Definition: The univalent radical CH2=CH−, derived from ethylene.

Alright class, settle down now, let’s dive in with a bow! Today we’re tackling “vinyl,” a word that might seem a bit grand, But it's simpler than you think, if you understand the plan. The dictionary gives us a mouthful, quite precise and neat, “Univalent radical CH2=CH−, derived from ethylene” – a scientific treat! Let’s break it down with a little rhyme, to make it clear and bright: Vinyl is the name, it's short and true, A tiny piece of stuff, for me and you. Now, let's unpack those words, one by one, if you please: Univalent: That means “one” – just a single little guy, Attached to something else, beneath the sky! It’s not part of a pair, you see. Radical: Think of it as a starting point, you'll agree, A building block of chemicals, for all chemistry! CH2=CH−: This is where the real magic lies, It’s a chemical formula – don’t be surprised! Let's decode with glee: C stands for Carbon, bright and bold, A key component, stories to be told. H2 means two hydrogens, light and free, Attached to the carbon, you agree? =CH shows a double bond – a connection strong and true, Sharing electrons, shining anew! Ethylene: This is where vinyl comes from, it's plain to see, A simple hydrocarbon, happy and free! So, “vinyl” is essentially a piece of ethylene that’s been split apart, Just one little fragment – a crucial chemical part. It’s used in plastics, ropes and more, you understand? A versatile compound, across the land! Any questions? Don't be shy, let your curiosity fly! Do you want me to explain how vinyl is made or what it’s used for?