Which substances are bases? check all that apply
a) hcooh
b) rboh
c) h2co3
d) ca(oh)2
e) nano3
f) hno3

The substances that are bases are

1. RbOH (answer B)

2. Ca(OH)2 (answer D)

explanation

A base is a substance that in aqueous  solution dissociate to give hydroxide ions (OH-)

RbOH  and Ca(OH)   are bases  since in aqueous solution they dissociate to release (OH-) ions according to below equations.

RbOH  → Rb+(aq)  + OH- (aq)

Ca(OH)2→  Ca2+ (aq) + 2OH- (aq)

answer: your mm

explanation:

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.