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Description
Flashcards by Jaweria Khalid, updated more than 1 year ago
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Created by Jaweria Khalid
about 7 years ago
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| Question | Answer |
| What are the three forms of state? | Solid, Liquid and Gas. |
| What affects the state something is in? (What determines if it is a solid, liquid or gas?) | The state that something is in in at a certain temperature is dependant on how strong the forces of attraction are between the particles of the materials. |
| Name of the model used to describe how particles behave: | Particle Model. You can use the PM to explain how the particles in a material behave in each state of matter by considering each particle as a small, solid, inelastic sphere. |
| Properties of solids: | Solids have strong forces of attraction between particles which gives them their closeness and fixed positions to form a lattice arrangement. The particles DO NOT move so have a definite shape and volume. However particles can vibrate. |
| Properties of Liquids: | Weaker forces of attraction (than solids) and are randomly arranged therefore free to move past each other, but particles are close together. They have a definite volume but not shape. They flow to take the shape of the container. Particles are constantly moving with random motion. The hotter it gets the more the particles move and slight expansion. |
| Properties of Gases: | Gas particles are separate and there is no attraction between them. The particles in gases travel in straight lines. Gases do not keep a fixed shape or volume and will fit nay container. The particles move constantly with random motion. The hotter the gas gets, the faster they move. Gases either expand or increase in pressure when heated. |
| What is particle theory? | Particle Theory is a model used to explain the three states of matter. However it has many limitations. |
| Limitations to using the particle model? | - It shows all particles in a substance as the same size. (Variation in size) - Particles aren't solid or inelastic and they are not spheres they are atoms, ions or molecules. - Does not show forces between particles. |
| How do substances change from one state to another? | Solid - Melts (Liquid) Liquids - Boils (Gases) Gas - Condensing (Liquid) Liquid - Freezes (Solids) These are called physical changes. |
| How can you reverse physical changes? | By heating or cooling |
| What are chemical reactions? | During chemical reactions, bonds are broken and atoms change place. The atoms you start the reaction with (Reactants) rearrange themselves to from different chemicals. These new chemicals are called products. |
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