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Organic Chemistry Melting Point questions
1) For what reason(s) would someone be interested in determining the melting point (mp) range of a compound?
2) What would be the effect of an insoluble (immiscible) impurity (e.g., sand or charcoal) on the mp range of an otherwise pure compound?
3) Three vials, labelled A, B & C, contain substances with nearly identical mp ranges. What specific experimental steps could you take to prove that the contents of A, B and C were different substances, and what observations would lead you to that conclusion?
4) Too rapid heating of a sample during mp range determination causes an inaccurate observed mp range. Exactly how would the observed range compare with the true mp range if you made this error, and explain why this would be so.
What is the Lewis structure of the covalent compound that contains one nitrogen atom, one hydrogen atom, and one carbon atom? Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons.
Why might this fire rekindle days later as someone tries to remove the residue with water? What chemical process is involved here?
How to synthesize benzyl-diisopropylamine. List the starting materials, solvent, reagent, and products formed, Write a mechanism for this reaction
mass of solvent134.4 gmolthe same mass of solute is dissolved in 9.82 g of t-butanol instead of cyclohexane. what is
Sketch a phase diagram for benzene and locate these points: the triple point (5.5 0C and 3.4 mmHg), the normal boiling point (80.10C)
The molar heat capacity of silver is 25.35 J/mol (degrees C). How much energy would it take to raise the temperature of 11.8g of silver by 16.2 degrees C
Problem- Use the henderson-hasselbalch equation to calculate the pH of a buffer containing .250 M sodium propionate and 0.350 M propionic acid. The Ka of propionic acid is 1.34 *10^-5.
25mL of a .10M solution of the weak acid hydrofluoric acid, HF, is titrsted with .10M solution of the weak base amonia, NH3. Will the pH at the equivilance point be less than 7 equal to 7 or greater than 7? Explain. Ka for HF is 7.2e-4 and Kb for ..
A solution is prepared by mixing 79.0 mL of 5.00 M HCl and 34.0 mL of 8.00 M HNO3. Water is then added until the final volume is 1.00 L. Calculate [H+ ], [OH - ], and the pH for this solution.
How many L of H2 gas (at STP) is produced from 470 mL of 0.36 M HCl and excess Zn? The reaction is: Zn + 2HCl = ZnCl2 + H2
Write the net redox reaction that occurs in the galvanic cell. (1 pt) Zn(s) | Zn2+(aq) (1.00 M) || Pb2+(aq) (1.00 M)| Pb(s)
Electrolytes and Molarity, Iii)salt is added to 81.4 g of water? iv) Identify the electrolytes and the non-electrolytes among the following compounds
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