Most common is ferric chloride. in reality any fast oxidizer for copper
HydroFlouric Acid is used to etch glass. if that's what you're referring to. But Sand blasting is much safer.
Circuit board is the name for the place / board that parts are put on to to make a circuit. All circuit do not have to have a microchip but that board will not do anything fancy. A speaker crossover for example is the only thing I can think of. All micro chips will need a circuit board to connect power, inputs, outputs, or just to mount into a package.
Stanley cup
Complex circuit
It's basically calcium sulphate dihydrate for the common board. Firestop and water resistant boards have additives.
The Alphunumeric keyboard
circuit
Buddh international circuit.
Series Circuit
The chemical name is nitrate and the chemical formula is (NO3)-.
Yeah, they are basically Birdhouse boards just less expensive. But without the perks of name branded parts.
What is chemical name of polypropelene.