Chemistry - December 2007

also... how is each macromolecule used inside the cell?

2007-12-15 13:16:36 · 0 answers · asked by doubleyou93 1

2007-12-15 13:14:33 · 6 answers · asked by doubleyou93 1

2007-12-15 12:51:11 · 5 answers · asked by Linda 1

similarites and differences between diffusion and facilitated diffusion

2007-12-15 12:46:09 · 1 answers · asked by Anonymous

given the speed of light as 3.0 x 10 ^8 m/s, calculate the wavelength of the electromagnetic radiation whose frequency is 7.500 x 10 ^12 Hz.
Please explain how to figure this out!
thanks in advance!

2007-12-15 12:41:03 · 3 answers · asked by hi 3

How many particles are in a 91.0 gram sample of potassium carbonate?

2007-12-15 12:27:41 · 1 answers · asked by Kataya B 1

2007-12-15 12:18:45 · 3 answers · asked by Anonymous

...says that the configuration 1s^2, 2s^2, 2p^5, 3s^2, 4p^1 represents an excited atom. Please explain!

2007-12-15 12:12:36 · 3 answers · asked by Anonymous

Which charge of O2 would give a bond order of O2?
a)-2 b)-1 c) +1 d) two of these f) none of these

A solution is made by dissolving 60.0 g of AlCl3 in enough water to make 250.0 mL of solution. How many moles of ions are in 5.00 mL of solution?

Any help would be appreciated! thank u

2007-12-15 10:08:11 · 1 answers · asked by loone 2

2What is the molarity of 5.00g of NaOH mixed with 550.0 mL of solution?

3How many Moles of NaCl are contained in 10L of a 2M solution?

4What mass of NaCl would be contained in the previous problem?

5Howmany moles of HCl do you have if you have 76 grams?

6Howmany liters of space does one mole of gas occupy at STP?

7How many grams of NaOH are needed to make 500mL of 2.5 M solution?

8How many mL of 6 M HCl is needed to contain 2 moles of HCl

9What are the formula's for the diatomic molecules?

10How many atoms are in one mole of Chlorine at STP?

2007-12-15 10:06:59 · 2 answers · asked by Aaron C 3

I understand the process when there are percentages given, but to just have two elements alone, how do you do it? Mg and N?

2007-12-15 09:36:08 · 4 answers · asked by Anonymous

Can anyone tell me what sort of polyamide is used in a household carpet and what else makes up a carpet besides the polyamide.

2007-12-15 09:35:31 · 3 answers · asked by Anonymous

what are polar, nonpolar, ionic bond, polarity, and intermolecular force?

dont give me dictionary definitions
pls give me in yur words in easy words since im not a native speaker. thank you

2007-12-15 09:32:52 · 3 answers · asked by Hoq Q 1

2007-12-15 09:30:42 · 5 answers · asked by Anonymous

Does water have a lower density compared to milk?
Does that mean..that if I put water in Rocket A, and milk in Rocket B, Rocket A will go higher because water has a lower density than milk...

does that make sense^^?

2007-12-15 09:25:16 · 6 answers · asked by Anonymous

2007-12-15 09:09:47 · 4 answers · asked by golfpro123 1

2007-12-15 08:59:26 · 1 answers · asked by lol 1

Sea water contains roughly 28.0g of NaCl per liter.What is the molarity of sodium chloride in Sea water?

2007-12-15 08:59:17 · 4 answers · asked by Aaron C 3

i have 86 chemistry problems to solve out of those 86 problems I don't understand 6 if you could please help me...I appreciate thanks
1).How much heat must be removed to condense 15.75g H2O(g) at 100 degree C to produce 15.75g h2o(l) also at 100 degree C? Give answer in cal units.
2).A sample of N2 gas at STP occupies a volume of 1250mL. If the temperature and pressure of the gas is raised to 28degree C and 1.35atm respectively, what volume in liters will the gas occupy? Assume that the number of moles of gas is constant.
3)A 2.50L sample of nitrogen gas is at standard pressure and 21 degree celcius. What celcius temperature is required to increase the pressure to 115kPa and reduce the volume to 2.35L? Assume that the amount of gas is constant.
4)Calculate [H+] of a solution of HCl in water havong a pH=3.8. of the solution.
5)If 4.8375kJ of heat is required to warm a solid gold bar from 21degree C to 36 degree C, what is the mass of the bar in grams?

2007-12-15 08:49:09 · 3 answers · asked by Anonymous

the concentration of 15 mL of acetic acid diluted to 250 mL of water is 1.048 M.
what volume of 0.0867 M of NaOH is required to reach the equivalence point?

2007-12-15 08:47:07 · 3 answers · asked by mightyfiiiine 1

Your school club has sold 500 tickets to a chili supper. You have a chili recipe that serves 10. The recipe calls for 2tsps of chili powder. How much do you need for 550 servings?

2007-12-15 08:44:04 · 3 answers · asked by Alybaba 2

I need information on Uranium if anyone can give it to me here.

2007-12-15 07:55:40 · 2 answers · asked by WolfGeneral 3

Which of the two element is the biggest threat?

2007-12-15 07:37:36 · 6 answers · asked by Anonymous

Write the balanced equation for the reaction of magnesium with oxygen gas to form magnesium oxide. Since oxygen is a diatomic element, use O2 in the reaction.

I think that the equation needing to be balanced is Mg + O2 --> MgO. I'm just not sure how to balance it. Thanks for your help!

2007-12-15 07:37:26 · 4 answers · asked by Steven M 3

lease help asap thank u

2007-12-15 06:06:32 · 5 answers · asked by way 2 real 4 these hoez 1

I need to know how to find the number of neutrons and electrons using only the periodic table and how do i do that.

2007-12-15 05:59:48 · 3 answers · asked by siukid42 2

Aluminum is resistant to corrosion because

a.aluminum has a large positive standard reduction potential.
b.the surface of aluminum is coated with unreactive AlN.
c.aluminum is a noble metal.
d.the surface of aluminum is coated with unreactive Al2O3.
e.aluminum contains trace amounts of magnesium and chromium.

2007-12-15 04:20:03 · 5 answers · asked by Anonymous

All of the following combinations of elements or compounds will react to produce hydrogen gas EXCEPT

a.MgH2(s) and H2O(λ).
b.Na2S(s) + HCl(aq).
c.Ca(s) + HCl(aq).
d.Na(s) and H2O(λ).
e.Al(s) + KOH(aq).

2007-12-15 04:15:28 · 3 answers · asked by Anonymous

Mr. D has a cup of tea which is 80 degrees celcius and it takes 25 minutes for it to cool to room temperature (20 d. Celcius). Create a table of values to show the rate of cooling

2007-12-15 04:05:08 · 1 answers · asked by Baby_Lissy<3 1

The building block of silicate minerals is the

a.trigonal-planar SiO3 unit.
b.octahedral SiO6 unit.
c.tetrahedral SiO4 unit.
d.bent SiO2 unit.
e.linear SiO unit.

2007-12-15 03:53:47 · 1 answers · asked by Anonymous