Review Topic 6: Chemical Equations, Reaction Types, and Electrochemistry

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1 Name: Score: 28 / 28 points (100%) Review Topic 6: Chemical Equations, Reaction Types, and Electrochemistry Multiple Choice Identify the choice that best completes the statement or answers the question. C 1. Which is an example of a synthesis reaction? a. HCl + KOH KCl + H 2 O c. C + O 2 CO 2 b. Pb(NO 3 ) 2 + 2HBr PbBr 2 + 2HNO 3 d. Mg + H 2 SO 4 MgSO 4 + H 2 synthesis means coming together a neutralization b double replacement d single replacement D 2. What would be the product(s) of this reaction? 3MgO + 2 Al a. 2 Mg 3 Al 2 O 3 c. 6 Mg + Al 3 O 2 b. Mg 3 Al 2 + 3O 2 d. 3 Mg + Al 2 O 3 ANSWER: D This is looking for a single replacement reaction where the metal will replace the metal B 3. The reaction shown above is a. an endothermic reaction c. a decomposition reaction b. an exothermic reaction d. a double replacement reaction Heat is being given off (a product) B 4. Which of these completes this reaction? a. Oxygen c. Metal oxide b. Hydrogen d. Air The metal stays the same on both side (it would just be an ion on the right), file:///c:/users/joseph%20morris/desktop/sol%20review%20topics/review%20topic%206/review_topic_6_sg.htm 1/8

2 water is H 2 O, hydroxide is OH, which means hydrogen is missing C 5.? Al +? HCl? AlCl 3 +? H 2 Which set of coefficients will balance this equation? a. 1, 3, 1, 1 c. 2, 6, 2, 3 b. 2, 3, 2, 6 d. 3, 6, 3, 2 a. 1, 3, 1, 1 does not work (H s 3 to 2) b. 2, 3, 2, 6 does not work (H s 3 to 12) c. 2, 6, 2, 3 d. 3, 6, 3, 2 does not work (H s 6 to 4) C 6. Which of the following models a synthesis reaction? a. b. c. d. a single replacement b decomposition c synthesis d double replacement B 7. Which half reaction represents reduction? a. Cu 0 > Cu e c. Al 0 > Al e b. Ag e > Ag 0 d. Fe +2 > Fe e file:///c:/users/joseph%20morris/desktop/sol%20review%20topics/review%20topic%206/review_topic_6_sg.htm 2/8

3 Ag s number went from +1 to 0 reduction A 8. Which of the following best represents the reaction between hydrochloric acid and sodium hydroxide? a. HCl + NaOH > H 2 O + NaCl b. HCl 2 + 2Na(OH) 2 > 2H 2 O + 2NaCl + OH c. 2HCl + Na(OH) 2 > 2H 2 + Na + + Cl +O 2 d. 2HCl + 2NaOH > Na(OH) 2 + H 2 Cl 2 HCl hydrochloric acid NaOH sodium hydroxide acid + base makes water + salt B 9. Na 2 CO 3 + Ca(OH) 2 > 2NaOH + CaCO 3 What type of reaction is represented here? a. Single Replacement c. Synthesis b. Double Replacement d. Decomposition Na and Ca both switched places A 10. What type or reaction does this illustration represent? a. Decomposition c. Single Replacement b. Synthesis d. Double Replacement One molecule fell apart to two A 11. Fe + CuCl 2 > FeCl 2 + Cu The type of reaction represented by the above equation is a. single replacement c. synthesis b. double replacement d. decomposition Fe kicks Cu out so only one thing replaced C 12. Ca(OH) 2 + Al 2 (SO 4 ) 3 > CaSO 4 + Al(OH) 3 When the above equation is balanced, the coefficients in order are a. 1,1,1,1 c. 3,1,3,2 b. 2,1,1,2 d. 3,2,2,1 file:///c:/users/joseph%20morris/desktop/sol%20review%20topics/review%20topic%206/review_topic_6_sg.htm 3/8

4 a doesn t work (look at Al) b doesn t work (look at Ca) c works d doesn t work (look at Ca) A 13. 2O 3 (g) > 3 (g) Which completes the chemical equation above? a. O 2 c. ClO b. O 3 d. ClO 2 Only one that balances O without creating matter C 14. Which of the following equations is balanced? a. H 2 SO 4 + 2NaOH > Na 2 SO 4 + H 2 O b. CH 4 + Cl 2 > CH 2 Cl 2 + HCl c. H 2 O + MgO > Mg(OH) 2 d. Al(OH) 3 + H 3 PO 4 > AlPO 4 + 2H 2 O a doesn t work (not enough H s) b doesn t work (not enough H s) c works (2 H, 2O, and 1 Mg) d doesn t work (not enough Os) C 15. Zn + CuSO 4 > Cu + ZnSO 4 Which reaction type best describes the reaction above? a. Combination c. Single replacement b. Decomposition d. Combustion B 16. Zn kicks out Cu single replacement (Combination is another name for synthesis) AlCl 3 (aq) + Ba(OH) 2 (aq) > Al(OH) 3 (s) + BaCl 2 (aq) When this equation is correctly balanced, the coefficient of the AlCl 3 will be a. 1 c. 4 b. 2 d. 6 2 AlCl 3 (aq) + 3 Ba(OH) 2 (aq) > 2 Al(OH) 3 (s) + 3 BaCl 2 (aq) file:///c:/users/joseph%20morris/desktop/sol%20review%20topics/review%20topic%206/review_topic_6_sg.htm 4/8

5 B 17. Which of these reactions shows simple chemical decomposition? a. H 2 + I 2 > 2 HI c. NaF + HCl > HF + NaCl b. 2 NaCl > 2 Na + Cl 2 d. I NaCl > 2 NaI + Cl 2 D 18. a. H 2 + I 2 > 2 HI synthesis b. 2 NaCl > 2 Na + Cl 2 decomposition c. NaF + HCl > HF + NaCl double replacement d. I NaCl > 2 NaI + Cl 2 single replacement a. 1,1,1, c. 2,1,2 b. 1,1,2 d. 2,2,1 ANSWER: D Makes 4 H s and 2 O s on each side B 19. A balanced chemical equation has equal numbers of atoms of each type on both sides of the equation. This illustrates the principle of a. conservation of energy c. action and reaction b. conservation of mass d. natural selection We are keeping the mass the same D 20. In NHO 3, the oxidation state of hydrogen is +1 and the oxidation state of oxygen is 2. Therefore, the oxidation state of nitrogen is a. 1 c. +4 b. +3 d. +5 file:///c:/users/joseph%20morris/desktop/sol%20review%20topics/review%20topic%206/review_topic_6_sg.htm 5/8

6 ANSWER: D x + 1(+1) + 3( 2) = 0 x = +5 C 21. Which of the following substances is a weak electrolyte? a. b. c. d. file:///c:/users/joseph%20morris/desktop/sol%20review%20topics/review%20topic%206/review_topic_6_sg.htm 6/8

7 electrolyte will have bulb light, weak will be lit weakly B 22. What is the oxidation number of a fluoride ion? a. +1 c. 2 b. 1 d. +2 It is based on the location on the Periodic Table, ions from: Group 1 gets +1 Group 2 gets +2 Group 13 tends to be a +3 Group 15 tends to be a 3 Group 16 tends to be a 2 Group 17 tends to be a 1 Group 18 tends to be a 0 A 23. Which statement describes how plastics differ from nucleic acids? a. Plastics are synthetic polymers, but nucleic acids are natural polymers b. Plastics are formed from repeated subunits, but nucleic acids are not. c. Plastics are formed from organic compounds, but nucleic acids are not. d. Plastics are polymers, but nucleic acids are monomers. D 24. Both are polymers, which mean both are made up of small building blocks called monomers that are repeated over and over again. Polymers are man made (synthetic), while nucleic acid are naturally made in plants and animals 2Al(C 2 H 3 O 2 ) 3 + 3BaSO 4 Al 2 (SO 4 ) 3 + 3Ba(C 2 H 3 O 2 ) 2 Which type of chemical reaction does this equation represent? a. Synthesis c. Oxidation reduction b. Neutralization d. Double replacement ANSWER: D Not Synthesis This type of reaction results in the creation of 1 compound from many reactants Not Neutralization This type of reaction results in an acid (starts with H) and a base (ends with OH) making water (results from the H and OH combining) and a salt Not a Redox (Oxidation reduction) because all the oxidation numbers of the elements stay the same on the reactant and product side It is a double replacement Al and Ba switched the anion they are with. A 25. Al(s) + 3AgNO 3 (aq) Al(NO 3 ) 3 (aq) + 3Ag(s) This equation represents which type of chemical reaction? a. Single replacement c. Decomposition file:///c:/users/joseph%20morris/desktop/sol%20review%20topics/review%20topic%206/review_topic_6_sg.htm 7/8

8 C 26. B 27. b. Double replacement d. Synthesis Single replacement element + compound > element + compound Yes Double replacement compound + compound > compound + compound No Decomposition 1 substance breaks down to 2 or more No Synthesis 2 or more substance combine to make 1 No C 2 H 4 + _?_O 2 CO 2 + H 2 O How many moles of O 2 are in the chemical equation when balanced using the lowest whole numbers? a. 5 b. 4 c. 3 d. 2 When the equation is balanced, we would have the coefficients (and therefore relative moles) of: _1_ C 2 H 4 + _3_O 2 _2_CO 2 + _2_ H 2 O Ca(NO 3 ) 2 + _?_H 3 PO 4 Ca 3 (PO 4 ) 2 + HNO 3 When this equation is balanced, the coefficient in front of H 3 PO 4 is a. 1 b. 2 c. 3 d. 4 When the equation is balanced, we would have the coefficients of: _3_ Ca(NO 3 ) 2 + _2_H 3 PO 4 _1_Ca 3 (PO 4 ) 2 + _6_ HNO 3 Multiple Response Identify one or more choices that best complete the statement or answer the question. 28. Which of these are naturally occurring? a. nylon c. DNA e. polyester b. Teflon d. protein RESPONSE: C,D,D It needs to be able to be found and created in a living being. nylon, Teflon, and polyester are all synthetic and man made. file:///c:/users/joseph%20morris/desktop/sol%20review%20topics/review%20topic%206/review_topic_6_sg.htm 8/8