Which of the following statements correctly describes the melting process?

it is exothermic because heat is gained from the surroundings.

it is endothermic because heat is lost to the surroundings.

it is exothermic because heat is lost to the surroundings.

it is endothermic because heat is gained from the surroundings.

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.