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A periodic wave has a frequency of 7.4 Hz. What is the wave period? How many numbers of lone pairs of electrons around the centeral atom does SO2 have? What nocturnal insect maks a low but high pitched call ascending in frequency? Initially 0.50 mol of H2H and 0.50 mol Cl2O are placed in a 1.0 L container. Calculate the [HOCl] at equilibrium? Is Minkowkis space time considered real if time is imaginary and a point in space is just a location point?