When you light your Bunsen burner in lab, you are carrying out a chemical reaction that produces water and carbon dioxide. You could refreeze the water into ice, but you cannot put your hair back together if you don’t like your haircut!Ħ Physical Change? Look for these key words:ĭissolve Solubility Melt Freeze Evaporate Cut Inflate Paint Absorb Condense Sublimateħ CHEMICAL PROPERTIES Chemical properties can ONLY be observed AS the substances are changing into different substances.Ĩ FLAMMABILITY: A material’s ability to BURN in the presence of OXYGENĩ REACTIVITY: How readily (easily) a substance combines chemically with other substances.ġ0 Chemical changes, or chemical reactions, are changes that result in the production of another substance.ġ1 Common examples of chemical changes that you may be somewhat familiar with are digestion, respiration, photosynthesis, burning, and decomposition.ġ2 When you burn a log in a fireplace, you are carrying out a chemical reaction that releases carbon. Some, but not all physical changes can be reversed. A physical property is an aspect of matter that can be observed or measured without changing its chemical composition. Cutting a large piece of paper – you just have smaller pieces of paperĥ Some, but not all physical changes can be reversed painting your nails will not stop them from being fingernails. If you melt a block of ice, you still have H2O at the end of the change.ģ Some common examples of physical changes are: melting, freezing, condensing, breaking, crushing, cutting, and bending.Ĥ Examples: break a bottle - you still have glassĮxamples: break a bottle - you still have glass. For example, hydrogen reacts with oxygen to. Presentation on theme: "Chemical Properties & Physical and Chemical Changes"- Presentation transcript:ġ Chemical Properties & Physical and Chemical ChangesĢ Physical changes are those changes that do not result in the production of a new substance. A chemical change is any change that results in the formation of new chemical substances with new properties.
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