Introduction to Physical and Chemical Changes

Megan M.
16 words 102 learners

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  1. endothermic reaction
    a chemical reaction accompanied by the absorption of heat
    When heat is absorbed in a chemical change or reaction, it is called an endothermic reaction.
  2. exothermic reaction
    a chemical reaction accompanied by the evolution of heat
    When heat is given off in a chemical change or reaction, it is called an exothermic reaction.
  3. exothermic
    occurring or formed with the release of heat
    When heat is given off in a chemical change or reaction, it is called an exothermic reaction.
  4. endothermic
    occurring or formed with absorption of heat
    When heat is absorbed in a chemical change or reaction, it is called an endothermic reaction.
  5. chemical reaction
    a process in which substances are changed into others
    In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
  6. chemical change
    process determined by substances' composition and structure
    Physical and Chemical Changes
    When you have finished this page, try the Chemical and Physical Changes Quiz
    There are several differences between a physical and chemical change in matter or substances.
  7. freezing point
    the temperature below which a liquid turns into a solid
    Ice is formed when water is cooled to the freezing point.
  8. evaporate
    change into gas or steam
    If one decided to mix sugar into water to make sugar water, this would be a physical change as the water could be left out to evaporate and the sugar crystals would remain.
  9. chemical
    produced by reactions involving atomic or molecular changes
    Physical and Chemical Changes
    When you have finished this page, try the Chemical and Physical Changes Quiz
    There are several differences between a physical and chemical change in matter or substances.
  10. reaction
    an idea evoked by some experience
    In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
  11. catalyst
    substance that initiates or accelerates a chemical reaction
    Sometimes substances called catalysts are used to speed up or help along a chemical reaction.
  12. boiling point
    the temperature at which a liquid boils at sea level
    It is formed when water is heated to the boiling point or it evaporates.
  13. vapor
    a visible suspension in the air of particles of a substance
    Physical Change in Water
    steam animation

    faucet dripping animation

    ice animation
    Water as steam or water vapor.
  14. physical
    involving the body as distinguished from the mind or spirit
    Physical and Chemical Changes
    When you have finished this page, try the Chemical and Physical Changes Quiz
    There are several differences between a physical and chemical change in matter or substances.
  15. liquid
    fluid matter having no fixed shape but a fixed volume
    For example, a cup of water can be frozen when cooled and then can be returned to a liquid form when heated.
  16. temperature
    the degree of hotness or coldness of a body or environment
    The speed at which chemical reactions take place depend on the temperature pressure and how concentrated the substances involved in the chemical reaction are.
Created on Mon Jun 11 18:43:59 EDT 2012

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