Name Date Period Accelerated Chemistry

Transcription

1 Assessment Chemical Equations and Reactions Section 8-1 Quiz: Describing Chemical Reactions In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question. 1. Which of the following is true regarding the law of conservation of mass? a. It dictates that the number of molecules on each side of a chemical equation must be the same. b. It dictates that the number of atoms of each element must be the same on both sides of a chemical equation. c. It states that the mass of the reactants must remain constant in order for a chemical reaction to proceed. d. It does not apply to chemical reactions.. Which of the following may indicate that a chemical reaction has occurred? a. release of energy as light b. a color change c. gas bubble formation d. All of the above 3. Which of the following is a product in the reaction described by the word equation below? iron + copper(ii) sulfate iron(ii) sulfate +copper a. iron(ii) sulfate b. copper c. iron d. Both (a) and (b) 4. What does CH 4 represent in the balanced chemical equation shown below? C + H CH 4 a. one atom of CH 4 b. five atoms of CH 4 c. one molecule of CH 4 d. 1 g of CH 4 5. Which of the following is not true regarding a properly written chemical equation? a. It must be balanced. b. It must contain proper chemical formulas. c. It must show the formation of a precipitate or a gas. d. It should represent known data. Modern Chemistry 1 Chemical Equations & Reactions

2 Section 8-1 Quiz, continued 6. In a chemical equation, the formula of a substance in water solution is followed by the symbol a. (l). b. (s). c. (g). d. (aq). 7. The Greek letter delta ( ) above the arrow in a chemical equation means a. yields or produces. b. a catalyst is used in the reaction. c. the reaction releases energy as heat. d. the reactants are heated. 8. What will be the result of the reaction described by the following chemical equation? PCl 5( g) PCl 3( g) Cl ( g) a. a mixture of PCl 5 (g) and PCl 3 (g) only b. a mixture of PCl 3 (g) and Cl (g) only c. a mixture of PCl 5 (g), PCl 3 (g), and Cl (g) d. PCl 5 (g) only 9. What is the total number of molecules represented by the following equation? C 4 H 10 (g) + 13O (g) 8CO (g) + 10H O(g) a. 4 b. 15 c. 18 d Which set of coefficients will balance the equation below? NaOH + Cu(NO 3 ) Cu(OH) + NaNO 3 a. 1, 1, 1, 1 b. 1,,, 1 c., 1,, 1 d., 1, 1, Modern Chemistry Chemical Equations & Reactions

3 Assessment Chemical Equations and Reactions Section 8- Quiz: Types of Chemical Reactions In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question. 1. What type of chemical reaction results in the formation of a single product? a. combustion b. synthesis c. decomposition d. displacement. Which of the following is a product that can be formed by doubledisplacement reactions? a. gas b. precipitate c. water d. All of the above 3. Which of the following is not an example of a possible type of displacement reaction? a. displacement of the metal in a compound by another metal b. displacement of the halogen in a compound by another halogen c. displacement of the hydrogen in water by a metal species d. displacement of the hydrogen in water by a halogen 4. Which of the following is true about decomposition reactions? a. Electricity may be used as the energy source. b. Only two products can be formed. c. Energy as heat must be added to start the reaction; then it must be removed. d. Both (a) and (b) 5. In the reaction Zn(s) + H SO 4 (aq) ZnSO 4 (aq) + H (g), what element has been displaced? a. Zn b. H c. S d. O Modern Chemistry 3 Chemical Equations & Reactions

4 Section 8- Quiz, continued 6.Which of the following equations represents a decomposition reaction? a. Sb(s) + 3I (g) SbI 3 (s) b. HgO(s) Hg(l) + O (g) c. FeS(s) + HCl(ag) H S(g) + FeCl (aq) d. Zn(s) + H SO 4 (aq) ZnSO 4 (aq) + H (q) 7. The reaction Pb(NO 3 ) (aq) + KI(aq) PbI (s) + KNO 3 (aq) is a a. double-displacement reaction. b. synthesis reaction. c. decomposition reaction. d. combustion reaction. 8. The reaction C H (g) + 5O (g) 4CO (g) + H O(l) is a a. combustion reaction. b. synthesis reaction. c. decomposition reaction. d. double-displacement reaction. 9. Which of the following equations represents a double-displacement reaction? a. FeS(s) + HCl(aq) H S(g) + FeCl (aq) b. HgO(s) Hg(l) + O (g) c. Sb(s) + 3I (g) SbI 3 (s) d. Zn(s) + H SO 4 (aq) ZnSO 4 (aq) + H (g) 10. The reaction Mg(s) + HCl(aq) H (g) + MgCl (aq) is a a. synthesis reaction. b. decomposition reaction. c. single-displacement reaction. d. double-displacement reaction. Modern Chemistry 4 Chemical Equations & Reactions

5 Assessment Chemical Equations and Reactions Section 8-3 Quiz: Activity Series of the Elements In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question. 1. In the activity series, the more active elements are found a. at the bottom. b. in the middle. c. at the top. d. Both (a) and (c). Which is true regarding the activity series? a. It can be established through a series of experiments involving replacement reactions. b. It is completely accurate in determining the outcome of a chemical reaction. c. It is useful for determining whether a decomposition reaction can occur. d. More-reactive species fall to the bottom of the series. 3. What can you predict by using an activity series? a. whether a certain displacement reaction can occur b. whether a chemical reaction will absorb energy c. the state of a product d. the melting points of elements 4. If metal A is placed in an ionic solution containing metal B ions and no reaction occurs, then metal B is most likely a. a halogen. b. higher on the activity series. c. not on the activity series. d. a catalyst. 5. Which statement is true regarding the reaction represented by the following equation? Zn(s) + CdCl (aq) ZnCl (aq) + Cd(s) a. Cadmium must have a higher activity than zinc. b. Zinc must have a higher activity than cadmium. c. Cadmium must not react with chlorine. d. Cadmium is an inert metal. Modern Chemistry 5 Chemical Equations & Reactions

6 Section 8-3 Quiz, continued 6. If zinc replaces iron, iron replaces lead, and zinc relaces lead in a chemical reaction, the order of activity from most active to least active is a. lead, iron, zinc. b. zinc, lead, iron. c. iron, zinc, lead. d. zinc, iron, lead. 7. A solution of calcium chloride, CaCl, is mixed with flakes of an unknown metal. A reaction is observed. Which of the following is most likely to be true, given the outcome of this experiment? a. The unknown metal is higher on the activity series than calcium. b. Calcium is higher on the activity series than the unknown metal. c. The unknown metal is higher on the activity series than chlorine. d. The unknown metal has more electrons than calcium. Use the activity series to the right to answer questions According to the activity series, which of the following singledisplacement reactions can occur? a. Ni(s) + MgSO 4 (aq) b. Al(s) + 3KOH(aq) c. 3Ca(s) + Al (SO 4 ) 3 (aq) d. Fe(s) + NaOH(aq) 9. Using the activity series, determine which of the following reactions is possible. cold a. Co( s ) H O( l) cold b. Na( s ) H O( l) hot c. Co( s ) H O( l) cold d. Zn( s ) H O( l) 10. Using the activity series, predict which of the following reactions can occur. a. Cr(s) + SnCl 4 (aq) b. Na(s) + KBr(aq) c. Na(s) + CdCl d. Both (a) and (c) Activity Series of Metals Activity of metals Reactions K react with cold Sr water and acids, replacing Ca hydrogen; react Na with oxygen, forming oxides Mg react with steam Al (but not cold water) and acids, Zn replacing Cr hydrogen; react Fe with oxygen, Cd forming oxides Co Ni Sn do not react with water; react with acids, replacing hydrogen Modern Chemistry 6 Chemical Equations & Reactions