5.1 Flashcards
1
Q
what is a molecule
A
a group of two or more atoms joined by a covalent bond
2
Q
what is the molecular formula of water
A
H2O
3
Q
what is the relative molecular mass of water
A
18
4
Q
what is the empirical formula
A
the smallest whole number ratio of the atoms of each element in a compound
5
Q
how do you calculate empirical formula
A
divide the mass of each element by its Mr
divide answers by the smallest answer
convert into whole number ratio
6
Q
define molecular formula
A
the actual number of the atoms of each element in a compound
7
Q
what is the difference between a relative formula mass and relative molecular mass
A
relative molecular mass can only be used for covalent molecules
