The big idea driving this unit
Two ordinary substances get mixed together in a beaker - one time they simply combine, but another time the mixture fizzes, changes color, and gets icy cold, transforming into something entirely new. What decides whether a mixture is just a mixture, or a full-blown chemical reaction - and how do factories use that same chemistry to turn crude oil and sand into sneakers, phone cases, and windows?
Chapters in this unit
- 1 Molecular CompositionYou pour two clear, harmless-looking liquids into the same cup and the mixture suddenly turns freezing cold and starts fizzing - what could possibly be happening down at the level of atoms and molecules to cause that?
- 2 Physical and Chemical PropertiesA shiny iron nail left out in the rain slowly turns orange, flaky, and crumbly - did the iron just change shape, or did it actually turn into a completely different substance?
- 3 Conservation of MatterIf you sealed a jar, weighed it, let a dramatic chemical reaction happen completely inside, and weighed it again, would the scale move even a tiny fraction of a gram?
- 4 Synthetic vs. NaturalThe nylon straps on your backpack and the cotton in your favorite t-shirt both trace back to raw materials from nature - so why does only one of them exist because chemists rearranged its atoms inside a factory?