Phase Changes
The phase change from solid to liquid
What is melting?
A person is roller skating down the road.
Kinetic or Potential
What is kinetic energy?
The type of reaction happening in the engine is
What is combustion reaction?
A positive change in energy for a reaction is
What is an exothermic reaction?
Combustion reactions are always
This phase has the least amount of energy
What is a solid?
Mechanical energy is
What is kinetic energy?
In this step, the potential energy increase
What is Step 2 -- Compression?
Bond Breaking is
What is endothermic?
The two products that always form in a combustion reaction
What is CO2 and H2O?
The name of the point on a phase diagram where all three phases exist at the same time
What is the Triple Point?
The type of energy at point B is
What is both kinetic and potential?
In this step the energy in the engine resets to zero
What is Step 4 -- Exhaust?
An example of an exothermic reaction in everyday life is
What are hot hands?
The fuel in a combustion reaction must have
What are carbons and hydrogens only?
What happens to the energy of the system when a substance evaporates?
What is energy is absorbed into the system?
Between these two points, the energy of the system stays the same but is converted from potential to kinetic back to potential
What is A and G
In the Exhaust stroke, these byproducts are released out of the engine
What are carbon dioxide and water?
When you hold an exothermic system in your hand, it feels
What is hot?
The fuel in a combustion reaction needs to be in the presence of this to make the reaction work
What is oxygen?
Give an example of endothermic phase changes
What is vaporization, melting, or sublimation?
Two subcategories of potential energy are
What are chemical, nuclear, gravitational, or elastic energy?
What is intake, compression, combustion, and exhaust?
2H2O + 1359 kJ --> 2H2 + O2
This reaction is
What is endothermic?
The scientific law that explains where the energy in a combustion reaction goes is
What is the Law of Conservation of Energy?