when an exothermic reaction releases thermal energy, this energy is

select all that apply.

a: useful to do work
b: not useable to do work
c: harnessed to do work
d: dissipated by conduction

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this

Acold glass is left sitting outside on a hot day. soon, water droplets form on the outside of the glass. describe the events that must occur for the water droplets to form on the glass.