83 Laboratory Manual for General Organic, and Blochemistry, Seventh Editión Date
ID: 551727 • Letter: 8
Question
83 Laboratory Manual for General Organic, and Blochemistry, Seventh Editión Date Locker Number Name Plesse print last ame frst Experiment 6 Simple Chemical Reactions State the law of conservation of matter. In light of this law, what would you predict the PRELIMINARY EXERCISES 1. results of the two weighings in reaction 8 to be? 2. Classify each of the following as a physical property (PP) or a chemical property (CP) a. Silver conducts an electric current. b. Hydrogen burns but does not support combustion Mercury had a density of 13.6 ginL Sugar dissolves in a hot cup of tea. (Think about this one. Is the sweet taste of sugar still there?) Diesel fuel burns in a truck engine. c, -d. e. 3. What chemical test could be used to confirm that the gas produced in a chemical reaction is carbon dioxide? Be specific, please. 4. Balance the following equations: The Preliminary Exercisos conlimus on the following page)Explanation / Answer
1. The law of conservation of matter states that the mass of the product will always be equal to the mass of the reactants.
2.
a) Silver conducts an electric current = It is a physical property (PP).
b) Hydrogen burns but does not support combustion = It is a chemical property (CP).
c) Mercury had a density of 13.6 g/mL = It is a physical property (PP).
d) Sugar dissolves in a hot cup of tea = It is a physical property (PP).
e) Diesel fuel burns in a truck engine = It is a chemical property (CP).
3) If carbon dioxide gas (CO2) gas is passed through lime water [ Ca(OH)2] , then the lime water will turn milky due to the formation of a precipitate of calcium carbonate (CaCO3) . This confirms the presence of CO2.
4)
a) 3NaOH + (NH4)3PO4 ------> Na3PO4 + 3H2O + 3NH3
b) C2H6O + 3O2---------> 2CO2 + 3H2O
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