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Unit1Vocab

Atoms, molecules, reactions

TermDefinition
Atom The smallest piece of matter that has the properties of an element .
Molecule The particle of a substance that is made from a combination of two or more atoms of different elements bonded together.
Proton In an atom, the particle that has mass and carries a positive charge.
Neutron The particle of an atom that has mass and no electrical charge.
Electron The part of the atom that carries little mass and has a negative electrical charge
Element A substance that is made up entirely of only one type of atom
Chemical Change When a substance undergoes a molecular change that cannot be reversed, like spoiled milk.
Physical Change When a substance undergoes a change in form, but the substance itself remains unchanged.
Endothermic reaction When molecules interact to form new molecules, and in the process, energy is absorbed from the environment.
Chemical reaction The process of rearranging atoms of original molecules into new substances with different properties
Exothermic reaction When substances interact in a chemical reaction and energy is released in the process.
Mass The amount of matter that makes up a substance, measured in grams.
Matter Anything that takes up space and has mass.
Reactants Atoms or molecules of substances that interact to cause a chemical reaction.
Products New, different molecules that are formed when different molecules interact.
Phases of matter When substances can exist in different forms, like ice, water and water vapor, these forms are known as:
Property Any observable or measurable characteristic of a substance.
Material Any substance that has been designed to be used for certain application, whether natural or made by man.
Science All knowledge that has been obtained by conducting experiments.
Nucleus In an atom, where protons and neutrons are located.
Created by: DrRJette