Name RELE SED. EOC Practice Test. Chemistry

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1 Name EO Practice Test hemistry

2 1. How many protons and electrons are in a u ion? protons, 9 electrons 7 protons, 1 electrons 9 protons, 7 electrons 9 protons, 1 electrons. What is the name of the compound with the chemical formula rl? chromium tetrachloride chromium trichloride chromium(ii) chloride chromium(iii) chloride. If two oxygen atoms combine to make a molecule, what type of bond will they form? 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? Most of an atom is empty space. lpha particles are positively charged. lpha particles move with high velocity. The center of an atom is positively charged. 5. How does an ion differ from an electrically neutral sulfur atom? S mass number atomic number nuclear charge number of electrons 6. gas under a pressure of 74 mmhg and at a temperature of 75 occupies a L container. How many moles of gas are in the container? 1.7 moles 7.9 moles 1 moles 59 moles Page 1

3 7. 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? aluminum iron nickel lead Mass vs. Volume of a Metal Volume (cm ) 8. Which orbital notation represents an s-block element in the third period? 1s s 1s s p s 1s s p s p 1s s p s p 4s d Page

4 9. What is the volume of.00 moles of nitrogen gas (N ) at STP? 11. L 8.0 L 44.8 L 56.0 L 10. ccording to this balanced chemical equation, what volume of H is required to form 40.0 L of O? 0.0 L 44.8 L 80.0 L 100 L H ( g) + 5O ( g) H O ( g) + 4O ( g) Page

5 NPI 11. In an experiment,.6 g of iron react completely with 1.50 g of sulfur. What is the empirical formula for the compound produced? FeS FeS Fe S FeS 1. What do the ions have in common? + K, + a, and l They have the same number of protons. They will form covalent bonds with oxygen. They have the same electron configuration as argon. They are larger than their corresponding atoms. Page 4

6 1. This graph represents a heating curve of a substance I II III Heating urve IV Time (min) Which region on the graph represents the solid phase? I II III IV V Page 5

7 14. When 4 19K undergoes radioactive decay, the result is two products, one of which is calcium-4. What is the other product? 4 He 4 He 1 e 1 0 e This graph is a potential energy diagram for a chemical reaction. Potential Energy iagram VI I II III Reaction oordinate V IV Which energy measure will remain unchanged with the addition of a catalyst? II IV V VI Page 6

8 16. What type of chemical reaction is represented by this balanced equation? S () s + 8O () g 8SO ( g) 8 synthesis decomposition single replacement double replacement 17. Which chemical equation is balanced? LiOH + O Li O + H O LiOH + O Li O + H O LiOH + O Li O + H O 4LiOH + O Li O + H O 18. Neutralization occurs when 15.0 ml of KOH react with 5.0 ml of HNO. If the molarity of HNO is M, what is the molarity of the KOH? 1.67 M 1.5 M M M 19. Which substance can act as either an acid or a base according to the rønsted-lowry definition? 1 HO NH + HOH Hl 0. What is the oxidation number of sulfur in aso 4? Page 7

9 1. This diagram represents a phase diagram for a substance. Phase iagram Temperature (K) t which point do solid, liquid, and gas phases exist in equilibrium? Page 8

10 . 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. Trial Solubility Graph Potassium Iodide Sodium Nitrate Potassium Nitrate Sodium hloride Potassium hlorate Temperature ( ) Student ata Temperature ( ) of Water Salt in 100 g of water (g) What is the identity of the substance? Sodium Nitrate Potassium Nitrate Sodium hloride Potassium hlorate Page 9

11 . What is the correct chemical formula for sodium sulfate? NaSO4 NaSO4 Na(SO 4) Na (SO 4) 4. Which compound contains both covalent and ionic bonds? ao O HO Nal 5. In a flexible container, 15.9 L of gas is under 589 kpa of pressure at a temperature of If the pressure and temperature change to STP, what is the new volume? 10. L 76.6 L 9.4 L 11 L 6. What are the differences between these isotopes of hydrogen shown below? 1 H, H, and H the number of electrons and the atomic number the number of protons and the atomic number the number of neutrons and the mass number the number of electrons and protons 7. What is the correct name for the acid whose chemical formula is HSO 4? hydrosulfuric acid hydrosulfurous acid sulfurous acid sulfuric acid 8. Which element is located in Group (II) and Period 6 of the periodic table? barium (a) molybdenum (Mo) radium (Ra) tungsten (W) Page 10

12 9. How many moles are in 5 g of (NH ) r O? mole mole 1.9 moles 1.7 moles 0. Which compound contains the greatest percent of oxygen by mass? O NO SO SiO 1. This balanced equation represents a chemical reaction: Δ KlO ( s) Kl( s) + O ( g) How many moles of Kl are produced when 4.5 moles of KlO decompose? 1.06 moles.1 moles 4.5 moles 8.50 moles. onsidering this balanced chemical equation, how many grams of HgO will be produced when 44 g of Hg react with excess O? Hg ( l) + O ( g) HgO ( s) 8 g 44 g 48 g 96 g. Which electron transmission in the hydrogen atom will result in the emission of red light? n = to n = n = to n = 4 n = to n = n = 4 to n = 4. What can be said of a closed system when an exothermic reaction proceeds in an aqueous solution? There is a net energy loss. There is a net energy gain. Heat is transferred from the water to the reactants. Heat is transferred from the reactants to the water. Page 11

13 5. In which group are the particles arranged in order of decreasing mass? alpha, beta, neutron alpha, neutron, beta neutron, beta, alpha neutron, alpha, beta 6. onsider this incomplete chemical equation: a + ul What are the products of this equation? al and ul aul and a al and u au and l 7. What is the best reason for using iron filings instead of an iron nail in a chemical reaction? to decrease the amount of catalyst during the reaction to increase the molecular structure during the reaction to decrease the rate of reaction to increase the surface area of the reaction 8. Which is a characteristic of a strong acid? 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 1

14 9. onsider this balanced chemical equation: Which is the oxidation half-reaction? + Zn Zn + e Zn + e Zn + H H + e + H + e H + Zn ( s) + Hl ( aq) Znl ( aq) + H ( g) 40. What is the net ionic equation for the reaction between ( ) + Pb ( aq) + l ( aq) Pbl ( s) + + NO ( aq) H ( aq) HNO ( aq) + + Pb(NO ) ( aq) Hl ( aq) Pbl ( s) HNO ( aq) Pb NO and Hl? Pb ( aq) NO ( aq) H ( aq) l ( aq) Pbl ( s) H ( aq) NO ( aq) Page 1

15 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? 1.5 atm.0 atm.5 atm 5.5 atm 4. What compound has the chemical formula MgI? di-iodide magnesium iodide(ii) magnesium magnesium iodide magnesium(i) iodine(ii) 4. Which elements have the same number of neutrons? 10 5 and Mn and 56 6 Fe g and 11 u and d 80 Hg Page 14

16 44. This chart represents the melting point of several substances. Substance l Na Nal What best explains the high melting point of the salt? the strong electrostatic attraction between the weak electrostatic attraction between the weak electrostatic attraction between the strong electrostatic attraction between Melting Point ( ) Na and 0 Na and l l 0 + Na and l 0 + Na and l 45. ased on the VSEPR theory, what is the molecular geometry of O? linear tetrahedral trigonal planar trigonal pyramidal Page 15

17 46. This graph represents a phase diagram for a substance What is the state of the substance at point I? gas liquid liquid and gas solid and liquid 47. Which one of these compounds is soluble in water? aluminum sulfide calcium carbonate Phase iagram F H 50 G E K Temperature ( ) iron(iii) hydroxide potassium sulfate S I 48. In which block does an element with the electron configuration [Xe] 6s 4f 5d 6p belong? s block p block d block f block Page 16

18 49. Which statement is true for the reaction represented by this equation? H + O O + H O 4 1 gram of H 4 is required to react with grams of O. 1 gram of H 4 is required to react with 4 grams of O. 1 mole of H 4 is required to react with moles of O. 1 mole of H 4 is required to react with 4 moles of O. 50. What is the percent by mass of N in a ( N )? 15.1% 1.19% 0.4% 4.9% 51. Which orbital notation shows the lowest energy arrangement of valence electrons for 1s s p? s s s s p p p 5. What is the molarity of 8.9 g of al dissolved in water to make 0.78 L of solution? 0. M 0.69 M 1.5 M.0 M Page 17

19 5. The half-life of phosphorus- is 14. days. How much of a sample of phosphorus- will remain after 57. days? To increase the temperature of g of HO () s from 50.0 to 10.0, how much energy is required? J J J J 55. What is the [ H ] of an Hl solution if the ph is measured to be 6? M M + 6 M M Page 18

20 56. This balanced equation represents a chemical reaction. H () g + 1O () g 8O () g + 10HO () g 4 10 What type of chemical reaction is represented by the equation? combustion decomposition double replacement single replacement 57. This balanced equation represents a chemical reaction using palladium, Pd, as a catalyst. O ( g) + H O ( l) H O ( l ) (Pd) Without palladium the reaction is slow and produces low concentrations of product. How does the palladium increase the speed of the reaction? 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? Na and al Zn and al a and al K and al Page 19

21 59. What is the net ionic equation for the reaction between aqueous solutions of Lir and gno? + g ( aq) + r ( aq) gr ( s) + + Li ( aq) NO ( aq) LiNO ( s) + Li ( aq) + r ( aq) Lir ( s) + + g ( aq) NO ( aq) gno ( s) 60. scientist hypothesizes that a colorless gas produced during a chemical reaction is carbon dioxide. Which observation would confirm this hypothesis? The gas will react violently with water. glowing splint placed in the gas will burn brighter. urning the gas in the presence of oxygen will produce water. ubbling the gas through lime water will make the lime water cloudy. STOP End of hemistry Test Page 0

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