Chemistry - March 2007

Need help with this please. someone please explain this to me. thanks!

which contain less heat, ice at 0°C or water at 0°C?


explain why an ice-water mixture will remain at 0°C until all of the ice has melted, even if heat is applied to it??

hope you can help me out! thanks!!

2007-03-12 20:20:03 · 4 answers · asked by Anonymous

2007-03-12 20:04:48 · 2 answers · asked by saravanan k 1

What volume (mL) of 0.446 M potassium hydroxide solution would just neutralize 111.4 ml of 0.121 M H2SO4 solution?

2007-03-12 19:16:14 · 1 answers · asked by ztweakz 1

accounts for only 15% of the mass of this hydrated salt. Explain why water does not amount to 66% of the mass of this hydrate?

2007-03-12 19:09:43 · 5 answers · asked by darkraven_222000 1

hey wat u observe if u apply a charged rod just like u do wit water but instead to a stream of hexane and ethanol?...separately...

2007-03-12 19:06:37 · 1 answers · asked by Anonymous

as you know the rate of reaction between h2so4 and naoh is so high so i couldnt measure it then i searched about it so much but without any result!

2007-03-12 18:58:26 · 2 answers · asked by armin 2

What is the mass of Mg? For example The mass of O is 6.42 in relation to Carbon or something like that

2007-03-12 18:48:03 · 2 answers · asked by Anonymous

In addition to phosphoric acid, what are the products of hydrolysis of lecithin?

2007-03-12 18:22:47 · 2 answers · asked by jjsingh97 2

2007-03-12 18:20:49 · 1 answers · asked by Anonymous

TeCl4 and PO4-3

2007-03-12 18:19:11 · 1 answers · asked by Anonymous

Hey I did this myself but can't get it right.
a) what i did was find the molar mass of H2 in 27g h2O, 2g/27g= .074mol H2

b) i then converted .074mol to # of atoms by multiplying this by Avogadros #, .074 x 6.02e23= 4.54atoms H2 in 27g sample of H2O.

*However according to my homework the write answer is supposed to be 1.81 x 10e24

2007-03-12 18:15:00 · 4 answers · asked by Anonymous

1. CO2

2. H2O

3. CH4

4. NH3

5. CCL4

This stuff is so confusing...Any help would be greatly appreciated.

2007-03-12 18:13:12 · 3 answers · asked by Jenny3360 1

a) triangular planar b) tetrahedral


c) triangular pyramidal d) octahedral


e) triangular bipyramidal f) linear g) angular


A. What is the molecular geometry of a SiF6−2 molecule ?



B. Predict the molecular geometry of H2CO

2007-03-12 17:58:16 · 1 answers · asked by Anonymous

(i) Ionization energy generally increases down the group

(ii) Fe2+( the 2+ is in superscript form) has an electronic configuration of 1s^2, 2s^2, 2p^6, 3s ^2, 3p^6, 3d^4, 4s^2

2007-03-12 17:54:42 · 3 answers · asked by Anonymous

For C2H6 what is the angle of each H-C-H bond, in degrees

2007-03-12 17:51:15 · 2 answers · asked by Pretty Girl 1

Use the following letters corresponding to the molecular shapes to answer part III and IV

a) triangular planar
b) tetrahedral
c) triangular pyramidal
d) octahedral
e) triangular bipyramidal
f) linear
g) angular
h) square planar
i) seesaw
j) T shaped
k) square pyramidal

For the ( iodine-chlorine 3)


I) How many lone pairs of electrons are on the central atom?


II) How many bonds (counting multiple bonds as one)
are on the central atom?


III) What is the molecular geometry of the molecule? (use the above letters


IV) What is the electron-pair geometry? (use the above letters)

2007-03-12 17:45:22 · 2 answers · asked by Pretty Girl 1

Use the following letters corresponding to the molecular shapes to answer part III and IV

a) triangular planar
b) tetrahedral
c) triangular pyramidal
d) octahedral
e) triangular bipyramidal
f) linear
g) angular
h) square planar
i) seesaw
j) T shaped
k) square pyramidal

For the molecule ICl3 ( iodine-chlorine 3)


I) How many lone pairs of electrons are on the central atom?


II) How many bonds (counting multiple bonds as one)
are on the central atom?


III) What is the molecular geometry of the molecule? (use the above letters


IV) What is the electron-pair geometry? (use the above letters)

2007-03-12 17:16:02 · 1 answers · asked by Pretty Girl 1

2007-03-12 16:51:56 · 1 answers · asked by Brittney G 1

What type of bonding would you expect in each of the following?
A) N2(g)
B) Rb(s)
C) ICl3(g)
D) PCl3(l)
E) MgCl2(s)

2007-03-12 16:35:54 · 2 answers · asked by socr8711 2

if im supposed to have 4.5 moles of Oxygen what coefficient do i put in front of the O(2)???

NH(3) + O(2) ----> N(2) + H(2)O.

2007-03-12 16:32:54 · 2 answers · asked by Anonymous

2007-03-12 16:31:36 · 1 answers · asked by cole 1

suppose some nickel (II) sulphate was carefully placed in the bottom of a beaker of water. the beaker was then covered and left for several days. what will happen few hours and several days later? second, explain it with kinetic theory. third, what is the name of the physical process that takes place in this experiments?

2007-03-12 16:30:37 · 1 answers · asked by son_ray 2

Which of the following is the lightest element ? 1)sodium 2)lithium 3)sulfur 4)calcium.Explain with reason.

2007-03-12 16:24:14 · 3 answers · asked by Rajchem 2

2007-03-12 16:15:28 · 6 answers · asked by SCIENCE?? 1

in regards to the evaporation of liquids like water, heptane, hexane, ethanol, methanol, propanol, butanol, and pentane

2007-03-12 16:14:21 · 3 answers · asked by Matt K 2

I heard it can cause something called siliconosis. I'm worried because i bought a vial to play around with and don't want to threaten my lungs.

2007-03-12 16:10:11 · 4 answers · asked by Leonid R 2

Write the balanced equation for the production of oxygen gas and potassium chlorine from the decomposition of potassium chlorate.

Write the balanced equation for the combustion of propane (C3H8) to produce carbon dioxide and water vapor.

Write the balanced equation for the reaction that occurs between aluminum and fluorine.

2007-03-12 16:04:57 · 5 answers · asked by mz. * 1

And will Sodium Sesquicarbonate neutralize battery acids?

2007-03-12 15:52:48 · 2 answers · asked by Cyrinos 4

Write a balanced equation representing the formation of aqueous sulfuric acid from water and sulfur trioxide gas.

Write a balanced equation for the following word equation.
phosphorus + oxygen --> tetraphosphorus decoxide

2007-03-12 15:51:49 · 2 answers · asked by mz. * 1

If so where can I find answer?.

2007-03-12 15:48:29 · 2 answers · asked by George T 1