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JLC 4th Grade Sci Ch
JLC 4th Grade Science Chapter 11 Changes in Matter
| Question | Answer |
|---|---|
| What is an atom? | The smallest possible particle of an element |
| Describe the meaning of a compound? | A substance made of two or more kinds of atoms that are chemically combined. |
| What is an element? | A substance made of just one kind of atom. |
| What is a change of state? | A physical change that occurs when matter changes from one state to another. |
| Describe a chemical change. | A change that results in the formation of new substance. |
| What is a physical property? | A trait of a substance by itself. |
| Describe a physical change. | A change that does not result in a new substance. |
| Which property involves how a substance interacts with other substances? | chemical property |
| Name a common physical property of nonmetal. | brittle |
| Name a chemical property of a substance. | reacts with oxygen |
| Examples of elements. | iron, gold, silver |
| Example of chemical reaction | Hydrogen and oxygen combine to form water. |
| What happens when something is boiling? | water changes to gas when heated |
| An example of matter. | paper |
| examples of compounds. | salt, sulfur dioxide, water |
| You heat a solid and at 52 degrees C it melts and turns to liquid. Predict: What will happen when the liquid cools below 52 degree C? | The liquid will change back into a solid as it reaches freezing point. |
| You mix metal shavings that are magnetic with powder Then separate the metal shavings from powder with a magnet. Explain if a chemical reaction did or did not take place? | The properties of the metal stayed the same and the two substances did not react to form a new substance. |
| Is a spoonful of salt is dissolved in a glass of water a physical or chemical change? Explain | When the water evaporates just salt remains in the same state as before being mixed with water. A chemical change would make a new substance. |
| What do you predict would happen if you put an iron nail in a bottle with water for a few days? | Oxygen and water would cause the nail to rust |
| What do you predict will occur if you place an iron nail in a container with just air? | Oxygen alone does not cause a nail to rust. |
Created by:
lvalenti
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