8th Grade Chemistry Word Wall

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

proton + A positively – charged particle that is located in the nucleus of an atom.

A particle with no charge that is located in the nucleus of the atom. neutron No Charge A particle with no charge that is located in the nucleus of the atom.

electron - (negative) A negatively – charged particle that is located outside of the nucleus of the atom.

The center of an atom, containing the protons and neutrons. nucleus The center of an atom, containing the protons and neutrons.

The region inside an atom where electrons may be found. electron cloud The region inside an atom where electrons may be found.

energy level Energy Level (Principal Quantum Number) Shell Letter Electron Capacity 1 K 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.

The electrons in the outermost energy level of an atom. valence electrons The electrons in the outermost energy level of an atom.

The number of protons in the nucleus of an atom. atomic number 14 Si 28.086 Silicon The number of protons in the nucleus of an atom.

The average mass of one atom of an element. atomic mass 14 Si 28.086 Silicon The average mass of one atom of an element.

The sum of the charges within an atom. electric charge The sum of the charges within an atom. - +

element 14 Si 28.086 Silicon

A substance made of two or more elements that are chemically combined. compound NaCl H2O HCl A substance made of two or more elements that are chemically combined.

Periodic Table of Elements A chart where all of the elements are arranged according to their atomic number and properties.

A vertical column of elements on the periodic table. group A vertical column of elements on the periodic table.

A horizontal row of elements on the periodic table.

physical property A property of a substance that can be observed without changing the identity of the matter.

chemical property A property of a substance that is based on its ability to react with another substance.

An element that is shiny, ductile, malleable, and a good conductor. metal An element that is shiny, ductile, malleable, and a good conductor. lead gold

nonmetal carbon sulfur An element that is not shiny, ductile or malleable and is not a good conductor.

An element that has properties of both metals and nonmetals. metalloid An element that has properties of both metals and nonmetals. silicon boron

chemical reaction A change that takes place when two or more substances interact to form new substances.

chemical formula CH4 A description that uses numbers and element symbols to represent the atoms that make up a compound.

chemical equation 6C02 + 6H20  C6H12O6 + 602 A way of writing changes in the arrangement of atoms during a chemical reaction, using chemical symbols.

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.

A starting material in a chemical reaction. reactant 6C02 + 6H20  C6H12O6 + 602 A starting material in a chemical reaction.

A substance formed from a chemical reaction. product 6C02 + 6H20  C6H12O6 + 602 A substance formed from a chemical reaction.

Law of Conservation of Mass It states that mass is neither created nor destroyed, it can only change forms.

A change that results in energy being given off. exothermic A change that results in energy being given off.

A change that results in energy being absorbed. endothermic A change that results in energy being absorbed.

conduction The transfer of heat from a warmer substance to a cooler one through direct contact.

The transfer of heat by the movement of a liquid or a gas. convection The transfer of heat by the movement of a liquid or a gas.

The transfer of heat through matter or space as electromagnetic waves. radiation The transfer of heat through matter or space as electromagnetic waves.

heat The transfer of thermal energy between objects that are at different temperatures.

specific heat The amount of energy needed to change the temperature of 1 gram of a substance by 1° C in temperature.

The total heat energy of the particles that make up a substance. thermal energy The total heat energy of the particles that make up a substance.

A measure of how hot or cold something is. temperature A measure of how hot or cold something is.

The exchange of matter and/or energy between two objects or systems. interaction The exchange of matter and/or energy between two objects or systems.

Anything that has mass and takes up space. matter Anything that has mass and takes up space.

energy The ability to do work.

Two or more bonded atoms. molecule H2O Two or more bonded atoms.