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21 Cards in this Set

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  • Back
physical change
The change in the size, shape, or state of a material.
chemical change
Any change in which one or more new substances are formed.
model
a way to represent an object or to describe how a process takes place.
nucleus
mass of an atom contained in a dense, central core. It contains protons and neutrons.
proton
a particle with a positve electic charge.
neutron
a particle with no electric charge.
electron
a particle with a negative electric charge.
atomic number
an element is the number of protons in an atom of that element.
ion
an electrically charged atom
radioactive element
an element made up of atoms whose nuclei ( plural for nucleus) breaks down, or decays, into nuclei of other atoms.
nuclear fission
The reaction of splitting of the nuclei of some atoms by bombarding them with neutrons.
acid
a compound that turns blue litmus paper red.
indicator
a substance that changes color when mixed with an acid or a base.
base
a compound that turns red litmus paper blue
neutralization
The reaction between an acid and a base.
salt
a compound that can be formed when an acid reacts with a base.
polymer
an organic compound made up mainly of a very long chain or chains of carbon compounds.
synthesis
Putting together. ex. hydrogen gas and oxygen gas combine to produce water.
Decomposition
involves the breaking down of a substance into simpler substances.
single replacement
reaction in which one of the elements in a compound is replaced by another element.
Double replacement
reaction where elements from two different compounds change places.