The glass transition temperature will (circle the correct answer): a. ( increase / decrease ) as the molecular weight increases. b. ( increase / decrease ) as the strength of the chain-chain bonding decreases. c. ( increase / decrease ) as the pressure increases (we did not cover this in the notes but what do you think should happen).

a) There will be an increase in the glass transition temperature when the molecular weight increases. Based on Fox-Flory equation, with the increase in molecular weight, the transition temperature of glass also increases.

b) There will be a decrease in the glass transition temperature when the strength of the chain-chain bonding decrease as intermolecular force between the bonds reduces resulting in the decrease in the glass transition temperature.

c) There will be an increase in the glass transition temperature when the pressure increases as enhancement in pressure decreases the free volume in the surroundings and enhance the bond interaction resulting in the increase in the glass transition temperature.

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.