Matter Flashcards
What is a substance?
ALL elements and compounds are substances
what qualifies as a physical change?
cutting, freezing, melting, dissolving
what qualifies as a chemical change?
rusting, burning
what is an element
the simplest form of matter
what are the diatomic elements?
H2, N2, O2, F2, Cl2, Br2, I2
what is a compound
compounds consist of 2 or more elements and can be separated by chemical means
what is a mixture
mixtures are physical combinations of 2 or more pure substances with no definite ratio
do each substances in a mixture retain or combine their properties
retain
what is a homogenous mixture
looks uniform throughout
what is a heterogenous mixture
not uniform throughout
what is filtration
a process by which a precipitate is recovered from a mixture of
filtration is used only by…
heterogenous mixtures
what is distillation
simultaneous boiling of a liquid and condensation of its vapor
what is distillation based on
boiling point differences
what separates colors when using chromatography
differences in solubility and polarity
are aqueous mixtures heterogeneous or homogeneous
homogeneous
what change of state is melting
solid —> liquid
does melting absorb or release heat
absorb
does melting absorb or release heat
absorb
what change of state is freezing
liquid —> solid
does freezing release or absorb heat
release
what change of state is boiling/vaporization
liquid —> gas
does boiling absorb or release heat
absorb
what change of state is condensation
gas —> liquid
does condensation release or absorb energy
release
what change of state is sublimation
solid —> gas
what change of state is deposition
gas —> solid
