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Phase Change and Density

Phase Change and Density. L.E.Q.: How does a substances density change when changing to a different state of matter?. What do you think?. On a piece of scratch paper write a hypothesis (if, then, because) for the following problem:

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Phase Change and Density

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  1. Phase Change and Density L.E.Q.: How does a substances density change when changing to a different state of matter?

  2. What do you think? • On a piece of scratch paper write a hypothesis (if, then, because) for the following problem: • What happens to density as phase changes from gas to liquid to solid? • Compare your hypothesis with your partner. Are they the same or different? Whose do you think is correct?

  3. Density and Phase Change • Remember that density is the MASS of matter divided by the VOLUME! • D = m/v • Which do you think takes up more space 100g of water or 100g of water vapor? • 100g of water vapor • Remember that gases have their molecules more “spread” out and therefore takes up more space!

  4. Calculate the density of water and water vapor • 100g of water has a volume of 100 mL…What is the density? • D=m/v • D = 100g/100mL • D = 1g/mL • 100g of water vapor has a volume of 120mL…What is the density? • D= 100g/120mL • D= 0.83 g/mL • Liquid has the higher density!

  5. Liquid to Solid Phase Change • What do you think happens to density as a liquid changes to a solid? Why? • Which takes up more space 100g of liquid gold or 100g of solid gold? Why do you think this? • Remember: In a solid the molecules are more compact (takes up less space)

  6. Calculate • 100g of liquid gold has a volume of 6.5mL. • D=m/v • D=100g/6.5mL • D=15.4g/mL • 100g of solid gold has a volume of 5.2mL • D=100g/5.2mL • D=19.3g/mL

  7. In General…. • In general what happens to density as we go from solid to liquid to gas? • As we go from solid to liquid to gas, density generally decreases (this is why gas floats on liquid and liquid floats on solid)

  8. EXCEPTION • What happens to water as it is frozen? • Why does ice float on water, why do soda cans crack in the freezer? • As water freezes it expands, making ice (solid) less dense than the liquid form!

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