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Unit 1 Lesson 2
Changes to Matter
| Question | Answer |
|---|---|
| What is a change in matter that does not change what the object is? | Physical Change |
| What are some examples of physical changes? | tearing up a piece of paper and melting or freezing water. The paper is still paper after it has been torn and the water is still water, whether it is frozen or not. |
| What changes the matter into a new substance? | Chemical Change |
| What are some examples of chemical changes? | lighting a piece of wood on fire, metal rusting, baking a cake, breaking of a glow stick, putting a balloon over a mixture of vinegar and baking soda |
| What is a combination of substances that can be physically separated? For example, a salad. | mixture |
| What is one way to separate a mixture? | a mixture of iron filings and sand can be separated by the use of a magnet to pull the iron filings out |
| What states that an object has the same mass or weight even when it goes through a change? | The law of conservation of mass |
| Heat changing a solid to a liquid is called? | melting |
| Heat changing a liquid to a gas is called? | evaporation |
| Liquid cooling and changing to a solid is called? | freezing |
| A gas cooling and changing to a liquid is called? | condensation |
| What causes water droplets on the outside of a glass? | Condensation - The warm air hits the cold glass and condensates into a liquid. |
| A cup of water might weigh _________ after heating because some of the water has ________________ . | less evaporated |
| What is another example to separate a mixture? | a mixture of salt and water can be separated by boiling away the water until it becomes water vapor and all that is left is the salt. Finally you can use a strainer to trap solid pieces from a liquid mixture. |
Created by:
rleblanc33
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