In which substance are molecules rigidly arranged? a: the water in a freezer at -2c
b: the water in a cup at 22c (room temp)
c: the water in a pot at 100c
d: the water in a steam engine at 110c

a: the water in a freezer at -2c

Explanation:

The molecular in freeze water is more compact than room temperature water or boiling water, therefore, it would be harder to separate the molecules which makes it more rigid.

The water in a freezer at a -2 °

Explanation:

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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.