Which of the items adopts neither the shape nor the volume of its container? helium in a balloon
soda in a bottle
coin in a bag

Coin in a bag

Explanation:

Hello,

In this case, based on the molecular arrangement of gases, liquids and solids, we notice that both gases and liquids must take the shape of the container wherein they are as their molecules are not strongly attracted unlike solids, which have stronger intramolecular forces allowing them to be held together. For that reason, both helium and soda take the shape and the volume of the balloon and the bottle respectively whereas the coin in the bag does not.

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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.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.