16. Higher order thinking questions I

1. Peeled and unpeeled banana does not look the same. Does that mean peeling banana is
a chemical change?

 

2. A very hot glass on putting in cold water cracks. What does this change indicate?

 

When hot glass is quickly cooled, the glass cools unevenly, causing the glass to crack because the inside contracts while the outside expands. Glass contractsexpands when hot and expandscontracts when cold. It’s a physical but irreversible change.