Sharon T. Pochron

Aug 23, 2024 | snexplores.org | Sharon T. Pochron |Lillian Steenblik Hwang |Bethany Brookshire

chemical: A substance formed from two or more atoms that unite (bond) in a fixed proportion and structure. For example, water is a chemical made when two hydrogen atoms bond to one oxygen atom. Its chemical formula is H2O. Chemical also can be an adjective to describe properties of materials that are the result of various reactions between different compounds. dinosaur: A term that means terrible lizard. These reptiles emerged around 243 million years ago.