Baking a cake
Decorating a cake
Milk souring
sanding a piece of wood
crushing an aluminum can
aluminum combining with oxygen to form aluminum oxide
water freezing and forming ice
frying an egg
burning wood
leaves turning colors in the fall
dry ice subliming into a gas
methane gas bubbles lighting on fire
Cutting your hair
Bleaching your hair
Painting a homecoming picture on the window
Alka-Seltzer fizzing in water
Water boiling at 100 degrees Celsius
Ethane combusting with oxygen to form carbon dioxide gas and water.
Melting Gallium at 37 degrees Celsius
Hexnuts rusting when left in a cartesian diver bottle (with water still in it)
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