Jenny goes to the beach and uses sand to make a sand castle. Which of the following is/are true about the change in the shape of the sand?

Question

I. It is a physical change.
II. It makes a new substance.
III. It is a chemical change.

A.
I and II only
B.
II only
C.
I only
D.
II and III only

Answer 1

The correct answer is C. I only.

Here's the reasoning:

• I. It is a physical change. This statement is true. When Jenny makes a sand castle, she is changing the shape and arrangement of the sand, but the sand itself remains the same substance (silica).

• II. It makes a new substance. This statement is false. The process of making a sandcastle does not create a new substance; the sand retains its chemical identity.

• III. It is a chemical change. This statement is false. A chemical change involves a transformation that alters the chemical composition of a substance. Since the sand's chemical identity remains unchanged, it is not a chemical change.

Therefore, only statement I is true.