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Description
Flashcards by Deleted user, updated more than 1 year ago
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Created by Farha Idrees
over 6 years ago
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Copied by Farha Idrees
over 6 years ago
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| Question | Answer |
| _____ is needed to melt a solid or boil a liquid. | ENERGY is needed to melt a solid or boil a liquid. |
| For any pure substance undergoing a change of state, its temperature: | stays the same while the change of state takes place |
| What changes of state happen at a substance's: a) melting point b) boiling point | a) melting + freezing b) boiling + condensation |
| What affects the melting and boiling point of a liquid? | any impurities in the substance |
| Give an example of the previous statement | the melting point of water is lowered if you add salt to the water |
| What happens during the horizontal lines (whilst the temperature stays the same)? | the extra heat added does not affect the temperature, but rather goes to overcoming the forces of attraction between particles |
| What is latent heat? | the energy transferred to a substance when it changes state- its 'hidden' by the substance because the temperature does not change at its melting/boiling point |
| Explain what fusion is. | it is sometimes used to describe melting because different solids can be 'fused' together when they melt |
| Compare evaporation and boiling | evaporation; happens at any temperature and at the surface of the liquid ≠ boiling; at the boiling point, when bubbles of vapour form inside the liquid + rise to the surface to release the gas |
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