Biology Test1

properties that appear each step up in the hieracrhy of life

ex. a brain may not work properly even though it has all the parts, must arranged in certain way to function properly

the smalles unit of matter that sill retains the properties of an element

when one atom has the same # of protons but different # of neutrons, therefore it also has a greater mass

when an isotope is unstable (the nuclei has a tendency to lose particles and energy)

ex ¹⁴C becomes nitrogen after decay

when the nuclei do not lose particles and energy

ex. ¹² C ¹³ C

the # of electrons on the outer most shell 

the starting materials of a chemical reaction

what is formed after the chemical reaction

• REACTANT----------------->PRODUCTS
•                           reaction

the point when the reactants and products off set each other exactly.  so no more reactions will happen.

• 1) Molecules 2) Organelles
• 3) Cells4) Tissues
• 5) Organs 6) Organisms
• 7) Populations8) Communities
• 9) Ecosystems10) Biosphere

ionic-one atom gains a valence electron from a different atom, forming a negative ion (ANION) and a positive ion (CATION), respectively. These oppositely charged ions are attracted to each other, forming an ionic bond

covalent(stonrgest)-results when two atoms "share" valence electrons between

Hydrogen(weakest)-(polar, nonpolar