1. Chemical & Physical Changes
Created by:
Mrs. Dube

2. Characteristic Properties
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Physical properties describe a substance!
Physical properties are the characteristics of a substance that can be observed without changing the identity of the substance.
All of your senses can be used to detect physical properties.

3. Physical Properties (copy all)
Color
Shape
Size
Texture
Volume
Mass
Density
Boiling point
Melting point
Freezing point
Solubility

4. Physical Properties Copy into notes!
Physical properties of a substance are independent of the amount of the sample. (copy into notes)
For example, the boiling point of water is 212°F or 100°C whether you have a gallon of water or a cup of water.
Density of lead will always be 11,300 kg/m3 and the density of gold will always be 19,300 kg/m3

5. Physical Changes Copy into notes!
After a physical change, the substance is still the same substance
Changes in state are physical changes
The substance may have some different properties after a physical change

6. Physical Changes Copy into notes!
Physical changes in matter include:
Cutting, tearing, folding
Melting, boiling, freezing
Evaporating
Sublimating
Changes in states of matter
Creation of a mixture
Creating solutions
Breaking

7. Chemical Properties Copy into notes!
Burning
Rusting
Corrosion
Radiation
Oxidation
Flammability
Reacts with water
Reacts with air
Reacts with acid

8. Reactants and Products Copy into notes!
Reactants are the substances present at the beginning of a chemical reaction
Products are the substances formed by a chemical reaction present at the end of a chemical reaction

9. Chemical Changes “aka” Chemical Reactions (Copy into notes!)
Chemical changes are also known as chemical reactions
A change that produces one or more new substances is a chemical change or a chemical reaction

10. Chemical Changes: Breaking down Water
Electrolysis of water is an example of a chemical change that water undergoes
Water is broken down into hydrogen and oxygen using an electric current to break the bonds

11. Chemical Reactions (Copy into notes)
A chemical reaction produces new substances by changing the way in which the atoms are arranged
New arrangements of atoms form different substances

12. Evidence of Chemical Reactions (Copy into notes)
Color change
Formation of a precipitate (a solid product)
Formation of a gas (sometimes seen as bubbles)
Temperature change
Production of odor

13. Check for Understanding
Restate the question in your answer in your notes!
How do reactants differ from products?
How can you tell that a chemical reaction has occurred?