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Density

Density. REMEMBER TO USE PLUS. A measure of how closely the mass of a substance is packed in a given volume Physical property Mass per unit of volume of a substance Density= mass (g) volume (cm³). What is it?.

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Density

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  1. Density REMEMBER TO USE PLUS

  2. A measure of how closely the mass of a substance is packed in a given volume • Physical property • Mass per unit of volume of a substance • Density= mass (g) volume (cm³) What is it?

  3. A substance has a volume of 2.0 cm₃ and a mass of 38.6 g. What is the density? • If 17g of brass occupy 2 cubic centimeters, what is the density? Try these problems M V D

  4. A substance has a volume of 2.0 cm₃ and a mass of 38.6 g. What is the density? • D=M/V • Mass=38.6g • Volume= 2 cm ₃ • D=38.6g/2cm ₃ • D=19.3 g/cm ₃ Answers

  5. 2. If 17g of brass occupy 2 cubic centimeters, what is the density? • D=M/V • Mass=17g • Volume=2 cm ₃ • D= 17g/2cm₃ • D=8.5g/cm₃ Answers

  6. Compare the density of a substance with the density of water (always 1) • Specific gravity= density of substance density of water • Example: specific gravity of steel = 7.8g/ cm₃ 1.0 g/ cm₃ = 7.8 (steel is 7.8 times more dense than water) - If the specific gravity is less than 1, the object floats! Specific gravity

  7. Density Blocks

  8. What will happen when a raw egg is placed in regular water? What will happen when it is placed in salt water? • What will happen when to a lemon and a lime if placed in water? • What will happen if the rind of the lemon and lime are removed and placed in water? So what’s going on?

  9. Egg in fresh water: an object that is more dense than water will sink • Egg is salt water: salt is more dense than regular water and it can hold up the egg • Salt ions bind with water molecules allowing the salt water to become more dense (increasing the amount of matter per space) So what’s going on?

  10. Lemon: floats • Lime: sinks • Lemon without rind: still floats • Lime without rind: still sinks • Mass of lemon: • Mass of lime: • Volume of lemon: • Volume of lime: Lemons and limes?

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