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Physical versus Chemical Properties

Physical versus Chemical Properties. The study of matter. Reviewing MATTER. Matter: anything that has mass and takes up space Mass – the amount of matter in something Volume – the amount of space something occupies Which of the following is matter? A car? A box? You?.

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Physical versus Chemical Properties

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  1. Physical versus Chemical Properties The study of matter

  2. Reviewing MATTER • Matter: anything that has mass and takes up space • Mass – the amount of matter in something • Volume – the amount of space something occupies • Which of the following is matter? • A car? • A box? • You?

  3. What is a property? • Property: a characteristic of a substance that can be observed

  4. Physical Property Physical property: a property that can be observed without changing the identity of the substance. • Examples: • luster • malleability: the ability to be hammered into a thin sheet • ductility: the ability to be stretched into a wire • melting point • boiling point • density • solubility • specific heat

  5. Chemical Properties • Chemical property: a property that can only be observed by changing the identity of the substance • Examples: • flammability • ability to rust • reactivity with vinegar

  6. Chemical or Physical! Identify Flammability Color Melting Point Ability to Rust Malleability Luster pH Density Boiling Point Ductility Reactivity Shape

  7. Physical Change • This is a change that can be “undone” The material itself is the same before and after the change • State changes (melting, freezing, vaporizing, sublimating)

  8. Chemical Change Look For… • Color change? • Energy Absorbed/ Released? • Odor Change? • Production of Solid or Gas? • The substances present at the beginning of the change are not present at the end • Can not be easily reversed

  9. Chemical or Physical? Mixing Salt and Water Glass breaking Cutting Grass Hammering wood together Rotten Eggs Burning Candle Frying an Egg Fireworks Exploding Melting Butter Bleaching your hair

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