Chlorine gas contains two chlorines that are held together by a bond which is the best classification for chlorine gas.? a. atom b. molecule c. element d. compound

Explanation:

An atom is smallest unit of a matter or substance.It consist of three subatomic particles : electrons, protons, neutrons.

Element is a pure substance which is composed of atoms of similar elements.  Example: Hydrogen (H).

Molecule is a pure substance formed by combination of atoms of similar elements called as molecule of element. Example: Hydrogen molecule , Chlorine molecule

The combination of atoms of different elements is called as molecule of compound. Example: Water

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.  Example: Water

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.