Answers edited by Sam

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• What is the Henderson-Hasselbalch equation? How is it used in chemistry?
  
• The product of two consecutive even integers is 168. How do you find the integers?
  
• What is the equation to find pH and pOH?
  
• What kind of reaction is #2Fe(s) + O_2(g) -> 2FeO(s)#?
  
• What is the number of moles in 9.63 L of #H_2S# gas at STP?
  
• How do you write #f(x)=-x^2+4x+6# in vertes form?
  
• What is the Lewis structure of #BF_4^-#?
  
• What is the heat capacity of a piece of wood if 1500 g of the wood absorbs 67,500 joules of heat, and its temperature changes from 32°C to 57°C?
  
• At approximately what pressure will water be a vapor a 0°C?
  
• What is half chair conformation?
  
• Question #7ee1d
  
• How do you do addition reactions of alkenes?
  
• How do you solve #x(x-9)+20=0#?
  
• If the mole fraction of #NaCl# in an aqueous solution is 0.0927, what is the percent by mass of #NaCl#?
  
• What is the vertex form of #y=4x^2-x+4#?
  
• Question #269de
  
• What is the pH of a 0.85 M #NH_4Cl# solution?
  
• How do you graph #r^2 theta=1#?
  
• Question #19605
  
• What is the standard cell notation of a galvanic cell made with silver and nickel?
  
• Polonium-214 has a relatively short half life of 164 s. How many seconds would it take for 8.0 g of this isotope to decay to 0.25 g?
  
• The pH of a solution is 5.6. What are the hydrogen and hydroxide concentrations?
  
• A 100.0 mL sample of .10 M #NH_# is titrated with .10 M #HNO_3#. What is the pH of the solution after the addition of 150.0 mL of #HNO_3#?
  
• How do you solve #2(6 - x) = x(x + 5) # using the quadratic formula?
  
• How do you name cycloalkanes with halogens?
  
• How do you graph #r^2= - cos theta#?
  
• You have a compound that is composed of 62.0 grams #C#, 12.15 grams #H#, 13.771 grams #O# and 12.059 grams #N#. What is its empirical formula?
  
• How many grams of #Cl# are in 515 g of #CaCl_2#?
  
• Question #e901d
  
• What is the #"pH"# for #2.5 xx 10^(-6) "M"# #"HCl"#?
  
• What volume of 0.0500M KOH solution is required to completely neutralize 3.0 mL of 0.17M H2SO4?
  
• How do you prove #cos(x+y)cos(x-y)= cos^2x - sin^2y#?
  
• How do you graph # [sin x] #?
  
• How do you name meso compounds?
  
• How do you write an equation of a line going through (1,2) (-1,2)?
  
• How do you find vapor pressure?
  
• How are aldehydes different from ketones?
  
• How do you graph #r^2=2sin(3θ)#?
  
• How do you write the point-slope form of the equation below that represents the line that passes through the points (−3, 2) and (2, 1)?
  
• What is the standard form of the equation of the parabola with a directrix at x=5 and a focus at (11,-7)?
  
• What is the lewis structure of #NO^+#?
  
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