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1 Chemistry Test - Chapter 10 Chemical Equations Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. When balancing a chemical equation, insert coefficients to a. change the chemical compounds c. change the oxidation number of the atom b. correct a chemical formula d. satisfy the law of conservation of mass 2. A polymerization is a chemical reaction in which many simple molecules combine in chains to form one very large molecule. This would be classified as what kind of chemical reaction? a. combustion d. single displacement b. synthesis e. double displacement c. decomposition 3. Which is of the following is NOT a true statement concerning what happens in all chemical reactions? a. The ways in which atoms are c. The starting materials are named joined together are changed. reactants. b. New atoms are formed as products d. The bonds of the reactants are broken and new bonds of the products are formed. 4. Use the activity series given to you to determine which of the following reactions will NOT take place a. Zn + HNO 3 --> c. Ag + AuCl 3 --> b. Ca + Pb(NO 3 ) 2 --> d. Cu + HCl--> 5. Which of the following changes is NOT evidence of a chemical reaction? a. change of state c. odor change b. temperature change d. color change 6. In balancing a chemical equation, which of the following are you allowed to do? a. change subscripts c. change superscripts b. write/change coefficients d. add new subscripts

2 7. What type of reaction is indicated by the general form AB --> A + B 8. What type of reaction is indicated by the general form AB + C --> A + CB? 9. What type of reaction is indicated by the general form A + B --> AB? 10. What type of reaction is indicated by the general form AC + BD --> AD + BC? 11. When you heat magnesium in the presence of oxygen (in our air) in order to form magnesium oxide, what type of reaction is it? 12. A double replacement reaction is likely to occur when a. a metal, such as zinc, is placed in c. two ionic compounds are a concentrated acid dissolved in water b. a hydrocarbon is burned in the d. a compound breaks down into its presence of oxygen elemental components 13. Use this equation to answer the question:agno 3 + Cu --> Cu(NO 3 ) 2 + Ag What are the reactants in this chemical equation? a. AgNO 3 and Cu c. AgNO 3 and Cu(NO 3 ) 2 b. Cu(NO 3 ) 2 and Ag d. Cu and Ag 14. Use this equation to answer the question:agno 3 + Cu --> Cu(NO 3 ) 2 + Ag What are the products in this chemical equation? a. AgNO 3 and Cu c. AgNO 3 and Cu(NO 3 ) 2 b. Cu(NO 3 ) 2 and Ag d. Cu and Ag 15. Use this equation to answer the question:agno 3 + Cu --> Cu(NO 3 ) 2 + Ag What type of reaction is this?

3 16. Use this equation to answer the question: AgNO 3 + Cu --> Cu(NO 3 ) 2 + Ag On the right side of this equation, the copper ion has what charge? a. 0 d. +3 b. +1 e. -1 c Use this equation to answer the question:agno 3 + Cu --> Cu(NO 3 ) 2 + Ag Which of the following atoms in the equation is NOT currently balanced? a. Ag c. O b. Cu d. they are all balanced 18. Which type of reaction would have the products CO 2 and H 2 O? a. synthesis d. double replacement b. decomposition e. combustion c. single replacement Matching Matching: Some terms will be used more than once. a. product h. complete ionic equation b. reactant i. spectator ions c. chemical equation j. aqueous d. balanced equation k. activity series of metals e. skeleton equation l. chemical reaction f. Law of Conservation of Mass m. precipitate g. net ionic equation 19. Used by chemists as a shorthand way to represent chemical reactions. 20. A solid produced during a chemical reaction in a solution. 21. A starting substance in a chemical reaction. 22. An equation in which each side has the same number of atoms of each element. 23. A new substance formed in a chemical reaction. 24. Matter is neither created or destroyed.

4 25. A chemical equation that does not indicate relative amounts of reactants & products. (It's probably not balanced.) 26. Ionic equations that include only the particles that participate in the reaction. 27. Ions that do not participate in a reaction. 28. This is why we use coefficients to balance chemical equations. 29. A solution in which the solvent is water. 30. Ionic equations that show all of the particles in a solution as they really exist. 31. (aq) 32. Found on the right side of a chemical equation. 33. A list of metals in order of decreasing reactivity. 34. The process by which the atoms of one or more substances are rearranged to form different substances.

5 Chemical Reactions Review IDENTIFY THE TYPE OF REACTION AND BALANCE THE EQUATION: 1. Sb + I 2 SbI 3 2. Li + H 2 O LiOH + H 2 3. AlCl 3 Al + Cl 2 4. C 6 H 12 + O 2 CO 2 + H 2 O 5. AlCl 3 + Na 2 CO 3 Al 2 (CO 3 ) 3 + NaCl 6. HNO 3 + Ba(OH) 2 Ba(NO 3 ) 2 + H 2 O 7. Al + Pb(NO 3 ) 2 Al(NO 3 ) 3 + Pb IDENTIFY THE TYPE OF REACTION & WRITE A BALANCED EQUATION (INCL. STATES): 8. Aqueous solutions of ammonium chloride and lead(ii) nitrate produce lead(ii) chloride precipitate and aqueous ammonium nitrate. 9. Solid carbon disulfide burns in oxygen to yield carbon dioxide and sulfur dioxide gases. 10. Iron metal reacts with aqueous silver nitrate to produce aqueous iron(iii) nitrate and silver metal. 11. Solid potassium nitrate yields solid potassium nitrite and oxygen gas. 12. Calcium metal reacts with chlorine gas to produce solid calcium chloride. 13. Fluorine gas added to aqueous potassium chloride produces aqueous potassium fluoride and chlorine gas. 14. Phosphorous reacts with oxygen gas to produce solid diphosphorous pentoxide. IDENTIFY THE TYPE OF REACTION, PREDICT THE PRODUCTS (STATES are REQUIRED), AND BALANCE THE EQUATION: 15. Al(s) + NaOH(aq) 16. C 2 H 4 (g) + O 2 (g) 17. FeCl 2 (aq)+ K 2 S(aq) 18. Ba(s) + O 2 (g) 19. NH 4 NO 3 (aq) + NaCl(aq) 21. Magnesium metal is added to aqueous hydrochloric acid. 22. Potassium metal is combined with chlorine gas. 23. Aqueous solutions of potassium bromide and silver nitrate are combined. 20. SO 2 (g) 24. Solid mercury(ii) oxide breaks down into its component elements. CLASSIFY EACH REACTION AS EXOTHERMIC OR ENDOTHERMIC: 25. PCl 3 + Cl 2 PCl 5 + energy 26. P 4 O 10 P 4 + 5O Sb + 3I 2 + heat 2SbI CaO + H 2 O Ca(OH) 2 + heat 29. CaCO 3 + energy CaO + CO C 8 H O 2 16CO H 2 O + heat

6 Chemistry Test - Chapter 10 Chemical Equations Answer Section MULTIPLE CHOICE 1. D 2. B 3. B 4. D 5. A 6. B 7. B 8. D 9. A 10. C 11. A 12. C 13. A 14. B 15. D 16. C 17. C 18. E MATCHING 19. C 20. M 21. B 22. D 23. A 24. F 25. E 26. G 27. I 28. F 29. J 30. H 31. J 32. A 33. K 34. L

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