The structure of hydrogen sulphide (Mr = 34.1 g mol-1 ) is analogous to water (Mr = 18.0g
mol-1
). Despite having larger molecular mass than water, the boiling point of hydrogen

sulphide at STP is -60.2°C whereas the boiling point of water is 99.61 °C under the same

condition. Explain this observation.

Is this a single replacement reaction or there is no

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

  the mississippians were considered to be  horticulturalists, which means they were