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Changes in Matter
Chapter 2 Section 3 Physical Science
| question | answer |
|---|---|
| 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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