Helen’s high-school class visited a nearby laboratory. There, they spoke with James, a biotechnology R&D professional who told them what he does. Choose the correct way to complete each sentence. James works under the supervision of a biological scientist. He is a . James ensures that machines run correctly in the laboratory. He also enforces at the laboratory.

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