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Changes in matter

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  1. Changesinmatter Physical and Chemical Properties Physical and Chemical Changes Observable Features of Chemical Reactions

  2. Physical properties • used to identify substances • used to classify substances • used to determine effective building materials

  3. Examples of physical properties • Elasticity • Hardness • Durability • Texture • Shape • Boiling point • Freezing point • Melting point

  4. Chemical Properties • used to identify substances • used to classify substances • used to determine effective building materials • used to determine materials suitable in different environments

  5. Examples of chemical properties • Flammable • Non-flammable • Reacts with water • Doesn’t react with water • Corrosiveness • Toxicity • Combustibility

  6. Physical change • Physical changes………. • are concerned with states of matter • are concerned with energy • form no new substances • include changes in states of matter • Same beginning & ending materials

  7. Examples ofphysical changes • Crushing a can • Melting an ice cube • Breaking a bottle • Boiling water into steam • Forming clay into a sculpture Physical

  8. Chemical change • Chemical changes………. • happen on a molecular level • make new substances • have indicators that change has taken place • Different beginning & ending materials

  9. Examples ofchemical changes • Burning logs in a fire • Cooking an egg • Rusting an iron pan • Mixing soda with vinegar • Exploding fireworks Chemical

  10. Evidence ofchemical changes • Change in color • Change in odor • Energy given off (light, heat, sound) • Gas given off • Precipitate forms

  11. Reaction typesinvolving heat Exothermic reactions (heat is given off) Endothermic reactions (heat is taken in) Boom! Fizz!

  12. Chemical change rates • Rates are affected by…………. • Heating • Cooling • Stirring • Crushing • Concentration

  13. Conservation of matter • Matter – can’t be created or destroyed • Mass – can’t be created or destroyed

  14. Changes in matter • Matter has physical and chemical properties. • Matter can change physically & chemically. • Energy is involved in the changes. • Chemical reactions have observable features. • Matter is conserved in a chemical reaction.