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Description
Flashcards by raneem alammar, updated more than 1 year ago
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Created by raneem alammar
over 7 years ago
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| Question | Answer |
| What are the states have? | Each of the states of matter has its own characteristic properties that can be explained using a simple model called the particle model. |
| Why are the model used in science ? | Scientists often use model to test or explain something that is difficult to understand . |
| What is an analogy ? | The heart is often compared with a water pump this simple type of model is known as an analogy . |
| Give two example of an analogy? | Like a pump , and like the heart. |
| What are everything made of in the particle model? | In the particle model , all substances are thought to be made of incredibly small , hard balls called particals. |
| What are thout models and how do scientists use them ? | "Thought" models help scientists imagine objects and events that are difficult to understand . |
| What is the difference between good and bad thought models ? | Good scientific thought models are always supported by lots of scientific observations and evidence. Bad thought models are quickly dismissed because they don't have much real behind them. |
| What is the particle model? | The properties model is a "thought " model that attempts to explain the properties of substances. |
| Whate are the 4 things that the properties model assumes ? | 1) all substances are made up of tiny particles that are too small to see even with a normal microscop. 2) Even if it is a very small amount , the particles always have energy and are moving . 3) the particles move about more and move faster as temperature is increased. 4) the closer the particles are to one another,the stronger the attraction between them. |
| What are bonds? | Forces between neighbouring particles form bonds that hold all the particles in the solid . |
| What do particles in a solid do ? | The particles in a solid are closely packed in fixed positions, together. |
| What happens when you increase the temperature in a solid? | If you increase the yemperature , this gives the particles more energy and so they vibration more . |
| What are the properties of solids ? | 1) a fixed shape and does not fow. 2) incompressible. 3) expand ( get larger) when heated and contract ( get smaller) when cooled. |
| How the partical model explains the physical properties of solids ? | *The particles are strongly bonded to their nieghbours, fixing their position. * the particles cannot be pushed closer to each other because they are so closely packed that there is almost no space between them. * Heating causes the particles to vibrate faster ,making them spread further apart and causing the solid to expand . cooling slows down vibration and the opposite happens. |
| What are the properties of liquids? | Flow to take the shape of the bottom of their container. * incompressible. * expand when heated and contract when cooled. |
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