Chemistry - April 2007

I know this sounds very elementary to you guys, but I was wondering how I would say these two units in words?

Like when I am talking to a doctor about my test results: "This chemical is measured in ........."

Thanks for the reply to whomever answers :- )

2007-04-15 10:40:55 · 1 answers · asked by aarjop 1

Is it because Acid and Base come together, thus becoming neutralized?

2007-04-15 10:39:10 · 7 answers · asked by RobertH 1

2007-04-15 10:38:31 · 4 answers · asked by Anonymous

i need to kno this for my science project but everywhere i look it has a different answer.
PLEASE HELP!

2007-04-15 10:27:51 · 3 answers · asked by Anonymous

2007-04-15 10:26:02 · 2 answers · asked by Rafael 1

How much of crude oil production goes toward the production of polymers? What percentage of crude oil is used to produce polymers..

2007-04-15 10:19:27 · 1 answers · asked by IDK 1

What is the molarity of 111 grams of KOH (formula weight = 56.1 u) in 1.25 liters of solution?

2007-04-15 10:18:48 · 4 answers · asked by Anonymous

What is the final concentration of NaOH when 335 mL of .75 M NaOH are mixed with 165 mL of .15 M NaOH?

Please explain how you came with the answer

2007-04-15 10:16:52 · 1 answers · asked by Anonymous

This question was posed by my chemistry teacher.

Copper metal is dipped into a 0.01M silver nitrate solution. Calculate the concentration of silver ions in the final equilibrium solution.

I have no idea how to do this

2007-04-15 10:15:04 · 1 answers · asked by Anonymous

1) hydrogen-ion concentration
hydroxide-ion concentration
basic solution
ion-product constant for water
Basic solution because all other terms refer to the quantity of the hydrogen and hydroxide ions.

2) basic
neutral
acidic
hydronium ion
Hydronium ion because all other terms describe different types of solutions and the concentrations of H+ and OH- and the nature of a substance.

3) acidic solution
hydroxide ion
basic solution
alkaline solution
Acidic solution because an alkaline solution is a basic solution and the hydroxide ion is dominant in alkaline/basic solutions.

4) pH
dissociation constant
hydronium ion
hydroxide ion
Dissociation constant because hydronium ion and hydroxide ion are related to pH.

Can someone tell me if my answers are correct and if the explanations are accurate? If they aren't accurate or don't make any sense, can you provide any suggestions? Thanks in advance.

2007-04-15 10:07:26 · 1 answers · asked by mz. * 1

how many liters of H2 gas at STP are produced when Zn react with 250ml of 3.00M HCl?

please help and show work thanks

2007-04-15 09:52:13 · 1 answers · asked by mrs. me 2

For the next two questions use the below information:


polydentate ligands result in more stable complex ions
then do monodentate ligands


An example of formation equilibrium for a complex ion in solution is:

Al3+ + 6F− ↔ [AlF6]3− Kf = 5.0 × 10−3


ΔG = −RT ln( Kf )


remember, the more negative the value the of ΔG the more stable
are the products of reaction that are formed




Which of the following are true statements ?


a) en stands for ethylenediamine, a bidentate ligand


b) The subscript f in Kf stands for 'free energy'


c) A very small value of Kf for a chemical reaction in which a coordination complex
is a product would indicate that the complex formed is a relatively stable one


d) A very large value of Kf for a chemical reaction in which a coordination complex
is a product would indicate a relatively small decrease in Gibbs free energy

2007-04-15 09:52:01 · 2 answers · asked by mahbubur r 1

First one is:How many moles of Cr(OH)3 will dissolve in 1.00 L of a solution with a pH of 7.63. (Assume the pH does not change as the Cr(OH)3 is placed in the water.) Second one is:Calculate the standard entropy in J/mol*K for the reaction: CaCO3(s) ® CaO(s) + CO2(g) Given:S°(CaCO3(s)) = 92.9 J/mol*K,S°(CaO(s)) = 40J /mol*K DS°(CO2(g)) = 213.6 J/mol*K. I have tried to calculate the standard entropy and it keeps on tellin me I 'm wrong. Can you tell me where I went wrong on this question. I took 40 J/mol*K because it is CaO entropy number and added it to 213.6 J/mol*K because that it CO2 entropy number then I subtracted 92.9 J/mol*K from CaO and CO2 put together and I got 160.7 kJ/mol*K and it told me I was wrong could please explain to me where I went wrong and tell me the correct answer Third one is: Estimate the value of the equilibrium constant, K°, at 1200 K for the reaction: 2 SO2(g) + O2(g) ® 2 SO3(g) SO2(g)H° -296.83 S°248.22, SO3(g) H° -395.72 S°256.7 O2(g) H° 0 S°205.14

2007-04-15 09:45:31 · 3 answers · asked by bhjesusfreak101 2

2007-04-15 09:38:21 · 2 answers · asked by raerae 1

KHC8H4O4 (aq) + NH3 (aq) ?
potassium hydrogen phtalate + ammonia? any1 kno da full reaction?

2007-04-15 09:25:32 · 1 answers · asked by Dreamz 2

If for the reaction N2(g) + O2(g) ↔ 2NO(g), you have the initial concentration [N2] = 0.03 and [O2] = 0.08, and if Keq for the reaction at this temperature is 5.7 x 10^-7, then what are the equilibrium concentrations for N2, O2, and NO2?

2007-04-15 09:22:42 · 1 answers · asked by theweirdguy1 2

If the pH of a 1.7 x 10^-3M solution of Codeine (C18H21NO3) is 9.59, calculate Kb.

How do i do it??
thanks!

2007-04-15 09:20:12 · 1 answers · asked by Nicole S 1

Could someone please help me explain what amphoteric means using H2S as an example? Thanks for any help!

2007-04-15 09:12:03 · 1 answers · asked by immageek 1

Hydrogen is found primarily as two isotopes in nature: H1 (1.0078u) and H2( 2.0140u) Calculate the percentage abudnace of each isoptope based on hydrogen's average mass. How would i do this.

2007-04-15 09:08:15 · 3 answers · asked by Boss Playa 1

1. If 11.4mL of 0.100Molar MgCl2 is needed to completely react 15.0mL of AgNO3 solution, what is the molarity of the AgNO3 solution?
MgCl2 (aq)+2AgNO3(aq) ->2AgCl(s)+Mg(NO3)2(aq)

2. How many liters of H2 gas at STP are produced when Zn react with 250mL of 3.00M HCl?
Zn(s)= 2HCl(aq) -> ZnCl2(aq)=H2(g)

please help i also need to show work so if you can walk me through it that would be awsome!!! thanks so much

2007-04-15 09:06:08 · 3 answers · asked by mrs. me 2

2007-04-15 09:06:06 · 1 answers · asked by DIANA B 1

What is the name of this? sorry I can't use the proper marking, but I trust that you get what I mean...( the letters should be higher than the numbers- don't know how to do that with a computer though..) thanks for help-really appreciate it.

2007-04-15 09:03:53 · 1 answers · asked by fredriqa 2

Is the the decompostion of gaseous dinitrogenpentoxide to gaseous nitrogen dioxide and oxygen exothermic or endothermic? If possible explain why.

THANKS!!!!!

2007-04-15 08:50:55 · 1 answers · asked by Anonymous

1) what is the biological function of hemoglobin?

2) why is important that hemoglobin binds O2 reversibly rather than irreversibly?

3)Why is important that hemoglobin binds CO reversibly rather than irreversibly?

4) what is the rol of nitrate and nitrite in water pollution as it relates to hemoglobin. What hazard does this pose for humans

2007-04-15 08:42:25 · 1 answers · asked by ? 1

Ca(OH)2 + NH4Cl --> NH3 + CaCl2 + H2O

i went at it for a whiile...and still can't get it...maybe the equation is wrong....well...ist from:
The slaked lime (Ca(OH)2) is added to the aqueous ammonium chlroide to produce ammonia, aqueous calcium chlrodie and water...

2007-04-15 08:36:24 · 4 answers · asked by no name 1

An 0.874g sample of cortisol was subjected to carbon-hydrogen combustion analysis. 2.23g of carbon dioxide and 0.652g of water were produced.

What is the emprical formula??

molar masses:
Carbon-12.000
Hydrogen-1.008
Oxygen-16.000

2007-04-15 08:23:13 · 3 answers · asked by C'est Comme Un Rêve 3

2007-04-15 08:20:08 · 4 answers · asked by RunmanJr2 2

2007-04-15 08:12:17 · 4 answers · asked by Anonymous

2007-04-15 07:54:50 · 2 answers · asked by Anonymous

2007-04-15 07:49:04 · 2 answers · asked by muji m 1