Homework 1-problems - kramer (jrk2286) Homework 1 sutcliffe...

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Unformatted text preview: kramer (jrk2286) Homework 1 sutcliffe (90830) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Which of the following describes a chemical change? 1. gasoline burns in an engine 2. alcohol evaporates 3. water is heated from 0 C to 50 C 4. wood is carved 002 10.0 points What is the volume of a sample of helium that has a mass of 2 . 5 10- 3 g, and a density of . 17847 g / L? Answer in units of mL. 003 10.0 points What is the nuclear composition of an atom of iodine-131? 1. 131 protons 2. 53 protons, 53 electrons 3. 78 protons, 53 neutrons 4. 53 protons, 78 neutrons 004 10.0 points How many hydrogen atoms appear in the for- mula of ammonium sulfate? 1. 6 atoms 2. 2 atoms 3. 4 atoms 4. 10 atoms 5. 8 atoms 005 10.0 points Choose the pair of names and formulae that do not match. 1. SCl 4 : sulfur tetrachloride 2. SnCl 4 : tin(V) chloride 3. MgSO 4 : magnesium sulfate 4. N 2 O 3 : dinitrogen trioxide 5. KNO 3 : potassium nitrate 006 10.0 points Which of the following is the molecular for- mula for heptane? 1. C 7 H 16 2. C 6 H 14 3. C 7 H 14 4. C 7 H 12 5. C 6 H 12 007 10.0 points Calculate the energy of a photon of light with a wavelength of 0.57 km. 1. 3 . 5 10- 25 J 2. 3 . 5 10- 23 J 3. 3 . 8 10- 31 J 4. 5 . 3 10 8 J 5. 3 . 5 10- 22 J 6. 5 . 3 10 11 J 7. 3 . 8 10- 34 J 8. 3 . 5 10- 28 J 9. 530000 J kramer (jrk2286) Homework 1 sutcliffe (90830) 2 008 10.0 points We conduct an experiment by shining 500 nm light on potassium metal. This causes electrons to be emitted from the surface via the photoelectric effect. Now we change our source light to 450 nm at the same intensity level. Which of the following is the result fromlevel....
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Homework 1-problems - kramer (jrk2286) Homework 1 sutcliffe...

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