Emma and her lab partner were studying how abiotic factors affect organisms. they chose to work with daphnia and study the ph range at which they survived best. they used plastic tubing that could be closed off at each end. 10 daphnia were placed in the tubing filled with water. a 1% solution of hcl was injected into one end of the tubing while 1% solution of koh was injected into the other end. the daphnia were observed in 1 minute intervals for 20 minutes and their behavior (ph preference) was recorded. they conducted three trials.

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