MAGNETS 1.Magnets can attract almost all things made of
a. plastic b. metals c. wood
2.The discovery of the magnet led to many
a. inventions b. revolutions
c. problems
3.Magnets made possible the inventions of the
a. compass b. computer c. camera
4.Pilots, sailors, boy scouts, soldiers and engineers depend much on
a. compass b. electricity c. motors
5.Magnets also make use of
a. electricity b. gas c. water powder
6.Electric and industrial motor became possible after the discovery of
a. electricity b. magnets c. water power
7.Compass is most useful to
a. farmers b. teachers c. travellers
8.Motors make use of
a. magnets b. plastic c. wood
9.these days, magnets
a. are no longer used b. are still being used c. has been replaced
10.Compass, too
a. are no longer being used b. are still being used c. has been replaced.

Lem 2 the data below are for the system ethyl propyl ether (1)-chloroform (2) at 0.5 bar. use the data to answer the following questions (all questions refer to p d 0: 5 bar). a) what are the boiling points of the pure components at 0.5 bar? b) a mixture with the overall composition z1 d 0: 1 is brought to 47.6ä±c, 0.5 bar. what is the phase? c) 100 mole of a mixture with z1 d 0: 1 (state a) is mixed with 22 mole of pure ethyl propyl ether vapor (state b). the mixing takes place at 47.6 ä±c, 0.5. bar. what is the phase of the resulting mixture (state c)? if the state is a v/l mixture report the number of moles and mole fractions in each phase. d) plot the txy graph and show states a, b and c. the graph must be done by computer and should be properly annotated. ethyl propyl ether (1) - chloroform (2) at 0.5 bar t ( ä±c) x1 y1 t ( ä±c) x1 y1 42.9 0.000 0.000 49.0 0.470 0.455 43.0 0.020 0.010 49.1 0.520 0.520 43.9 0.065 0.029 48.9 0.567 0.592 45.4 0.156 0.089 48.3 0.652 0.720 46.4 0.215 0.142 47.6 0.745 0.815 47.6 0.296 0.223 46.7 0.822 0.872 48.3 0.362 0.302 45.7 0.907 0.937 48.7 0.410 0.375 44.6 1.000