intenal energy

Question 1

why do particles have potential energy

Answer 1

due to intermolecular force

Question 2

define internal energy

Answer 2

the energy stored in a system by the particles

total kinetic and potential energy

Question 3

if we heat a solid what happens

Answer 3

if we heat a solid we are increasing the internal energy so the solid will melt into a liquid

Question 4

if we heat a liquid what happens

Answer 4

when you heat a liquid you are increasing the internal energy so the liquid will boil into a gas

Question 5

if we cool a gas down what happens

Answer 5

if you cool a gas down you are reducing the internal energy so the gas will condense back into a liquid

Question 6

if we cool a liquid what happens

Answer 6

if you cool a liquid you are reducing the internal energy so the liquid will freeze into a solid

Question 7

what is the process called when a solid turns directly into a gas

Answer 7

sublimation

Question 8

when changes of state occur do you lose mass

Answer 8

no, when changes of state occur mass is conserved

Question 9

changes of state are physical changes what does this mean if you reverse the change

Answer 9

changes of state are physical changes so if you reverse the change, the material recovers its original properties

Question 10

define evaporation

Answer 10

evaporation is when a liquid turns into a gas but only on the surface of the liquid