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Get out your reading guide but don’t turn it in

Get out your reading guide but don’t turn it in. Agenda. AQOD. Name three physical properties. Go over reading guide Discuss physical and chemical properties HW: 2.2 Worksheet. Physical versus Chemical Properties. Unit II - Part 1 The study of matter. Reviewing MATTER.

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Get out your reading guide but don’t turn it in

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  1. Get out your reading guide but don’t turn it in Agenda AQOD Name three physical properties • Go over reading guide • Discuss physical and chemical properties • HW: 2.2 Worksheet

  2. Physical versus Chemical Properties Unit II - Part 1 The study of matter

  3. 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?

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

  5. 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

  6. Special Physical Properties • Melting point: the temperature at which a substance changes from a solid to a liquid at a given pressure water = 0oC • Boiling point: the temperature at which a substance changes from a liquid to a gas at a given pressure water = 100oC

  7. 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

  8. Video Clips • Basic Definition • https://www.youtube.com/watch?v=6WjBM-ZgysQ • Song • https://www.youtube.com/watch?v=uJOGy0dgmUU

  9. Density • Density is the amount of mass per unit of volume. • Density can be used to identify a substance. • The density of water is 1.0g/mL

  10. Density Calculations • Calculations: D = m/V = g/mL = g/cm3 • Ex: A cube has a mass of 2.8 g and occupies a volume of 3.67 ml. Would this object float or sink in water? Mass = 2.8 g Volume = 3.67 mL D = 2.8g/3.67 mL= 0.76 g/mL • This object would float in water because its density is less than water (1.0 g/mL).

  11. More Density Calculations • Ex: A liquid has a mass of 25.6 g and a volume of 31.6 mL. Use the table below to identify the substance. M=25.6 g V=31.6 mL D = 25.6 g/31.6 mL D= 0.81 g/mL The substance is ethanol.

  12. Density Video Clips • https://www.youtube.com/watch?v=VfMDC4guXZg

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