43 Name Locker Number Experiment 3 The Identification of an Unknown Liquid PRELI

Question

43 Name Locker Number Experiment 3 The Identification of an Unknown Liquid PRELIMINARY EXERCISES: 1. Indicate which of the following would be considarod physical properties (P) and which would be considered chemical properties (C) of fron. a. Iron reacts with axygen to form iron axidos. b. Iron is a good conductor of heat and electricity. c. Iron melts at 1535 C d. When trom is immersed in a solution of hydrochloric acid, hydrogen gas i produced. e. Iron becomes red-bot when beated. f. A 500-cc volume of iron has a mass of 3930 g, hon can be polished to a high luster. The mass of 10.00 mL of carbon tetrachloride was measured to be 15.94 &What; is the density of carbon tetrachloride? 2· Density 3. (a) The density of water is 1.00 gml. Carbon tetrachloride is insoluble in water. Would carbon tetrachloride float on water or sink beneath water when they are combined? b) Hexane has a density of 0.66 g'al, and is also insolable in water. Would hexane float on water or sink beneath water when mbxed with water 4. A student determined that an unknown liquid was soluble in an oqual volumoe of water approximately asgh Land a bolling temperature of 55.5 C Consult had a density of Table 1 and identify the liquid The liquid is:

Explanation / Answer

Q1

a)

this is chemical property, since there is a new chemical formed, Iron oxide

b)

this is a physcal property, since iron remains being iron

c)

iron melting remains as iron, oonly change of phase, therefore physcal change

d)

there is reaction, therefore, chemicla change, since Fe(s) = Fe+3(aq) loss of e-

e)

red hot when heated --> still iron, so physcal property

f)

this is physcal property, no effec tin change of chemical compoisiotn

g)

iron remains being iron aster pulished

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