Which of the following transformations represent an increase in the entropy of the system. Choose all that apply 32 g Ag (liquid, 1.234×103K)32 g Ag (solid, 1.234×103K) 4 mol CH4 (6.48 L, 215K)4 mol CH4 (13.0 L, 215K) 21 g C5H12 (liquid, 309K)21 g C5H12 (gas, 309K) 3 mol CH4 (1.11 atm, 414K)3 mol CH4 (1.11 atm, 207K) 21 g C5H12 (liquid, 159K)21 g C5H12 (liquid, 294K)

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н, о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?