Sio2, which melts at 1723°c, and tio,, which melts at 1842°c, in the solid state, and the sio,-tio, binary system contains a monotectic equi- librium at 1794°c, at which temperature virtually pure tio, is in equilibrium with two liquids containing mole fractions of sio, of 0.04 and 0.76. if, for the purpose of simple calculation, it is assumed that the compositions of the two liq- uids are immiscible are xsio 0.24 and xsio, 0.76 and that the liquid solutions are regular in their behavior, what is the value of a, and at what temperature does the liquid toaibilitu aan disannear?

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next