Unit 1 Practice Exam 1 PDF

CH301 NAME: ______________________________________________ Unit 1 Practice Exam 1 1. Atom Structure Which of the following statements about atomic structure is NOT true? a) Most of the volume of an atom is empty spac...

CH301 NAME: ______________________________________________ Unit 1 Practice Exam 1 1. Atom Structure Which of the following statements about atomic structure is NOT true? a) Most of the volume of an atom is empty space. b) Electrons are the fundamental particle with a negative charge. c) The number of protons and neutrons in an atom must be equal. d) Protons are about 2000 times larger than electrons. 2. Question Functional Relationships Which of the following statements about functional relationship is NOT true? a) Plotting (1,2), (2,4), (3,6) is an inverse function. b) Plotting (1,1), (2,4), (3,9) is a parabolic function. c) Plotting (1,2), (2,4), (3,8), (4,16) is an exponential function. d) Plotting (1,1), (2,0.25), (3,0.11) is an inverse square function. 3. Scientific Notation Math What is [(8 x 10-5)(3 x 109)]/(4 x 10-5)? a) 6 x 109 b) 6 x 10-1 c) 9.6 x 1010 d) 6.6 x 109 4. Approximations The atomic weights of the halogens are listed below. If you rounded to the nearest integer to perform a calculation of molar mass, which would have the largest error? a) F: 19.0 g/mol b) Cl: 35.45 g/mol c) Br: 79.9 g/mol d) I: 126.9 g/mol CH301 | 1  CH301 NAME: ______________________________________________ 5. Add 1 Question mKs units There are 2.2 pounds in a kilogram and 16 ounces in a pound. Express 22 pounds in mks units. a) 22 pounds b) 160 ounces c) 10 kg d) 48 kg 6. EMR Ranking and Calculations What is the correct order of increasing energy? e) Microwaves, visible light, ultraviolet light, x-rays, g-rays f) Microwaves, x-rays, g-rays, visible light, ultraviolet light g) Microwaves, ultraviolet light, visible light, x-rays, g-rays h) X-rays, g-rays, microwaves, visible light, ultraviolet light 7. EMR Ranking and Calculations If a photon’s wavelength is 663 nm, what is its energy? a) 4.40 x 10-37 J b) 3.00 x 10-22 J c) 4.40 x 10-40 J d) 3.00 x 10-19 J 8. Interactions between light and matter When a given molecule absorbs a photon of infrared (IR) radiation a) It promotes electrons intro delocalized bonding orbitals. b) It begins to vibrate. c) It begins to rotate. d) Its electrons are excited to higher energy levels. 9. Interactions between light and matter Radiofrequency radiation has what kind of impact on matter? a) It makes the nuclei spin b) It makes the electrons spin c) It makes the molecule rotate d) It makes the nucleus split CH301 | 2  CH301 NAME: ______________________________________________ 10. Failure of Classical Mechanics (Photoelectric effect) Given what you know about the photoelectric effect, what occurs when 10 photons of 3 eV light strike a metal surface that has a 6 eV work function? a) Nothing happens b) 10 electrons are ejected from the metal c) 5 electrons are ejected from the metal d) 10 6-eV photons are ejected from the metal 11. Wave particle duality of Light and Matter The famous electron diffraction pattern is proof of what concept? a) Particles can exhibit wave-like properties b) The location and trajectory of electrons can be found c) Electromagnetic radiation can exhibit wave-like properties d) Electrons can spin when hit by microwave radiation 12. De Broglie theory According to deBroglie, which of the following object has the smallest wavelength? a) electrons b) neutrons c) protons d) molecules 13. Rydberg equation calculation For a Bohr atom, which of the following transitions emits the highest energy photon? a) From n = 10 to n = 8 b) From n = 4 to n = 3 c) From n = 6 to n = 5 d) From n = 2 to n = 1 CH301 | 3  CH301 NAME: ______________________________________________ 14. Rydberg equation calculation Which of the following emission lines corresponds to part of the Balmer series of lines in the spectrum of a hydrogen atom? I) n = 2 à n = 1 II) n = 4 à n = 2 III) n = 4 à n = 1 IV) n = 3 à n = 2 V) n = 4 à n = 3 a) II and III only b) II and IV only c) V only d) I and III only 15. Quantum number applications – H atom The angular momentum quantum number provides us with information about which characteristic of an electron bound in an atom? a) Orbital energy b) Electron mass c) Orbital shape d) Electron spin 16. Quantum Numbers Boundary Conditions Which set of quantum numbers does NOT provide a satisfactory solution to the wave equation? a) n = 4, l = -3, ml = -3 b) n = 4, l = 3, ml = 0 c) n = 4, l = 3, ml = -1 d) n = 4, l = 2, ml = -1 17. Quantum Numbers Boundary Conditions What is the maximum number of electrons that can occupy the n = 1 and n = 2 shells with a spin of +1/2? a) 10 b) 5 c) 8 d) 4 CH301 | 4  CH301 NAME: ______________________________________________ 18. Quantum numbers and periodic table How many blocks are found in the periodic table and how many of these blocks make up the main group elements? a) 4 blocks are found in the periodic table and 2 blocks make up the main group elements b) 4 blocks are found in the periodic table and 1 block makes up the main group elements c) 3 blocks are found in the periodic table and 2 blocks make up the main group elements d) 4 blocks are found in the periodic table and all 4 blocks make up the main group elements 19. Aufbau, Hund, and Pauli Hund’s rule states that a) When orbitals in a subshell have the same energy, all of them must be filled with an electron before pairing of electrons begins. b) It is impossible to determine accurately both the momentum and position of an electron simultaneously. c) No two electrons in an atom may have identical sets of four quantum numbers. d) None of the above. 20. Aufbau, Hund, and Pauli According to Pauli, which of the following electron configurations is not possible? a) 1s32s2 b) 1s22s2 c) 1s12s2 d) 1s22s1 CH301 | 5