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DePaul HON 225 - Quiz 1 key

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HON 225 September 17, 2014 Please print Quiz #1: 50 pts 1. (4 pts each) Write each answer to the proper number of significant figures (room for work is provided, if needed). a. 7.5 x 493 3.7 x 103 Express this answer using scientific notation b. (0.7743 x 6.14) + 0.013 4.77 2. (5 pts each) Show your work for each of the following and express to the correct number of significant figures: a. Calculate 55 miles/hour in units of km/s. (1 mile = 1.6 km) (55 mi/hr) (1.6 km/1 mi) (1 hr/3600 s) = 0.024 km/s b. An average atom has a diameter of 0.200 nm. How large is this in inches (in)? (109 nm = 1 m; 2.54 cm = 1 in, 1 m = 100 cm). Express the answer using scientific notation and with the correct number of significant figures. (0.200 nm) (1 m/109 nm) (100 cm/1 m) (1 in/2.54 cm) = 7.87 x 10–9 in 3. (4 pts) A number of people become ill after eating dinner in a restaurant. Which of the following statements is a scientific hypothesis (circle the correct response)? a. The cooks felt really bad about it. b. Bacteria in the oysters may have caused the illness. c. Symptoms include nausea and dizziness d. Everyone who ate oysters got sick. e. People got sick whether the oysters were raw or cooked. 4. (5 pts) Put a number next to each step in the scientific method in the order in which you should complete it: 5 Make a conclusion/perform additional experiments to test your results 1 Pick your topic/ask a question about nature 3 Conduct your experiment and obtain results 2 Make your hypothesis 4 Analyze your results5. (3 pts each) Consult the periodic table attached to this exam and write the nuclide symbol for the most common (abundant) isotope of the following elements: a. aluminum b. potassium 6. (3 pts each) Answer the following true or false questions. Please print clearly. a. F Thompson's "fruitcake" model of the atom is still used today. b. T There are >100 known elements. 7. (11 pts) State the three observations made by Rutherford in the experiment he used to probe the structure of the atom using alpha particles. What did each observation reveal about the nature of the atom? Write the nuclide symbol for an alpha particle. 1) Most alpha particles passed through Au foil. So atoms are mostly empty space. 2) A few alpha particles were deflected slightly. Alpha particles deflected by charged object within the empty space of the atom, i.e., electrons are found within the empty space of the atom. 3) An occasional alpha particle was deflected severely. Alpha particle was hitting a very hard (massive) but extremely tiny object, the source of most of the mass of atom. I.e., the nucleus is tiny and contains most of the mass. Nuclide symbol: 4He. Will also accept 4He2+

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