Which statement best describes the difference between a physical change and a chemical change? question 3 options: a physical change is a change from one state of matter to another; a chemical change results in a new substance formed. a physical change produces a new element, and a chemical change results in a bond breaking between atoms. a chemical change results in a new element being formed, and a physical change results in a new compound being formed. a chemical change does not result in a new substance being formed, whereas a physical change does.

Steam is generated in a boiler of a cogeneration plant at 10 mpa and 450°c at a steady rate of 5 kg/s. in normal operation, steam expands in a turbine to a pressure of 0.5 mpa and is then routed to the process heater, where it supplies the process heat. steam leaves the process heater as a saturated liquid and is pumped to the boiler pressure. in this mode, no steam passes through a condenser, which operates at 20 kpa. (a) determine the power produced in the turbine and the rate at which process heat is supplied in this mode. (b) determine the power produced in the turbine and the rate of process heat supplied if only 60 percent of the steam is routed to the process heater and the remainder is expanded to the condenser pressure. (3.32 mw; 9.69 mw; 4.25 mw; 5.82 mw)

How many atoms of nitrogen are in the chemical formula ni(w on

You can decrease the resistance of a length of wire by