Bio Basic Chemistry Study Guide

matter
the substance(s) of which any physical object consists or is composed
element
a form of matter that occupies space, has mass and cannot be broken apart into a different form of matter by ordinary, physical or chemical means
compound
molecule composed of two or more different elements in unvarying proportions
protons
positively charged particles of the atomic nucleus
neutrons
uncharged particles of the nucleus of all atoms except hydrogen
electrons
negatively charged particles that can occupy a volume of space around an atomic nucleus
We will write a custom essay sample on
Any topic specifically for you
For only $13.90/page
Order Now
shell/orbital
the region around a nucleus that indicates probable location or an electron
ion
an element where your atoms (electrons) change
isotope
different number of neutrons/types of atoms in one element
activation energy
the minimum amount of energy required to activate atoms to a point where they can go through physical transport
valence electron
an electron associated with an atoman that can participate in the formation of a chemical bond which can determine its chemical properties
ionic bond
these form when one atom gives up an electron to another, thus creating a positive ion that is attracted to a negative ion
covalent bond
forms when two atoms share one or more pairs of electrons
polar covalent
a bond in which electrons are shared between elements having a difference in electronegativity
adhesion
the process of adhering or sticking to a surface or object
cohesion
the action of something forming a unite whole
surface tension
the force that causes the molecules on the surface of a liquid to be pushed together and form a layer
pH
a scale ranging from 0-14 comapring the concentration of hydronium ions (H3O+) and hydroxide ions (OH) in a solution
acid
substance that donates H+ when dissolved in water
base
substance that accepts H+ when dissolved in water
enzyme
a substance in animals and plants that helps to cause natural processes
nucleus
the central and most important part of an object, forming the basis for its activity and growth.