Question

Geckos and water striders rely on forces between molecules. Which statement best identifies the forces involved?
a. Geckos use covalent bonds to stick to glass.

b .The type of force that water striders use is stronger than the type of force that geckos use.

c. Water striders use London dispersion forces to walk on water.

d. The type of force that geckos use is attractive, and the type of force that water striders use is repulsive.

Answer 1

B .The type of force that water striders use is stronger than the type of force that geckos use.

Answer 2

Answer:

b .The type of force that water striders use is stronger than the type of force that geckos use.

Explanation:

Geckos and water striders use attractive forces for stick to glass and to walk on water, respectively. The glass is a nonpolar substance, and it's possible that in geckos paws there are nonpolar substances, so the force between them is London's forces.

The water is a polar compound, and the water strides make dipole-dipole forces to walk on water, because in its pawns that are polar molecules too.

Dipole-dipole force is stronger than London's forces because the polar substances are more attracted between them (electrostatic attraction).