unit 3: element compound mixture stuff Flashcards
element
cannot be split into two or more substances by chemical reactions
made of only ONE type of atom
atoms of each element is diff from atoms of any other element
compound
- substance made up of two or more elements chemically combined together in a FIXED ratio, have a fixed composition
- can only be broken down through chemical methods
- different properties from that of its constituent elements
- formed by chemical reactions
solution
- kind of mixture
- homogeneous (composition is uniform throughout)
- solid dissolves completely, no solid particles can be seen
- physical is same as solvent
- solute cannot be filtered out of solvent
- the solution is transparent
solute
substance that dissolves in solvent, usually solid
solvent
substance that dissolves the solute, usually liquid
what affects solubility?
- type of solvent
- type of solute
- temperature of solvent
what affects rate of dissolving?
- temperature of solvent
- surface area of solute
- rate of stirring
what is solubility (definition)
solubility is the maximum mass of solute that can dissolve in fixed volume of solvent at fixed temperature
suspension
-type of moisture
- solid particles are insoluble
- solid particles can be seen in suspension
- heterogeneous mixture (solid is unevenly distributed in liquid, mixture is not the same throughout)
- when left to stand, solid particles settle to bottom
which is impure?
a) element
b) compound
c) mixture
C. mixtures are impure
pure substances melt/boil at fixed temps. but impure substances melt/boil at a range of temps.
are compounds proportionate?
yes. the substances in a compound are in fixed ratios
which only has one kind of atom?
a) compound
b) element
c) mixture
B.
An element is made up of only one type of atom
