16. (WCSU25., 6 points) Draw two constitutional isomers having the formula C4H8O.  Use two different functional groups and label them by name.   Enter the number of sigma bonds in one isomer below:

21.  (WCSU25.) The ocean is said to contain one hundred trillion million dollars of gold (Au) in the form of gold(III) chloride.  For decades, chemists (and wannabes) have attempted to precipitate gold from seawater, albeit unsuccessfully.  One method would be to form an insoluble gold salt. Then, by a redox reaction, reduce the gold ions to pure gold ($$$!). a.  (6 points) In theory, sodium hydroxide could be used to precipitate gold from seawater.  Write the net ionic equation for the reaction below. Start with the complete ionic equation and identify spectators. AuCl3(aq)    +   3 NaOH (aq) ⟶  Au(OH)3 (s)     +    3 NaCl (aq)   b.  (4 points) Provide an alternative anion to hydroxide that could be used to precipitate gold in a similar reaction.  Write the formula of the insoluble product.  Explain in a few words how you selected the ion.   c. (12 points) You want to test the reaction in the lab before you head out to the ocean.  Calculate the mass (in g) of solid gold hydroxide (MW = 247.99 g/mol) that would form if 30 mL of a 0.200 M AuCl3 solution was mixed with 0.75 g of solid NaOH (MW = 40.0 g/mol). SHOW ALL WORK.   d.  (5 points) Calculate the percent yield if 0.98 g of precipitate are formed. (If you are unable to reach an answer in part c, you may use 3.0 g as the theoretical yield.)   Enter the percent yield in the box below.

The neurotransmitter systems that are involved in schizophrenia:

What are the mechanisms that allow the second generation of antipsychotics to have little in the way of Extrapyramidal Side Effects (EPS), yet still be effective at treating psychosis?

24.  (WCSU25.) Strategies to convert methane to methanol may be useful to produce quantities of methanol for use as a fuel alternative to gasoline. a.  (4 points) Write a chemical equation where ΔHf = ΔHrxn for the formation of methanol (CH3OH) b.  (4 points) If the heat of formation of 1 mol of CH3OH is -201.3 kJ, calculate the heat exchanged when 43 g are formed?   Enter the heat calculated in part b below.

20. (WCSU25., 8 points) You are developing a new fluoride-containing mouthwash.  Rather than using NaF, you decide to use SnF2.  This should save money since tin fluoride is cheaper and is shown to prevent cavities in a number of studies. Calculate the mass of SnF2 (MW = 156.69 g/mol) needed to prepare 500 mL of a mouthwash with a 0.01 M fluoride ion concentration? Enter the mass needed below.

(WCSU25) Fill in the following table with the appropriate number of protons, neutrons, and electrons (enter a number only).     Protons Neutrons Electrons 48Ti+4 35Cl-

Why is naloxone considered a highly effective but short-term treatment for an opioid overdose?

Which NSAID (Non-Steroidal Anti-Inflammatory) should not be used within 72 hours of donating blood (platelets specifically)?  

While sitting in the movie theater I cannot see the screen very clearly.  What lens do I need for correction