EL 6 Flashcards
1
Q
Why must equations balance?
A
Atoms are not created or destroyed in chemical reactions
2
Q
Why would a reaction not give 100% yield?
A
- SIDE REACTION MAY GIVE UNWANTED BY-PRODUCTS
- THE REACTION MAY NOT BE PURE
- SOME REACTANTS OR PRODUCTS MAY BE LEFT IN THE EXPERIMENTAL APPARATUS
3
Q
%yield =
A
(Actual amount (in g or mol) / theoretical) x 100
4
Q
75 % in grams
A
75g
5
Q
What is the substance involved in the percentage yield experiment?
A
Oxide of copper
