Which statement best describes the properties of covalent compounds?
1. they are always solid at room temperature, are brittle, and have a high melting point.
2. they may be gases, liquids, or solids at room temperature, and have a low melting and boiling point.
3. they are always composed of an equal proportion of cations to anions.
4. they are always liquid at room temperature, and have a high melting and boiling point.
5. they are good conductors of heat and electricity, and are ductile and malleable.

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.

the right answer is c i just did the question.