Use the drop-down menus to classify each of these substances,
perfume
fuel
ether
alcohol
ester
carboxylic acid
anesthetic
weak base
weak acid

Explanation:

Substance abuse is related to misuse of toxic or hazardous substances for example alcohol, and illicit drugs. It leads to the psychoactive substances responsible for substance syndrome.

It is active due to global impairment in cognition, behavioral, and physiological phenomena that are developed after the repeated use of the substances abuse that is related to the strong desire to use the drugs.

precipitation

explanation:

when it goes from cloud to rain/back to earth in the form of rain

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.