Ch 7 Chemical Reactions Study Guide Accelerated Chemistry SCANTRON

Ch 7 Chemical Reactions Study Guide Accelerated Chemistry SCANTRON Name /80 TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. Correct the False statments by changing the underlined word(s). 1) The following equation IS balanced: CH4 + 2O2 CO2 + H2O 1) 2) A strong electrolyte solution contains ionic compounds that completely dissociate in water. 2) 3) When compounds containing polyatomic ions dissolve, the polyatomic ions usually dissolve as intact units. 3) 4) A net ionic equation shows all ionic species that are present in solution. 4) 5) Combustion reactions emit heat and so can be classified as endothermic. 5) 6) Mixing HNO3 (aq) and NaHCO3 (aq) will produce carbon dioxide gas as a product. 6) 7) When balancing a chemical equation you may alter the coefficients but not the subscripts in the equation. 7) 8) An acidbase reaction always produces a salt plus carbon dioxide. 8) 9) The formation of either a solid or a gas is evidence of a chemical reaction. 9) 10) Decomposition reactions usually require energy to initiate the reaction. 10) 11) Li+, Na+, K+ and NH4 + compounds are soluble. 11) 12) The reaction of carbonate ion with magnesium ion to form solid magnesium carbonate is an example of an oxidation reduction reaction. 12) 13) Evidence of a redox reaction is when one substance transfers protons to another substance. 13) 14) The following equation IS balanced: 2 C4H10O + 13 O2 8 CO2 + 10 H2O 14) 15) The reaction of baking soda and vinegar to produce carbon dioxide gas is an example of a precipitation reaction. 15) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 16) A reaction which forms a gaseous product is an example of a(n). 16) A) oxidationreduction reaction B) combustion reaction C) gas evolution reaction D) precipitation reaction 1

17) A reaction which forms a solid product is an example of a(n). 17) A) gas evolution reaction B) combustion reaction C) oxidationreduction reaction D) precipitation reaction 18) A reaction in which a substance reacts with oxygen, emitting heat and forming oxygencontaining compounds is an example of a(n) A) gas evolution reaction. B) acidbase reaction. C) combustion reaction. D) precipitation reaction. 18) 19) Which of the following is NOT evidence that a chemical reaction has occurred? 19) A) solid formation when chemicals are contacted with each other B) emission of light when chemicals are contact with each other C) gas formation when chemicals are contacted with each other D) All of the above are evidence of a chemical reaction. 20) Which of the following is NOT a sign of a chemical reaction? 20) A) absorbing heat when chemicals are contacted with each other B) emission of heat when chemicals are contacted with each other C) absorbing light when chemicals are contacted with each other D) emission of light when chemicals are contacted with each other 21) When water is heated, bubbles form in the water. Is this evidence of a chemical reaction? Why? A) No, boiling water is a physical change. B) No, the formation of gas bubbles is a secondary chemical reaction which is ignored. C) Yes, the formation of a gas is evidence of a chemical reaction. D) Yes, the formation of a gas is proof a new compound has been made. 21) 22) Which of the following statements about balancing reactions is FALSE? 22) A) Subscripts are multiplied by the coefficients to determine the number of atoms in a compound. B) If there is no coefficient or subscript, a one is implied. C) Coefficients are added to compounds to ensure both sides of the reaction have equal numbers of each atom. D) When coefficients are added the type of compounds is changed in the chemical reaction. 23) Before a chemical equation can be written, one must know 23) A) the number of moles of all reactants and products. B) the molar mass of all the compounds. C) the symbols and formulas of all reactants and products. D) none of the above. 24) When the equation, N 2 + H 2 NH 3 is balanced, the coefficient of hydrogen is: 24) A) 4 B) 1 C) 2 D) 3 25) When the equation, O 2 + C5H12 CO2 + H2O is balanced, the coefficient: of O2 is: A) 8 B) 5 C) 4 D) 3 25) 2

26) What are the coefficients for the following reaction when it is properly balanced? 26) HCl + Mg MgCl 2 + H 2 A) 1, 1, 1, 2 B) 2, 1, 1, 1 C) 2, 1, 2, 2 D) 1, 2, 1/2, 1 27) What are the coefficients for the following reaction when it is properly balanced? 27) O 2 + CH 4 CO 2 + H 2 O A) 2, 3, 2, 2 B) 1, 3, 2, 1 C) 2, 1, 1, 2 D) 2, 1, 3, 1 28) What are the coefficients for the following reaction when it is properly balanced? 28) Na 3 PO 4 + Ba(NO 3 ) 2 NaNO 3 + Ba 3 (PO 4 ) 2 A) 2, 3, 6, 1 B) 2, 1, 1, 3 C) 6, 1, 3, 2 D) 2, 3, 1, 6 29) What are the coefficients for the following reaction when it is properly balanced? 29) nitric acid + sodium hydroxide sodium nitrate + water A) 2, 1, 1, 1 B) 5, 2, 2, 1 C) 1, 1, 1, 1 D) 2, 3, 2, 2 30) What are the coefficients for the following reaction when it is properly balanced? 30) potassium iodide + lead (II) acetate lead (II) iodide + potassium acetate A) 3, 2, 2, 1 B) 1, 1, 2, 2 C) 2, 1, 1, 2 D) 2, 1, 1, 1 31) What are the coefficients for the following reaction when it is properly balanced? 31) nitrogen monoxide + carbon monoxide nitrogen + carbon dioxide A) 1, 1, 2, 2 B) 2, 2, 1, 2 C) 2, 1, 1, 2 D) 2, 2, 2, 1 32) When the equation Ca3N2 + H2O Ca(OH)2 + NH3 is balanced, the coefficient of H2O is: A) 3 B) 12 C) 6 D) 2 32) 33) When the equation NO2 + H2O + O2 HNO3 is balanced, the coefficient of HNO3 is A) 2. B) 4. C) 3. D) 5. 33) 3

34) Which of the following equations is NOT balanced properly? 34) A) Cr2(SO4)3 + 6KOH 2Cr(OH)3 + 3 K2SO4 B) 2NaHCO3 Na2CO3 + CO2 + H2O C) 4NH3 + 14O2 4NO2 + 6H2O D) 2Cr + 6HCl 2CrCl3 + 3H2 35) Sodium metal reacts with water to form aqueous sodium hydroxide and hydrogen gas. Which equation below best describes the balanced equation for this reaction? A) 2Na + 2H2O 2NaOH (aq) + H2 (g) B) Na + H2O NaOH (aq) + H (g) C) Na + H2O NaOH (aq) + H2 (g) D) 2Na + H2O Na2OH (aq) + H (g) 35) 36) An aqueous solution is: 36) A) water with another compound dissolved in it. B) water with a molecular compound dissolved in it. C) an ionic compound with water dissolved in it. D) any liquid with another compound dissolved in it. 37) Which of the following compounds is INSOLUBLE? 37) A) lithium carbonate B) aluminum sulfide C) magnesium bromide D) potassium acetate 38) Which of the following compounds is INSOLUBLE? 38) A) magnesium sulfate B) magnesium nitrate C) magnesium phosphate D) magnesium iodide 39) Which of the following compounds is SOLUBLE? 39) A) copper carbonate B) calcium carbonate C) strontium carbonate D) potassium carbonate 40) Which of the following compounds is SOLUBLE? 40) A) aluminum sulfate B) aluminum sulfide C) aluminum carbonate D) none of the above 41) All of the following compounds are soluble in water EXCEPT 41) A) CaCl 2. B) PbCl 2. C) FeCl 3. D) NH 4 Cl. 42) The compound sodium sulfate is soluble in water. When this compound dissolves in water, which ion listed below would be present in solution? A) S2 B) O2 C) SO4 2 D) Na2 2+ 42) 43) When solid NaCl is stirred into water, which of the following is NOT true? 43) A) The solution will conduct electricity. B) The solution will taste salty. C) The NaCl will fail to dissociate. D) none of the above 44) If you had an aqueous mixture that contained Ag+, K+, and Pb+2 cations, how many different solids could precipitate if a chloride solution was added? A) 1 B) 2 C) 4 D) 3 44) 4

45) In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products? A) (l) B) (w) C) (g) D) (s) 45) 46) What type of a reaction occurs when a potassium nitrate solution is mixed with a barium acetate solution? A) precipitation B) oxidationreduction C) gas evolution D) no reaction 46) 47) A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of A) potassium chloride. B) iron(iii) chloride. C) magnesium chloride. D) barium chloride. 47) 48) What would be the formula of the precipitate that forms when Pb(NO3)2 (aq) and K2SO4 (aq) are mixed? A) PbSO4 B) K(NO3)2 C) PbK2 D) none of the above 48) 49) Considering the following precipitation reaction: 49) Which compound would not form ions in the complete ionic equation? A) Pb(NO 3 ) 2 B) PbI 2 C) KNO 3 D) KI 50) Considering the following precipitation reaction: 50) Which ion would NOT be present in the complete ionic equation? A) NO 3 B) Pb2+ C) I, K+ D) All the above ions are in the complete ionic equation. 51) Considering the following precipitation reaction: 51) Which ion(s) would NOT be present in the net ionic equation? A) K+, NO 3 B) K+, Pb2+ C) K+, I D) Pb2+, NO 3 5

52) Considering the following precipitation reaction: 52) Which ion(s) would NOT be spectator ions? A) Pb2+, I B) Pb2+, NO 3 C) NO3, Pb2+ D) K+, I 53) Considering the following precipitation reaction: 53) What is the correct complete ionic equation? A) Pb2+ + 2NO 3 + 2K+ + 2I PbI 2 (s) + 2K+ + 2NO 3 B) Pb2+ + 2NO 3 + 2K+ + 2I Pb2+ + 2I + 2K+ + 2NO 3 C) Pb2+ + 2NO 3 +2K+ + I PbI 2 (s) + 2K+ + NO 3 D) Pb2+ + (NO 3 ) 2 + 2K+ + 2I PbI 2 (s) + 2K+ + 2NO 3 54) Considering the following precipitation reaction: 54) What is the correct net ionic equation? A) 2NO3 + 2K+ 2KNO 3 B) Pb2+ + 2NO3 + 2K+ + 2I PbI 2 (s) + 2K+ + 2NO 3 C) Pb2+ + 2I PbI 2 (s) D) Pb2+ + I 2 PbI 2 (s) 55) Which of the following statements about writing molecular, complete and net ionic equations is FALSE? A) A net ionic equation is an equation showing only the species that actually change during the reaction. B) A spectator ion remains unchanged in the reaction and appears on both sides of the equation. C) A complete ionic equation is a chemical equation showing all of the species as they are actually present in solution. D) All of the statements are true. 55) 56) Which is a spectator ion from the following complete ionic equation: Ag+(aq) + NO3 (aq) + K+ (aq) + Br(aq) AgBr(s) + K+(aq) + NO3 (aq) A) K+ B) AgBr C) Br D) Ag+ 56) 57) Which of the following everyday substances does NOT typically contain an acid? 57) A) lemons B) limes C) vinegar D) soap 6

58) What type of a reaction occurs when a silver nitrate solution is mixed with sodium chloride solution? A) gas evolution B) oxidationreduction C) acidbase neutralization D) precipitation 58) 59) What type of a reaction occurs when a sodium hydroxide solution is mixed with an acetic acid solution? A) oxidationreduction B) acidbase neutralization C) gas evolution D) precipitation 59) 60) What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide? 60) A) HCl + KOH H 2 O + KCl B) 2H+ +2Cl + K2+ + 2OH H 2 O + K2+ +2 Cl C) H+ + Cl + K+ + OH H 2 O + K+ + Cl D) H+ + OH H 2 O 61) What is the molecular equation for the reaction of hydrochloric acid with potassium hydroxide? A) 2HCl + K(OH) 2 2H 2 O + KCl 2 B) H+ + OH H2O C) HCl + KOH H 2 O + KCl D) H 2 Cl + 2KOH H 2 O +2KCl 61) 62) What is the complete ionic equation for the reaction of hydrochloric acid with potassium hydroxide? A) H+ + OH H2O B) 2H+ +2Cl + K2+ + 2OH H 2 O + K2+ +2 Cl C) H+ + Cl + K+ + OH H 2 O + K+ + Cl D) H+ + Cl + K+ + OH 2H+ + O2 + K+ + Cl 62) 63) When a solution of MgCl 2 and one of AgNO 3 are mixed, the net ionic equation is: 63) A) Mg2+(aq) + 2NO 3 (aq) Mg(NO 3 ) 2 (aq) B) Mg2+(aq) + 2Cl(aq) + 2Ag+(aq) + 2NO 3 (aq) Mg(NO 3 ) 2 (aq) + 2 AgCl(s) C) Cl(aq) + Ag+(aq) AgCl(s) D) Mg2+(aq) + 2Cl(aq) + 2Ag+(aq) + 2NO 3 (aq) Mg2+(aq) + 2NO 3 aq) + 2AgCl(s) 64) Which of the following types of compounds will NOT undergo a gas evolution reaction when acid is added? A) sulfides B) hydroxides C) bisulfites D) carbonates 64) 65) What is the gas produced when hydrochloric acid is reacted with ammonium carbonate? 65) A) chlorine B) hydrogen C) carbon dioxide D) ammonia 66) What type of a reaction occurs when a hydrochloric acid solution is mixed with a sodium bicarbonate solution? A) gas evolution B) acidbase neutralization C) oxidationreduction D) precipitation 66) 7

67) Which of the following would NOT be a product from mixing hydrochloric acid with a solution of sodium sulfite? A) SO2 (g) B) H2 (g) C) NaCl (aq) D) H2O (l) 67) 68) What type of a reaction occurs when potassium metal reacts with fluorine gas? 68) A) acidbase neutralization B) precipitation C) gas evolution D) oxidationreduction 69) Identify the oxidationreduction reactions among the following: 1. Zn(s) + Cu2+(aq) Zn2+(aq) + Cu(s) 2. 2 Na(s) + Cl 2 (aq) 2NaCl(s) 3. 2 Mg(s) + O 2 (g) 2 MgO A) 1 and 2 only B) 2 and 3 only C) 1 and 3 only D) All of 1, 2, and 3 69) 70) Methane gas (CH 4 ), on complete combustion in air, produces: 1. CO 2 2. H 2 3. H 2 O A) 1 and 3 only B) 1 and 2 only C) 2 and 3 only D) All of 1 and 2 only 70) 71) A redox reaction has occurred. 71) A) when a substance reacts with elemental oxygen B) when one substance forms a solid C) when an alkali metal reacts with an alkaline earth metal D) when one substance transfers protons to another 72) Which of the following statements about redox reactions is FALSE? 72) A) Oxidation is the loss of electrons. B) A reaction can result in either oxidation or reduction, not both. C) Reduction is the gain of electrons. D) A reaction involving elemental oxygen is a redox reaction. 73) The reaction CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O (g) is 73) A) a redox reaction. B) an exothermic reaction. C) a combustion reaction. D) all of the above 74) What type of reaction is the generic equation A + B AB? 74) A) single displacement B) synthesis/combination C) decomposition D) doubledisplacement 75) What type of reaction is the generic equation A + BC AC + B? 75) A) decomposition B) doubledisplacement C) synthesis/combination D) single displacement 8

76) What type of reaction is the generic equation AB + CD AD + CB? 76) A) decomposition B) synthesis/combination C) single displacement D) doubledisplacement 77) What type of reaction is the generic equation AB A + B? 77) A) doubledisplacement B) decomposition C) synthesis/combination D) single displacement 78) What must be supplied for most decomposition reactions to happen? 78) A) heat B) energy C) electrical current D) any of the above 79) Identify the double displacement reactions among the following: 1. KCl(aq) + AgNO 3 (aq) AgCl(s) + KNO 3 (aq) 2. Na 2 SO 4( aq) + BaCl 2 (aq) BaSO4(s) + 2NaCl(aq) 79) 3. H 2 SO 4( (aq) + 2NaOH(aq) Na 2 SO 4( (aq) + 2H 2 O(l) A) 2 and 3 only B) 1 and 2 only C) 1 and 3 only D) All of 1, 2, and 3 80) Which statement about ozone is TRUE? 80) A) Chlorofluorocarbons deplete the ozone layer. B) Ozone protects life on Earth from harmful ultraviolet light. C) Ozone normally forms in the upper atmosphere. D) All the of the three statements are true. 9