When CuCl2 (Copper Chloride,) a solid powder, is reacted with Aluminum (Al), a solid, in a solution, what would you expect to be left in the vial? Hint: A single replacement reaction should happen. Select one:
a. Oxygen
b. Pure Aluminum
c. Carbon Dioxide
d. Pure copper

D pure copper

Explanation:

This also is associated with the electrochemical series

AL is more reactive than copper and it will be displaced out of the solution. Leaving Copper to be left as a solid in the reaction.

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.