Question Answer
PRHPMEDOCT problem research hypothesis procedure experiment data observations conclusion theory
matter anything that takes up space and has mass matter is made up of atoms
model a mental picture or figure
proton a subatomic particle with a positive charge found in the nucleus of an atom
neutron a subatomic particle with a neutral charge found in the nucleus of an atom
electron a subatomic particle with a negative charge moving around the nucleus
Bohr model of an atom an atomic model in which the electrons move around the nucleus in orbits developed by Neils Bohr, a Danish scientist.
elements made up-up of one type of atom
atomic number the number of protons in an atom
family a group of elements found vertically on the periodic table having similar characteristics
the periodic table the table that contains info about elements arranged by atomic number.
metals shiny can be shaped good conductors of heat and electricity
nonmetals dull can't be shaped not conductors of heat and electricity
semimetals share characteristics of both metals and nonmetals
noble gases dont combine easily with other elements
energy levels the number of electrons in each level of an atom
compound substance formed when two or more elements combine chemically and form a new substance
chemical bond forces that hold atoms together in a compound
ion atoms that have lost or gained an electron
molecule particle formed by sharing electrons
chemical formula a group of symbols that represent the elements in a compound
chemical symbol a letter that stands for the name of an element
organic compounds any compound that contains carbon
organisms any living thing
hydrocarbon any compound that contains only hydrogen and carbon
polymer an organic compound made of a chain of carbon atoms
indicator a dye which changes color when mixed with an acid or a base
acid a compound that turns blue litmus red and has a pH of 0-6
base a compound that turns red litmus blue and has a pH of 8-14
mono one
di two
tri three
tetra four
h2o water
co2 carbon dioxide
NaCl sodium chloride
CO carbon monoxide- dangerous
nh3 ammonia- dangerous
so2 sulfur dioxide-dangerous
pH of 7= neutral
salts formed when an acid is combined with a base
neutralization a chemical change when an acid is combined with a base neutralizing the acid and forming a salt and water
hydrogen h
carbon c
oxygen o
neon ne
sodium na
magnesium mg
aluminum al
sulfur s
calcium ca
colbalt co
copper cu
tungsten w
tin sn
gold au
mercury hg
lead pb
uranium u
helium he
nitrogen n
neon ne
magnesium mg
silicon si
chlorine cl
iron fe
zinc zn




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