Key Concepts: Physical & Chemical Changes

Core Definitions

• a physical change: A change that does not alter the composition of the substance
• a chemical change: A change that produces new substances
• Is rusting a physical or chemical change: Chemical
• Is melting ice a physical or chemical change: Physical
• Is burning wood a physical or chemical change: Chemical
• Is dissolving sugar in water a physical or chemical change: Physical
• Name one sign of a chemical change.: Color change, gas production, or precipitate formation
• Is digesting food a physical or chemical change: Chemical
• Is boiling water a physical or chemical change: Physical
• Is tarnishing silver a physical or chemical change: Chemical