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Description
Flashcards by hosseinashamloo, updated more than 1 year ago
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Created by hosseinashamloo
almost 9 years ago
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| Question | Answer |
| States of Matter | Solid, Liquid and Gas |
| Solid | A solid has a fixed shape and a fixed volume. A strong force is must be applied to the solid in order to alter its shape. |
| Liquid | A liquid has a fixed volume but not a fixed shape. A liquid can flow and take shape of any container. |
| Gas | A gas has no fixed shape or volume. A gas can spread in all directions and can fill any container. |
| Boiling Point | The boiling point of a liquid is the temperature at which it rapidly changes into a gas. |
| Melting Point | The melting point of a solid is the temperature at which it changes into a liquid. |
| Freezing Point | The freezing point of a liquid is the temperature at which it changes back into a solid. |
| The Particle Theory | For centuries, scientists believe that all kinds of matter are constructed by tiny particles which are in constant motion. They also believe there are forces of attraction, holding the particles together and these forces vary in the different states of matter. |
| Atom | The smallest particle of a chemical element that can exist. There are different types of atoms and they can be found in all types of matter. |
| Molecule | Molecules are groups of two or more atoms that are joined together. |
| Solid Particles | The atoms or molecules in a solid are held closely together by strong forces of attraction. The particles cannot move over each other but can vibrate back and forth. |
| Liquid Particles | The forces of attraction between the atoms or molecules in a liquid is weaker than the attractions between solids. The particles are slightly further apart and can move around each other. |
| Gas Particles | There are only weak forces of attraction between the atoms or molecules of a gas. The particles are very far apart and can move about in all directions. |
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