Coservation of Mass Flashcards
1
Q
What does conservation of mass mean?
A
No gain of mass during a reaction
2
Q
In a reaction, mass is always what?
A
Conserved
3
Q
Can atoms be created or destroyed during a chemical reaction?
A
NO, so atoms will always stay the same
4
Q
How can you check that no atoms are created or destroyed?
A
With a closed system (nothing comes out)
5
Q
Does the total mass change?
A
No, the total mass of the system before and after doesn’t change.
6
Q
Example; Copper sulfate reacts with sodium hydroxide to form insoluble copper hydroxide and the solution sodium sulfate.
A
CuSo4(aq) + 2NaOh(aq) —–> Cu(Oh)2(s) + Na2So4(aq)
As reactants and products can escape therefore the mass will stay the same throughout the experiment
BUT…
If the mass changes then its most likely that gas is included
