Introduction for Reactions
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20 Terms
Matter
Material that occupies space and contains mass
Homogenous mixture
Visibly indistinguishable parts
Heterogeneous mixture
Visibly distinguishable parts
Compound
Substance with constant composition that can be broken down into elements by chemical processes
Pure substance
Substance with one constant composition
Elements
Substance that can’t be decomposed into simpler substances by chemical or physical means
Physical change
Physical property of a substance changes without changing the composition
Solid to liquid
Melting
Liquid to solid
Freezing
Gas to liquid
Vaporization
Liquid to gas
Condensation
Gas to solid
Deposition
Solid to gas
Sublimation
Chemical change
Property of a substance changes through the breaking of bonds and formation of new bonds
Evidence of chemical reactions
Production of a precipitate
Color change
Light
Change in temperature
Sounds
Production of a gas
Formation of a new substance with new properties
Synthesis
A + B → AB
Decomposition
AB → A + B
Single replacement
A + BC → AC + B
Double replacement
AB + CD → AD + BC
Combustion
CxHy + O2 → CO2 + H2O
