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science 7

chapters 1-5 review7

chemical changes a color change, a gas is released, a precipitate is formed
physical changes changes shape or phase. ex. freezing or boiling ice and cutting wood or hair
flammability the ability of a substance to burn in the presence of oxygen
reactivity the ability of a substance to react with another substance. can be high or low
heterogeneous cant see particles
homogeneous can see particles
vaporization liquid to gas
condensation gas to liquid
melting solid to liquid
freezing liquid to solid
sublimation solid to gas
deposition gas to solid
solid definite shape and volume tightly packed, vibrate in place
gas no definite volume or definite shape move freely, collide with each other and the walls around them
liquid definite volume but not a definite shape packed but able to slide past each other
viscosity a substance resistance to flow when heat is removed viscosity increases when heat is put in viscosity decreases
atomic number protons and electrons
mass number usually a decimal
nucleus positive and negative charge(protons and electrons)
protons positive charge
neutrons no charge
electrons negative charge
Created by: mbattaglia83