PHYSICAL & CHEMICAL CHANGE
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"Chemistry is about change." - Kotz
PHYSICAL CHANGE
Definition: the chemical identity of a substance is preserved even though it may have changed its physical state.
Application: An example of a physical change is the melting of ice producing liquid water.
CHEMICAL CHANGE
Definition: A change that involves the transformation of one or more substance into one or more different substances.
Application: The mixture of hydrogen gas and oxygen gas under certain conditions will produce water.
** CHEMICAL EQUATIONS
Definition: A written representation of a chemical reaction, showing the reactants and products, their physical states, and the direction in which the reaction proceeds.
TRY TO ANSWER THE FOLLOWING QUESTION:
* When camping in the mountains, you boil a pot of water on a campfire. What physical and chemical changes take place in this process??
WHich of these is a Chemical change?
a) The fuel in the campfire burns in air (combustion)
b) The firewood turns the color blue