Chemistry - January 2007

2007-01-09 20:28:20 · 10 answers · asked by Myrah ( 1

I did a lab about Voltaic Cells, and the predicted voltages for the cells are different from the predicted voltages. On the other hand, one of the questions on the lap paper is “suggest reasons for any discrepancy between the predicted voltages for the cells and the observed voltages.”
I have tried to find the reasons, but I can’t find any. Could you please help me?

2007-01-09 19:16:37 · 3 answers · asked by Kameliya 2

and would this increase in concentration increase the chances of acid precipitates? please quote the source if possible

2007-01-09 18:45:31 · 2 answers · asked by chicken_run98228 1

Pharmacy course for Malaysia University and college. Thank u!

2007-01-09 18:41:58 · 5 answers · asked by Anonymous

Just wondering. I need to know this for a chemistry project and I want to make sure that there is no major difference so I don't blow myself up or something.

2007-01-09 17:02:15 · 3 answers · asked by blakeh210 2

periodic table soduim

2007-01-09 16:58:09 · 15 answers · asked by sarahmejia 1

do u have know anything that can make me understand chemistry better, or atleast make it easier or the like.. i really dont get it. and im starting yr 12 this year.

2007-01-09 16:51:07 · 3 answers · asked by Anonymous

1.) Identify which of the following are examples of chemical
equilibrium:

a.) 2NO2 <==> N2O4

b.) 2H2O <==> 2H2 + O2

c.) N2 + 3H2 <==> 2NH3 + heat

d.) H2 + I2 <==> 2HI

2007-01-09 16:50:18 · 7 answers · asked by Pearl 2

1.) Identify which of the following are examples of chemical
equilibrium:

a.) 2NO2 <==> N2O4

b.) 2H2O <==> 2H2 + O2

c.) N2 + 3H2 <==> 2NH3 + heat

d.) H2 + I2 <==> 2HI

2007-01-09 16:39:48 · 2 answers · asked by Pearl 2

please answer me by 2 night... thank you

2007-01-09 15:55:00 · 5 answers · asked by Gomennasai Usagi On'nanoko 2

2007-01-09 15:51:53 · 7 answers · asked by Person 1

How does its prodcution and use have an impact in our standard of living and on the environment for phenol??anyone knows??if so , please help.....i cant really find any info abt tat....thank you very very much..!!hope wont take too long..

2007-01-09 15:47:32 · 1 answers · asked by Anonymous

2007-01-09 15:39:23 · 2 answers · asked by Anonymous

Waht else could i wash the shirts in but a washer?My teacher said i cant use washer but when im ready to test the detergents what else could i was it in?????????

2007-01-09 15:33:53 · 2 answers · asked by Yeahhhh 4

Ammonia is a base. Why can't Arrhenius theory be used with respect to ammonia?

2007-01-09 15:23:27 · 4 answers · asked by Nikki S 1

1. Acetylene gas, C2H2, is produced as a result of the following reaction:
CaC2+2H2O=C2H2+Ca(OH)2
a. If 32.o g CaC2 are consumed in this reaction, how many moles of H2O are needed?
b. How many moles of each product would form?

2. When sodium chloride reacts with silver nitrate, silver chloride precipitates. What mass of AgCl is produced from 75.0 g AgNO3?

3. Carbon and oxygen react to form carbon monoxide: 2C+O2=2CO. What masses of carbon and oxygen are needed to make 56.0g CO? Which law does this illustrate?

Please help. I've been working on chemistry ALL evening...I just can't get these few. Thanks.

2007-01-09 15:23:03 · 2 answers · asked by Anonymous

a.Balance using either method you learnt (oxidation numbers or ion-electron method)
b. Indicate oxidizing agent
c. Indicate reducing agent

2007-01-09 15:22:02 · 1 answers · asked by Nikki S 1

a. UO2 to the exponent 2+
b.CuCl
c.H2C2O4
d.CNO-
e.HV2O7 to the exponent 3-

2007-01-09 15:19:04 · 2 answers · asked by Nikki S 1

What is the moleculare formula for the coumpouns whoe empirical formula is CH(small2)O an dhas a molar mass of 90.0 g/mol

how many moles are in .247 grams of irom II oxide

2007-01-09 15:11:57 · 3 answers · asked by brucelee135 1

please help how do i name these compounds

PdSO3

NH4OH

W2(CrO4)5

2007-01-09 15:08:15 · 2 answers · asked by Anonymous

hi, in a bond like H2O2 or SOs, H, or S can only share 2 electrons. But the other elemnt, such as the two oxygens need 4 electrons. the same with O2, it needs 4 electrons but S can only give 2, what would be the Lewis Dot structure and how would they form a bond? With a single, douple or triple bond?

2007-01-09 14:47:26 · 1 answers · asked by Anonymous

Can someone tell me what Hydrogen, Chlorine, and Sodium have in common besides being Elements.

2007-01-09 14:36:21 · 5 answers · asked by mortifiedpengn 3

2007-01-09 14:34:52 · 3 answers · asked by bulls 1

Hi, does any one know what the Lewis electron dot diagram would be for O3? Would it consist of 3 Os each with a single bond or 3Os together in a triple covalent bond?
please help- 10 pts to first good answer( or which ever 1 makes the most sense lol_

2007-01-09 14:30:37 · 4 answers · asked by Anonymous

(a)Balance using either Oxidation numbers or ion-electron method
b)indicate oxidizing agent and reducing agent

2007-01-09 14:29:32 · 3 answers · asked by NOMHLE N 1

it can right, because until it reaches abosolute zero, it has the potential to keep getting colder

2007-01-09 14:23:29 · 8 answers · asked by Anonymous

2007-01-09 14:04:59 · 5 answers · asked by Anonymous

I need help with one that says Determine whether the following reactions show an increase or decrease in entropy? 2NO(g)->N (subscipt 2)(g) + O (subscript 2)(g). I think it would increase and if i am wrong why?

2007-01-09 14:03:44 · 3 answers · asked by Yahoo! User 4

2007-01-09 14:03:01 · 2 answers · asked by d. clocks 1

what is the definition for nodal surface?

2007-01-09 14:02:29 · 3 answers · asked by Robin F 1