Sodium Borohydride Reduction of a Ketone

1. How will the dibenzalacetone product be isolated from the reaction mixture and how will it then be further purified? How will the product be characterized?

2. What apparatus and conditions (solvent, temp., reaction time, etc) will be used for the reaction?

3. Identify which is the reducing agent and which is the oxidizing agent in the reaction of benzophenone with sodium borohydride and explain your reasoning, ie. show the changes in oxidation states (best to give a drawing as per the introduction)?  

If the nuclear binding energy of an atom of Be-9 is 9.6979 x 10^-12 J/atom, calculate the atomic mass of the nuclide.

The aluminum in a 1.258-g sample of impure ammonium aluminum sulfate was precipitated with aqueous ammonia as the hydrous Al2O3 . XH2O The precipitate was filtered and ignited at 1000°C to give anhydrous Al2O3, which weighed 0.1060 g. Express the result of this analysis in terms of:

% NH4 Al(SO4)2 = %

% Al2O3= %

% Al = %

Explain the role of sodium acetate in the preparation of beta-D-glucopyranose pentaacetate. What does it do?

LP gas burns according to the exothermic reaction:
C3H8(g) + 5 O2(g) right arrow 3 CO2(g) + 4 H2O(g)    ΔHrxn° = −2044 kJ
What mass of LP gas is necessary to heat 1.8 L of water from room temperature (25.0°C) to boiling (100.0°C)? Assume that during heating, 16% of the heat emitted by the LP gas combustion goes to heat the water. The rest is lost as heat to the surroundings. (See the table.)

Combustion analysis of a compound yielded 235.50 g CO2, 72.33 g H2O, 61.57 g NO2, and 85.72 g SO2. (a) What is the empirical formula of the compound? (Assume it contains no oxygen.) chemPad Help C2H2NO Your answer appears to substitute one element for another. (b) If the molar mass of the compound is 200.34 g/mol, what is the molecular formula of the compound?

What types of compounds can be separated by HPLC but not GC? (Briefly describe properties.)

short explaination please

What detector(s) could be used to measure chloroacetaldehyde using GC? How would the detector(s) measure the separated analyte?

A gaseous fuel mixture stored at 744 mm Hg and 298 K contains only methane (CH4) and propane (C3H8). When 13.1 L of this fuel mixture is burned, it produces 858 kJ of heat. What is the mole fraction of methane in the mixture? (Assume that the water produced by the combustion is in the gaseous state.)

Question 20: B) & C)

(B) The purification protocol included application of 50mM Na,Na-buffer, pH 7.4 containing 10mM NaCl, 90mM KCL, 0.1% Tween-80, and 0.01% sodium azide. You have found following stock solutions in the lab previously prepared by a reliable lab member: a) 1M Na,Na,-phosphate buffer, pH 7.4 b) 2M NaCl c) 1M KCl d) 10% Tween 80 A small bottle of crystalline NaN3 was provided by your research supervisor. Calculate volumes (ml or µl) of each (a) through (d) stock solutions and the amount (mg or µg) of NaN3 need to be mixed together in order to prepare 250ml of required buffer.

(C) A purified protein is a metalloprotein which has a mononuclear zinc binding site. The purification procedure included several harsh conditions causing the protein to lose its metal, thus converting it into its apo-form. Calculate the amount of a 20mM ZnCl2 solution must be added to a 2ml aliquot of the protein in order to get a fully metallated form for further investigation.

(THREE PARTS) Ethyl alcohol is formed by enzyme action on sugars and starches during fermentation. The UNBALANCED equation is as follows: C6H12O6 ----> CO2 + C2H6O

A) Write the balanced chemical equation.

B) If the density of ethyl alcohol is 0.789 g/mL, how many gallons of ethanol alcohol can be produced by fermentation of 100.0 lb of sugar? C) How many gallons of ethyl alcohol was produced from the fermentation of 100.0 lbs of sugar if your homemade still only operates at a yield rate of 89.6%?

Can anyone explain ligands, complex ion and amphoteric substances that can act as an acid or base. (simply terms - high school student) It is for a lab I did of separation and identification of metal cations and I do not understand this to write a discussion part on my lab report. thank you

, Recording the time it takes (in seconds) for the temperature to drop in increments of 2ºC:

1, You will treat temperature as if it were a concentration (of heat). In order to analyze the data, you will need to know the difference between each temperature value recorded and the original room temperature. For each temperature value recorded, determine the difference between the temperature of the hot water and the room temperature. T (temperature as concentration) = TH2O - Troom Record this difference in your data table.

Please answer
In the sediments, we can find concerning substances such as: (heavy metals) & (Polycyclic aromatic hydrocarbons)
Tell how each gets into the runoff?
what are the hazards and effects associated with each, and where it will end up?

Define what is Critical Micelle conentration and association of surfactant? Using your explanation explain how chemical structures, temperature and electrolyte affect for both ionic and non ionic CMC.Please explain as clearly as possible because I am having a tomorrow !(use the interaction between the hydrophobic and the hydrophilic tail to explain also )