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Presentation On Physical And Chemical Changes

Home > PowerPoint Slides > Presentation On Physical And Chemical Changes
Published in: Chemistry | Science
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This PPT is suitable for the IGCSE and O Level Chemistry students. It only provides theoretical background of the topic. The practice questions, worksheets and topical questions will be discussed during the tutoring sessions

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  1. Physical and Chemical Changes Chemistry (IGCSE / O-Level)
  2. What will you learn in this lesson? Identifying physical and chemical changes, and describe the differences between them
  3. Physical Changes A change in the physical state of the substance or the physical nature of a substance that does not involve substance(s) present a change in the chemical Folding Melting Paper Breaking Glass Chopping Wood Mixing Shredding Candies Pa er Cutting Dry Ice Sublimation Hair Boiling Water Breaking Egg
  4. Physical Changes (contd.) • In physical change, the substances present remain chemically the same: no new substances are formed • Physical changes are often easy to reverse. Any mixtures produced are usually easy to separate Can you give any example of physically changed mixtures?
  5. Physical Changes (contd.) Physical changes can involve heat energy Heating Curve Evaporation / 150 Bo iling 100 Melting Cooling Curve Energy Released Condensation by particles (exothermic changes) reezmg C Energy Absorbed by particles (endothermic chan es t 5 10 15 20 25 Time (s) 30 35
  6. Chemical Changes A change in which a new substance are formed as a result of chemical reaction Burning wood Digestion Notting fruit Souring Milk Baking a cake E*éloding Fireworks Rusting metal Cooking an egg Using a Battery Photosynthesis
  7. Chemical Changes (contd.) • The major feature of the change is that new substance(s) are formed • Many reactions, but not all of them, are difficult to reverse • During a chemical reaction, energy can be given out (exothermic change) or taken in (endothermic change) • There are many more exothermic reactions than endothermic reactions
  8. Practice Questions 1 2 3 State whether the following changes are physical or chemical: a rn@lüng of ice b burning of magnesium c evaporation of ethanol d dissolving of sugar in water. State whether the following changes are exothermic or endothermic: a condensation of steam to water b burning of magnesium c addition of concentrated sülfuric acid to water d evaporation of a volatile liquid. What is the most important thing that shows us that a chemical reaction has taken place?

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