plz help.. Which of the following phase changes is an endothermic change?

Question

anonymous · Answer

A. condensation 	
  B. vaporization 	
  C. deposition 	
  D. freezing 

I know the 3 stages of it.. but im confused by this question, anyone care to explain?

anonymous · Answer

B is endothermic

anonymous · Answer

It is because its gaining heat.

anonymous · Answer

ahhh ok. Thank you!!!!! I have another question The phase change in which a substance changes from a gas directly to a solid is
  A. condensation. 	
  B. vaporization. 	
  C. deposition. 	
  D. sublimation.


Would this be C, Deposition?

anonymous · Answer

No this would be D. Sublimation.  Deposition is Solid to Gas.

anonymous · Answer

I feel dumb now.. thank you again.. hah, this is all confusing!!!

anonymous · Answer

If you need help just message me i just went over this stuff last Semester.

anonymous · Answer

Thank you!!! :)

anonymous · Answer

Collisions of helium atoms with the walls of a closed container cause
  A. condensation. 	
  B. gas pressure. 	
  C. a decrease in volume. 	
  D. an overall loss of energy.  


The answer would be B , gas pressure?

anonymous · Answer

I think so, when they are colliding, we know that they will produce something:pressure

anonymous · Answer

does that make sense?

anonymous · Answer

It does. thanks !!!

anonymous · Answer

It is gas pressure

anonymous · Answer

your welcome!