Chem1finalreviewjan16part1answerkey-4
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Dec 19, 2024
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LESSON | Ag Good As Gold Name 2 8 Unit Review Purpose To review the chemistry concepts covered in Unit 1: Alchemy. 1. List four ways a copper atom and a gold atom are different from each other. Sample answers: number of protons, number of nevtrons, number of electrons, electron configuration, average atomic mass 2. What are the various parts of the atom? Briefly describe each one. Nucleus: In the center of the atom. Contains protons and neutrons. Small and dense. Contains the vast majority of the mass of the atom. Difficult to alter. Proton: Particle in the nucleus. Has a positive charge. Has the same mass as a nevtron. Neuvtron: Particle in the nucleus. Has no charge. Has the same mass as a proton. Electron: Located at different distances from the nucleus. AIWays moving. Has a negative charge. Very tiny in mass. lavolved in bonding. 3. Fill in the table. b fodine 1 53 7A 53 7 radon | Rp 86, 8A 86 8 sodivm | Ng 11 1A 11 1 lead Pb 82 4A 81 4 P i e o Living By Chemistry Teaching and Classroom Masters: Units 1-3 Unit | Aichemy N3 © 2010 Key Curriculum Press Lesson 28 Worksheet: Section V i Lesson 28 As Good As Gold 239
Si=\de” YHvalence®™ and 10 wove e” 4. Draw a basic atomic model of each of these atoms: silicon, boron, fluorine, and i potasgium. How many core and valence electrons does each one have? 4-{ Fluorine Silicon Potassivm 10 core, 1 core, 2 core, 18 core, . : 4 valence 3 valence 7 valence 1valence b 5. Write down at least five things you can figure out about MgCl, just from knowing its formula. It is made of metal and nonmetal atoms, has ionic bonding, dissolves in water, conducts electricity when dissolved, is probably a brittle solid, and doesn’t conduct electricity as a ;olidi chame 20 elemaet 6. Fill in the table with your predictions. Mé, takion and dnion Au, gold Yes No N/A metallic ; SiC, silicon carbide network : No Ne N/A covalent j C,H,, propane molecular : P No Yes No covalent ‘ CuCl,, copper chloride Yes Yes Yes ionic 7. Write the cations and anions in these compounds: AlCI, Fe,0, AgO Cu$ | (AF*, 1) (F,07) (Agh,0 ) (C'ys ) | 8. Explain what an isotope is. i an atom of an element with a different number of nevtrons than ‘ another atom of the same element 9. Write one possible isotope for each of these elements: sulfur, § zinc, Zn beryllium, Be mercury, Hg sulfur-32 Zine-04 berylliom-9 mercury-200 | ¥ wmust use [sotope Graph b doutde chock that ; Nowr \'So‘l‘v‘w eXisks . | 114 Unit | Alchemy Living By Chemistry Teaching and Classreom Masters: Units 1-3 Lesson 28 ¢ Worksheet © 2010 Key Curriculum Press ‘ 240 Living By Chemistry Teacher Guide Unit | Alchemy
T 10. Complete the table for the isotopes listed. 7Cl 37 iC 4 7 13 JiFe 26 30 56 y H. Name and describe two types of radioactive decay. Ue </\lpha decay: A helium nucleus is ejected from the nucleus of a 2 larger atom. The atomic number decreases by 2. [ < Beta decay: A beta particle is ejected. The atomic number 4 e increases by 1. 12. What is the difference between nuclear fission and nuclear fusion? Nuclear fission involves the splitting of nuclei into smaller nuclei; nuclear fusion involves the Joining of two nuclei to form a larger nucleus. 13. Explain how ionic compounds are formed. by the transfer of valence electrons between metal and nonmetal atoms 14. Why don't the noble gases form jonic compounds? They have no valence electrons to transfer. 15. Making Sense Elements are made up of atoms, but atoms are not made up of elements. Explain what this statement means. Sample answer: An element is made up of one type of atom, each with the same number of protons. Atoms are made vp of smaller particles: protons, nevtrons, and electrons. 16. If You Finish Early Why isn’t it practical to try to make gold from other substances? Hwould require changing the nuclei of atoms to make gold from other substances. Nuclear chemistry is no'l‘ea?/ to control and often requires enormous amounts of energy and costs a great deal. Making gold is not cost-effective. Unit | Alchemy 115 Living By Chemistry Teaching and Classroom Masters: Units 13 Lesson 28 ¢ Worksheet © 2010 Key Curriculum Press Lesson 28 As Good As Gold 241 Section V