Lesson 3
Change of appearance
What are physical changes of matter
A physical property of matter is any property that can be observed or measured without changing the chemical identity of a substance.
A physical change is a change that affects one or more physical properties of a substance.The appearance, shape, or size of a substance may be altered during a physical change.
Changes of a state, and all physical changes, do not change the chemical make up of the substance, an example of a physical change happens when you feel an ice cube tray with water and place it inside a freezer.
What are chemical changes of matter?
A chemical change occurs when one or more substances chenge into an entirely new substance with different properties.
Chemical changes are not exactly the same as chemical properties. Burning is a chemical change, and flammability is a chemical property.
Indicators of chemical changes
Some indicators are:
- Production of an odor:
- Production of gas
- Formation of a precipitate
- Change in energy
- Change in color
