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Unformatted text preview: 295 LAW OF CONSERVATION OF MASS OBJECTIVES FOR THE EXPERIMENT The student will be able to do the following: 1. Write or identify a description of the Law of Conservation of Mass. 2. Given formulas for the reactants in a double displacement reaction, write the complete balanced equation for the reaction. 3. Write or identify a description of double displacement reactions. 4. Given a formula for a substance, identify whether it is an ionic compound. 5. Given a formula for an ionic compound, write the formulas for each ion in the compound. 6. Write formulas for ionic compounds from the formulas of the ions. 7. Convert between the formula and name for the following polyatomic ions: carbonate, nitrate, hydroxide, sulfate, sulfite, acetate, perchlorate, and ammonium. 8. Convert between the name and formula for nitric acid and sulfuric acid. 9. Write the formulas for the products of the reaction of the carbonate ion with acid. 10. Write or identify the definitions of net reaction and single-step reaction. 11. Write or identify the definition of ion complex. 12. Identify the states and colors of reactants and products based on experimental observation, experience, and logic. 13. Separate solids from liquids using gravity filtration. 14. Test solutions to see if they are acidic or basic using litmus paper. BACKGROUND TO THE EXPERIMENT The main purpose of this experiment is to help you gain a greater understanding of chemical equations. You will learn to visualize a chemical reaction just from looking at its chemical equation. A secondary purpose of this experiment is to illustrate the Law of Conservation of Mass. You carry copper through a series of reactions: Cu Cu(NO 3 ) 2 Cu(NO 3 ) 2 Cu(OH) 2 CuCO 3 Cu(OH) 2 CuCO 3 CuO CuO CuSO 4 CuSO 4 Cu According to the Law of Conservation of Mass, the mass of metallic copper reclaimed at the end of the series should be the same as the initial mass. 296 Lab Manual Conservation of Mass PRELAB ASSIGNMENT Before coming to the lab, write out balanced equations for each reaction on the report sheet provided. Some of them are given to you in the procedure and on the data sheet. Almost all the reactions are double displace- ment reactions. Double displacement reactions have the following general formula. AB + CD AD + CB The AB and CD in double displacement reactions are often ionic compounds. The following are examples of double displacement reactions. ZnBr 2 ( aq ) + Li 2 S( aq ) ZnS( s ) + 2LiBr( aq ) Pb(NO 3 ) 2 ( aq ) + (NH 4 ) 2 CO 3 ( aq ) PbCO 3 ( s ) + 2NH 4 NO 3 ( aq ) The AB and CD can be acids. The following are common acids used in this experiment. HNO 3- nitric acid H 2 SO 4- sulfuric acid NaOH( aq ) + HNO 3 ( aq ) NaNO 3 ( aq ) + H 2 O( l ) When water reacts in a double displacement reaction it acts as if it were hydrogen hydroxide, H-OH....
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This note was uploaded on 03/03/2012 for the course CHEM 100 taught by Professor Mark during the Fall '06 term at Monterey Peninsula College.
- Fall '06