A single grain of sand occupies a volume of about 0.004 cubic millimeters. Based on your previous answer, how many
grains of sand are on Earth's beaches?
There are 109 cubic millimeters in each cubic meter. Express your answer to the correct number of significant figures.
There are
10
grains of sand on the beaches.

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 answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.

Concentrations expressed as a percent by mass are useful when the solute is a a. liquid b. gas c. solid