Which of these physical changes would require the addition of energy (endothermic process)?
a. boiling a liquid
b. freezing a liquid
c. condensing a gas
d. deposition, gas to solid
e. none of these
Answer: A
Which of these physical changes would require the addition of energy (endothermic process)?
a. boiling a liquid
b. freezing a liquid
c. condensing a gas
d. deposition, gas to solid
e. none of these
Answer: A