physical and chemical changes objective 4 teks 8a marivel macias
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Physical and ChemicalChanges
Objective 4
TEKS 8A
Marivel Macias
Chemical Change
• The elements and/or compounds at the start of the reaction are rearranged into new product(s) (i.e. compounds or elements).
Oxidation of Iron - a chemical change:
• For example iron has the potential to rust given the right conditions. This is a chemical property.
• If iron does rust, this is a slow chemical change since rust is an iron oxide with different properties than iron metal.
Iron + oxygen + water Iron rust.
Physical Change• A physical change
takes place without any changes in molecular composition.
• The same element or compound is present before, during and after the change.
Changes in States - a physical change:
• The three states of matter are: solid, liquid, and gas.
Digestion : Physical or Chemical Change?
• Identify the following:– Biting an apple– Chewing – Swallowing– Break down of
carbohydrates in stomach, small intestine and large intestine.
Rock Cycle: Physical or Chemical Changes?
Physical or Chemical Change?
Physical or Chemical Change?
• Phase Change– From liquid
water to gas vapor
• Boiling Point– 100 degrees
Celsius at 1 atm
Physical or Chemical Change?
• Dry Ice Sublimation
• carbon dioxide (s) carbon dioxide (g)
Physical or Chemical Change?
Plus Heat Energy
Physical or Chemical Change?
Iodine + Zinc Zinc Iodide