Chemistry - November 2006

How many orbitals are completely filled in an atom whose electron configuration is 1s22s22p63s1 ??

2006-11-01 11:03:17 · 3 answers · asked by Theo Z 2

does a substance get colder when its freezing?

2006-11-01 10:56:59 · 8 answers · asked by Anonymous

Questions:

1- Write the electron configuration for an atom that has 13 electrons.

2- Write the electron configuration for an atom that has 33 electrons.

2006-11-01 10:53:31 · 4 answers · asked by Theo Z 2

Following a practical I have plotted concentration in mol dm-3 against time on a graph.

I need to calculate the rate of diffusion using the figures I have.

If I select two points on the graph

ie at 15 minutes the concentration value is 1.57 x 10 to power -6

and at 105 minutes the conc. is 5.5 x 10 to power -6


would I work out the rate of diffusion per minute in the following way?

(5.5 - 1.57) divided by (105 - 15)

I'm not great with using powers either so could someone please explain

thankyou!

If you need any other info please let me know

2006-11-01 10:51:58 · 1 answers · asked by jane 62 1

2006-11-01 10:51:23 · 1 answers · asked by george m 1

The barometric pressure is 751 mm Hg.
What is the pressure of the gas sample in Pascals ?

2006-11-01 10:45:30 · 2 answers · asked by simonkf2002 1

how do you count atoms?

2006-11-01 10:28:45 · 6 answers · asked by lil_flirt_57<3 2

1. The frequency and wavelength of all waves are:
a. directly related
b. inversely related
c. unrelated
d. equal

2. The SI unit of cycles per second is called a :
a. photon
b. quantum
c. hertz
d. hund

3. Among the following groups of atoms, which have the same outer energy level configurations?
a. H,He
b. Li,Be,N,Ne
c. Mg,Al,Ca,Ga
d. N.P,As,Bi

4. The wavelength of light with a frequency of 2.50 x 10^13 x s^-1 is:
a. 1.20 x 10^5 m
b. 8.33 x 10^5 m
c. 1.20 x 10^-5 m
d. 8.33 x 10^-5 m

5. Once the electron in a hydrogen atom absorbs energy, it:
a. is now in its gound state
b. is now in its excited state
c. has released a photon
d. none of these

2006-11-01 10:27:03 · 4 answers · asked by Anonymous

2006-11-01 10:24:53 · 3 answers · asked by Anonymous

Hydrolysis is the reaction of a substance with water to form an acid or a base. Does washing soda, Na2CO3, hydrolyze in water?

pH of washing soda was found to be 9.

2006-11-01 10:18:48 · 3 answers · asked by Ev'rybody Know Me 3

plz show ur work


thx

2006-11-01 10:12:28 · 0 answers · asked by Huda H 2

LM004

It takes 208.4 kJ of energy to remove 1 mole of electrons from an atom on the surface of rubidium metal. What is the maximum wavelength (in nm) of light capable of removing a single electron from an atom on the surface of rubidium metal?

2006-11-01 10:00:33 · 1 answers · asked by proxima32578 1

I need to find an Image of Acid/Base in water.
What color would u expact the litmus paper to turn with RAINWATER, AMMONIA?
Predict the products if u add KCl to AgNO3?
What hapen if u add Fe metal to a solution of Zn^+2 ions?
How does a battery works using oxidation/reduction reaction?

2006-11-01 09:51:56 · 2 answers · asked by INDI 2

List at least one. I have a periodic table of elements, I just want to know what everyone else knows. Also give the first person to make one.

2006-11-01 09:45:12 · 6 answers · asked by Donovan G 5

Also list its element symbol.

BONUS QUESTION: Who came up with the first Periodic Table.
(Last name only)

2006-11-01 09:28:44 · 8 answers · asked by Donovan G 5

2006-11-01 09:20:22 · 20 answers · asked by KU 4

Which of these has the lowest concentration of hydrogen ions: 0.1 M HCL, 0.1 M NaOH, 0.1M H2SO4, pure water? explain your answer.

2006-11-01 09:20:13 · 3 answers · asked by SphinxEyez999 2

2006-11-01 09:10:52 · 2 answers · asked by Anonymous

2006-11-01 09:05:24 · 2 answers · asked by Kpeezy 1

2006-11-01 08:59:40 · 2 answers · asked by Anonymous

the reaction system: CS2 (g) +4H2 (g) yields CH4 (g) +2H2S(g) is at equilibrium. What would describe the behavior of the system if the partial pressure of hydrogen is doubled? As equilibrium reestablishes, would the : a) pressure of CS2 increase, b) pressure of CH4 decrease, c) pressure of H2 decrease, d) pressure of H2S decrease, or e) all the pressures will decrease???

2006-11-01 08:22:48 · 1 answers · asked by loveboatcaptain 5

If you want 10 points b the 1st to answer this for me; thanks. :D

2006-11-01 08:21:01 · 2 answers · asked by Joyce 4

2006-11-01 08:10:19 · 6 answers · asked by i<3WL 2

2006-11-01 08:00:35 · 9 answers · asked by Anonymous

Describe and explain why the properties of gallium are considered to be unusual, identifying the properties that suggest gallium is a metal and those that suggest it is a non-metal

(in 200 words)

2006-11-01 07:34:20 · 2 answers · asked by Lora-F 1

The equilibrium constant Kc for the reaction:
A(g) + B(g) yields C(g), is 0.76 at 150 degrees C. If 0.800 mol of A is added to 0.600 mol of Bin a 1.00 L container at 150 degrees C, what will be the equilibrium concentration of C?

2006-11-01 07:33:37 · 2 answers · asked by loveboatcaptain 5

I'm looking for one reffering absolutely to molecular spectros and struction of chemical combinations such as [Co(NH3)6]Cl3?
thx in advance!

2006-11-01 07:28:29 · 1 answers · asked by noname3911 1

2006-11-01 07:25:23 · 8 answers · asked by homedawg252 1

In a titration 25cm3 of ammonia solution react with 33.3 cm3 of 0.1M HCL. What si the concentrationof the ammonia solution in grams dm3??

2006-11-01 07:22:43 · 1 answers · asked by Joyce 4

25cm3 of a solution of 0.2M of KOH reacts with 30cm3 of a solution of nitric acid. (KOH + HNO3 ---> KNO3+ H20)
My final answer was 4.1 mols dm3 of nitric acid/KNO3 is it correct?? :s plz help

2006-11-01 07:16:25 · 1 answers · asked by Joyce 4