Physical/Chemical Change
What is chemistry?
The study of properties of matter and how matter changes.
What did French scientist Antonie Lavoiser discover after experimenting with measuring mass before and after chemical changes?
The law of conservation of mass.
What is energy?
The ability to do work or cause change.
What is temperature?
The measure of the average energy of all of the particles in an object.
What is thermal energy?
The total energy of all the particles in an object.
What are the two main types of change?
Physical & Chemical.
What is the law of conservation of mass?
It states that matter is not created or destroyed during a chemical reaction.
What does every chemical or physical change in matter include?
A change in energy.
Warm air particles have a higher?
Energy than cold particles.
How does thermal energy flow?
From hot to cold objects.
What is physical change?
Any change that alters the from or appearance but does not make the substances into a different substance.
What happens when matter changes?
Thermal energy is usually released or absorbed.
What is a chemical change?
One that produces or more new substances.
What are changes in matter that absorb energy called?
Endothermic changes.
What are changes in matter that release energy called?
Exothermic Change.