8. Thermochemistry
Internal Energy
8. Thermochemistry Internal Energy
24PRACTICE PROBLEM
Identify the sign of ΔU for each indicated system.
a) A gas sample is compressed adiabatically. (System = gas)
b) Hot coffee is cooled in a refrigerator. (System = coffee)
c) A worker pushes a trolley along a ramp (System = worker)
Identify the sign of ΔU for each indicated system.
a) A gas sample is compressed adiabatically. (System = gas)
b) Hot coffee is cooled in a refrigerator. (System = coffee)
c) A worker pushes a trolley along a ramp (System = worker)