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1st Semester Chemistry Final Exam Study Guide 2012-13 Significant Digits Be able to identify the correct number of significant digits in a given number. How many digits are in: 1a. 100 = _________ b. 0.00339= _________ c. 801.010= __________ Be able to calculate using significant digits 2a. 62.1 x 0.022 = __________ b. 4.559 + 12= ___________ c. 735 – 435 = ____________ Quantum numbers Know 4 Quantum numbers; what each stands for and their correct order. 3a. Quantum number ________ Stands for: _____________________________________ b. Quantum number ________ Stands for: _____________________________________ c. Quantum number ________ Stands for: _____________________________________ d. Quantum number ________ Stands for: _____________________________________ Metric Conversions Know what each metric prefix stands for; their correct order and be able to convert them. 4a. Prefix ________ Stands for: _____________________________________ b. Prefix ________ Stands for: _____________________________________ c. Prefix ________ Stands for: _____________________________________ d. Prefix ________ Stands for: _____________________________________ e. Prefix ________ Stands for: _____________________________________ f. Prefix ________ Stands for: _____________________________________ g. Prefix ________ Stands for: _____________________________________ h. Prefix ________ Stands for: _____________________________________ The Periodic Table Know the versions of the periodic table and the scientist who created them: 5a. Scientist name _________________________________ Table design ___________________________________________________________________ ______________________________________________________________________________ b. Scientist name _________________________________ Table design ___________________________________________________________________ ______________________________________________________________________________ c. Scientist name _________________________________ Table design ___________________________________________________________________ ______________________________________________________________________________ d. Scientist name _________________________________ Table design ___________________________________________________________________ ______________________________________________________________________________ Know what an oxidation number is, how it is used and where to find it on the periodic table. Know that the periodic table is organized by periods and groups. Know what a period is and what a group is. 6a. Period is: __________________________________________________ b. Group is: __________________________________________________ 7a. Elements in the same period have the same _________________________________. b. Elements in the same group have similar ___________________________________. Be able to identify an element’s period and group. 8a. The period and group for Magnesium is ____________________. b. The electron configuration of a certain element ends in 4p4. The period and group for this element is: _______________________________ Be able to identify any element as a metal, nonmetal, noble gas or metalloid. 9a. Calcium is a ____________ b. Chlorine is a ______________ c. Silicon is a _______________ Know that the metals have 3 or less electrons in the outer level and nonmetals have 5 or more. Know that an element’s physical and chemical properties are the result of its atomic number. Know what ions and isotopes are. 10 a. An ion is a ___________________________________________________________. b. An isotope is a: ______________________________________________________. Electrons Know how many electron pairs total number of electrons each of the sublevels can hold. 11a. Sublevel __________ # of electron pairs____________ total number of electrons ________ b. Sublevel __________ # of electron pairs____________ total number of electrons ________ c. Sublevel __________ # of electron pairs____________ total number of electrons ________ d. Sublevel __________ # of electron pairs____________ total number of electrons ________ Be able to write the longhand and shorthand electron configurations for any element. 12a. Aluminum: Longhand _______________________________________________ Shorthand _______________________________________________ b. Iron: Longhand _______________________________________________ Shorthand _______________________________________________ c. Galium: Longhand _______________________________________________ Shorthand _______________________________________________ Be able to draw the Lewis Dot Diagram for any element. 13a. Aluminum b. Iron c. Gallium Be able to use the Pyramid of Stability to determine any element’s stability. 14a. Chromium _____________________ b. Copper ______________________ c. Zinc _____________________ d. Yttrium ______________________ Chemical Formulas and Equations Be able to write the correct formula for any given compound. 15a. Sodium Sulfate Formula: _________________________________ b. Lead (IV) Phosphide Formula: _________________________________ c. Ammonium Nitride Formula: _________________________________ Be able to determine how many atoms of each element are in a given compound. 16a. Na(C2H3O2) # of atoms _____________________ b. Be3N2 # of atoms _____________________ c. Pb3(PO4)4 # of atoms _____________________ Be able to identify the products and reactants in a chemical equation: Co(NO3)2 + Zn Zn(NO3)2 + Co 17a The reactants are: ________________________ b. The products are: ________________________ Be able to balance a chemical equation. 18a. ______ C2H4 + ______ O2 ______ CO2 + ______ H2O b. ______ Al + ______ Fe3N2 ______ AlN + ______ Fe c. ______ Ca(CO3) + ______ H3(PO4) ______ Ca3(PO4)2 + ______ H2(CO3) Be able to identify each of the 4 reaction types and predict their products and balance the equation.. 19.a. Rxn _____ ______ Ag2S b. Rxn ______ ______ ZnS + ______ AlP c. Rxn ______ ______ C3H8 + ______ O2 20. Predict the products, balance the equation and identify the reaction for the following reactions: a. Silver(I) Nitrate + Zinc Chloride b. Magnesium Bromide + Chlorine c. Methane (CH4) + Oxygen Mole conversions Be able to calculate moles to grams, grams to moles. 21a. How many moles are in 11.1g of NaCl? b. How many grams are in 8.62 moles of K(SO3)? c. How many grams are in 3.39 moles of Vanadium Oxide? % Composition Be able to determine the % composition of the elements in any given compound. 22a. What is the percent composition of each of the elements in Sn(CO3)2? b. What is the percent composition of each of the elements in Iron (III) Iodide? Empirical Formula Be able to determine an element’s empirical formula form its molecular formula. 23a. Molecular formula: C2H4O2 Empirical formula ________________ b. Molecular formula: SnO Empirical formula ________________ Be able to calculate an element’s empirical formula using the information given. 24a. Determine the empirical formula of a compound containing 38.7% C, 16.1% H, and 45.2% N. b. What is the empirical formula of a compound if a 50.0 g sample contains 9.1g Na, 20.6g Cr and 22.2 g O? Be able to calculate an element’s molecular formula using the information given: 25a. A compound contains 18.8% sodium, 29.0% chlorine, and 52.2% oxygen, by mass. If the molecular mass of the compound is 122.44 g/mol, determine the molecular formulas. b. A 4.99 gram sample of a compound contains 1.52 grams of nitrogen atoms and 3.47 grams of oxygen atoms. The molecular mass is 92.04 g. What is the compound’s molecular formula?