General Chemistry Answers

For alanine, Ka1 = 5.1 x 10 -3, Ka2 = 1.8 x 10 -10

 a) Calculate the ratios [Z] / [C

+] and [Z] / [A

−] at pH = 10.50

 b) Calculate the pH when [Z] = [C

+] and when [Z] = [A

−] if pH= - log [H

+]

Consider Teflon, the polymer made from tetrafluoroethylene. 

a) Draw a portion of the Teflon molecule.

b) Calculate the molar mass of a Teflon molecule that contains 5.0 x 104 CF2 units. 

c) What are the mass percents of C and F in Teflon?

How many moles of copper(II) sulfate will react with 16.5 grams of

aluminum?

0.07g of anhydride of carbon occupies 56dm³ at stp when vaporized.and contains 14.29% by mass hydrogen.what is the mass of the hydrocarbon.

What volume in milliliters of a 0.141

MNaOH solution is required to reach the equivalence point in the complete titration of a 9.00

mL sample of 0.122 MH2SO4? 

Which characteristic is given by the principal quantum number?

H2SO4+H2O=2H2O+2O2

How many moles of Cu are needed to react with 5.8 moles of AgNO3?

Cu + 2 AgNO3 → Cu(NO3)2 + 2 Ag

Write the electrochemical shorthand notation for a voltaic cell with the following reactions: (3 marks)

Pb2+(aq) + 2e- ⇌ Pb(s) E = -0.13V

Co2+(aq) + 2e- ⇌ Co(s) E = -0.28V

b) Write down the reaction that occurs at the anode. Is this oxidation or reduction?

c) Which substance would form the negative electrode?

d) What would be the potential difference measured by a voltmeter for this cell?

a sample of hydrogen has an inital twmprature of 50.0 celcius. when the temperature is lowered two -5.0°C the volume of hydrogen becomes 212 cm3 . what was the inital volume of the hydrogen?