FISMAQUIM

Consider the following statements: I - As structural species NH3 and Na+ are said isoelectronic. Given: (7 subscript)N, (1subscript)H, (11 subscript)Na. II - The formation of the cathode rays is due to the process of ionization of the residual gas inside the ampoule. III - In the atomic model of Thomson, matter is neutral by a simple fact of finding the electrons in a positive noodle in a region called the electrosphere. Which one (s) of the statement (s) are (are) correct? Justify correcting the wrong alternatives.

Consider 2 electronic transitions below: 1) Electron 1s jump for 2s 2) Electron 1s jumps to 2p By calling I, II and III the set of the two electronic transitions mentioned above for the atoms of (1 subscript)H, (3 subscript)Li, (4 subscript)Be, respectively, we can state that: a) In I, the two transitions absorb the same energy. b) In II, the two transitions absorb the same energy. c) In III, the two transitions absorb the same energy. d) The second transition in II absorbs the same energy as the 2nd transition in III. e) The second transition in II absorbs more energy than the 2nd transition in III.

Assume a hydrogen atom in the ground state. Observe the energy diagram of the electronic levels for the hydrogen atom and judge the following items: I. The atom can absorb any form of energy, but not any amount of energy. II. If an electron receiving energy goes into an excited state, returning to its ground state can release any form of energy. III. The atom can absorb a photon of 10.2 eV, but can not absorb a photon with 11 eV. IV. An electron with an energy of 11 eV can, after collision with the atom in question, transfer part of its energy by exciting the hydrogen atom. V. An electron with energy of 10 eV can, after collision with the atom in question, transfer part of its energy by exciting the hydrogen atom SAW. Atom in the ground state is the same as the neutral atom. VII. The photon emitted by hydrogen when its electron returns from level 3 to level 2 has wavelength greater than the photon emitted in the return from level 4 to level 2. VIII. The ionization energy of hydrogen is 13.6 eV? (show) IX. By supplying 13.65 eV to the hydrogen atom in the ground state, thereafter the electron of the same has discontinuous energy. Consider 2 electronic transitions below: 1) Electron 1s jump for 2s 2) Electron 1s jumps to 2p By calling I, II and III the set of the two electronic transitions mentioned above for the atoms of (1 subscript)H, (3 subscript)Li, (4 subscript)Be, respectively, we can state that: a) In I, the two transitions absorb the same energy. b) In II, the two transitions absorb the same energy. c) In III, the two transitions absorb the same energy. d) The second transition in II absorbs the same energy as the 2nd transition in III. e) The second transition in II absorbs more energy than the 2nd transition in III.

In 1996, the Nobel Prize in Chemistry was awarded to scientists who discovered a molecule in the form of a soccer ball, called fullerene (C60). Besides this substance, graphite and diamond are also made of carbon. The densities of these substances, not necessarily in the order presented, are: 3,5; 1,7 and 2,3 g/cm³. Based on the average distances between carbon atoms, choose the appropriate density and calculate the mass, in grams, of a sphere of 2 cm diameter fullerene. Data: Mean distance between carbon atoms in nanometers (10^9 m) diamond ...................... 0,178 fullerene .................... 0,226 graphite ..................... 0,207 Sphere Volume V = (4πr³) / 3