Perform the following arithmetic operations, and report the result to the proper number of significant figures: (a)105.5 l + 10.65 l, (b) 81.058 m - 0.35 m, (c) 3.801 x 10^21 atoms + 1.228 x 10^19 atoms, (d) 1.255 dm x 25 dm, (e)139 g ã· 275.55 ml.

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

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

Which one of the following substances would be the most soluble in ccl4? na2so4 h2o ch3ch2ch2ch2oh c4h10 hi