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Changes in Matter

Chapter 2 Section 3 Physical Science

Physical Change A change in a substance that does not change its identity.
Chemical Change A change in which one or more substances combine or break apart to form new substances.
Law of Conservation of Mass The principle that the total amount of matter is neither created or destroyed during a chemical or physical change.
Energy The ability to do work or cause change.
Temperature A measure of the average energy of motion of particles of a substance.
Thermal Energy The total potential and kinetic energy of the particles in an object.
Endothermic Change A change in which energy is taken in.
Exothermic Change A change in which energy is given off.
Why is the melting of an ice cube called a physical change? When an ice cube melts, it is still water.
Why is combustion classified as a chemical change? Combustion involves the rapid combination of a fuel with oxygen to produce new substances.
Identify three different kinds of physical change that could happen to a plastic spoon. bend the spoon, break it in pieces, and melt it.
Which of the following processes is not a physical change; drying wet clothes, cutting snowflakes out of paper, lighting a match from a matchbook? lighting a match is not a physical change.
What evidence would you look for to determine whether a chemical change has occurred? If a new substance is formed, a chemical change has occurred.
Why is the electrolysis of water classified as a chemical change but the freezing of water is not? in electrolysis, water is broken down into hydrogen and oxygen ,two different substances. When water freezes, it is the same substance, but in a different form.
Explain why the mass of a rusted nail would be greater than the mass of the nail before it rusted. Assume that all the rust is still attached to the nail. During rusting, oxygen in the air combines with iron in the nail. The rusted nail has atoms of oxygen that the nail did not have before it ruted.
What is thermal energy? Thermal energy is the total energy of all the particles in an object.
How can you tell whether one glass of water has more thermal energy than another, identical glass of water? If the temperatures are different, the glass of water with the higher temperature has the greater thermal energy.
How might you cause an endothermic chemical change to begin and keep going? You have to add thermal energy.
Created by: Tom Radeke
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