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Chemical Properties

Chemical Properties. Chemical Properties. Chemical properties describe a substance based on its ability to change into a new substance with different properties. Ex: wood burns to form ash and smoke Chemical properties cannot be observed with your senses.

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Chemical Properties

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  1. Chemical Properties

  2. Chemical Properties • Chemical properties describe a substance based on its ability to change into a new substance with different properties. • Ex: wood burns to form ash and smoke • Chemical properties cannot be observed with your senses. • Chemical properties aren’t as easy to observe as physical properties. • Examples of chemical properties: flammability and reactivity

  3. Characteristic Properties • The properties that are most useful in identifying a substance are its characteristic properties. • Remember the difference between physical and chemical properties. • Physical properties can be observed! (with your eyes!) IDENTITY OF SUBSTANCE DOES NOT CHANGE! • You can observe chemical properties only in situations in which the identity of the substance could change.

  4. Chemical Changes • A chemical change occurs when one or more substances are changed into entirely new substances with different properties. • You can observe chemical properties only when a chemical change might occur! • Examples of chem. changes: baking a cake rusting

  5. Clues to chemical changes • Color change • Fizzing or bubbling (gas production) • Heat • Production of light, sound, or odor. • Chemical changes are not usually reversible!

  6. Differences • Chemical and physical properties are different. How? • Can observe phys. properties w/out changing the identity of a substance. • Can observe chemical properties only in situations in which the identity of the substance changes. • Chemical changes can not be reversed, physical changes can be reversed.

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