Posts by ts
Total # Posts: 34
If the reaction rate increases by 2.6 when the temperature increases from 20-30 degrees Celsius, what is Ea? Do we use 2.6 in place of (k2/k1) or multiply something by 2.6? Lost, please help.
January 27, 2017
Rule of thumb gives the activation energy of most organic reactions as approximately 50 kJ/mol. Based on that, calculate by what factor the reaction rate increases when the temperature climbs from 25°C to 45°C. 1. 3.6 2. 3.2 x 1046 3. 1.001 4. 1.3
June 21, 2016
A sample of beer is 4.6 % by mass C2H5OH. The density of beer is 0.93 g/ml. What is the molar concentration of C2H5OH in this sample of beer? a. 9.7 x 10-4 b. 1.13 x 10-4 c. 0.975 M d. 1.13 M I did 0.046x930 g/L =42.78 mass alcohol 42.78/molar mass of C2H5OH (46.068) = 0.928 ...
June 14, 2016
HCl is slowly added to a solution that is .250 M in Pb^2+ and .00150 M in Ag+. Which precipitate forms first, PbCl2 or AGCl? At what Cl- ion concentration will the precipitate first appear? Ksp for PbCl2= 1.6*10^-5, Ksp for AgCl= 1.7*10^-10 Seriously don't understand Ksp ...
May 9, 2016
a) A weak acid, HX, is 1.3% ionized in .20 M solution. What percent of HX is ionized in a .030 M solution? b) Does the percent ionization increase or decrease upon dilution? c) Does the H3O+ concentration of the above weak acid increase or decrease?
April 18, 2016
Okay so Im doing a compare & contrast essay on key events that changed the Unites States between 1776-1870 Of course im going to include the creation of the US Constitution. But, I'm having a hard time coming up with the "before & after" effect? What exactly ...
October 23, 2015
At the market close on February 19, 2010, McDonald's Corporation had a closing stock price of $64.74. In addition, McDonald's Corporation had a dividend per share of $2.05 over the previous year. Determine McDonald's Corporation's dividend yield. (Round to one ...
June 8, 2013
What is the total stockholders' equity based on the following account balances? Common Stock $450,000 Paid-In Capital in Excess of Par 90,000 Retained Earnings 190,000 Treasury Stock 10,000 Answer A.$740,000 B.$730,000 C.$720,000 D.$640,000
June 8, 2013
Samuels, Inc. reported net income for 2011 is $105,000. During 2011 the company had 5,000 shares of $100 par, 5% preferred stock and 20,000 of $5 par common stock outstanding. Samuels earnings per share for 2011 is Answer $4.00 $5.25 $6.50 $5.00
June 8, 2013
the process of charging a conductor by bringing it near another charged object and then grounding the conductor is called... a) charging by contact b) induction c) charging by polarization d) neutralization which one of the following statements is true concerning the madnitude...
March 29, 2011
unterstanding operating systems
Given that main memory is composed of three page frames for public use and that a seven-page program (with pages a,b,c,d,e,f,g) requests pages in the following order: a,b,a,c,d,a,e,f,g,c,b,g
November 6, 2010