Ch:2 Anatomy

chemical bonds

a chemical bond occurs when atoms are held together by forces of attraction

what is a molecule

2 or more atoms sharing electrons

organic compounds

always contain hydrogen, usually contain oxygen, and always have covalent bonds

what is inorganic compound 

inorganic compounds usually lack carbon and are simple molecules 

what are atoms composed of ?

protons, neutrons ,electrons

matter exist in?

solid, liquid, gas

what is a atomic number ?

is an number of protons in the nucleus of an atom

what is a mass number 

is the number of protons and neutrons in an atom 

Mixture

a combination of elements or compounds that are physically blended together but not bonded together.

3 types : solution, collide , suspension

what is RNA

Guides protein formation

What is DNA

forms the genetic code in the nucli of the body cells and it regulates most of the cell’s activities

What is an Ion 

an atomthat has gained or lost an electron 

Atom

is the smallest units of matter that retain the properties and characteristics of an element

types of chemical reactions

synthesis, decomposition, exchange, reversible, oxidation-reduction

chemical reactions

occurs when new bonds are formed or old bonds are broken

Protein 

give structure to the body, regulate processes, provide protection, assist in muscle contraction, transport substances, and serve as enzymes 

Compound

a substance that can be broken down into 2 or more different elements

ATP ( Adenosine Triphosphate)

the principle energy-storing molecule in the body