All of the following statements are true of compounds EXCEPT * compounds are composed of various elements.
the processes that form compounds can not be reversed.
a compound is a pure substance.
compounds are joined by a chemical reaction.

Pure substances are further broken down into elements and compounds. ... A mixture is composed of different types of atoms or molecules that are not chemically bonded. substance A form of matter that has constant chemical composition and ... of atom and cannot be broken down or transformed by a chemical reaction.

Explanation:

clouds form

solid ice forms on leaves.

water droplets form on grass.

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.