Question

An engineer pours hot, liquid metal into a mold. As it cools, it takes the form of a solid beam.

In the process described above, what is the evidence that a physical change occurred?


I. The liquid metal cooled to form a solid.

II. The shape of the metal changed.

III. The metal changed into new substances.

A.

I and II only

B.

III only

C.

II only

Answer 1

The answer is A because a physical change to a substance is when a substance has changed that change to a substance can be undone or is not permeant.

Answer 2

Evidence of a physical change occurred in the process of pouring hot, liquid metal into a mold, as indicated by: A. I and II only

I. The liquid metal cooled to form a solid.

II. The shape of the metal changed.

What happens in the liquid

These factors denote physical alterations without the formation of new substances, distinguishing it as a physical change.

In the given scenario, the evidence supporting a physical change lies in the transformation of the liquid metal into a solid state due to cooling (I). This change involves a shift in the metal's state from a fluid to a solid form without altering its chemical composition.