Most common is ferric chloride. in reality any fast oxidizer for copper
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
The Alphunumeric keyboard
circuit
Series Circuit
Buddh international circuit.
Yeah, they are basically Birdhouse boards just less expensive. But without the perks of name branded parts.
Assuming you are talking about electrical circuits: "Cell" is the name given for a battery. Without a cell in the circuit, there is no supply of electricity. Therefore there is no electric circuit.
The chemical name for Polypropylene is poly(propene).
Common name: Electrolyte Chemical name: Sodium chloride Chemical formula: NaCl
Integrated Circuit