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Chemistry Test Form 1 Part A: Match the letter of the correct definition to the Vocabulary term. 1. Octet Rule A. A reaction in which one substance breaks down into its parts. 2. Ion B. A bond that is formed by sharing electrons. 3. Charge C. A charged atom. D. The number of electrons an 4. Covalent Bond element is willing to gain, lose, or share to form compounds. 5. Ionic Bond E. States that all elements want either a full outer shell or eight 6. Subscript electrons in their outer electron shell. 7. Polyatomic Ion F. A multiplier. It is used to balance equations. 8. Synthesis Reaction G. A reaction in which two reactant compounds switch ions. 9. Decomposition Reaction H. This number tells the number of atoms of one element in a 10. Single Displacement Reaction compound. I. Bonds formed by gaining and losing 11. Double Displacement Reaction electrons. J. A group of atoms that act as a 12. Reactants single charged ion. K. States that matter cannot be 13. Products created or destroyed. L. A reaction in which two or more 14. Law of Conservation of Matter reactants combine to form one new product. 15. Coefficient M. What is made during a reaction N. The chemicals that undergo a reaction. O. A reaction in which one element replaces another in a compound. Part B: True/False. You may earn extra credit by correcting false answers. __________16. If an atom’s charge is positive, it has lost electrons. __________17. If an atom’s charge is negative, it has lost protons. __________18. You balance an equation by changing subscripts. __________19. You can only put a coefficient in front of a compound. __________20. The number of atoms on both sides of an equation must be equal for each element. Part C: For each of the following compounds, identify the number of atoms of each element. 21. Na2SO4 Na= _____ S= ______ O= _____ 22. 3H2CO3 H=_____ C= _____ O= _____ 23. Fe(NO3)3 Fe= _____ N= _____ O= _____ Part D: Write the correct chemical formulas for the following pairs of ions. 24. Ca2+ NO3 1- _________ 25. Cu2+ F1- __________ 26. Ca2+ CO32- __________ Part E: Identify each reaction as synthesis (S), decompostion (D), single displacement (SD), or double displacement (DD). _____27. AgNO3 + NaCl AgCl + NaNO3 _____28. C + O2 CO2 _____29. Fe + 2HCl Fe Cl2 + H2 _____30. H2CO3 H2O + CO2 Part F: Identify each of the folowing equations as balanced (B) or not balanced (NB). _____31. 2HgO + Cl2 2HgCl + O2 _____32. Na + Br2 2NaBr _____33. AgNO3 + NaCl AgCl + NaNO3 Part G: Balance the following equations. 34. C + H2 CH4 35. Mg + O2 MgO Part G: Multiple Choice _____35. An atom’s atomic number is equal to the number of a. the total protons and neutrons b. protons c. the total electrons and neutrons d. neutrons _____36. The scientists who developed the format of the modern Periodic Table are a. Mendeleev and Meyer b. Darwin and Mosart c. Mendel and Meyerson d. Oscar and Meyer _____37. The Periodic Table is arranged by a. Atomic number b. Atomic number and properties c. properties d. number of electrons **BONUS** 1. Balance: C8H18 + O2 CO2 + _____39. The Mass number is equal to the number of a. protons b. the total protons and neutrons. c. the total electrons and neutrons d. neutrons _____40. Valence electrons are a. the electrons in the outer electron shell. b. The electrons in the first electron shell. c. the total number of electrons. d. the number of electrons and atom is wiling to gain, lose, or share. H 2O 2. What about an atom’s atomic structure determines its chemical reactivity? 3. Explain the following cartoon on the back of this page.