Elements can be identified based on their emission spectrum because each element: emits a characteristic set of discrete wavelengths, according to its electronic energy levels emits a characteristic set of discrete wavelengths, depending on the amount of energy applied has its own inherent, identifiable color to start with has the same basic pattern of spectral lines with few exceptions

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

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11) burning your hand when accidentally touching a hot plate is an example of which heat transfer? a. conduction b. convection c. radiation d. none of these