Which two reactions are faster than the others? Silver tarnishes in air that contains hydrogen sulfide.
Iron metal reacts with oxygen in air to form rust.
Lead nitrate and potassium iodide react to form a yellow precipitate.
Lead nitrate and potassium iodide react to form a yellow precipitate.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.

they all get energy from eating other animals, dead animals to be more precise.

hienas tends to steal pray from other animals. crows and vultures tend to eat dead animals and leftovers.

hope it ,

bioteacher101