compounds and formulae Flashcards
1
Q
define ‘molecule’
A
two or more atoms chemically joined together
2
Q
define ‘compound’
A
two or more different elements chemically joined together
3
Q
what does a chemical formula tell you?
A
the names of the elements in a molecule, and the number of atoms of each element
4
Q
what is a pure substance?
A
a pure substance consists only of one element or one compound
5
Q
what is a subscript?
A
a small number written to the right of a chemical symbol which states how many atoms of that element are present.
6
Q
define ‘element’
A
substance composed of only one type of atom
