Which sentence describes an example of sublimation?
a. dew forms on leaves on a cold morning.
b. liquid deodorant sprayed on a person’s body evaporates.
c. dry ice changes to carbon dioxide when kept in an open container.
d. ice cream in a bowl melts.
e. water vapor condenses on a cold surface and forms droplets.

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion