PRACTICE COMPREHENSIVE EXAM #1 7 th GRADE CHEMISTRY

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1 Name: Date: Class: PRACTICE COMPREHENSIVE EXAM #1 7 th GRADE CHEMISTRY BUBBLE SHEETS AND PERIODIC TABLES ARE ATTACHED. PLEASE DETACH. YOU MAY WRITE ON THE PERIODIC TABLE. PART ONE: Multiple choice. Choose the best answer. You may use a scientific calculator no graphing calculators allowed. As you go, fill in the appropriate bubble on the bubble sheet attached (do NOT fill in the bubbles last). Double check your answers make sure the exam and bubble sheet match. 1. are chemically the simplest substances and hence cannot be broken down using chemical reactions. a. Compounds c. Protons b. Molecules d. Elements 2. LiNO 3(aq) is an example of a. a. Compound c. Molecule b. Element d. Mixture 3. N 2 (g) is an example of a(n). a. Compound c. Phase b. Element d. Mixture 4. Which particle diagram(s) represent(s) a compound? a. A c. B b. A and B d. C 5. If a spoonful of NaF is mixed in a glass of water, what is the mixture called? a. solute c. solvent b. solution d. element 6. An element is. a. a mixture of atoms c. a substance whose atoms all have the same number of protons b. a solution d. a substance whose atoms all have the same number of neutrons 1 st Practice Comp Exam 7 th Grade 1

2 7. Identify the homogeneous mixture below: a. suspension of dirt and water c. salt and sand b. steel d. soil 8. If you made 50 ml of Ba(NO 3) 2(aq), the solvent used to make this solution is. a. water c. isopropanol b. Ba(NO 3) 2 d. benzene 9. What is the electron configuration of a neutral atom of Sulfur? a. [Ne]3p 6 c. 1s 2 2s 2 2p 4 b. 1s 2 2s 2 3s 2 2p 6 3p 2 d. 1s 2 2s 2 2p 6 3s 2 3p What is the electron configuration of a calcium ion? a. 1s 2 2s 2 2p 6 3s 2 3p 2 c. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 b. 1s 2 2s 2 2p 6 3s 2 3p 6 d. 1s 2 2s 2 2p 6 3s 2 3p 6 4s What is the electron configuration of a Silicon cation? a. 1s 2 2s 2 2p 6 c. 1s 2 2s 2 3s 2 2p 2 b. 1s 2 2s 2 2p 6 3s 2 3p 6 d. [Ar] 12. Which element has two unpaired electrons in the 2p sublevel? a. F c. O b. Cl d. P 13. Which atom/ion has the electron configuration 1s 2 2s 2 2p 6? a. N c. P 3- b. Cl - d. Al How many valence electrons are present in an atom with the following electron configuration: 1s 2 2s 2 2p 6 3s 2 3p 2? a. 1 c. 3 b. 2 d A neutral element with the electron configuration 1s 2 2s 2 2p 6 3s 2 3p 1 would most likely form which ion? a. 1+ c. 3+ b. 2+ d Select the list of atoms that are arranged in order of increasing atomic radius. a. C. N, O, F c. As, P, S, O b. S, As, Sn, Tl d. Sb, Bi, N, As 17. Select the list of atoms that are arranged in order of increasing ionization energy. a. Cl, F, I, Br c. Po, Te, Se, S b. Na, Mg, Sr, Li d. Mg, Al, Cl, S 18. Choose the correct relationship concerning ionic/atomic radius. a. Br > Br - c. Ga > Ga 3+ 1 st Practice Comp Exam 7 th Grade 2

3 b. Mn < Mn 6+ d. Se > Se What is the correct chemical formula for manganese (VI) phosphate? a. Mn 6PO 4 c. Mn(PO 4) 2 b. Mn 3(PO 4) 4 d. Mn(PO 4) What is the correct chemical formula for gold (II) periodate? a. Au(IO 4) 3 c. Au 2IO 4 b. Au(IO 4) 2 d. Au 2IO NH 4NO 2 is. a. ammonium nitrate c. ammonium nitrite b. ammonium (I) nitrite d. denitrogen tetrahydride dioxide 22. Tin (IV) oxide is. a. Sn 4O c. SnO 2 b. Sn 2O 4 d.sn(oh) If RaSO 4 is radium sulfate, what is the chemical formula for beryllium sulfate? a. BeSO 4 c. BeSO 3 b. Be 2SO 4 d. BaSO In the formula X 2(SO 4) 3, the X represents a metal. This metal could be located on the Periodic Table in a. Group 1 c. Group 2 b. Group 13 d. Group Which formula correctly represents the composition of iron (III) oxide? a. FeO 3 c. Fe 2O 3 b. Fe 3O d. Fe 3O Given the balanced equation representing a reaction: What kind of reaction is represented by this equation? a. synthesis c. decomposition b. single replacement d. double replacement 27. Which change results in the formation of different substances? a. burning of propane c. deposition of CO 2(g) b. melting of NaCl (s) d. solidification of water 28. Given the word equation: sodium chlorate sodium chloride + oxygen Which type of chemical reaction is represented by this equation? a. double replacement c. decomposition b. single replacement d. synthesis 1 st Practice Comp Exam 7 th Grade 3

4 29. In which type of chemical reaction do two or more reactants combine to form one product, only? a. synthesis c. precipitation b. decomposition d. double replacement 30. Given the unbalanced equation: When the equation is balanced using the smallest whole-number coefficients, what is the coefficient of Al? a. 1 c. 3 b. 2 d Given the unbalanced equation: When the equation is balanced using the smallest whole-number coefficients, what is the coefficient of O 2? a. 1 c. 3 b. 2 d What is the proper Lewis structure of hydrogen cyanide, HCN? a. c. b. d. 33. How many electrons does Carbon have in its outer shell in CCl 4? a. 4 c. 8 b. 6 d st Practice Comp Exam 7 th Grade 4

5 34. In the Lewis structure for phosphorous trichloride, the central atom has. a. two double bonds and one lone pair c. three single bonds and one lone pair b. four single bonds and no lone pairs d. two double bonds and no lone pairs 35. From the balanced equation below, how many moles of hydrogen gas will be produced if 0.27 moles of hydrochloric acid is completely reacted? 2HCl(aq) + Fe(s) FeCl 2(aq) + H 2(g) a mol H 2 c mol H 2 b mol H 2 d g H Determine the number of moles of Sn(l) produced when 4.0 moles of H 2(g) is completely consumed in excess of SnO 2. a. 1.0 mol Sn(l) c. 4.0 mol Sn(l) b. 2.0 mol Sn(l) d. 6.0 mol Sn(l) 37. Given the balanced equation below: Ba 3N H 2O 3 Ba(OH) NH 3 If 79.4 g of water is reacted in excess Ba 3N 2, how many grams of ammonia will be produced? a g NH 3 c. 225 g NH 3 b g NH 3 d. 239 NH Given the balanced equation below: 2 As + 6 NaOH 2 Na 3AsO H 2 If 1.35 mol of sodium hydroxide is reacted, how many grams of hydrogen will be produced? a g H 2 c g H 2 b g H 2 d g H 2 1 st Practice Comp Exam 7 th Grade 5

6 39. What is the limiting reagent in the reaction diagram below? a. O 2 c. H 2 b. CH 4 d. H 2O 40. Calculate the molarity of a 3.5 L solution containing 66.8 g of lithium nitrate. a M c M b M d. 3.6 M 41. What type of reaction is 8 Fe + S 8 8 FeS? a. synthesis c. precipitation b. decomposition d. neutralization 42. What type of reaction is HBr (aq)+ NaOH (aq) NaBr (aq) + H 2O (l) a. synthesis c. precipitation b. decomposition d. neutralization 43. What type of reaction is C 10H O 2 10 CO H 2O a. synthesis c. precipitation b. decomposition d. combustion 44. In a reaction mixing solutions of lithium sulfate and iron (II) chloride, what will the precipitate be (if any)? a. lithium chloride (s) c. iron (II) lithium (s) b. iron (II) sulfate (s) d. there is no precipitate 45. In a reaction mixing solutions of calcium nitrate and magnesium perchlorate, what will the precipitate be (if any)? a. CaClO 3 (s) c. MgNO 3 (s) b. Ca(ClO 4) 2 (s) d. Mg(NO 3) 2 (s) 46. Soluble salts in water. 1 st Practice Comp Exam 7 th Grade 6

7 a. dissociate c. dissolve and form homogeneous solutions b. break apart into cations and anions d. all of the above 47. What is the correct net ionic equation for the molecular equation below: 2NaOH + MgCl 2 Mg(OH) 2 +2 NaCl a. 2Na + (aq) + 2OH - (aq) + Mg 2+ (aq) + 2Cl - (aq) Mg(OH) 2 (s) + 2Na + (aq) + 2Cl - (aq) b. 2Na + (aq) + 2OH - (aq) + Mg 2+ (aq) + Cl 2 - (aq) Mg(OH) 2 (s) + 2Na + (aq) + Cl 2 - (aq) c. 2OH - (aq) + Mg 2+ (aq) ) Mg(OH) 2 (s) d. 2Na + (aq) + 2Cl - (aq) 2Na + (aq) + 2Cl - (aq) 1 st Practice Comp Exam 7 th Grade 7

8 -- PRACTICE NATIVE EXAM -- PART TWO: Short answer. Read and answer the questions carefully. No bubble sheets required. Multiple choice: Circle the best answer. (2pts each) 1. Why does atomic radius decrease as you move from bottom to top up the Periodic table? a. decreasing size/number of electron shells b. decreasing numbers of protons c. decreasing numbers of electrons d. decreasing numbers of neutrons 2. Which element is most electronegative? a. Copper b. Tin c. Sulfur d. Cesium 3. Which element is least electronegative? a. Calcium b. Beryllium c. Carbon d. Arsenic 4. Write the chemical formula. (3pts each) a. Copper (II) sulfate b. Barium carbonate c. Mercury (I) hydroxide 5. For each decomposition reaction, write the reactant and predict the product(s). You do not have to include phases or balance the final chemical equations. (3pts each) a. iron (III) chlorate = b. lithium iodide = c. magnesium carbonate = 1 st Practice Comp Exam 7 th Grade 8

9 d. sodium hydroxide = 6. If g of mercury (II) hydroxide is reacted with ml of a 2.7 M solution of phosphoric acid, what is the limiting reactant and what is the excess reactant? Write your answers on the lines. Show work below, including units. (6pts) 3 Hg(OH) H 3 PO 4 Hg 3 (PO 4 ) H 2 O LR = ER = 7. Diagram (with Bohr model) how an ionic compound forms between Li and N. Make sure your drawing is easy to understand and includes the following: a. each atom has correct electron shells (2pts) b. each atom has correct valence electrons (2pts) c. arrows drawn to show movement of electrons and the resulting ions / bond (2pts) d. What is the chemical formula for neutral compound? (2pts): 1 st Practice Comp Exam 7 th Grade 9

10 8. Electron Configuration a. Draw a complete box diagram for a neutral atom of Chlorine. (4pts) b. Circle the valence electrons. (1pt) 9. In complete sentences, which lab did you learn the most from? Why? (3pts) 1 st Practice Comp Exam 7 th Grade 10

11 YOU GOT THIS! 1 st Practice Comp Exam 7 th Grade 11

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