Laboratory Marual for GeneralOrgenc and Sochemistry Seventh

Laboratory Marual for General,Orgenc and Sochemistry, Seventh Edition 83 Name __ease print last name first PRELIMINARY EXERCISES: 1. State the law of conservation of matter. In light of this law, what would you predict the Locker Number Date Experiment 6 Simple Chemical Reactions 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) Silver conducts an electric current. Hydrogen burns but does not support combustion. Mercury had a density of 13.6 gmL. Sugar dissolves in a hot cup of tea. a. b. c. d. (Think about this one. Is the sweet taste of sugar still there?) Diesel fuel burns in a truck engine. e. What chemical test could be used to confirm that the gas produced in a chemical reaction is carbon dioxide? Be specific, please. 3. 4. Balance the following equations: a. NaOH + (NH,apo, NagPO. + H2O + NH, (The Preliminary Exercises continue on the following page)

Solution

1) Law of conservation of Matter: Matter is neither created nor destroyed, so we must have the same number and type of atoms after the chemical chnages as were present before the change.

2) Physical property is the characteristic of the matter that is not associated witha a change in its checmical composition. Ex: density, color, hardness, meltingand boiling points, electrical conductivity.

Chemical Property can be measure only by changing the chemical identity of the substance. Ex: Toxicity, flammability, Enthalpy of formation, heat of combustion.

a) Silver conducts an electric current : Physical property
b) Hydrogen burns but doesnot support combustion: Chemical Property
c) Mercury had a density of 13.6 g/mL : Physical property
d) Sugar dissolves in hot cup if tea: Physical property
e) Diesel fuel burns in a truck engine: Chemical property

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