Answers edited by Michael

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• Question #85621
  
• #sf(""^24Na)# undergoes #beta# decay. A 208g sample decays such that 13g remain. What is the 1/2 life ?
  
• Question #2f5b5
  
• What is the difference between "atom economy" and "percentage yield" ?
  
• Question #8b920
  
• What is the density of 25 mL, 0.10 M sucrose solution? I divided 342.18g (C12H22O11)/ 25mL. Did I do this correctly or no?
  
• Question #3063a
  
• Question #92c3e
  
• How can I calculate the activation energy of a reaction?
  
• Question #0b65e
  
• Question #c3e63
  
• Question #57ca8
  
• Where does reduction occur in a galvanic cell?
  
• Question #f421c
  
• Question #71b91
  
• Question #579b0
  
• What is the equation of the tangent to the line #sf(y=ln(x^2-8)# at the point (3,0) ?
  
• Question #2257e
  
• How do I use the algebraic method to balance the equation CaCO₃ + H₃PO₄ → Ca₃(PO₄)₂ + H₂CO₃?
  
• How can I calculate galvanic cell potential?
  
• What is the difference between enthalpy of formation and bond enthalpy ?
  
• Question #3046a
  
• What does 6mmol/l mean in blood glucose ?
  
• Question #85335
  
• Why is the uncertainty principle not significant when describing the behavior of macroscopic objects, but it is very significant when describing the behavior of electrons?
  
• How many molecules of water in #"6.25 g"#?
  
• Question #179ac
  
• Why is dissolving potassium nitrate in water an endothermic process ?
  
• At 25°C in a closed system, ammonium hydrogen sulfide exists as the following equilibrium. NH4HS(s)<--->NH3(g) + H2S(g) When a sample of pure NH4HS(s) is placed in an evacuated reaction vessel and allowed to come to equilibrium at 25°C, total pressure is 0.660 atm. What is the value of Kp?
  
• A galvanic cell has two solutions: solution one is 0.3 M FeCl2, solution two is 1.7 M MgCl2. The electrode in solution one is Fe and the electrode in solution two is Mg. The temperature is 85 °C. What is the spontaneous cell potential in this setup?
  
• What is the electron configuration of aluminium?
  
• Question #6ad4d
  
• Question #4f49b
  
• Why is a neutralisation reaction exothermic?
  
• How does aluminium form an ionic bond with chlorine ?
  
• Question #7216f
  
• Question #4edb4
  
• Question #3177e
  
• Question #30c09
  
• Question #5613f
  
• Why does iron(II) oxide react with aluminium even though it is stable?
  
• How do you calculate the number of ions in a solution?
  
• Question #4056c
  
• What is the electron configuration of chromium?
  
• Question #2a4cc
  
• 6 ml of an ideal gas is at a temperature of 250 K. What temperature is required to produce a volume of 9 ml at constant pressure ?
  
• What is the theoretical yield of sodium chloride for the reaction of 36.0 g Na with 75.2 g Cl2 of the following 2NA+Cl2---> 2NaCl? I keep getting stuck with my conversions. I started with 36.0g NA (1 mol Na/22.99g Na) (1 mol Cl2/2mol Na) =0.782 mol Cl2.
  
• Question #73939
  
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