Question

Classify each process as exothermic or endothermic and indicate the sign of Delta H_rxn. (a) ice melting (b) a sparkler burning (c) acetone evaporating from skin
#70

Answer 1

a) Ice melting

Is an endothermic process

Endothermic processes are those require energy to take place. In other words, system absorbs energy from surrondings. Ice can be melted by giving some energy, otherwise it will be frozen forever. del H+ for Ice melting

b) A sparkle burning

Is an exothermic process.del H- for sparkle burning

Exothermic processes are those will release energy when taking place. In other words surrondings will absorb energy from the system.

c) Acetone evaporating from skin.

Is an endothermic process. del H+ for acetone evaporating from skin.