C3 Flashcards
1
Q
What is Mr?
A
relative atomic mass of all the atoms in the molecular formula added together
2
Q
What is Ar?
A
the relative atomic mass of an individual element.
3
Q
What does the mole mean?
A
Amount of a substance
4
Q
What is the formula for the number of moles?
A
mass in g (of an element/compound) /
Mr (of the element/compound)
5
Q
What is always conserved in chemical reactions?
A
mass
6
Q
What happens to atoms in chemical equations?
A
atoms are never created or destroyed