Matter and Energy

 

 

matter

 

anything that

has a mass and takes up space

 

 

atom

smallest unit of an element that maintains the chemical identity

 

 

solid

is a state of matter that is a fixed shape and volume particles are tightly packed

 

 

liquid

is a state of matter that has definite volume, takes shape of the container, and particles move

 

 

gas

 

no fixed shape or volume

 

 

 

pure substance

something that is made completely of an element or compound

 

 

element

made of only one type of atom

 

 

compounds

made of two or more elements chemically bonded in a fixed proportion

 

 

melting

 

solid to a liquid

 

 

evaporation

 

liquid to a gas

 

 

freezing

 

liquid to a solid

 

 

condensation

 

gas to a liquid

 

 

sublimation

solid to a gas

(ex:  dry ice)

 

 

deposition

 

gas to a solid

 

 

mixtures

blend of two or more substances

 

 

heterogeneous

mixture

 

visibly different parts

 

 

homogeneous mixture

does not have visibly different parts, also called solutions

 

 

alloys

homogenous mixture of metals

 

 

physical properties

physical characteristics including shape, texture, color, volume, melting point, boiling point

 

 

chemical properties

a substances ability to react with other substances to produce a new substance

 

 

pure substance

made of one element or compound

 

 

compounds

made of two ore more elements chemically bonded in a fixed proportion

 

 

chemical properties

change in composition, reaction of a substance, heat evolved, exothermic, endothermic, gas released, color change, formation of precipitate

 

 

exothermic

chemical change where heat is absorbed

 

 

endothermic

chemical change where heat is absorbed

 

 

formation of precipitate

solid formed and drops down in a chemical reaction

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