Chemistry - August 2007

2007-08-28 12:12:24 · 1 answers · asked by Dhoopy 3

why is it that a pH of 3 is more acidic than somehting with a pH of ten

2007-08-28 12:02:38 · 4 answers · asked by bynumbrodrick 2

i read the text, but didn't understand a thing...if possible please explain a little so a dummy like me can understand..... thnk u =]

2007-08-28 11:43:09 · 4 answers · asked by w00t w00t 1

1. Where do electrons lost by metal atoms during the formation of ions come from?
a) The highest occupied energy level.
b) The lowest occupied energy level.
c) The inner shell.

2. The electronic structure of aluminium is 2,8,3 - what is the electronic structure of an aluminium ion, Al³+?
the + should be on the same size as 3 and it is after it.
a) 2,8,3+
b) [2,8,3]+
c) [2,8]³+

Please explain the answers after you answered them that will be really helpful. thanx

2007-08-28 10:32:48 · 2 answers · asked by Anonymous

2007-08-28 08:55:41 · 5 answers · asked by Laurel D 1

a.cooling is proportional to temperature.
b. cooling is proportional to the square root of temerpature.
c. cooling is proportional to the square of temperature.
d. cooling is proportional to the fourth power of temperature.
e. cooling is proportional to temperature to the power one quarter.

2007-08-28 08:04:03 · 6 answers · asked by sikhism4life88 1

2007-08-28 07:49:00 · 2 answers · asked by Anonymous

a. 3 meters per 1000 yrs
b. 30 meters per 1000 yrs
c. 300 meters per 1000 yrs
d. 3 kilometers per 1000 yrs
e. 30 kilometers per 1000 yrs.

2007-08-28 06:43:12 · 4 answers · asked by sikhism4life88 1

What will the reaction be?

If sulphuric acid is used instead of hydrochloric acid, what would be the salt formed?

2007-08-28 06:08:27 · 4 answers · asked by Booyah! 3

mass spectrometer

2007-08-28 05:47:58 · 7 answers · asked by Anonymous

2007-08-28 03:34:48 · 1 answers · asked by alex b 1

If a 1.77g sample of zinc is heated with excess sulfur to form 2.64g of zinc sulfide. Calculate the mass of sulfur used.

2007-08-28 03:17:31 · 3 answers · asked by Anonymous

Deuterium is an isotope of hydrogen. The abundance of deuterium in water is 0.015%. How many moles of water would be required to obtain 0.074 moles of deuterium (D subscript2)?

2007-08-28 03:16:08 · 4 answers · asked by Anonymous

What is the mass number of an iron atom that has 31 neutrons?

2007-08-28 03:14:22 · 2 answers · asked by Anonymous

2007-08-28 02:55:39 · 5 answers · asked by iqnabeel 1

2007-08-28 01:14:43 · 1 answers · asked by Anonymous

melting points of organic compounds that ranges between 112-120 degree celcius?

2007-08-28 01:09:13 · 4 answers · asked by christopher o 1

Nitrogen--- -196 Degree Celsius

Argon--- -186 Degree Celsius

Oxygen--- -183 Degree Celsius


A mixture of oxygen, nitrogen and argon at -200 Degree Celsius is allowed to warm up grudually by 16 Degree Celsius. Which of the substances will still be in the liquid state?


The answer is oxygen only.

But why is oxygen only? I don't understand...Can anyone explain this question to me? Thanks a lot. =)

2007-08-27 22:36:42 · 3 answers · asked by ♪£yricảl♪ 4

how many atoms would be included in 1 gram of hydrogen atoms? and how many atoms would be included in 2 grams of hydrogen molecules? how do you figure this out?

2007-08-27 16:36:31 · 3 answers · asked by confused 2

i always thought hydrogen bonding was electrostatic, but 2day my professor said it also has covalent properties. can u explain what this means?

2007-08-27 16:02:59 · 5 answers · asked by Nicholas 1

2007-08-27 15:56:28 · 1 answers · asked by Anonymous

2007-08-27 15:28:49 · 2 answers · asked by gummy_bear_103 1

Hydrogen cyanide is produced industrially from the reaction of gaseous ammonia, oxygen, and methane:

2NH3 (g) + 3O2 (g) + 2CH4  2HCN (g) + 6H2O (g)

If 5.00 x 10^3 kg each of NH3, O2, and CH4 are reacted, what mass of HCN and of H2O will be produced, assuming 100% yield?

2007-08-27 15:28:29 · 2 answers · asked by Anonymous

Why is it ,for instance, that calcium which has 20 electrons uses 4 energy levels when it only really needs 3? i mean i was always taught in the first level there were 2, 2nd 8, 3rd 18, 4th 32, ect. ect. y does calcium only put 8 in the 3rd and have 2 in the 4th?

2007-08-27 15:22:06 · 3 answers · asked by Nicholas 1

liquid oxygen

2007-08-27 15:11:00 · 2 answers · asked by rv_rave 1

1. how do you calculate ionization energies for elements in kj/mol, i need to find out what element has the first ionization energy of 600kj/mol, 2nd ionization energy of 1800. please explain what the formula is and how to solve it.

2. why does nitrogen have higher ionization enery than oxygen. is it because of
a. effective nuclear charge
b.greater penetration of the nitrogen p orbitals
c. a crowding effect of the electrons
d. the extra neutrons of oxygen
e. or the half filled subshell of nitrogen
im guessing its either b. or e.

2007-08-27 14:59:22 · 3 answers · asked by Protons 2

-thank you in advance

2007-08-27 12:10:52 · 4 answers · asked by Tammy 2

This is for a school project-

I need to find out professions that use each different branch of chemistry (organic, inorganic, physical, analytical, bio, and theoretical). They don't have to be strictly chemistry professions, just professions that use chemistry. Can anyone help me?

2007-08-27 12:08:50 · 2 answers · asked by MagicGirl* 2

2007-08-27 11:48:44 · 2 answers · asked by Anonymous

thanks

2007-08-27 11:12:19 · 1 answers · asked by Katrin 1