conservation of mass Flashcards
1
Q
what happens to atoms in a chemical reaction
A
no atoms are destroyed and no atoms are created
2
Q
show that the mass is conserved in this reaction : 2Li + F2 - 2LiF
A
Ar of Li = 7 Ar of F = 19 Mr of 2LiF = 2 X 26 =
Mr of 2Li = (2 X 7) = 14 Mr of F2 = 52
2 X 19 = 38
14 + 38 = 52
meaning both reactant and product are equal so mass is conserved
3
Q
Using balanced equation, show that mass is conserved in the following reaction:
H2SO4 + 2NaOH – Na2SO4 + 2H2O
A
(answer in book)
