vocabulary


 * Define and give good examples from LAB, your READINGS IN THE TEXT, and your LIFE. **

** Atom = ﻿The smallest particle of an element that has the chemical properties of that element **

** Element = ﻿A substance that can't be broken down into a simpler substance **

** Molecule = ﻿A group of atoms that are held together by covalent bonds so that they move as a unit **

** Compound = ﻿A substance made up of two or more different types of atoms bonded together **

** periodic table = ﻿ A table of elements, arranged by atomic number, that show patterns in their properties **

** group = ﻿A vertical column in the periodic table of the elements. Elements in a group have similar properties **

** Period = ﻿A horizontal row in the periodic table of the elements. Elements in a period have varying properties **

** Noble gases = **

** Proton = ﻿ A positively charged particle located in an atom's nucleus **

** Neutron = ﻿A particle that has no electric charge and is located in the atoms nucleus **

** Electron = ﻿﻿A negatively charged particle located outside an atom's nucleus **

** Atomic number = ﻿The number protons and neutrons in the atom's nucleus **

** Atomic mass = ﻿The average mass of the atoms of an element **

** Isotope = ﻿ An atom of one element that has different number of neutrons than another atom of the same element **

** Ion = ﻿ An atom or group of atoms that has a positive or negative electric charge **

** Valence electrons = ﻿ The amount of electrons in the outer ring **

** Covalent bond = ﻿A pair of electrons shared by two atoms **

** Ionic bond = ﻿ The electrical attraction between a negative charge and a positive charge **

** Atomic model = **

** Phase change = ﻿ **

** Physical change - a change of state, or a change that can easily be undone **

** Chemical change = ﻿A change of one substance to another substance **

** Cyclic causality - a process that repeats over and over **

** Domino causality - a process that happens once **

** MIXTURE - ﻿ A combination of 2 or more ** **substances**

** suspension = ﻿ A mixture in which the different parts are identifiable as separate substances **

** solution = a mixture of two or more substances that is identical throughout ﻿ **

** solute - ﻿ In a solution, a substance that is dissolved in a solvent **

** solvent - ﻿ In a solution, the substance that dissolves a solute and makes up the largest percentage solution **

** dissolve - ﻿ **

** catalyst = **

** reactants= **

** products = **

** conservation of mass = **

** endothermic reaction - a reaction that collects energy **

** exothermic reaction - a reaction that releases energy **