PHYSCIAL CHANGES When a substance changes form or state. (although the substance remains the same) ‏ Example: The chocolate dip ice cream cone. LIQUID.

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Presentation transcript:

PHYSCIAL CHANGES When a substance changes form or state. (although the substance remains the same) ‏ Example: The chocolate dip ice cream cone. LIQUID (chocolate) ‏ SOLID (chocolate) ‏ TRY TO COME UP WITH OTHER EXAMPLES OF PHYSICAL CHANGE

CHANGES OF STATE SOLID LIQUID GAS melting freezing (solidification) ‏ vaporization (evaporation) ‏ condensation sublimation Can you think of examples???

CHEMICAL PROPERTIES Describes the ability of a substance to react with another substance to form one or more new substances (chemical reactions) ‏ 1.combustibility - the ability of a substance to burn in air ex. hairspray, propane (very combustible) ‏ 2. reaction with water/ oxygen / acids ex. gold does not react quickly with oxygen silver oxidizes (tarnishes) with oxygen

CHEMICAL CHANGES When a substance is changed into one or more different substances that have different properties. Example: combustion – burning propane (C 3 H 8 ) ‏ O2O2 +C3H8C3H8 CO 2 +H2OH2O light/ heat + REACTANTSPRODUCTS CHEMICAL EQUATION

Chemical reactions which r elease energy (i.e. feel hotter) are called: EXOTHERMIC REACTIONS Chemical reactions which a bsorb energy (i.e. feel colder) are called: ENDOTHERMIC REACTIONS

IDENTIFYING A CHEMICAL CHANGE Colour change ( note: does not always mean a chemical change has occurred ) ‏ 2. Heat or light is produced

3. Bubbles/gas are formed. A solid material ( precipitate ) forms in a liquid. 5. The change is difficult to reverse.

BURNING CANDLE Physical or chemical change? Burning wick (chemical) ‏ Melting wax (physical) ‏ dripping wax (physical) ‏