chpt 3 Flashcards
1
Q
Provide 4 examples of evidence that a chemical change hapend
A
energy change, colour change, odour, formation of gas
1
Q
what are the diffrence between endo and exothermic
A
endo: bonds are broken energy is absorbed
exo: bonds are formed energy is released
2
Q
Law of conservation of enrgy
A
enrgy cannot be created or deystroyed
3
Q
Law of conservation of mass
A
energy can be converted from one form to another
4
Q
What is a mole
A
moles are a unit to count atoms and molecules
