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12 Cards in this Set
- Front
- Back
Describe a Solid |
Fixed volume and shape Cant be compressed |
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Describe a Liquid |
Fixed volume but change shape Can occupy more space than solids |
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Describe a Gas |
No fixed shape or volume Can be compressed |
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Describe the particle theory for a solid |
Particles dont move about. They are packed together and vibrate |
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Describe the particle theory for a liquid |
Particles close together but move past each other |
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Describe the particle theory for a gas |
Particles arent packed together Particles move about quickly |
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What happens at a substances melting point |
Solid to liquid. Enough energy is supplied to cause the vibrating particles to move |
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What happens at a substances boiling point |
Liquid to gas. As temperature increases, rate of evaporation increases |
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Are melting and boiling point reactions reversible? |
Yes |
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What is sublimation |
When a solid turns directly to gas, missing the liquid stage in an experiment |
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Why does the temperature of a substance remain constant at melting point |
Enough energy is supplied to the particles to break their bonds and as a result temp remains constant until all the bonds are broken and then it starts to rise again |
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What are the problem of the particle theory |
Assumes atoms are spheres with no empty space within them and dont vary in size. |