2. The formula for the compound formed from K + and Cr2O7 2- is:

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1 Chemistry 30S Exam Practice Multiple Choice. 1. The total number of ions represented by the formula Mg(H2PO4)2 is: a) 4 b) 3 c) 13 d) The formula for the compound formed from K + and Cr2O7 2- is: a) (Cr2O7)2K b) KCr2O7 c) K2Cr2O7 d) (Cr2O7)2K2 3. The formula for the compound formed from SO4 2- and Al 3+ is: a) Al2(SO4)3 b) (SO4)2Al3 c) (SO4)Al d) Al3(SO4)2 4. Which describes a relationship between 3-methylpentane and 2,2-dimethylbutane a) They have the same chemical properties. b) They have the same structural formula. c) They have the same molecular formula. d) They have the same physical properties. 5. The temperature at which the vapour pressure of a liquid reaches atmospheric pressure is the: a) Vaporization temperature. b) Condensation temperature. c) Atmospheric temperature. d) Boiling temperature 6. What is the number of moles of iron (III) oxide, Fe2O3, in a sample whose mass is g? a) 4.06 moles c) 9.05 moles b) 2.03 moles d) 1.01 moles e) 7. What is the number of grams of phosphorus in 0.40 moles of Ca3(PO4)2? a) 596 g c) 248 g b) 62 g d) 124 g 8. Which sample of O2 contains 9.03 x molecules? a) 0.75 mole b) 1.5 mole c) 3.0 mole d) 0.67 mole 9. The name given to the organic halide shown below is: a) Chloropropylbromide b) 1-bromo-3-chloropropane c) Chlorobromopropane d) 1,3-dichlorobromopropane

2 10. The correct name for the substance to the right is: a) 2-benzene-3-dichloro-1-fluoro-4-nonene b) 2-benzene-3,3-dichloro-1-fluoro-4-nonene c) 2-phenyl-3-dichloro-1-fluoro-4-nonene d) 3,3-dichloro-1-fluoro-2-phenyl-4-nonene 11. The name for the substance represented by the formula to the right is: a) Paradibromobenzene b) 1,4 dibromocyclohexane c) Orthodibromobenzene d) Metadibromocyclohexane 12. The name of this structure is: a) 3,4 dibutyl-1-methylbenzene b) 1-methyl-3,4-dibutylbenzene c) 4-methyl-1,2-dipropylbenzene d) 4-ethyl-1,2-dipropylbenzene 13. Give the correct name for the structure represented on the right. a) 4-methyl-5-ethyl-2-hexene b) 4-methyl-5-ethyl-2-hexyne c) 2-ethyl-3-methyl-4-hexyne d) 4,5-dimethyl-2-heptyne 14. In the equation 2C2H6 + 7O2 6H2O + 4CO2 the number 7 is called a(n): a) Coefficient b) Exponent c) Subscript d) Superscript 15. When the equation Fe + Cl2 FeCl3 is balanced using the smallest whole-number coefficients, what is the coefficient of Cl2? a) 1 c) 3 b) 2 d) In the balanced equation 2Na + 2H2O H2 + 2X, the compound represented by the letter X is: a) NaOH b) NaH2 c) Na2O2 d) Na2O 17. To which category does the following reaction belong? BaCl2 + Br2(aq) BaBr2 + Cl2(aq) a) Single replacement c) Double replacement b) Synthesis d) Analysis 18. To which category does the following reaction belong? 2NH4OH + CaCl2 2NH4Cl + Ca(OH)2 a) decomposition b) Synthesis c) Single replacement d) Double replacement 19. Which is the best description of Mg(OH)2(aq)? a) Magnesium Hydroxide molecules dissolved in water b) Magnesium ions and Hydroxide ions dissolved in water c) Magnesium atoms and Hydroxide atoms dissolved in water d) Magnesium Hydroxide crystallized from water solution

3 20. Which statement described what happens when AgNO3(aq) is mixed with KI(aq) according to the equation representing the reaction? a) Hydrated potassium ions are formed. b) A precipitate of AgI is formed. c) Silver is present as a spectator ion. d) Soluble I2 molecules are formed. 21. Sodium hydroxide and aluminum nitrate are ionic solids that dissolve readily in water. When water solutions of these two compounds are mixed, a chemical reaction takes place in which the products are a hydroxide that is not soluble in water and a nitrate that is soluble. The correct equation for this reaction is: a) 3NaOH(l) + Al(NO3)3(l) Al(OH)3(s) + 3NaNO3(aq) b) 3Na + (aq) + 3NO3 - (aq) 3NaNO3(aq) c) 3NaOH(aq) + Al(NO3)3(aq) Al(OH)3(s) + 3NaNO3(aq) d) Na + (aq) + NO3 - (s) NaNO3(aq) 22. Given the following equation for the reaction between water solutions of barium chloride and ammonium sulfate: BaCl2(aq) + (NH4)2SO4(aq) BaSO4(s) + 2NH4Cl(aq) Which of the following is the correct net ionic equation for this reaction? a) Ba 2+ (aq) + SO4 2- (aq) BaSO4(s) b) Cl - (aq) + NH4 + (aq) NH4Cl(aq) c) Ba + (aq) + SO4 2- (aq) BaSO4(s) d) Ba + (aq) + NH4 + (aq) NH4 + (aq) + SO4 2- (aq) Ba + (s) + SO4 2- (s) + Cl - (aq) + NH4 + (aq) 23. What is the minimum number of moles of O2(g) needed to produce 1.0 mole of CO2 according to the reaction whose balanced equation is: 2CO(g) + O2(g) 2CO2(g) a) 2.0 moles c) 0.50 moles b) 1.0 mole d) 0.25 moles 24. What is the number of molecules in a system that contains 1.0 mole of NH3? a) 1.0 b) 2.40 x c) 6.02 x d) Methane burns in oxygen according to the equation: CH4(g) + 2O2(g) CO2(g) + 2H2O(g) A mixture containing 24.0 g of CH4 and 128 g of O2 is ignited. What mass of CO2 is produced? a) 116 g c) 66.0 g b) 104 g d) 152 g 26. When 2.0 moles of aluminum reacts completely with 3.0 moles of chlorine gas to form aluminum chloride, the total mass of the substances in the system: a) Remains the same b) Increases d) Increases at the start of the reaction and then decreases at the reaction end 27. On the average, the pressure of the atmosphere at sea level can support a column of mercury whose length is: a) 14.7 meters c) 22.4 meters b) 760 millimeters d) 100 kilopascals

4 28. As the pressure inside a pressure cooker is raised from mm Hg to mm Hg, the boiling point of the water inside the cooker: a) Increases b) Remains the same d) Increases and then decreases over time 29. As temperature increases, the number of molecules of water vapour in the air above a sample of water in a closed container a) Remains the same b) Increases d) Increases and then decreases over time 30. A sample of water is boiling in an open vessel at C. As the atmospheric pressure decreases, the temperature at which the water will boil: a) Remains the same b) Increases d) Varies from liquid to liquid, increases in some while decreases in others 31. The dissolved substance in a solution is called the a) Solute b) Solvent c) Tincture d) Hydrate 32. In a solution, the substance in which another substance is dissolved is called the a) Mixture b) Solvent c) Solute d) Hydrate 33. An alloy is an example of a a) Liquid solution b) Gaseous solution c) Miscible solution d) Solid solution 34. Ionic solids will dissolve to the greatest extent in liquid solvents that are: a) Polar b) Non polar c) Amalgams d) Hydrated 35. When the rate of dissolving of a substance is greater than the rate at which the substance is crystallizing out of solution, the solution is said to be: a) Saturated c) Unsaturated b) Concentrated d) Supersaturated 36. Substances whose water solutions conduct electricity are: a) Volatile b) Electrovalent c) Colligate d) Electrolytes 37. Increasing the temperature of a liquid generally causes the solubility of a solid in a liquid to: a) Decreases b) Increase c) Remain the same d) Increases and then decrease over time

5 38. Which of the following statements about an evaporating liquid are true? a) The molecules that evaporate first have a higher kinetic energy causing the temperature of the liquid to increase once they leave. b) The molecules that evaporate first have a lower kinetic energy, causing the temperature of the liquid to decrease once they leave. c) The molecules that evaporate first have an average kinetic energy, causing the temperature of the liquid to remain the same once they leave. d) The molecules that evaporate first have a higher kinetic energy, causing the temperature of the liquid to decrease once they leave. 39. Which equation illustrates sublimation? a) (NH4)2CO3(s) 2NH3(g) + CO2(g) + H2O(g) b) Ca 2+ (aq) + CO3 2- (aq) CaCO3(aq) c) H2O(s) H2O(l) d) CO2(s) CO2(g) 40. Which statement best accounts for the fact that gases can be greatly compressed? a) Molecules occupy space b) The collisions of the molecules are elastic c) Molecules of a given gas are identical d) Molecules of gases are relatively far from each other mmhg is equal to: a) 105 kpa b) atm c) 97.8 kpa d) 1.04 atm 42. The pressure of a gas will? when the volume is decreased and will? when the absolute temperature is decreased. a) increase...increase b) increase...decrease c) decrease...increase d) decrease...decrease. 43. If the absolute temperature of a gas is doubled and the pressure of the gas is halved, how will the volume change? a) It will increase by two times its original value. b) It will decrease to one fourth of its original value. c) It will stay the same as its original value. d) It will increase by four times its original value. 44. Standard temperature and pressure (STP) refers to which conditions? a) 0 o C and 1 KPa b) 0 K and 1 KPa c) 0 K and 1 atm d) 273 K and 1 atm 45. A 4.0 L sample of hydrogen gas at 700 mm Hg would occupy what volume at 250 mm Hg? (Assume temperature and number of particles stays constant.) a) 1.4 x 10-7 L b) 1.4 L c) 11.2 L d) 2.4 L

6 46. A balloon containing 2.50 L of gas at 1 atm would be what volume at a pressure of 300 KPa? (Assume temperature and number of particles stays constant.) a) 8.11 L b) L c) 120. L d) L 47. Which of the following equations correctly combines Boyle's and Charles' Laws? a) c) b) d) 48. Under conditions of fixed temperature and amount of gas, Boyle's law requires that I. P1V1 = P2V2 II. PV = constant III. P1/P2 = V2/V1 a) I only b) l, II only c) II, III only d) I, II, and III 49. A container with volume 71.9 ml contains water vapor at a pressure of 10.4 atm and a temperature of 465 o C. How many grams of the gas are in the container? a) g c) g b) g d) g 50. At which of the following temperatures will a gas diffuse through a room most rapidly? a) 30 o C c) 10 o C b) 20 o C d) 0 o C 51. Which of the following is not a basic assumption of the Kinetic Theory? a) Gases consist of molecules in constant motion in straight-line paths. b) The temperature of gas is proportional to the average kinetic energy of the molecules. c) The collisions between gas molecules and with the walls of the container are perfectly elastic. d) Since the collisions of molecules are perfectly elastic there is a strong attractive force between molecules in the gaseous state. 52. Which mathematical expressions below shows the Charles s law relationship? a) V α 1/P c) V α T b) T α P d) V α n 53. Which of the following expresses the relationship of variables is Gay Lussac s Law? a) As T increases, V increases c) As P decreases, V increases b) As T decreases, P decreases d) As T decreases, P increases