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April 18, 2014

Search: chem101

Number of results: 56

chemistry
rule #2: http://www.seas.upenn.edu/~chem101/oxidationstates.html
Tuesday, September 13, 2011 at 4:57pm by TutorCat

chem101
1.95
Monday, April 5, 2010 at 5:52am by SAM

chem101
ch
Sunday, June 20, 2010 at 3:47am by Anonymous

chem101
It forms NH4^+ + OH^-
Thursday, April 8, 2010 at 6:24pm by DrBob222

chem101
I stand corrected.
Sunday, April 11, 2010 at 3:43am by drwls

chem101
i dont know were to start
Sunday, April 11, 2010 at 3:40am by MAHLATSE

chem101
what is the function of an indicator in a titration
Sunday, April 11, 2010 at 3:41am by kabelo

chem101
Why is CH3CH2NH2 the least acidic?
Sunday, September 11, 2011 at 9:45pm by sammy

chem101
PH=-log[0.01]=1.95
Monday, April 5, 2010 at 5:52am by SAM

CHEM101
Do you have to know accurately the concentration of NaOH?
Friday, February 25, 2011 at 6:33am by Mahlatse

chem101
See your earlier post. I responded there.
Friday, November 30, 2012 at 6:17pm by DrBob222

chem101
Add 0.1 mole of NaOH (4.0 g) to 1 liter of water.
Sunday, April 11, 2010 at 3:43am by drwls

chem101
propyl Bromide reacts with Mg, Propanone, H+ to yeild what?
Saturday, March 26, 2011 at 12:29pm by richard

chem101
will the following reaction take place nh3+h2o= nh2 + h3o
Thursday, April 8, 2010 at 6:24pm by wendy

Chemistry
Is there a reason for why you're allowed only three significant figures for molar masses?
Thursday, February 24, 2011 at 9:41pm by Chem101

SCIENCE(CHEM101)
23.73*.01470=25*M solve for M, the molarity of the gastric juice.
Tuesday, March 8, 2011 at 7:05am by bobpursley

chem101
Calculate the H+ ion concentration given the following pH readings: a) 2.00 b) 9.50 c) 10.40 d)-125(is this a reasonable question neee help
Friday, November 30, 2012 at 1:40am by Akira12

chem101
a 0.1M NaOH solution has been prepared for you.Describe how you would prepare 1 litre of the same solution
Sunday, April 11, 2010 at 3:43am by kabelo

chem101
delta T = i*K*m Since K is a constant it can be ignored and you are interested in the largest number for i*m where i = # particles (which you get from the number of ions) and m = molality.
Sunday, June 20, 2010 at 3:47am by DrBob222

General Chemistry (Chem101)
density of mixture is .4137*2.0514 + .5863*2.6678 = 2.413g/mL so, the density of the object is the same
Thursday, September 20, 2012 at 12:22pm by Steve

chem101
OH^- = 7.76E-9 (H^+)(OH^-) = Kw = 1E-14 Solve for H^+, then convert to pH [pH = -log(H^+)] and see if it is within the brackets set between 5.5 and 5.9 for pH.
Friday, November 30, 2012 at 1:35am by DrBob222

chem101
Which of the following solutes in aqueous solution would be expected to exhibit the LARGEST freezing-point lowering (assuming ideal behavior)? A. 0.1 m NaCl B. 0.2 m CH3COOH C. 0.1 m MgCl2 D. 0.05 m Al2(SO4)3 E. 0.25 m NH3
Sunday, June 20, 2010 at 3:47am by joan

chem101
if 23.74ml of 0.01470M NaOH are required to completely neutralize 25.00ml of gastric juice,calculate the concentration of the hydrochloric acid[in g/L]in stomach gastric juice
Sunday, April 11, 2010 at 3:40am by kabelo

chem101
A 7.2 10-3 M solution of acetic acid is 5.0% dissociated. In a 7.2 10-4 M solution, the percentage of dissociation would be Value A. The same. B. >5%. C. <5%. D. zero. E. none of these. pls explain why the answer is B
Saturday, June 19, 2010 at 12:03am by shahd

chem101
An indicator tells you when you have reached the end point of a titration (where you quit adding titrant). You HOPE (and pray) that the end point is the same as the theoretical equivalence point of the reaction.
Sunday, April 11, 2010 at 3:41am by DrBob222

SCIENCE(CHEM101)
iF 23.74Ml OF 0.01470m nAoh are required to completely neutrize 25.00mL of gastric juice,calculate the concentration of the hydrochloric acid(in g/L )in the stomach gastric juice.show steps and calculations
Tuesday, March 8, 2011 at 7:05am by MAHLATSE

chem101
Both a and b have polar bonds and a net dipole moment. H2SO4 is most acidic. H2O least. CH3COOH is most acidic. CH3CH2NH2 is least.
Sunday, September 11, 2011 at 9:45pm by DrBob222

chem101
I WILL ADD 0.1mol NaOH TO A 1 LITRE VOLUMETRIC FLASK, ADD LITTLE Water to dissolve, and NaOH TO 1 l WATER
Sunday, April 11, 2010 at 3:43am by Mahlatse

chem101
I WILL ADD 0.1mol NaOH TO A 1 LITRE VOLUMETRIC FLASK, ADD LITTLE Water to dissolve, and NaOH TO 1 l WATER
Sunday, April 11, 2010 at 3:43am by Mahlatse

chem101
I WILL ADD 0.1mol NaOH TO A 1 LITRE VOLUMETRIC FLASK, ADD LITTLE Water to dissolve, and NaOH TO 1 l WATER
Sunday, April 11, 2010 at 3:43am by Mahlatse

chem101
I WILL ADD 0.1mol NaOH TO A 1 LITRE VOLUMETRIC FLASK, ADD LITTLE Water to dissolve, and NaOH TO 1 l WATER
Sunday, April 11, 2010 at 3:43am by Mahlatse

chem101
I WILL ADD 0.1mol NaOH TO A 1 LITRE VOLUMETRIC FLASK, ADD LITTLE Water to dissolve, and NaOH TO 1 l WATER
Sunday, April 11, 2010 at 3:43am by Mahlatse

chem101
I WILL ADD 0.1mol NaOH TO A 1 LITRE VOLUMETRIC FLASK, ADD LITTLE Water to dissolve, and NaOH TO 1 l WATER
Sunday, April 11, 2010 at 3:43am by Mahlatse

chem101
I WILL ADD 0.1mol NaOH TO A 1 LITRE VOLUMETRIC FLASK, ADD LITTLE Water to dissolve, and NaOH TO 1 l WATER
Sunday, April 11, 2010 at 3:43am by Mahlatse

chem101
I WILL ADD 0.1mol NaOH TO A 1 LITRE VOLUMETRIC FLASK, ADD LITTLE Water to dissolve, and NaOH TO 1 l WATER
Sunday, April 11, 2010 at 3:43am by Mahlatse

chem101
I WILL ADD 0.1mol NaOH TO A 1 LITRE VOLUMETRIC FLASK, ADD LITTLE Water to dissolve, and NaOH TO 1 l WATER
Sunday, April 11, 2010 at 3:43am by Mahlatse

chem101
I WILL ADD 0.1mol NaOH TO A 1 LITRE VOLUMETRIC FLASK, ADD LITTLE Water to dissolve, and NaOH TO 1 l WATER
Sunday, April 11, 2010 at 3:43am by Mahlatse

chem101
Processed cheese must be at a pH of 5.5 to 5.9 to prevent growth of unwanted microorganisms. If a sample comes back with [OH-]of 7.76e-9 as a control supervisor would you send the cheese back? Justify your answer. My asnswer is no but I don't know how to justify it by showing ...
Friday, November 30, 2012 at 1:35am by Akira12

science
Thank you for using the Jiskha Homework Help Forum. Hopefully, something below will help you: 1. http://www.utmem.edu/physpharm/.003a.html 2. http://en.wikipedia.org/wiki/Crystal 3. (great examples here): http://www.newton.dep.anl.gov/askasci/gen01/gen01503.htm 4. http://www....
Sunday, October 7, 2007 at 12:56am by SraJMcGin

chem101
Processed cheese must be at a pH of 5.5 to 5.9 to prevent growth of unwanted microorganisms. If a sample comes back with [OH-]of 7.76e-9 as a control supervisor would you send the cheese back? Justify your answer. My asnswer is no but I don't know how to justify it by showing ...
Friday, November 30, 2012 at 6:17pm by akira 12

chem101
pH = -log(H+) 2.00 = -log(H^+) -2.00 = log(H^+) (H^+) =0.01M
Friday, November 30, 2012 at 1:40am by DrBob222

chem101
I would answer this based on Le Chatelier's principle. CH3COOH + HOH ==> H3O^+ + CH3COO^- As one adds water, the reaction is shifted to the right. Therefore, the weak acid means more water added which means more ionization.
Saturday, June 19, 2010 at 12:03am by DrBob222

chem101
The NH2 group in organic chemistry is an amine group and they are basic. Think of ammonia, NH3. This is just like ammonia except CH3CH2 roup has been substituted for one of the H on the NH3. The N has a lone pair of electrons which can accept a proton and that makes it a base.
Sunday, September 11, 2011 at 9:45pm by DrBob222

chem101
50.0ml of 0.10M HCL{aq} was added to 40.0ml of 0.10M NaOH{aq} and the mixture was stirred,then tested with a pH meter.What reading should be obtained for pH at 25.0degrees celcias?
Monday, April 5, 2010 at 5:52am by justin

chem101
which of the following compounds have polar bonds and a net dipole moment? a) H3COH b) H3CCOCH3 ALSO PLEASE CHECK THIS, RANK THE FOLLOWING FROM MOST TO LEAST ACIDIC COMPOUND: A)H2SO4>H3CCO2H>H20 B)H3CCH2NH2>H3CCH2OH>H3CCO2H
Sunday, September 11, 2011 at 9:45pm by sammy

chem101
Hydrogen gas can be produced in the lab by the reaction of magnesium metal and hydrochloric acid. Mg + 2 HC -> MgCl2 + H2 How many grams of hydrogen gas will be produce if 5.00 g of magnesium metal is dissolved in excess acid.
Thursday, March 24, 2011 at 3:47pm by richard

chem101
You're batting 1000 on a. Just plug in the numbers for b and c. b. HCl is a strong acid (meaning it ionizes 100%) so HCl ==> H^+ + Cl^- If HCl = 1.0 M then (H^+) must be 1.0 M (and Cl^- must be 1.0 M). c. pH = -log(H^+) pH = -log(1.0) pH = -(0) pH = 0 (Note: I doubt it ...
Wednesday, November 28, 2012 at 9:32am by DrBob222

chem101
I like everything you said as long as you understand that increasing and decreasing the pressure affect ONLY (emphasize only) the gas, CO2. So increasing P makes it go to the side with fewer mols (which is left); decreasing P makes it go to the side with more mols (which is ...
Monday, November 26, 2012 at 5:31pm by DrBob222

chem101
NaOH + HCl ==> NaCl + H2O. moles NaOH = M x L. moles HCl = moles NaOH (since the reaction is 1 mole NaOH to 1 mole HCl). molarity HCl = moles/L. Post your work if you get stuck.
Sunday, April 11, 2010 at 3:40am by DrBob222

SCIENCE(CHEM101)
You need one mole of NaOH to neutralize one mole of HCl. You require 0.02374 L x 0.0147 mole/L = 3.49 *10^-4 moles of NaOH That many moles of HCl have a mass of 1.274*10^-2 g The concentration is (1.274*10^-2 g)/(25*10^-3 L) = 0.510 g/L
Tuesday, March 8, 2011 at 7:05am by drwls

chem101
If a solution contains 0.0100 mole of HCl in 10.0 mL aqueous solution. a.) What is its molarity? My answer is 1M (0.0100 mole/10.0 mL * 1000 mL/1L = 1M) b.) What is H^+ ion concentration for this solution? c.) What is the expected pH for this solution? pls help i don't know ...
Wednesday, November 28, 2012 at 9:32am by audrey12

chem101
The equilibrium under investigation is : H2CO3(aq) * H2O(l) + CO2(g) How does the pulling and pushing of the plunger affects the equilibrium? Is it consistent with LeChatelier's principle? my answer is that if you push you increase the pressure volume decrease and the ...
Monday, November 26, 2012 at 5:31pm by andrew78

chem101
DrWLS didn't REALLY mean that. Those instructions will prepare a 1 molal solution. To be more specific about it, you want to add 0.1 mole NaOH (4.000 grams NaOH) to a 1 L volumetric flask, add some water, swirl to dissolve (it will get hot), let it cool, then add water to the ...
Sunday, April 11, 2010 at 3:43am by DrBob222

General Chemistry (Chem101)
A chemist mixes two liquids A and B to form a homogeneous mixture. The densities of the liquids are 2.0514 g/mL for A and 2.6678 g/mL for B. When she drops a small object into the mixture, she finds that the object becomes suspended in the liquid; that is, it neither sinks nor...
Thursday, September 20, 2012 at 12:22pm by Emily

chem101
HCl + NaOH ==>NaCl + H2O moles HCl to start: M x L = 0.050 x 0.10 = 0.005 moles HCl. moles NaOH to start: M x L = 0.040 x 0.1 = 0.004 moles NaOH. All of the NaOH is used. We have 0.005-0.004 moles = 0.001 moles HCl remain unreacted (HCl) = 0.001 moles/0.100 L = 0.01 M HCl. ...
Monday, April 5, 2010 at 5:52am by DrBob222

chem101
Endothermic reaction equilibrium: BiCl3(aq) + H2O(g) = BiOCl(s) +2HCL(aq) + 2 HCl at a point at which the sollution is colorless and a small minute amoount of BiOCl(s) is observed. for the folowing questions 1to 5: a. state which way the reaction shift in terms of LeChateliers...
Tuesday, November 27, 2012 at 6:15pm by audrey12

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