Liquid water is fed to a boiler at 24 c and 10 bar and is converted at constant pressure to saturated steam. calculate the heat input required to 3 produce 15,000 m /h of steam at the exiting conditions. assume that the kinetic energy of the entering liquid is negligible and that the steam is discharged through a 15-cm id pipe. (from steam tables: h (h, o) 24 с, 10 bar) kj/kg v (steam, 10 bar, saturated) = 0.1943 m /kg)) 100.6 kj/kg; h (steam, 10 bar, saturated) 2776.2 _ 3

Which of the following might a chemist choose to study? a. glacier movement in alaska b. better ways to recycle plastics c. the effects of hurricanes on turtle populations d. the vibrations in bridges caused by big trucks

Dying the folding patterns of protein molecules can microbiologists better understand cellular processes as well as some diseases, such as alzheimer’s, that are caused by proteins that have misfolded. the folding of these complicated molecules can be simulated on computers, but it takes a lot of processor power and time for even expensive supercomputers to do this. a group of researchers at stanford university developed software that can be used to distribute the processing of data to anyone who is willing to donate time on their idle personal computers. as a result, the researchers have been able to achieve protein-folding simulations that are far better than those other computing methods have done. which statement best describes the work of these researchers? the work is not scientific because the data are not processed in one location. the work is not scientific because the simulations are not reproducible. the researchers applied creativity to solve a problem in running an experiment. the researchers used only well-established scientific techniques.

Which of the following describes qualitative data? a) recording the temperature of a solid as it is warmed. b) noting the color of a solution as it is heated. c) measuring the volume of an object by water displacement. d) taking the mass of an object using a balance.