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How do you know if CHEMISTRY is happening? What changes let you know a Chemical Reaction has happened, vs just a Physical change? For instance, you can probably tell ice melting is a physical change - especially because you can reverse it by sticking the water into a freezer and making ice cubes. Water is still H2O, whether it’s frozen, or liquid, or even gas. But what about something more complicated, like butter? When you melt butter on the stove, at first you just get melted butter. But what about when it browns?
Do you know that browning is a special kind of chemical reaction - the MAILLARD reaction?
There are other kinds of browning, too, like the DECOMPOSITON reaction that takes place when you melt sugar to make caramel. In this video, we’ll talk about what distinguishes a chemical change from a physical change, & what are some signs to look for so you can tell the difference. To do this, first you’ll need to be able to recognize what is a physical property, vs what is a chemical property of matter. Can you name some physical properties of matter? What about some chemical properties? Here’s a hint - you won’t really observe a chemical property of matter until it is actually taking part in a reaction!
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LESSON CHAPTERS:
0:00 Intro - How do you know if a Chemical Reaction is Happening?
1:22 Recognizing Physical Properties of Matter
4:15 When a Chemical Reaction HASN'T happened
5:12 What is "browning?" Maillard reaction and decomposition
6:44 Physical Property vs Chemical Property
7:35 List of some chemical properties
8:00 Signs of a chemical reaction
8:50 POP QUIZ - CHEMICAL or PHYSICAL change?
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Uncle Tungsten: Memories of a Chemical Boyhood by Oliver Sacks https://amzn.to/3ffeRau
Napoleon's Buttons: How 17 Molecules Changed History https://amzn.to/3sIXuBW
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Written and Produced by Kimberly Hatch Harrison
About our instructor:
Kimberly Hatch Harrison received degrees in Biology and English Literature from Caltech before working in pharmaceuticals research, developing drugs for autoimmune disorders. She continued her studies in Molecular Biology (focusing on Immunology and Neurobiology) at Princeton University, where she began teaching as a graduate student. Her success in teaching convinced her to leave the glamorous world of biology research and turn to teaching full-time, accepting a position at an exclusive prep school, where she taught biology and chemistry for eight years. Kimberly co-founded Socratica Studios.
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