1. Identify physical and chemical changes, and understand the differences between them.

Physical changes produce no new substances- the substance undergoing change may have a different shape or state but is the same substance at the end.  Physical changes are concerned with change in states of matter. Examples: boiling water, melting ice, breaking a bottle, crumbling paper.

Chemical changes produce a new substance and either absorbs or releases heat during the process. Chemical changes happen on an atomic level. Examples: burning wood, dissolving salt in water, digesting food.

 

Notes submitted by Lintha

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9 thoughts on “C3.1 – Physical and Chemical Changes

  1. 2 Understand that some chemical reactions can be reversed by changing the reaction conditions (Limited to the effects of heat and water on hydrated and anhydrous copper(II) sulfate and
    cobalt(II) chloride.) (Concept of equilibrium is not required.)

    Can you guys make notes for this pointer?

    Like

    1. Hiya,
      Our notes are actually currently based on the 2017-18 syllabus, and the above point isn’t present there. We do hope to update our notes to match the new syllabus by the end of January, though! I apologise for any inconvenience caused. 🙂

      Like

  2. hey, I just wanted to let you know that dissolving salt in water is a physical change, not chemical. In chemical changes new substances are formed, which is not the case of dissolving salt in water. Your notes rock tho! thanks for blessing us with them.

    Liked by 1 person

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