Question

John Smith is a chemistry student who lives in Florida and the mosquitoes are horrible this year. He is sweating…thinking…why don’t I live in Colorado, I would be much cooler. He is thinking about phase changes, intermolecular forces and the many natural phenomena that occur around him every day.

a) He has a glass of cold lemonade with ice in it and he notices that his glass is also sweating. What phase change was occurring when sweat was forming on the outside of his glass and why(how) was it happening?

What about the ice in his drink. It was definitely melting. How much energy does it take to convert ice to steam anyway, which is essentially what he was doing by drinking, then sweating

Calculate the energy required to convert John’s 10g ice cube, which began at -3^oC, to water vapor at 100^oC. Show all your work.

Note:ice began at -3 degrees celcius shown above

Answer 1

phase is occurring from gas to liquid out side of the glass. since heat is transferring from gas to the cold liquid inside the glass. After loosing heat gas outside of the glass turn to liquid and stick to the glass like sweat. since there is temperature difference between the liquid and ice , heat is transferring from ice to liquid making the liquid cold .so ice is melting as it is loosing heat.