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Quantum
Quantum Mechanics
Quasar
Quark
Jasmin is right, also Quasar
1) Quark: A sub atomic particle.
2) Quenching: The process rapid cooling to obtain certian material properities. (For instance, low crystallinity and thereby higher toughness.)
3) Quinoline: A famous heterocyclic aromatic organic compound whose derivatives has a wide range of applications.
The word quantum is a 'q' word, and you can find it in lots of places in chemistry and physics. Both sciences have a heavy dependence on quantum mechanics.
