An animal cell contains a nucleus and other organelles suspended in a watery solution that is encased in a flexible cell membrane. Which of the following physical models would best represent an animal cell? A.
A plastic zipper bag filled with water, one large plastic bead, and many smaller beads.
B.
A metal box filled with foam balls that are painted different colors.
C.
A basket filled with a soccer ball and surrounded by ping pong balls.
D.
A glass jar filled with water, a large marble, and many different types of coins.

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.

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b

answer: mole of the gas

answer: mole of the gasexplanation: