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. Carbon Dioxide
b. Oxygen
c. Pure copper
d. Pure Aluminum

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.