Physical and Chemical change Flashcards
(4 cards)
1
Q
Define a physical change as in which?
A
No new substances are formed.
Energy changes are small in relation to chemical changes.
Mass, numbers of atoms and molecules as being conserved.
2
Q
Define a chemical change as in which?
A
New chemical substances are formed.
Energy changes are much larger than those of the physical change.
Mass and atoms are conserved, but the number of molecules is not.
3
Q
What is an endothermic reaction?
A
Energy is absorbed during the reaction.
4
Q
What is a exothermic reaction?
A
Energy is released during the reaction.
