1. Chemistry Ch. 8 Test REVIEW SHEET

2. 1. In the reaction described by the word equation sodium + water → sodium hydroxide + hydrogen gas What are the reactants? What are the products? SODIUM AND WATER SODIUM HYDROXIDE AND HYDROGEN GAS

3. 2. What does it mean to say that a chemical equation is balanced? 3. What are three things that you can obtain from a complete and correctly written chemical equation? THE NUMBERS OF ATOMS OF EACH ELEMENT ARE THE SAME ON BOTH SIDES OF THE EQUATION. Physical states of the reactants and products. Relative amounts of the reactants and products. Chemical formulas of the reactants and products.

4. 4. To balance a chemical equation, you must adjust the ______________s in front of each compound. 5. The formation of a solid product in a chemical reaction is represented by what symbol? COEFFICIENTS (S)

5. 6. How does the law of conservation of mass relate to chemical equations? 7. Write the balanced equation for the reaction between iron and oxygen. THE NUMBERS OF ATOMS OF EACH ELEMENT ARE THE SAME ON BOTH SIDES OF THE EQUATION. 2Fe + O 2  2FeO

6. 8. Correctly balance the formula equation below. ____KClO 3 (s) → ____KCl(s) + ____O 2 (g) 9. In which type of reaction do two or more compounds react to form one product? 2 2 3 SYNTHESIS

7. 10. Explain how you would recognize a single-displacement reaction? 11. A mixture of propane and oxygen react to form carbon dioxide and water. What type of chemical reaction is this? ONE ELEMENT REPLACES ANOTHER IN A COMPOUND. COMBUSTION

8. 12. What type of chemical reaction does the following chemical equation represent? 2HCl(aq) + Cr(s) → H 2 (g) + CrCl 2 (aq) 13. Calcium carbonate, CaCO 3, reacts to form calcium oxide, CaO, and carbon dioxide, CO 2. What type of reaction is this? SINGLE DISPLACEMENT DECOMPOSITION

9. 14. In a chemical equation, the symbol (l) indicates that the substance is ___________________. 15. The law of __________________________________ must be satisfied for a chemical equation to be balanced. LIQUID CONSERVATION OF MASS

10. Write a word equation for each chemical reaction in the space provided. 16. 2ZnS(s) + 3O 2 (g) → 2ZnO(s) + 2SO 2 (g) ZINC SULFIDE REACTS WITH OXYGEN TO CREATE ZINC OXIDE AND SULFUR DIOXIDE

11. Write a formula equation for each word equation in the space provided 17. aluminum metal + copper(II) chloride --> aluminum chloride + copper metal 18. calcium carbonate → calcium oxide + carbon dioxide Al + CuCl 2  AlCl 3 + Cu CaCO 3  CaO + CO 2

12. Balance the following formula equations in the space provided 19. ____ C 5 H 12 + ____ O 2 → _____ H 2 O + ____ CO 2 20. ____ PbO 2 → ____ PbO + ____ O 2 21. ____ AgNO 3 + ____ CuCl 2 → ____ AgCl + ____ Cu(NO 3 ) 2 22. ____ KNO 3 + ____ MgSO 4 → ____ K 2 SO 4 + ____ Mg(NO 3 ) 2 1 8 6 5 2 2 1 2 1 2 1 2 1 1 1

13. Predict the products for the following equations and balance 23. ____ Zn + ____ Cu(NO 3 ) 2 → 24. ____ NaBr + ____ Cl 2 → 25. ____ MgCl 2 + ____ AgNO 3 → 1 1_1_Zn(NO3)2 +_1Cu 2 1 _2_NaCl + __1_ Br 2 1 2 2_AgCl + 1 Mg(NO 3 ) 2

14. On the line to the left, identify each chemical equation as a synthesis, decomposition, single-displacement, or double-displacement reaction. 26. ________________________ CaO(s) + H 2 O(l) → Ca(OH) 2 (s) 27. ________________________ Cl 2 (g) + 2KBr(aq) → 2KCl(aq) + Br 2 (l) 28. ________________________ HCl(aq) + NaOH(aq) → NaCl(aq) + H 2 O(l) 29. ________________________ 2H 2 O(l) → 2H 2 (g) + O 2 (g) SYNTHESIS SINGLE DISPLACEMENT DOUBLE DISPLACEMENT DECOMPOSITION