Saturday
April 19, 2014

Search: Cemistry

Number of results: 35

cemistry
how to identify bond angles
Wednesday, January 25, 2012 at 6:55pm by chemistry

cemistry
what information is provided by the atomic mass?
Wednesday, December 8, 2010 at 5:53pm by bre

cemistry
Practice it enough that you have it memorized.
Wednesday, January 25, 2012 at 6:55pm by DrBob222

cemistry
thx but wat is a good way to remember it
Wednesday, January 25, 2012 at 6:55pm by chemistry

cemistry
what is an equation for ascorbic acid and sodium hydrogen carbonate?
Friday, October 22, 2010 at 3:40am by Mary

Cemistry
Yes, (NH4)2 + H2O are the products of the reaction. Yes, you need to balance it.
Friday, March 16, 2012 at 4:51pm by DrBob222

Cemistry
Can an object experience both a physical and chemical change at the same time?
Tuesday, September 14, 2010 at 11:24pm by Jim

cemistry
what results should we expect when we incubate a variety of lipids of differnet degrees of saturation with iodine?
Sunday, December 11, 2011 at 8:09pm by Sharon

Cemistry
I strongly suspect that H2OCO3 should have been H2CO3. Is that correct as written or did you make a typo?
Friday, March 16, 2012 at 4:51pm by DrBob222

Cemistry
Will a fluoride concentration of 1.0 mg/L be soluble in a water containing 200 mg/L of calcium?
Sunday, October 21, 2012 at 8:19pm by John

Cemistry
Why do we have to heat KMnO4 solution when we have to do the titration with the oxalate ions for such reaction?
Tuesday, May 18, 2010 at 4:46pm by Tukana

Cemistry
Mostly its for the increase in reaction rate for the permanganate to oxidize the oxalate ion. Another reason could be, but it isn't a huge one, to help rid the solution of the CO2 oxidation product.
Tuesday, May 18, 2010 at 4:46pm by DrBob222

cemistry
when 2.13 moles of C3H8 burn in excess oxygen, how many moles of CO2 will be formed? Assume this is a complete combustion
Sunday, October 30, 2011 at 8:06pm by christopher

CEMISTRY
pH = -log(H^+) = approxmately 1E-6 Solve for (H^+). ..........HX ==> H^+ + X^- initial...0.1.....0......0 change...-x.......x......x equil...0.1-x.....x.......x Ka = (H^+)(X^-)/(HX) Then dGo = -RTlnK
Tuesday, May 1, 2012 at 8:15pm by DrBob222

Cemistry
When a 0.952 g sample of an organic compound containing C, H,and O is burned completely in oxygen, 1.35 g of CO2 and0.826 g of H2O are produced. What is the empiricalformula of the compound?
Thursday, September 29, 2011 at 6:02am by Eddy

cemistry
True. Sorry I'm french, so I kinda did a translation from all I learned in french. I mixed up mass number and atomic mass.
Wednesday, December 8, 2010 at 5:53pm by ~Proch~

Cemistry
This is what i found for ksp CaF2<--> Ca(2+) +2F(-) Ksp=(x)(4x^2) where x=solubility Therefore, Ksp=3.7 x 10^-11 and for Qsp I am not sure how to go on about calculating that.
Sunday, October 21, 2012 at 8:19pm by John

cemistry
balance the equation. C3H8+ 5O2 >>4H2O + 3CO2 moles O2= 5/1 * 2.13 moles I strongly recommend you learn to spell chemistry.
Sunday, October 30, 2011 at 8:06pm by bobpursley

CEMISTRY
Consider a weak acid HX. If a 0.10 M solution of HX has a pH of 5.87 at 25C, what is ΔG for the acid's dissociation reaction at 25C?
Tuesday, May 1, 2012 at 8:15pm by Sarah

Cemistry
Look up Ksp for CaF2. Calculate Qsp = (Ca^2+)(F^-)^2 and compare with ksp. You will need to change 1.0 mg/L to mols/L and 200 mg/L to mols/L.
Sunday, October 21, 2012 at 8:19pm by DrBob222

Cemistry
A solution is 36% silver nitrate (AgNO3) by mass. The density of this solution is 1.44 g/mL. The formula weight of AgNO3 is 170 g/mol. Calculate the molality of AgNO3 in this solution.
Wednesday, June 9, 2010 at 10:07pm by Swagato

college cemistry
What is the pH for the solution made from 11.10 mL of 0.278 M HCl solution mixed with 70.90 mL of 0.1300 M ammonia solution ? Note that the pKa for NH4+ is 9.241 8.94 9.24 8.77 9.72 9.54
Thursday, May 27, 2010 at 7:01am by Lucinda

Cemistry
Dr. Bob, you are correct I made a typo the reactants are NH4OH (aq) + H2CO3 (aq). My answer is still the same as above. Is my answer correct? I have not balanced it yet. Also,I believe there is no reaction, due to being weak electrolytes.
Friday, March 16, 2012 at 4:51pm by Julie

Cemistry
Probably the same atom can not; however, it should be possible that a sequence of physical change then a chemical change could occur and some atoms/molecules could be undergoing one while other atoms were undergoing the other.
Tuesday, September 14, 2010 at 11:24pm by DrBob222

cemistry
I'm not sure I buy the explanation by Proch. Proch's explanation correct for "mass number" but not atomic mass. The atomic mass is the weighted average of the masses of all of the isotopes of an element.
Wednesday, December 8, 2010 at 5:53pm by DrBob222

Cemistry
I don't see why not. For example a piece of carbon (charcoal) burning in an oxygen atmosphere. The carbon atoms will undergo a physical change in the they start in the solid phase and end up in the gas phase as CO2, and also undergo a chemical change.
Tuesday, September 14, 2010 at 11:24pm by Dr Russ

Cemistry
If you have a chemical reaction in equilibrium and add more of the product...what happens to the product's concentration, if it doesn't increase? Does it stay the same or decrease a little? I know the reactants concentration will increase and if it is an endothermic reaction ...
Friday, February 19, 2010 at 5:56pm by Connie

college cemistry
Hi Lucinda: This is a buffer: pH = pKa + log [base] / [acid] pH = 9.241 + log [70.90 x 0.1300] / [ 11.10 x 0.278] = 9.72 For future questions, I can be reached at (559) 709-2022 or zdarakjian atgmail dotcom Thank you Zareh Darakjian, Ph.D. University of California Researcher, ...
Thursday, May 27, 2010 at 7:01am by Zareh

cemistry
The atomic mass minus the atomic number = the number of neutrons. Let's take Sodium Mass - number = number of neutrons 23 - 11 = 12 The atomic mass is also used in mole calculation of substances.
Wednesday, December 8, 2010 at 5:53pm by ~Proch~

Cemistry
Hi, I've been trying to solve this chemical equation for the last 30 minutes and am only confusing myself. I am wondering if the product I obtained is correct. The question is to write a balanced equation for the below reaction and be sure to indicate the states and if there ...
Friday, March 16, 2012 at 4:51pm by Julie

Cemistry
36% AgNO3 means 36 g AgNO3/100 g solution. 36 g = 36/170 moles = ?? 100 g solution = volume x density. Calculate volume. Then M = moles/L soln.
Wednesday, June 9, 2010 at 10:07pm by DrBob222

Cemistry
Convert 1.35g CO2 to g C. Convert 0.826 H2O to g H Add gC+gH and subtract from 0.952 to obtain g O. Now convert g each to moles. moles = grams/molar mass Find the ratio of each element to one another with the lowest number being 1.00. The easy way to do that is to divide the ...
Thursday, September 29, 2011 at 6:02am by DrBob222

Cemistry
Change 1 mg/L F^- to mols/L. Change 200 mg/L Ca^2+ to mols/L. Then substitute those values into Qsp = (Ca^2+)(F^-)^2 = ? (By the way, DON'T multiply F^- by 2; i.e., substitute mols/L for F^-.) Then compare Qsp with Ksp. If Qsp is larger than Ksp, a ppt occurs. If Qsp is less ...
Sunday, October 21, 2012 at 8:19pm by DrBob222

cemistry
Read about VSEPR theory http://www.google.com/search?q=vsepr+theory&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Wednesday, January 25, 2012 at 6:55pm by DrBob222

Cemistry
A + B ==> C + D at equilibrium If more C is added to the equilibrium mixture, the reaction will shift to the left. You KNOW concn A will increase, you KNOW concn B will increase, and you KNOW concn D will decrease. What many students wonder about, is what happens to C. ...
Friday, February 19, 2010 at 5:56pm by DrBob222

Pages: 1

Search
Members