1 What are the missing coefficients for the skeleton equation below? Al2(SO4)3(aq) + KOH(aq) → Al(OH)3(aq) + K2SO4(aq)

A 1,3,2,3

B 2,12,4,6C 4,6,2,3D 1,6,2,3

E 2,3,1,1

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2 What are the missing coefficients for the skeleton equation below? Cr(s) + Fe(NO3)2(aq) → Fe(s) + Cr(NO3)3(aq)

A 4,6,6,2

B 2,3,2,3C 2,3,3,2D 1,3,3,1

E 2,3,1,2

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3 What are the missing coefficients for the skeleton equation below?

NH3 (g) + O2(g) → N2(g) + H2O(l)

A 4,3,2,6

B 2,1,2,3C 1,3,1,3D 2,3,2,3

E 3,4,6,2

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4 If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for iodine be? bromine + potassium iodide potassium bromide + iodine

A 2I-

B IC 2ID I2E 2I2

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5 If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for fluorine be? nitrogen trifluoride → nitrogen + fluorine

A 3FB 6F2

C F3

D 6FE 3F2

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6 What are the missing coefficients for the skeleton equation below?

AlCl3 + NaOH → Al(OH)3 + NaCl

A 1,3,1,3

B 3,1,3,1C 1,1,1,3D 1,3,3,1

E 3,1,1,1

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7 What are the missing coefficients for the skeleton equation below?

N2 + H2 → NH3

A 1,1,2

B 1,3,3C 3,1,2D 1,3,2

E 2,6,6

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8 Aluminum chloride and bubbles of hydrogen gas are produced when metallic aluminum is placed in hydrochloric acid. What is the balanced equation for this reaction?

A H + AlCl → Al + HCl

B 2Al + 6HCl → 2AlCl3 + 3H2

C Al + HCl3 → AlCl3 + H

D Al + 2HCl → AlCl2 + H2

E H2 + AlCl3 → Al + 2HCl

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9 What does the symbol in a chemical equation mean?

A heat is supplied to the reactionB a catalyst is neededC yieldsD precipitate

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10 When the equation, Fe + Cl2 → FeCl3, is balanced, what is the coefficient for Cl2?

A 1

B 2C 3D 4

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11 When the following equation is balanced, what is the coefficient for HCl?

Mg(s) + HCl(aq) → MgCl2 (aq) + H2(g)

A 6

B 3C 1D 2

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12 Chemical reactions _____.

A occur only in living organisms

B create and destroy atomsC only occur outside living organismsD produce new substances

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13 Which of the following is NOT a true statement concerning what happens in all chemical reactions?

A The ways in which atoms are joined together are changed.

B New atoms are formed as products.C The starting materials are named reactants.

D The bonds of the reactants are broken and new bonds of the products are formed.

EIn a word equation representing a chemical reaction, the reactants are written on the left and the products on the right.

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14 Chemical equations _____.

A describe chemical reactionsB show how to write chemical formulasC give directions for naming chemical compoundsD describe only biological changes

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15 A skeleton equation does NOT show which of the following?

A the correct formulas of the reactants and products

B the reactants on the left, the products on the right

C an arrow connecting the reactants to the products

D the physical states of the substances

E the relative amounts of reactants and products

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16 Chemical equations describe _____.

A nuclear reactionsB electrochemical processesC chemical reactionsD biological reactions

E all of the above

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17 Chemical equations must be balanced to satisfy the _____.

A law of definite proportions

B law of multiple proportionsC law of conservation of massD principle of Avogadro

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18 Symbols used in equations, together with the explanations of the symbols, are shown below. Which set is correct?

A (g), grams

B (l), litersC (aq), dissolved in waterD (sp), solid productE (lq), liquid

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19 In the chemical equation, H2O2(aq) → H2O(l) + O2(g), the H2O2 is a _____.

A product

B reactantC catalystD solidE gas

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20 A catalyst is _____.

A the product of a reaction

B a reactantC one of the reactants in single-replacement reactions

D a solid product of a reaction

E a chemical that speeds up the reaction

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21 When the following equation is balanced, KClO3 (s) → KCl(s) + O2(g), the coefficient of KClO3 is _____.

A 1

B 2C 3D 4

E 6

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22 Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide?

A P(s) + O2(g) → PO2(g)

B P(s) + O(g) → P2O5 (g)C P(s) + O2 (g) → P2O5(g)D P2O5 → P2(s) + O2 (g)

E P2(s) + O5(g) → P2O5 (g)

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23 In every balanced chemical equation, each side of the equation has the same number of _____.

A atoms

B moleculesC molesD coefficientsE subscripts

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24 When potassium hydroxide and barium chloride react, potassium chloride and barium hydroxide are formed. The balanced equation for this reaction is _____.

A KH + BaCl → KCl + BaHB KOH + BaCl → KCl + BaOHC 2KOH + BaCl2 → 2KCl + Ba(OH)2

D KOH + BaCl2 → K+ BaOHE 2KOH + 2BaCl2 → 2KCl2 + 2Ba(OH)2

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25 The double arrow symbol indicates _____.

A that heat must be applied

B an incomplete combustion reactionC that a gas is formed by the reactionD that the reaction is reversible

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26 If a combination reaction takes place between potassium and chlorine, what is the product?

A KClB KCl2C K2ClD PClE PCl2

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27 The product of a combination reaction is Ba(OH)2. If one reactant was H2O what was the other reactant?

A Ba2OB BaOC BaHD BaO2

E Ba2O7

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28 Write a balanced equation for the combination reaction that takes place when iron(III) oxide is formed from its constituent elements.

A Fe2 + O3 → Fe2O3

B 2Fe + 3O → Fe2O3

C 4Fe + 3O2 → 2Fe2O3

D 3Fe + O → Fe3OE Fe + O3 → FeO3

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29 The reaction, 2Fe + 3Cl2 → 2FeCl3, is an example of which type of reaction?

A combustion reaction

B single-replacement reactionC combination reactionD decomposition reaction

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30 Write a balanced equation to represent the decomposition of lead(IV) oxide.

A PbO2 → Pb + 2OB PbO2 → Pb + O2

C Pb2O → 2Pb + OD PbO → Pb + O2

E 2PbO → 2Pb + O2

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31 What is the balanced equation for the reaction that takes place between bromine and sodium iodide?

A Br2 + NaI → NaBr2 + I

B Br2 + 2NaI → 2NaBr + I2C Br2 + 2NaI → 2NaBr + 2I-

D Br + NaI2 → NaBrI2E Br + NaI2 → NaBr + I2

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32 The equation Mg(s) + 2HCl(aq) → MgCl2(aq) + H2 is an example of which type of reaction?

A combinationB single-replacementC decompositionD double-replacement

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33 What are the correct formulas and coefficients for the products of this double-replacement reaction? RbOH + H3PO4 →

A Rb(PO4)3 + H2O

B RbPO4 + 2H2OC Rb3PO4 + 3H2OD H3Rb + PO4OHE 3RbH + H2OPO4

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34 The equation H3PO4+ 3KOH → K3PO4+ 3H2O is an example of which type of reaction?

A double-replacement

B combinationC decompositionD single-replacement

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35 When the equation for the complete combustion of ethanol, C2H5OH, is balanced, what is the coefficient for oxygen?

A 1

B 3C 6D 7

E 14

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36 The equation 2C3H7OH + 9O2 → 6CO2 + 8H2O is an example of which type of reaction?

A combustion

B single-replacementC double-replacementD decomposition

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37 Which of the following is NOT true concerning the decomposition of a simple binary compound?

A The products are unpredictable.

B The products are the constituent elements.C The reactant is a single substance.

D The reactant could be an ionic or a molecular compound.

E Energy is usually required.

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38 Which of the following statements is true concerning single-replacement reactions?

A They are restricted to metals.

B They involve a single product.C They involve a single reactant.D Any metal replaces any other metal.E They are also called displacement reactions.

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39 In order to predict whether or not a single-replacement reaction takes place, we need to consult a chart which shows the _____.

A periodic tableB activity series of metalsC common polyatomic ionsD ionic charges of representative elements

E formulas and names of common metal ions having an ionic charge greater than 1.

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40 In the activity series of metals, which metal(s) will displace hydrogen from an acid?

A any metal

B only metals above hydrogenC only metals below hydrogenD only metals from Li to Na

E only gold

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41 Which of the following reactions will NOT take place spontaneously in the direction written?

A Cu + HCl →B Ca + Pb(NO3)2 →C Ag + AuCl3 →D Zn + HNO3 →

E K + H2SO4 →

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42 Use the activity series to write a balanced chemical equation for the following single replacement reaction:

Ag(s) + KNO3(aq) →

A Ag(s) + KNO3(aq) → AgNO3 + K

B Ag(s) + KNO3(aq) → AgK + NO3

C Ag(s) + KNO3(aq) → AgKNO3

D Ag(s) + KNO3(aq) → Ag + K + NO3

E No reaction takes place because silver is less reactive than potassium.

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43 In order for the reaction 2Al + 6HCl → 2AlCl3 + 3H2 to occur, which of the following must be true?

A Al must be above Cl on the activity series.

B Al must be above H on the activity series.C Heat must be supplied for the reaction.D A gas must be formed.

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44 Which of the following statements is NOT true concerning double-replacement reactions?

A The product may precipitate from solution.B The product may be a gas.C The product may be a molecular compound.D The reactant may be a solid metal.

E The reactant may be a binary ionic compound.

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45 A double-replacement reaction takes place when aqueous cobalt(III) chloride reacts with aqueous lithium hydroxide. One of the products of this reaction would be _____. A Co(OH)3

B Co(OH)2

C LiCO3

D LiCl3E Cl3OH

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46 What is the driving force in the following reaction? Ni(NO3)2(aq) + K2S(aq) → NiS + 2KNO3(aq)

A A gas is formed.

B A precipitate is formed.C Ionic compounds are reactants.D Ionic compounds are products.E Heat is required.

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47 In a double-replacement reaction _____.

A the reactants are usually a metal and a nonmetalB one of the reactants is often water

C the reactants are generally two ionic compounds in aqueous solution

D energy in the form of heat or light is often produced

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48 A double-replacement reaction takes place when aqueous Na2CO3 reacts with aqueous Sn(NO3)2. You would expect one of the products of this reaction to be _____.

A NaNO3

B NaSnC Sn(CO3)2

D CNO3

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49 In a combustion reaction, one of the reactants is _____.

A hydrogen

B nitrogenC oxygenD a metalE a binary ionic compound

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50 The products of a combustion reaction do NOT include _____.

A waterB carbon dioxideC carbon monoxideD heat

E hydrogen

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51 The complete combustion of which of the following substances produces carbon dioxide and water?

A C8H18

B K2CO3

C CaHCO3

D NOE H2S

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52 Which of the following is the correctly balanced equation for the incomplete combustion of heptene, C7H14?

A C7H14+ 14O → 7CO + 7H2O

B C7H14 + 7O2 → 7CO + 7H2OC 2C7H14 + 21O2 → 14CO2 + 14H2OD C7H14 + O2 → C7O2 + 7H2

E C7H14 + 7O2 → 7CO2 + 7H2O

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53 The type of reaction that takes place when one element reacts with a compound to form a new compound and a different element is a _____.

A combination reaction

B decomposition reactionC single-replacement reactionD double-replacement reactionE combustion reaction

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54 In a double-replacement reaction, _____.

A the products are always molecularB the reactants are two ionic compoundsC the reactant is always oxygenD the reactants are two elements

E the products are a new element and a new compound

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55 Which of the following statements is incorrect?

A The only way to determine the products of a reaction is to carry out the reaction.

B All chemical reactions can be classified as one of five general types.

C Complete combustion occurred when all the carbon in the product is in the form of carbon dioxide.

D A single reactant is the identifying characteristic of a decomposition reaction.

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56 What are the spectator ions in the reaction between KOH (aq) and HNO3 (aq)?

A K+ and H+

B H+ and OH-

C K+ and NO3-

D H+ andNO3-

E OH- only

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57 The net ionic equation for the reaction between aqueous solutions of HF and KOH is __________.

A HF + KOH → H2O + K+ + F-

B HF + OH- → H2O + F-

C HF + K+ + OH- → H2O + KFD H+ + OH- → H2O

E H+ + F- + K+ + OH- → H2O + K+ + F-

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58 Combining aqueous solutions of BaI2 and Na2SO4 affords a precipitate of BaSO4. Which ion(s) is/are spectator ions in the reaction?

A Ba2+ only

B Na+ onlyC Ba2+ and SO4

2-

D Na+ and I-

E SO42- and I-

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59 Which ion(s) is/are spectator ions in the formation of a precipitate of AgCl via combining aqueous solutions of CoCl2 and AgNO3?

A Co2+ and NO3-

B NO3- and Cl-

C Co2+ and Ag+

D Cl-

E NO3-

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60 The balanced net ionic equation for precipitation of CaCO3 when aqueous solutions of Na2CO3 and and CaCl2 are mixed is __________.

A 2Na+(aq) + CO32-(aq) → Na2CO3(aq)

B 2Na+(aq) + 2Cl-(aq) → 2NaCl(aq)C Na+(aq) + Cl-(aq) → NaCl(aq)D Ca2+(aq) + CO3

2-(aq) → CaCO3(s)

E Na2CO3(aq) + CaCl2(aq) → 2NaCl(aq) + CaCO3(s)

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61 When aqueous solutions of AgNO3 and KI are mixed, AgI precipitates. The balanced net ionic equation is:

A Ag+(aq) + I-(aq) → AgI(s)B Ag+(aq) + NO3

-(aq) → AgNO3(s)C Ag+(aq) + NO3

-(aq) → AgNO3(aq)D AgNO3(aq) + KI(aq) → AgI(s) + KNO3(aq)E AgNO3(aq) + KI(aq) → AgI(aq) + KNO3(s)

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62 When H2SO4 is neutralized by NaOH in aqueous solution, the net ionic equation is __________.

A SO42-(aq) + 2Na+(aq) → Na2SO4(aq)

B SO42-(aq) + 2Na+(aq) → Na2SO4(s)

C H+(aq) + OH-(aq) → H2O(l)D H2SO4(aq) + 2OH-(aq) → 2H2O(l) + SO4

2-(aq)

E 2H+(aq) + 2NaOH(aq) → 2H2O(l) + 2Na+(aq)

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