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Problem- Melting point alone cannot be used to unambiguously identify an unknown substance. Why not? What else do you need to confirm the identity of an unknown sample by melting point?
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The cloth shroud from around a mummy is found to have a 14C activity of 8.8 disintegrations per minute per gram of carbon as compared with living organisms that undergo 15.2 disintegrations per minute per gram of carbon.
How many milliliters of a 120 mL solution of 1.51 M BaCl2 must be used to make 16 mL of a solution that has a concentration of 0.3 M Cl-?
Which solution has highest pH? A. 15 mM formic acid (Ka = 1.77 × 10-4) B. 15 mM Acetic acid (Ka = 1.74 × 10-5) C. 15 mM MES (Ka = 7.06 × 10-7) D. 15 mM NaH2PO4 (Ka = 6.2 × 10-8) E. 15 mM Tris-hydroxymethyl aminomethane (Ka = 8.32 × 10-9)
List the following in decreasing order of strength (from strongest to weakest): hypochlorous acid, choric acid, perchloric acid, chlorous acid. Explain what trend in these oxoacids is making them progressively more acidic.
Consider the reaction of aluminum chloride (AlCl3) with sulfuric acid (H2SO4):2AlCl3(aq) + 3H2SO4(aq) ? Al2(SO4)3(aq) + 6HCl(aq) (a) 2.67 g of aluminum chloride is reacted with 1.96 g of sulfuric acid. Calculate the moles of aluminum chloride and s..
When (R)-2-bromobutane reacts with NaOCH3, the product will have what stereochemical configuration?
A sample of CH4 gas is observed to effuse through a pourous barrier in 5.08 minutes. Under the same conditions, the same number of moles of an unknown gas requires 8.63 minutes to effuse through the same barrier.
What does the anhydrous ethyl alchol do to the cinnamic acid? Why is one drop of sulfuric acid added? Why are the distillation heads packed with steel wool? Why does the reflux take an hour and why does it need to cool before the final step? Why i..
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.150 M HClO(aq) with 0.150 M KOH(aq). The ionization constant for HClO is 4.0*10^-8
A gaseous fuel mixture stored at 749 and 298 contains only methane (CH_4) and propane (C_3H_8) . When 11.3 of this fuel mixture is burned, it produces 776 of heat. What is the mole fraction of methane in the mixture
Calculate the pressure of a helium sample at -207.3°C and 768 mL if it exerts a pressure of 175 kPa at 25.0°C and 925 mL
What are the three major buffer systems of the body and what are the chemical equations
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