Questions asked by Kevin B.

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• When I try to mark a question as a duplicate, I get a message that the URL is not valid. What's going wrong?
  
• How do you find the value of the limit as x approaches infinity of #sqrt(x^2+x+1)-x# by hand?
  
• What is the limit of #sqrt(4-x^2)# as #x# approaches #2#?
  
• The data below were collected for the following reaction at a certain temperature: #X_2Y→2X+Y# (Data found as picture in answer box). What is the concentration of #X# after 12 hours?
  
• Why do new shoes squeak?
  
• If #15.0mL# of glacial acetic acid (pure #HC_2H_3O_2#) is diluted to #1.50L# with water, what is the pH of the resulting solution? The density of glacial acetic acid is #"1.05 g/mL"#
  
• Why do bananas bruise?
  
• Which of the following compounds should have the strongest conjugate acid? (See choices in answer).
  
• Which of the following statements is true when comparing the following two hypothetical buffer solutions? (Assume HA is a weak acid.) (See choices in answer).
  
• Assuming equal concentrations, which of these salt solutions should have the highest pH? (Choices in answer).
  
• In a certain mystery liquid, the compounds #Al_2S_3#, #K_3N#, #Na_2S#, and #RbBr# each have a value of #Ksp = 1.0 xx 10^-10#. Which of these solids should be the least soluble in the mystery liquid? (Choices in answer).
  
• What is Infinity?
  
• Thorsten the geologist is in the desert, 10 km from a long, straight road. On the road, Thorsten's jeep can do 50kph, but in the desert sands, it can manage only 30kph. How many minutes will it take Thorsten to drive through the desert? (See details).
  
• On August 12, 2000, the Russian submarine Kursk sank to the bottom of the sea, approximately 95 meters below the surface. Can you find the following at the depth of the Kursk?
  
• What is the speed of the block when it has moved a distance of 0.0200 m from its initial position? (At this point the spring is compressed 0.0190 m). See details.
  
• What is the magnitude of the acceleration of the block when it is at the point #x= 0.24 m#, #y= 0.52m#? What is the direction of the acceleration of the block when it is at the point #x= 0.24m#, #y= 0.52m#? (See details).
  
• If the rod makes one revolution every 0.736 s after the puck is caught, what was the puck's speed just before it hit the rod? (See details).
  
• What happens to the positron after positron emission (beta plus decay)?
  
• How do you evaluate the following limit: #lim_((x,y,z)->(-1,0,4)) ((x^3-ze^(2y))/(6x+2y-3z))#?
  
• Why are mussels not abundant above and below the littoral zone?
  
• What are defensins?