pure substances and mixtures x Flashcards
what is all matter made up of
tiny particles called atoms
what is a chemical element made up of
only one type of atom
what can elements combine with and what happens
one another to make new substances called compounds
what is a compound
a substance which contains at least 2 different elements chemically joined together
what is it difficult to do after atoms are chemically joined
separate them
what is a pure substance
a single substance which is not mixed with anything else. one single chemical
what is a mixture
a mixture contains different substances mixed together
what is the air we breathe
a mixture of different gases both elements and compounds
what can a mixture be separated into
pure substances because the atoms are not chemically joined
what are separation techniques
filtration, evaporation, chromatography, separating funnel, distillation, magnets
what do you use filtration for
to separate solids from liquids
what is evaporation used for
to recover a solute from a solvent
what is chromatography
a separation technique used to separate small amounts of soluble substances
why are liquids immiscble
there is a difference in densities
what do different liquids have
different boiling points
