Chapter 1 Flashcards
atom
smallest unit of matter that has all the properties of the element
element
a pure substance made of one type of atom
matter
anything that has mass and takes up space
mixture
a physical combination of two or more substances
pure substance
has a constant composition and distinct chemical properties
homogenous mixture
a mixture of substances blended so thoroughly that you cannot see individual substances
heterogenous mixture
a mixture in which the composition is not uniform throughout the mixture
examples of physical changes
ice melting, cutting paper
methods of reversing physical changes
evaporation, distillation, diffusion, filtration
examples of chemical changes
cooking food, oxidation
electrolysis
the only method of reversing a chemical change
mass
the amount of something present; the volume
weight
the pull of gravity on the mass of an object
sublimation
changes directly from a solid to a gas
