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Science
Chapter 12, Lesson 2
Question | Answer |
---|---|
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 |