What causes the brownian motion of particles in a colloid? a) collisions between the particles and surrounding molecules b)interactions with rays of light that shine through the colloid c )the force of gravity, which pulls the particles downward d) electrical attractions between the particles and surrounding molecules

The correct answer option is a) collisions between the particles and surrounding molecules.

Explanation:

The collisions between the particles and surrounding molecules causes the Brownian motion of particles in a colloid.

Brownian motion is the irregular movement of the microscopic particles in a fluid which bombard into each other.

It basically is the result of the molecules of a dispersion medium colliding with the dispersed particles of the phase.

kuchisake

kuchisake-onna (口裂け女, "slit mouth woman ") is a malevolent figure appearing in japanese ghost stories, possibly dating back to the edo period. she takes the form of a masked woman who approaches people and asks them if they believe she is pretty.

explanation:

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.