Chemistry - November 2007

2007-11-26 05:00:01 · 1 answers · asked by danasha 1

I need a step by step guide on ionic equations (have have no idea how the charges change)- e.g.
CaCo3 + HNO3 ---> Ca(NO3)2 + CO2 + H2O

2007-11-26 02:29:42 · 2 answers · asked by Anonymous

What are breeder reactors? How are they different from regular reactors? And what are the advantages/ disadvantages of them?

2007-11-26 02:21:14 · 3 answers · asked by ~XxRyanxX~ 1

how do i do the equation (e to the 1.5th power) on a scientific calculator?

2007-11-26 01:57:50 · 2 answers · asked by Mandy G 3

A) Cl2(g) + 2K(s) → 2KC (s)
B) KCl(s) → K+(aq) + Cl- (aq)
C) KCl(s) → K+(g) + Cl-(g)
D) KCl(s) → K(s) + Cl-(g)
E) KCl(s) → K(s) + Cl(g)

2007-11-26 01:55:40 · 2 answers · asked by Christina S 1

2007-11-26 01:53:24 · 4 answers · asked by Becky 1

2007-11-26 01:36:54 · 1 answers · asked by Anonymous

teacher mentioned caroll lehrman principle

2007-11-26 01:31:23 · 3 answers · asked by Anonymous

A sample of cobalt-60 has an activity of 24 Bq. The back ground count is 6 Bq.
The half life of cobalt-60 is 5 years. How long will it take for the sample to reach a safe level of activity?

2007-11-25 20:26:25 · 3 answers · asked by Anonymous

2007-11-25 19:28:20 · 4 answers · asked by Gideon 1

Equation CaO+H2O-->Ca(OH)2
Question: how much calcium hydroxide will be produced when 10g of calcium oxide reacts with 3g of water?

I belive rather than having to covert from grams to moles there is an alternate method:
CaO+H2O-->Ca(OH)2
56.08g : 18.01 g
10.00g : Xg now I am unsure what to do from here!
12.34g is the final answer
Any help on this alternate method is appreciated

2007-11-25 18:42:44 · 2 answers · asked by Gideon 1

2. Calculate the density of air in g/L, assuming air is 20.0% O2 and 80.0% N2,at the temperature and the pressure of the laboratory.

Knowns and some of the work done:
Barometric Pressure. 760.3mmHg
1.00039atm.

Temp: 297.7K

Ptotal=PO2+PN2

1.00039x.2=.200079 atm O2
1.00039x.8=.800316 atm N2

R=.08206

2007-11-25 18:28:35 · 2 answers · asked by jeir35 2

Is this some type of hint----> (1000pa=1 kpa)

2007-11-25 18:22:21 · 3 answers · asked by Anonymous

how are endothermic and exothermic reactions related to loss or gain of heat

2007-11-25 15:36:26 · 2 answers · asked by Corey R 2

Fermentation is a complex chemical process of wine in which glucose in fruit is converted into ethanol and co2
C6 H12 O6 --->2 C2 H5 OH (I) + 2 C02 (g)
Startin with 500.4g of glucose, what is the maximum amount of ethanol (in grams and liters) that can be obatained by the process? (Density of ethanol =0.789g/mL

2007-11-25 14:43:39 · 2 answers · asked by jamie d 2

hey sorry about the wording. here it is: when a piece of metal oxidizes, which metal out of (aluminum, zinc, iron, and copper) does the oxide layer protect the remaining metal from further damage best. this is for my ap chem test which is due tomorrow, so it would be greatly appreciated if you could help. thanks

2007-11-25 14:38:49 · 2 answers · asked by nick 1

The crystal structure of MgAl2O4 contains cubic closest packed anions (O2-) with Al3+ cations in some of the octahedral holes, and Mg2+ cations in some of the tetrahedral holes.
1)What is the number of nearest neighbour oxide ions in the crystal for Al3+?
2)What is the number of nearest neighbour oxide ions in the crystal for Mg2+?

2007-11-25 14:34:35 · 1 answers · asked by Anonymous

1 PbS

2 Co(NO3)2

3 (NH4)2SO4

2007-11-25 14:03:48 · 4 answers · asked by Anonymous

A. K
B. I2
C.Hg
D.Mg

2007-11-25 14:00:43 · 2 answers · asked by Anonymous

HCI + Cu (Then theres a arrow pointing to the products) CuCI(A small 2) + H(small 2)

2007-11-25 13:59:38 · 4 answers · asked by Pee Wee's Girl 1

what exactly does it do?

2007-11-25 13:41:21 · 2 answers · asked by gypsy 3

Cleaning up after the Thanksgiving festivities, you have a bucket of ammonia solution in the kitchen. Your little cousin comes in and pours her glass of cranberry juice right into the bucket of ammonia. To everyone's surprise it turns from bright red to blue as it hits the ammonia.

Being an astute chemistry pro, what would your explanation for this curious observation be? Can you think of a way to really impress everyone by turning the solution from blue to red again?

2007-11-25 13:30:35 · 2 answers · asked by Kimberly L 1

does CO2, H2O, CH4, C2H4, or PH3 have the largest dipole moment? i would guess c2h4, but i am not sure.

and, out of:
PbSO4, CuO, KMnO4, KCl, FeCl3
Which:
>is purple in aqueous solution?
>is white and very soluble in water?

2007-11-25 13:22:50 · 2 answers · asked by missingfeet 2

with methylene chloride.

2007-11-25 13:17:39 · 4 answers · asked by ? 4

2007-11-25 13:16:51 · 2 answers · asked by Guy B 1

1 Devise a measure of solute concentration that you would place on the label for the following case: You weigh out 2.56g of zinc iodide. you put the solid zinc iodied in a 500mL flask and fill the flask with water to the 500mL mark. you now have 500mL of a zinc iodide aqueous solution. on the label of the flask you write:


2. Two students need zinc iodide that is in solution in the following amounts;
student 1: 0.43g of zinc iodide
Student 2. 5.0x10^-4 moles of zinc iodide.
for each case use your 500mL of zinc iodide solution in exercise 1.

2007-11-25 13:06:47 · 2 answers · asked by Neha G 1

4Al + 3O2 --------> 2Al2O3

2007-11-25 12:46:59 · 2 answers · asked by Minette S 1

i want to prepare 100mL of a 0.125M solution of zinc iodide from the stock solution. how would i do this? assume you have a 100mL flask availabe. this is called a dillution. it is crucial that you be able to do this type of calculation.
how many moles of solute are you going to want to end up with the 100mL solution?
. how many milliliters of solution are you going to need to take from the stock solution to get the moles in a?

2007-11-25 12:34:19 · 2 answers · asked by Anonymous

please help
i dont understand this.
thanks

2007-11-25 12:23:15 · 2 answers · asked by sally.webs 1

2007-11-25 12:16:47 · 47 answers · asked by ? 1