In which case is more heat involved: mixing 100.0g of 90 degree celsius water and 80 degree celsius water or mixing 100g samples of 60 degree celsius water and 10 degree celsius water? assume no heat is lost to the environment.

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas