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Test Booklet Subject: SC, Grade: HS 2008 Grade High School Chemistry Student name: Author: North Carolina District: North Carolina Released Tests Printed: Tuesday July 17, 2012 2008 Grade High School Chemistry 2+ 1 How many protons and electrons are in a 64 29 Cu SC:HS 5 How does an S2− ion differ from an electrically ion? neutral sulfur atom? A B C D A B C D 27 protons, 29 electrons 27 protons, 31 electrons 29 protons, 27 electrons 29 protons, 31 electrons 2 What is the name of the compound with the chemical formula CrCl3 ? A B C D chromium tetrachloride chromium trichloride chromium(II) chloride chromium(III) chloride mass number atomic number nuclear charge number of electrons 6 A gas under a pressure of 74 mmHg and at a temperature of 75◦ C occupies a 500.0-L container. How many moles of gas are in the container? A B C D 1.7 moles 7.9 moles 13 moles 59 moles 3 If two oxygen atoms combine to make a molecule, what type of bond will they form? A B C D an ionic bond a hydrogen bond a double covalent bond a metallic bond 4 Why did most of the alpha particles go straight through the gold foil in Rutherford’s experiment? A B C D Page 1 Most of an atom is empty space. Alpha particles are positively charged. Alpha particles move with high velocity. The center of an atom is positively charged. Go On 2008 Grade High School Chemistry SC:HS 7 A chemistry student is given 5 samples of a metal. The student measures and records the mass and the volume of each sample and then graphs the data, as shown below. What is the identity of the metal? A B C D Page 2 aluminum iron nickel lead Go On 2008 Grade High School Chemistry SC:HS 8 Which orbital notation represents an s-block element in the third period? A B C D 9 What is the volume of 2.00 moles of nitrogen gas ( N2 ) at STP? A B C D Page 3 11.2 L 28.0 L 44.8 L 56.0 L Go On 2008 Grade High School Chemistry SC:HS 10 According to this balanced chemical equation, what volume of C2 H2 is required to form 40.0 L of CO2 ? 2C2 H2 (g) + 5O2 (g) → 2H2 O (g) + 4CO2 (g) A B C D 20.0 L 44.8 L 80.0 L 100 L 11 In an experiment, 2.62 g of iron react completely with 1.50 g of sulfur. What is the empirical formula for the compound produced? A B C D FeS FeS2 Fe2 S Fe2 S3 12 What do the ions K+ , Ca2+ , and Cl− have in common? A They have the same number of protons. B They will form covalent bonds with oxygen. C They have the same electron configuration as argon. D They are larger than their corresponding atoms. Page 4 Go On 2008 Grade High School Chemistry SC:HS 13 This graph represents a heating curve of a substance. Which region on the graph represents the solid phase? A B C D Page 5 I II III IV Go On 2008 Grade High School Chemistry 14 When 42 19 K undergoes radioactive decay, the result SC:HS 16 What type of chemical reaction is represented by is two products, one of which is calcium-42. What is the other product? this balanced equation? A 42 He B 24 He C 11 e D 0−1 e A B C D 15 This graph is a potential energy diagram for a chemical reaction. S8 (s) + 8O2 (g) → 8SO2 (g) synthesis decomposition single replacement double replacement 17 Which chemical equation is balanced? A B C D LiOH + CO2 → Li2 CO3 + H2 O 2LiOH + CO2 → Li2 CO3 + H2 O LiOH + 3CO2 → 2Li2 CO3 + H2 O 4LiOH + CO2 → Li2 CO3 + 2H2 O 18 Neutralization occurs when 15.0 mL of KOH react with 25.0 mL of HNO3 . If the molarity of HNO3 is 0.750 M , what is the molarity of the KOH? Which energy measure will remain unchanged with the addition of a catalyst? A B C D Page 6 A B C D 1.67 M 1.25 M 0.600 M 0.450 M 19 Which substance can act as either an acid or a base II according to the Brønsted-Lowry definition? IV A B C D V VI H3 O1+ NH1+ 4 HOH HCl Go On 2008 Grade High School Chemistry SC:HS 20 What is the oxidation number of sulfur in BaSO4 ? A B C D -2 0 +1 +6 21 This diagram represents a phase diagram for a substance. At which point do solid, liquid, and gas phases exist in equilibrium? A B C D Page 7 1 2 3 4 Go On 2008 Grade High School Chemistry SC:HS 22 Using the solubility graph provided, a student performs an experiment to find the solubility of a substance. The student finds the amount of substance needed to make a saturated solution in 100 g of water at different temperatures. The student’s data are shown in the table below the graph. What is the identity of the substance? A B C D Page 8 Sodium Nitrate Potassium Nitrate Sodium Chloride Potassium Chlorate Go On 2008 Grade High School Chemistry SC:HS 23 What is the correct chemical formula for sodium 27 What is the correct name for the acid sulfate? whose chemical formula is H2 SO4 ? A B C D A B C D NaSO4 Na2 SO4 Na (SO4 )2 Na2 (SO4 )2 24 Which compound contains both covalent and ionic hydrosulfuric acid hydrosulfurous acid sulfurous acid sulfuric acid 28 Which element is located in Group 2 (IIA) and bonds? Period 6 of the periodic table? A B C D A B C D CaCO3 CO2 H2 O NaCl 25 In a flexible container, 15.9 L of gas is under 589 ◦ kPa of pressure at a temperature of 56.5 C. If the pressure and temperature change to STP, what is the new volume? A B C D 10.2 L 76.6 L 92.4 L radium (Ra) tungsten (W) 29 How many moles are in 325 g of (NH4 )2 Cr2 O7 ? A B C D 0.732 mole 0.776 mole 1.29 moles 1.37 moles oxygen by mass? hydrogen shown below? 1 2 1 H, 1 H, Page 9 molybdenum (Mo) 30 Which compound contains the greatest percent of 112 L 26 What are the differences between these isotopes of A B C D barium (Ba) and 3 1H the number of electrons and the atomic number A B C D CO2 NO2 SO2 SiO2 the number of protons and the atomic number the number of neutrons and the mass number the number of electrons and protons Go On 2008 Grade High School Chemistry SC:HS 31 This balanced equation represents a chemical reaction: 2KClO3 (s) 2KCl (s) + 3O2 (g) How many moles of KCl are produced when 4.25 moles of KClO3 decompose? A B C D 1.06 moles 2.13 moles 4.25 moles 8.50 moles 32 Considering this balanced chemical equation, how 34 What can be said of a closed system when many grams of HgO will be produced when 44 g of Hg react with excess O2 ? an exothermic reaction proceeds in an aqueous solution? 2Hg (l) + O2 (g) → 2HgO (s) A B C D 28 g 44 g reactants. 48 g 96 g 33 Which electron transmission in the hydrogen atom will result in the emission of red light? A B C D A There is a net energy loss. B There is a net energy gain. C Heat is transferred from the water to the n = 2 to n = 3 n = 2 to n = 4 n = 3 to n = 2 n = 4 to n = 2 Page 10 D Heat is transferred from the reactants to the water. 35 In which group are the particles arranged in order of decreasing mass? A B C D alpha, beta, neutron alpha, neutron, beta neutron, beta, alpha neutron, alpha, beta Go On 2008 Grade High School Chemistry SC:HS 36 Consider this incomplete chemical equation: Ba + CuCl2 → What are the products of this equation? A B C D BaCl2 and CuCl2 BaCuCl2 and Ba BaCl2 and Cu BaCu and Cl2 37 What is the best reason for using iron filings instead of an iron nail in a chemical reaction? A to decrease the amount of catalyst during the reaction B to increase the molecular structure during the reaction C to decrease the rate of reaction D to increase the surface area of the reaction 38 Which is a characteristic of a strong acid? A B C D It has a pH greater than 7. It completely ionizes in solution. It contains many hydroxide ions. It reacts only with a strong base. Page 11 Go On 2008 Grade High School Chemistry SC:HS 39 Consider this balanced chemical equation: Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g) Which is the oxidation half-reaction? A B C D Zn → Zn2+ + 2e− Zn + 2e− → Zn2+ 2H+ → H2 + 2e− 2H+ + 2e− → H2 40 What is the net ionic equation for the reaction between Pb (NO3 )2 and HCl? A B C D Pb2+ (aq) + 2Cl− (aq) → PbCl2 (s) + 2NO− (aq) → 2HNO3 (aq) 3 (aq) + 2H Pb (NO3 )2 (aq) + 2HCl (aq) → PbCl2 (s) + 2HNO3 (aq) − + Pb3+ (aq) + 2NO− (aq) → PbCl2 (s) + 2H+ (aq) + 2NO− 3 (aq) + 2H 2Cl 3 (aq) 41 When combined, two gases have a pressure of 4.0 atm. If one gas has a pressure of 1.5 atm, what is the pressure of the second gas? A B C D 1.5 atm 2.0 atm 2.5 atm 43 Which elements have the same number of neutrons? A B C D 10 5 B, and 12 6 C 55 25 Mn, and 56 26 Fe 108 47 Ag, and 112 48 Cd 197 79 Au, and 201 80 Hg 5.5 atm 42 What compound has the chemical formula MgI2 ? A B C D di-iodide magnesium iodide(II) magnesium magnesium iodide magnesium(I) iodine(II) Page 12 Go On 2008 Grade High School Chemistry 44 This chart represents the melting point of several substances. SC:HS 46 This graph represents a phase diagram for a substance. What best explains the high melting point of the salt? A the strong electrostatic attraction between Na0 and Cl0 B the weak electrostatic attraction between Na0 and Cl0 C the weak electrostatic attraction between Na+ and Cl− D the strong electrostatic attraction between Na+ and Cl− What is the state of the substance at point I ? 45 Based on the VSEPR theory, what is the molecular geometry of CO2 ? A B C D linear tetrahedral A B C D gas liquid liquid and gas solid and liquid trigonal planar trigonal pyramidal 47 Which one of these compounds is soluble in water? A B C D Page 13 aluminum sulfide calcium carbonate iron(III) hydroxide potassium sulfate Go On 2008 Grade High School Chemistry 48 In which block does an element with the electron 2 14 10 1 SC:HS 51 Which orbital notation shows the lowest energy configuration [Xe] 6s 4f 5d 6p belong? arrangement of valence electrons for 1s2 2s2 2p3 ? A B C D A 2s s block p block d block f block B 2s 2p C 2s 2p D 2s 2p 49 Which statement is true for the reaction represented by this equation? CH4 + 2CO2 → CO2 + 2H2 O A 1 gram of CH4 is required to react with 2 grams of O2 . B 1 gram of CH4 is required to react with 4 grams of O2 . C 1 mole of CH4 is required to react with 2 moles of O2 . D 1 mole of CH4 is required to react with 4 moles of O2 . 50 What is the percent by mass of N in Ca (CN)2 ? A B C D 15.21% 21.19% 30.42% 42.39% Page 14 52 What is the molarity of 28.9 g of CaCl2 dissolved in water to make 0.78 L of solution? A B C D 0.33 M 0.69 M 1.5 M 3.0 M 53 The half-life of phosphorus-32 is 14.3 days. How much of a sample of phosphorus-32 will remain after 57.2 days? A B C D 1 32 1 16 1 8 1 4 Go On 2008 Grade High School Chemistry SC:HS 54 To increase the temperature of 100.0 g of H2 O from -50.0◦ C to -10.0◦ C, how much energy is required? A B C D 1.67 × 104 J 8.20 × 103 J 8.08 × 103 J 1.95 × 103 J 55 What is the [ H+ ] of an HCl solution if the pH is measured to be 6? A B C D 1 × 10−7 M 1 × 10−6 M 6 × 10−6 M 8 × 10−1 M Page 15 Go On 2008 Grade High School Chemistry SC:HS 56 This balanced equation represents a chemical reaction. 2C4 H10 (g) + 13O2 (g) → 8CO2 (g) + 10H2 O (g) What type of chemical reaction is represented by the equation? A B C D combustion decomposition double replacement single replacement 57 This balanced equation represents a chemical reaction using palladium, Pd, as a catalyst. CO2 (g) + H2 O (l) H2 CO3 (l) Without palladium the reaction is slow and produces low concentrations of product. How does the palladium increase the speed of the reaction? A B C D The palladium reacts with the water. The palladium lowers the activation energy. The palladium purifies the carbon dioxide. The palladium increases the reaction temperature. 58 Which pair of substances will likely undergo a single replacement reaction? A B C D Na and BaCl2 Zn and BaCl2 Ca and BaCl2 K and BaCl2 Page 16 59 What is the net ionic equation for the reaction between aqueous solutions of LiBr and AgNO3 ? A B C D Ag+ (aq) + Br− (aq) → AgBr (s) Li+ (aq) + NO− 3 (aq) → LiNO3 (s) Li+ (aq) + Br− (aq) → LiBr (s) Ag+ (aq) + NO− 3 (aq) → AgNO3 (s) 60 A scientist hypothesizes that a colorless gas produced during a chemical reaction is carbon dioxide. Which observation would confirm this hypothesis? A The gas will react violently with water. B A glowing splint placed in the gas will burn brighter. C Burning the gas in the presence of oxygen will produce water. D Bubbling the gas through lime water will make the lime water cloudy. STOP