Questions asked by Ernest Z.

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• How do you handle significant figures in multi-step calculations?
  
• If endergonic reactions are not spontaneous, how do they occur?
  
• How do I use the algebraic method to balance the equation CaCO₃ + H₃PO₄ → Ca₃(PO₄)₂ + H₂CO₃?
  
• How do I balance the equation for the oxidation of diphenylcarbazide by Cr⁶⁺ to give diphenylcarbazone and Cr³⁺?
  
• What is the energy profile in *cis*- and *trans*-1-bromo-4-methylcyclohexane?
  
• What is the energy profile in *cis*- and *trans*-3-bromo-6-methylcyclohexene?
  
• Later topics may assume some knowledge of earlier topics. Should we worry about the order of chapters and of topics within chapters?
  
• How can I use Excel to create a graph with two vertical axes?
  
• 3NO₂(g) + H₂O(l) → 2HNO₃(l) + NO(g). If 3.9 mol NO₂ and 0.50 mol H₂O combine and react completely, how many moles of the excess reactant are present after the reaction is complete?
  
• #"Z"^-# is a weak base. An aqueous solution prepared by dissolving 0.350 mol of #"NaZ"# in sufficient water to yield 1.0 L of solution has a pH of 8.93 at 25.0 °C. What is the #K_"b"# of #"Z"^-#?
  
• I answer mainly questions in Chemistry, with Algebra sixth in frequency. Yet 48 of the 50 questions in my current Dashboard are from Algebra. Is there a way to filter the questions in the Dashboard according to the responders' interests?
  
• A block of wood 3.0cm on each side has a mass of 27g. What is the density of this block? Answer: 1.0 #"g/cm"^3#.
  
• How can I convert the bond-line structure of 2-methylhexane to a Newman projection viewed along the C3-C4 bond?
  
• How do I calculate the number of theoretical plates in gas chromatography?
  
• What is a Kováts retention index in gas chromatography, and how do I calculate it?
  
• Is it possible to reduce the size of an image imported into Socratic via its URL?
  
• How do we dilute a bacterial culture 50-fold, 100-fold, and 200-fold?
  
• I use MS Word to compose answers on Socratic. Is there a better way?
  
• Often an answer that "needs improvement" is accompanied by a second, completely acceptable answer. Improving a defective answer would make it similar to the "good" answer. What to do …?
  
• How about listing the progress icons on our Dashboard in decreasing order of Levels?
  
• In general, how does Socratic decide which questions/subjects appear in the post-answer pop-ups?
  
• Could you provide links to practice problems on momentum, force, kinetic energy, and friction?
  
• Is there a difference in appearance of subscripts in the sentences in the answer below?
  
• Can you walk through the steps for balancing #"Cr"_2"O"_7^(2-) + "SO"_3^(2-) + "H"^+ → "Cr"^(3+) + "SO"_4^(2-) + "H"_2"O"#?
  
• A highly pure dilute solution of sodium in liquid ammonia … A) has a blue colour; B) exhibits electrical conductivity; C) produces sodium amide; D) produces hydrogen gas, Which of the above answers is/are correct?
  
• What volume of 33% #"HCl"# required to neutralize 8000 gal of 50 % #"NaOH"#?
  
• In a serial dilution, 0.1 mL of serum is added to 1.9 mL of saline in the first tube. The next tubes contain 1.5 mL of saline, and 0.5 mL from the previous tube is added to the next tube. How do we calculate dilution in the next tubes?
  
• Could you derive the rate law for two competing first order reactions and the formula for the product ratio, please?
  
• How many grams of each component do I need in order to prepare a solution containing 75 mmol /L sodium; 65 mmol/L chloride; 20 mmol/L potassium; 10 mmol/L citrate; and 75 mmol /L glucose?
  
• How can I determine the van't Hoff factor of a substance from its formula?
  
• The solubility product constant for #"Mg(OH)"_2# is #1.8 × 10^"-11"#. What would be the solubility of #"Mg(OH)"_2# in 0.345 M #"NaOH"#?
  
• A 2% by weight aqueous solution of NaCl (MW= 58.45) has a boiling point of 100.31 °C. What is the van't Hoff factor for NaCl?
  
• How would you find a balanced equation if acetylene gas (#"C"_2"H"_2#) undergoes combustion to form carbon dioxide and water vapor?
  
• Can you provide the thermodynamic data to show why #"HF"# is such a weak acid compared to #"HI"#?
  
• How do you calculate the osmolarity of seawater?
  
• Can anyone help me with these cyclization questions?
  
• Can anyone help me with these mechanisms for the formation of spiro heterocycles?
  
• How do I use Lewis structures to determine the oxidation numbers of #"N"# in compounds like #"N"_2"O", "NO", "N"_2"O"_3, "N"_2"O"_4#, and #"N"_2"O"_5#?
  
• How does the density of pasta affect the amount of time the pasta needs to cook?
  
• How does the tail-to-tail arrangement affect the process of simple diffusion across the plasma membrane?
  
• Is there an easy way to remember VSEPR shapes?
  
• What is the priority order of factors like resonance, hybridization, solvation, etc. in determining the relative acidity or basicity of compounds in a list?
  
• Is nitric acid the strongest acid and acetic acid the weakest?