04 20:42:14 · 9 answers · asked by rosinta s 1

2007-08-04 20:41:17 · 5 answers · asked by naval k 1

2007-08-04 20:31:40 · 10 answers · asked by rosinta s 1

what is the principle behind it???

2007-08-04 20:17:57 · 3 answers · asked by Anonymous

Keq= FeSCN2+/((Fe3+)(SCN-))

2007-08-04 20:14:11 · 2 answers · asked by :) 1

any article about it? i need some answers :)

2007-08-04 20:02:57 · 4 answers · asked by Creative 2

In an spectrophotometric determination of equilibrium constant for a reaction,
why is diluted 0.20M Fe(NO3)3 in 0.1M HNO3 is used as the blank reagent instead of distilled water which has zero absorbance?

2007-08-04 19:44:53 · 2 answers · asked by :) 1

hey guys for our chemistry class we need to test and prove the properties of carbon dioxide. so for example, to prove its odourless we smell it, stuff like that. but i need some tests for the more complicated properties such as co2 can extinguish fires and so on. if you have any ideas please reply! thanks

2007-08-04 19:43:06 · 4 answers · asked by aiisha_jamini 1

Is SiO2 is being extracted on industrial level any where or its only a part of laboratory work. Does any body know about its price? please tell me!

2007-08-04 18:19:17 · 2 answers · asked by usman a 1