Activity (continued from previous page) 3. Define: A phase change is a change from one state to another, such as from a liquid to a
gas. Based on what you have read in the Gizmo, fill in the blanks with the words "liquid."
"gas," or "solid" to define each change.
Evaporation:
Change from a
to a
to a
Condensation:
Change from a
to a
Change from a
Melting:
to a
Change from a
Freezing:
4. Practice: Fill in the process that causes each transition. Your choices are evaporation,
indensation, precipitation, melting, and freezing.

your answer is c) plasma

~*"auba14"*~

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole

the answer is c i took the test