Flashcards
6.3 ; changes of state
Flashcards do conjunto (9)
- 1_____ is needed to melt a solid or boil a liquid.ENERGY is needed to melt a solid or boil a liquid.
- 2For any pure substance undergoing a change of state, its temperature:stays the same while the change of state takes place
- 3What changes of state happen at a substance's: a) melting point b) boiling pointa) melting + freezing
b) boiling + condensation - 4What affects the melting and boiling point of a liquid?any impurities in the substance
- 5Give an example of the previous statementthe melting point of water is lowered if you add salt to the water
- 6What 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
- 7What 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
- 8Explain what fusion is.it is sometimes used to describe melting because different solids can be 'fused' together when they melt
- 9Compare evaporation and boilingevaporation; 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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- O usuário eliminou as informações de disciplina FlashCards sobre 6.3 ; changes of state, criado por Usuário eliminado em 12-03-2018.
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- Criado por Farha Idrees · 26 nov 2017
- Copiado por Farha Idrees · 12 mar 2018
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