Why do ice cubes float in water?
Ice is heavier than water
Ice has trapped air inside
Ice is less dense than water
Water repels ice
Why does milk curdle when left out?
Heat destroys milk proteins
Bacteria produce lactic acid
Milk reacts with air
Water evaporates
Why do we get goosebumps when cold?
Muscles contract to trap air for insulation
Hair grows faster
Skin loses water
Blood flow increases
Why do apples float in water?
Apples contain air pockets
Apples are denser than water
Apples repel water
Apples have sugar that floats
Why do we see steam above a hot cup of tea?
Water vapor condenses in cooler air
Heat generates smoke
Tea releases gas
Air heats up visibly
Why does bread become stale faster if left open?
Air dries it
Starch molecules crystallize
Yeast dies
Sugar evaporates
Why do soap bubbles have rainbow colors?
Soap changes color naturally
Light interferes in thin layers of soap
Bubbles reflect sunlight only
Soap emits light
Why does bread rise when baked?
Heat melts the flour
Yeast produces carbon dioxide
Sugar expands
Baking powder creates water
Why does water form droplets on a waxed car surface?
Water is magnetic
Surface tension minimizes contact area
Wax absorbs water
Water is repelled chemically
Why does your hair stand on end in static electricity?
Hair absorbs electricity
Like charges repel each other
Hair is magnetic
Hair reacts to air
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