pure substances and mixtures Flashcards
(10 cards)
1
Q
what do elements contain?
A
only one type of atom
2
Q
what are compounds?
A
substance with two or more elements chemically bonded together
3
Q
what are mixtures made up of?
A
many elements / compounds physically mixed
4
Q
what is an example of a compound?
A
sodium chloride
5
Q
what is an example of a mixture?
A
air
6
Q
what sort of substance are elements?
A
pure substances
7
Q
what sort of substance are compounds?
A
pure substances
8
Q
what sort of substances are mixtures and why?
A
impure substances since their components are not in a fixed ratio and not chemically bonded
9
Q
what is the boiling and melting point for pure substances?
A
fixed
10
Q
what is the boiling and melting point for impure substances?
A
over a range of temperatures
