I already have my answers but need some verification:

 

1) Find the pH of solutions from the given values:

a) If [H] ^+  = 1.25 x 10^{- 6}, find [OH] ^- concentration. Remember [OH^-1 ] = 1x10^-14 / [H^+ ]

 

 

 

[OH^-1 ] ____________________

 

b) Now, find the pH of the above solution in (a)

 

 

 

Ans ____________________

 

2) Change the following pH to [H]^{+ Â} 

^   a) pH 8.25

 

 

 Ans _________________

 

b) Is it acidic, basic or neutral?

 Ans. ________________________

 

3) Identify acid- base conjugate pair; Write acid or base on the left; conj acid or conj base on the right side on the lines below each equation.

 

a)  H PO₄^-2   +      HCl               <===>      H₂ PO₄^-1_          _{+      Â} Â Cl^-

 ^{                                                                          Â} Â Â Â Â Â Â Â Â Â Â ^{          Â} 

    ______________   _______________    _______________ ______________

 

b) HPO₄^-2            +   NH₃                  <====>   PO₄^-3_   +           NH₄⁺

  _________         ____________                   _________      ____________

 

Which chemical specie is amphoteric ( acid and base both) ___________

 

  4) Arrange the following acids based on K_a values, from the strongest to the weakest acid.

 

Acid                         Ka

 

a) HF                        3.5 x 10^{-4 Â} 

b) H₂ SO_{4                      Â} Â too large

c) HCN                   4.9 X 10 ^-10 

d) H_2 CO₃               4.3 x 10^-7

 

Answer   ___________________________________________________________________

 

             weakest                                                                                                           strongst   

 

      5) Predict if each one will make a good buffer pair or not?

Why?

 

a) H_2 BO₃/ HBO₃^-1____________________________________________________________

 

b)  HNO_3 / NO₃^ -1_{                  Â} Â Â ______________________________________________________________

 

6) In question 5) above tell;

 

a) Which acid is the strong acid? ______________

 

b) Which conjugate base is stronger base ? ______________

 

7) Calculate the number of moles of Krypton gas that occupies a volume of 12.3 Liters at a temperature of 99.0^ 0 C

 (change it to K ) and a pressure of  445 Torr (1 atm = 760 Torr.)

[ R = 0.0821 L, atm / mol, K]

 

 

 

 

 

 

 

Ans. ___________________    

 

8) Give a mathematical expression(equations) for;

 

a) Charle's law _______________    b) Avagadro's  Law _____________________

 

c) Ideal gas Law __________          d) Dalton's Law ___________________

 

9) A 150 ml of gas at 36.80 atm and 30.0^0 C (Change to Kelvin) is heated to 59.2⁰C ( change to K) and the volume increased to 405mL. What is the new pressure?

 

 

 

 

 

 

Answer _______________________

 

10-a) In a mixture of helium and oxygen gases, what is the partial pressure of helium in torr , if the partial pressure of oxygen is 198 torr Hg and the total pressure of both gases is 475 torr.

 

 

 

 

Answer ______________________

 

10-b) What volume is occupied by 32.04 grams of CH_4 at STP (1 mol = 22.4L)

 

 

 

Answer _____________________

 

                                                                                                                                                                            

11) a) Write 1 equation for each type of decay. The symbols for the three radiations below:

 

 i) Alpha decay   ____________________

 

ii) Beta (⁰_-1 e) emission  ____________________

 

iii) Positron (⁰₊₁ e) emission _______________________________

 

iv) Gamma  Radiation  _____________________________

 

b) i) Which one is the most penetrating ? _________________________

 

ii) Which one is the least penetrating ? ___________________________

 

12) If 100. mg of fluorine-18 is shipped at 8:00AM, the half life being 110 minutes, how much fluorine-18 is still active after 220 minutes?

 

 

 

 

 

 

Answer ___________________________

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Status NEW Posted 27 Apr 2017 02:04 AM My Price 15.00

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