what is matter?

anything that occupies space and has weight

what is element?

matter composed of atoms with the same number of postive changes in their nucli

what is atom

smallest unit of an element

what are 4 body elements that make up 96 % of body weight

oxygen, carbon, hydrogen,nitrogen

what are the three parts of an atom?

protons, neutrons, and electrons

what is the charge of a proton?

positive

charge of electron?

negative

charge of a neutron

neutral

what type of bond involves a electronic transfer?

ionic bond

what type of bond involves sharing electrons?

covalent bond

weak bond responsible for water properties

hydrogen bond

what is an ion?

an atom with a charge due to a gain or loss of electrons

what is a cation

positive ion (lost electrons)

what is an anion

negative ion (gained electrons)

what is an electrolyte

substance that forms ions in water and conducts electricity

name one function of water in the body

temp regulation,solvant, lube, transport, chemical reactions

what is a molecule

two or more atoms bonded together

what is a compound

two or more differnt elements bonded together

what is a catalyst

speeds up reactions without being used up

what are enzymes

biological catalyst (proteins)

what is ph?

measure of hydrogen ion concentration

what is the ph scale range?

0-14

acid

realses hydrogen ions

base def

accepts H+ or releases H-

what molecule transfers energy in cells

ATP

what does atp stand for

adenosine triphosphate

list the 6 forms of energy

chemical, electrical, machinal, radiant, thermal, nuclear,

what is a solution

homogeneous mixture (solute solvent)

what is a suspension?

large particles that settle out

what is a colloid

particles that do not settle out (plasma)

what is a precipate

solid formed from during a solution during a reaction