Question

17. The distance between an electron and a hole across a band gap following electronic excitation is called A. Bohr exciton radius B. Bohr radius C. quantum D. conduction band 18. When a photon strikes an atom, the energy is absorbed by A. a proton which moves to an excited state. B. a neutron which causes the nucleus to split. C. an electron which moves from the ground to an excited state. D. nothing. A photon is never absorbed by an atom. 19. Surface area to volume ratios (SA:V) are important to the functionality of nanostructures because the SA:V is than bulk materials, making these nanostructures A. Higher; more reactive C. Lower; more reactive B. Higher; inert D. Equivalent; insulators 20. Which of the following demonstrated the particle properties of light and is the basis for some automatic doors and smoke detectors? A. Heisenberg's Uncertainty principle B. quantum tunneling C. two-slit experiment D. photoelectric effect 21. In a double slit experiment, when we direct a beam of electrons at a screen, we will see an interference pattern similar to when we shine light through the screen. This illustrates the A. particle properties of light B. the wave properties of electrons C. the optical property changes at the nanoscale D. change in surface area as materials get smaller 22. Which of the following forces has a negligible impact at the nanoscale? A. gravity B. quantum effects C. Brownian motion D. van der Waals 23. Repulsive van der Waals interactions result because there can not be more than 2 electrons in an orbital. In class we explained this is why you aren't really toughing the seat you are on. This is known as the A. Heisenberg Exclusion Principle B. Pauli Exclusion Principle C. Photoelectric Effect D. Quantum Confinement 24. For most elements, the outermost electron shell is considered to be full when it contains _valence electrons. The states that atoms will form chemical bonds to achieve this number. A. 2; Coulomb's Law B. 8; Octet Rule C. 8; Orbital Law D. zero; Exclusion Principle 25. In a REDOX reaction, an electron is transferred from one atom or molecule to another. The atom/molecule which received the electron is said to be A) reduced B) oxidized C) hydrolyzed D) confined 26. Polar or charged molecules like (bond with) A) polar molecules B) hydrophobic molecules C) non-polar molecules D) lipids

Answer 1

17. D CONDUCTION BAND

18. C AN ELECTRON WHICH MOVES FROM THE GROUND TO AN EXCITED STATE

19. A HIGHER, MORE REACTIVE

20. D THE PHOTOELECTRIC EFFECT

21 B THE WAVE PROPERTIES OF ELECTRONS

22. A GRAVITY. IT IS PROPORTIONA;L TO MASS

23. B PAULI EXCLUSION PRINCIPLE: AN ORBITAL CAN CONTAIN TWO ELECTRONS WITH OPPOSITE SPINS ONLY

24. B 8 ELECTRONS IN VALENCE SHELL, KNOWN AS THE OCTET RULE

25. A REDUCED. THE ATOM THAT LOSES ELECTRON IS OXIDISED

26. A POLAR MOLECULES BECAUSE THEY CAN INTERACT