Unit 2 Review Sheet KEY

Unit 2 Review Sheet KEY - What makes isotopes of an element...

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Name: __________________________________________ Date: ____________ WKST #7: Unit 2 Review Sheet (20 points) Period: __________ 1. Complete the chart below: Symbol Protons Neutrons Electrons Sr-89 38 51 38 47 Ti 4+ 22 25 18 N 3+ 7 7 4 Si 4- 14 14 18 Pt-195 78 117 78 119 Sn 2+ 50 69 48 2. Balance the reactions using the smallest whole number coefficients. Classify each reaction. a. 1 Fe 2 (SO 4 ) 3 + 6 KOH 3 K 2 SO 4 + 2 Fe(OH) 3 DR b. 4 KClO 3 3 KClO 4 + 1 KCl D c. 2 N 2 O 5 + 2 H 2 O 4 HNO 3 S d. 2 Al + 3 FeO 1 Al 2 O 3 + 3 Fe SR 3. Draw a model of the atom, labeling the protons, neutrons, electrons and nucleus. Include the mass and charge of each sub-atomic particle. 4. Predict the products for each set of reactants - use your reference table to determine the charges. a. Mg Cl b. Li O c. Ca NO 3 MgCl 2 Li 2 O Ca(NO 3 ) 2 5. What are isotopes?
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Unformatted text preview: What makes isotopes of an element different from one another? Isotopes are atoms of an element with the same number of protons, but different number of neutrons. The atomic mass of two isotopes of the same element will be different. 6. What are ions? How does an atom become an ion? Ions are charged atoms or groups of atoms. An atom becomes an ion by gaining or losing electrons. 7. What ions are formed when the following ionic compounds dissolve in water? a. BaCl 2 b. Co 2 (SO 3 ) 3 c. AgNO 3 d. Fe(NO 2 ) 2 Ba 2+ and 2Cl-2Co 3+ and 3SO 3-2 Ag + and NO 3-Fe 2+ and 2NO 2- 8. Verify that the average atom mass of rubidium, (Rb), by using the information below: Rb-85 (72.17%) Rb-87 (27.84%) 85 amu (0.7217) + 87 amu (0.2784) = 85.56 amu...
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This note was uploaded on 01/01/2012 for the course CHEM 101 taught by Professor Donahue during the Spring '11 term at Long Island U..

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Unit 2 Review Sheet KEY - What makes isotopes of an element...

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