Questions asked by Courtney G.

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• Convert 355mL of a solution containing 6.31 ppm CaCO3 to mmol?
  
• The Ka of a monoprotic weak acid is #2.08 xx 10^-3#. What is the percent ionization of a .194 M solution of this acid?
  
• You need to prepare 100.0mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa=4.20) and 0.240 M sodium benzoate. How much of each solution should be mixed to prepare the buffer?
  
• 500.0 mL of 0.140 M NaOH is added to 565 mL of 0.250 M weak acid (Ka = 2.92 × 10-5). What is the pH of the resulting buffer?
  
• The edge of a body-centered-cubic unit cell (which contains two atoms per unit cell) of an element Y was found to be #3.16 x 10^-8# cm. The density of the metal is #19.35##g/(cm^3)#. What is the approximate molar mass of Y?
  
• Physics acceleration and velocity homework question?
  
• An object of mass 16 kg is held in place by an applied force F and a pulley system as shown in the figure.  Find the tension T4.  Hint draw a free body diagram for the top pulley and the bottom pulley?
  
• Find acceleration?
  
• Find work?
  
• Find average friction?
  
• Find distance up the incline?
  
• Find coefficient of kinetic friction?
  
• A proton of mass m undergoes a head on collision with a stationary atom of mass 16m.  If the initial speed of the proton is 470 m/s, find the speed of the proton after the collision?
  
• The spin-drier of a washing machine slows down uniformly from 880 rpm (revolutions per minute) to 260 rpm while making  50 revolutions.  Find the angular acceleration through these 50 revolutions.  Express your answer in rad/s2?