3.1 Chemical Measurements Flashcards
1
Q
What is the law of conservation of mass?
A
No atoms are lost or made during a chemical reaction
Mass of products = Mass of reactants
(number of atoms of each element on both sides must be the exact same)
2
Q
What is relative formula mass?
A
Sum of relative atomic masses of atoms shown in the formula
e.g. HCl
Mr= 1 +35.5 =36.5
3
Q
What happens to Mr in a balanced chemical equation?
A
No change to MR, sum of reactants is equal to products
4
Q
What can cause a change in mass after a reaction?
A
Reactant or a product such as a gas bot being accounted for e.g. gas released into atmosphere
