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An electron in a hydrogen atom relaxes to the n = 1 level, emitting light with a wavelength of 93.72 nm. What is the value of n for the level in which the electron originated? You must use the following constants for your calculation: h = 6.626×10-34 J s c = 2.9979×108 m/s En = -2.18×10-18/n2 J You may use following equation: Ephoton = 2.18×10-18 (1/n12 – 1/n22) J,  (n1 < n2) Mark your answer next to words "Final answer is". You must follow significant figure rules.   You must show your work here to receive any credit (you may receive 0 points for only showing your final answer).

Two samples of a compound containing elements A and B were decomposed. The first sample produced 15 g of A and 35 g of B.  The second sample produced 35 g of A and what mass of B?

Choisissez la meilleure réponse parmi les choix proposés. ___________________________ aident beaucoup l’environnement en posant des petits gestes ou en organisant des événements.

Which documentation measures should be taken for anesthesia and pain control?

Which electron in S is least shielded from nuclear charge?

Give the ground state electron configuration for Se.    

An electron in a hydrogen atom relaxes to the n = 1 level, emitting light with a wavelength of 102.5 nm. What is the value of n for the level in which the electron originated? You must use the following constants for your calculation: h = 6.626×10-34 J s c = 2.9979×108 m/s En = -2.18×10-18/n2 J You may use following equation: Ephoton = 2.18×10-18 (1/n12 – 1/n22) J,  (n1 < n2)   Mark your answer next to words "Final answer is". You must follow significant figure rules.   You must show your work here to receive any credit (you may receive 0 points for only showing your final answer).

Which reaction below represents the first ionization of O atom (IE1)?

Which sample contains the smallest number of atoms?

Anesthetic cartridges should be stored: