8th%20Grade%20Chemistry%20Word%20Wall

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8th Grade Chemistry Word Wall

• Chemistry

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atom
The smallest particle into which an element can
be divided and still have the properties of that
element.
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proton

A positively charged particle that is located
in the nucleus of an atom.
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neutron
No Charge
A particle with no charge that is located in the
nucleus of the atom.
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electron
- (negative)
A negatively charged particle that is located
outside of the nucleus of the atom.
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nucleus
The center of an atom, containing the protons and
neutrons.
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electron cloud
The region inside an atom where electrons may be
found.
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energy level
Energy Level(Principal Quantum Number) Shell Letter Electron Capacity
1 K 2
2 L 8
3 M 18
4 N 32
5 O 50
6 P 72
A specific area in an atom at a definite distance
from the nucleus.
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valence electrons
The electrons in the outermost energy level of an
atom.
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atomic number
14 Si 28.086 Silicon
The number of protons in the nucleus of an atom.
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atomic mass
14 Si 28.086 Silicon
The average mass of one atom of an element.
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electric charge
The sum of the charges within an atom.
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element
14 Si 28.086 Silicon
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compound
NaCl
H2O
HCl
A substance made of two or more elements that are
chemically combined.
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Periodic Table of Elements
A chart where all of the elements are arranged
according to their atomic number and properties.
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group
A vertical column of elements on the periodic
table.
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period
A horizontal row of elements on the periodic
table.
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physical property
A property of a substance that can be observed
without changing the identity of the matter.
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chemical property
A property of a substance that is based on its
ability to react with another substance.
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metal
An element that is shiny, ductile, malleable, and
a good conductor.
lead
gold
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nonmetal
carbon
sulfur
An element that is not shiny, ductile or
malleable and is not a good conductor.
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metalloid
An element that has properties of both metals and
nonmetals.
silicon
boron
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chemical reaction
A change that takes place when two or more
substances interact to form new substances.
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chemical formula
CH4
A description that uses numbers and element
symbols to represent the atoms that make up a
compound.
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chemical equation
6C02 6H20 ? C6H12O6 602
A way of writing changes in the arrangement of
atoms during a chemical reaction, using chemical
symbols.
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balanced equation
6C02 6H20 ? C6H12O6 602
A chemical equation in which the number of atoms
of each substance are equal for both the products
and the reactants.
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reactant
6C02 6H20 ? C6H12O6 602
A starting material in a chemical reaction.
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product
6C02 6H20 ? C6H12O6 602
A substance formed from a chemical reaction.
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Law of Conservation of Mass
It states that mass is neither created nor
destroyed, it can only change forms.
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exothermic
A change that results in energy being given off.
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endothermic
A change that results in energy being absorbed.
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conduction
The transfer of heat from a warmer substance to a
cooler one through direct contact.
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convection
The transfer of heat by the movement of a liquid
or a gas.
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radiation
The transfer of heat through matter or space as
electromagnetic waves.
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heat
The transfer of thermal energy between objects
that are at different temperatures.
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specific heat
The amount of energy needed to change the
temperature of 1 gram of a substance by 1 C in
temperature.
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thermal energy
The total heat energy of the particles that make
up a substance.
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temperature
A measure of how hot or cold something is.
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interaction
The exchange of matter and/or energy between two
objects or systems.
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matter
Anything that has mass and takes up space.
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energy
The ability to do work.
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molecule
H2O
Two or more bonded atoms.