13 From the following pairs of chemical physical changes, choose one from each pair having the greater reaction rate, if each pair is subjected to the same experimental conditions a. Iron nails rusting or aluminium plate coming in air b. Evaporation of water or evaporation of ethanol c. Digestion of starch or digestion of glucose

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