(b) In figure Q1(a) a system is taken from state A to state B along the path ACB, 95 J of heat flows into the system and the system does 38 J of work. (1) How much heat flows into the system along the path ADB if the work is done is -15J? (ii) When the system returned from state B to A along the curved path, the work done on the system is 25 J. Does the system absorb or liberate heat, and how much? (ii) If Up - UA = 50J, find the heat absorbed in the process AD and DB. D. Figure Q2(b)

Kayla began a science experiment with 18 grams of an unknown solid. During the experiment, the change in the mass of the solid was -7 grams. What was the mass of the solid at the end of the experiment? To solve the problem, Edna subtracted 18 - (-7) and came up with an answer of 25 grams. Is Edna correct? Why or why not?

What are the answers to #8 and #9?

1.5 A. Draw the repeat units for polyethylene, polypropylene and Nylon 6,6. Identify any dipoles present in these structures. B. How many total carbon atoms are in the (i) backbone and (ii) side (pendant) groups of: (a) polyethylene, PE, with 400 repeat units? (b) polypropylene, PP, with 400 repeat units? (c) a linear polypropylene homopolymer with a molecular weight of 525,000? (d) Nylon 6,6 with 400 repeat units? (e) a random copolymer made from a 50/50 weight ratio of ethylene and propylene, with a molecular weight of 525,000? Hint: You'll need to consider monomer molecular weights to solve part (e)

How many Oxygen atoms would be produced from 18.75g Al(NO3)3? digit_______  (format of answer: 1.23x10^23) unit  ________   Blank 1:  Blank 2:

in packed towers experiment, The Ergun equation is a fine starting point for typical use in helping size/design columns in a variety of applications, however it makes numerous assumptions and approximations in its derivation.  Can you name and explain (why) 2 regimes of operation where you clearly think the Ergun equation (at least the one we use in this class) would not be appropriate to use in column design?