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Leader: Course: Instructor: Date: Worksheet 2, ch 2 Supplemental Instruction Iowa State University Matt HermsenWhite Chem 177 Dr Irmi Schewe-Miller 1-19-17 1. State the Law of Conservation of Mass 2. Which of the following is not part of Daltons Atomic Theory of Matter? a. atoms cannot be changed to other elements by chemical reactions b. atoms of the same element are identical to one another c. elements are composed of atoms d. multiple atoms of the same element can combine to form other elements 3. Complete the following Location in Atom Charge Mass (amu) Proton Neutron Electron 4. How many protons, neutrons, and electrons are in the following atoms? a. 12 e. 16 C O b. 14 f. 238 C U c. 119 g. 56 Sn Fe d. 40 h. 27 Ca Al 5. What happens to an atom if you change the following components? a. proton: b. neutron: c. electron: 1060 Hixson-Lied Student Success Center 515-294-6624 [email protected] http://www.si.iastate.edu 6. Which of the following are isotopes of each other? a. 12 b. 24 c. 27 12 B Mg 22 Al C Mg 28 Si 12 26 N Mg 29 P 7. Calculate the average atomic mass for Mg using the following data Isotope % Abundance Atomic Mass (amu) 24Mg 78.99 23.98504 25Mg 10.00 24.98584 26Mg 11.01 25.98259 8. The radius of a gold atom is 1.35 Å. a. Express this distance in micro meters. b. How many gold atoms would it take to span the length of one gold bar? (1 gold bar = 10.25 cm long) 9. In an experiment, a scientist prepared 3 different compounds containing only iodine and fluorine. Calculate the mass of iodine per fluorine in each compound. Compound Mass Iodine (g) Mass Fluorine (g) A 4.75 3.56 B 7.64 3.43 C 9.41 9.86 Which chemical Law is shown by this data?