Chemical Changes: Crash Course Kids #19.2 [ EASY × 2026 ]

Like a silver spoon turning black (tarnish) or a green leaf turning orange in the fall.

How can you tell if a reaction is happening? Look for these "clues":

Iron reacting with oxygen and water to create iron oxide. Burning: Wood turning into ash, smoke, and heat.

Enzymes in your stomach breaking down food into nutrients.

The mixture suddenly gets very hot or very cold without you touching a stove or freezer.

Two liquids are mixed together and a solid "chunk" suddenly appears. ⚡️ Common Examples

A new smell is created (like food rotting or a match striking).