Question

12. A student has a brand new pencil with a mass of 120g. One week later,
after sharpening it a few times, the pencil becomes shorter and it's mass is now
only 90g. Is this an example of a physical or chemical change?
Where is the other 30g of mass from the pencil? Be specific/give details.

Answer 1

This is a physical change because the components aren’t chemically changing, they are just being shaved off. The 30 g is in the garbage because it was physically shaved off.

Answer 2

Answer:

Water is a polar molecule because one area is ________________ and another area is ______________________.

Explanation: