Notesale: Turn your study into money

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CHEMISTRY TERMS AND DEFINITION
Element


Substance that CANNOT be chemically broken down into simpler substances

Atom


Smallest part of an element that can be identified as that element

Nucleus


Center, or core, of an atom (where the protons and neutrons are located)

Proton


Particle that has a positive charge - located in the nucleus of an atom
...


Neutron


Particle that has no charge - located in the nucleus of an atom
...


Electron


Particle that has a negative charge - located in rings outside the nucleus of an atom
...


Atomic number


Number of protons in the nucleus of an atom
...

Remember, 2-8-18-32
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Halogens


Elements that make up Group 17 in the periodic table

Noble gases


Elements that make up Group 18 in the periodic table

Matter


Anything that has mass and takes up space

Properties


Characteristics used to describe an object

State of matter


Any of the four physical forms of matter

Solid


State of matter with a definite shape and volume

Liquid


State of matter with a definite volume but no definite shape

Gas


State of matter that has no definite shape or volume

Plasma


State of matter made up of electrically charged particles - needs high temperatures and
high pressure

Chemical formula


Way of writing the name of a compound using chemical symbols

Subscript


Number written to the lower right of a chemical symbol in a chemical formula

Chemical equation


Statement in which chemical formulas are used to describe a chemical reaction

Coefficient


Number that shows how many molecules of a substance are involved in a chemical
reaction

Chemical reaction


Process in which new substances with new chemical and physical properties are formed

Reactant


Substance that is changed in a chemical reaction

Product


Substance that is formed in a chemical reaction

Molecule


Smallest part of a substance that has all the properties of that substance - more than
one element, like hydrogen and oxygen make water

Chemical bond


Force of attraction that holds atoms together

Freezing


Change from a liquid to a solid

Melting


Change from a solid to a liquid

Evaporation


Change from a liquid to a gas at the surface of the liquid

Condensation


Change from a gas to a liquid

Sublimation


Change from a solid directly to a gas

Physical change


Change that does not produce new substances - melting an ice cube or ripping paper
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Chemical change:


Change that produces new substances - burning wood to make ashes or mixing mentos
and coke
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