1. How would the observed melting point compare to the true melting point of a substance if the Mel-Temp apparatus were heated too rapidly? 2. Your instructor gives you pure urea and pure cinnamic acid in separate vials, but the labels fell off? How could you use additional pure urea and a Mel-Temp ipparatus to determine which substance is in each vial? 3. Your instructor gives you an unknown sample with an observed melting point of 90C93C. Is your unknown compound A (reported Tm of 95.5C96.0C ) or compound B (reported Tm90.5C91.0C) ? Explain