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Chapter 12, Lesson 2

Matter changes in 2 ways: both Physically or Chemically
The identity of a substance in a physical change does not change
What is an example of a Physical Change? Ice forming on a lake
Changes in color, density, state of matter can be signs of chemical changes but not always
Chemical changes: form a gas, form a precipitate, change of color IF a new substance is formed
energy release (heat) sign that chemical change is involved
Many changes CAN NOT be reversed
Law of Conservation of Mass Mass is always conserved during physical and chemical changes
In a chemical change, the substances that make up matter change into other substances with different physical properties and chemical properties
solid definite shape and definite volume
solid molecules stay in one place and vibrate
liquid no definite shape, but does have a definite volume
gas no definite shape or volume
Physical Property characteristic of a material that you can see without changing the identity of the material
Weight gravitational pull on an object
Mass the amount of matter in an object
Density mass per unit volume of a substance
Solubility the ability of one material to dissolve in another
Boiling Point temperature that a liquid changes to a gas
Chemical Changes to a new substance, No reversing
Physical Changes senses, can be reversed
Examples of Chemical Changes: baking a cake, digesting food, rotting, rusting, burning
Examples of Physical Changes: melting, boiling, breaking, shredding, cutting
Created by: pechajoe