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1.3 Density and Gas Laws

1.3 Density and Gas Laws. DENSITY. Density is the relationship of mass to volume. It describes how tightly the atoms and molecules of a substance are packed together. Density. D = M / V M = DV V = M / D M - Mass : g , kg V - Volume : cm 3, L D - Density : g/cm 3 , g /L

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1.3 Density and Gas Laws

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  1. 1.3 Density and Gas Laws

  2. DENSITY • Density is the relationship of mass to volume. • It describes how tightly the atoms and molecules of a substance are packed together.

  3. Density D = M / V M = DV V = M / D M - Mass: g, kg V - Volume: cm3, L D - Density: g/cm3, g/L kg/cm3, kg/L…

  4. Density Example If a sample of zinc has a mass of 25.4 g and its volume is 12.3 cm3. What is the density of the sample? E: d = m/v W: d = 25.4 g / 12.3 cm3 AU: d = 2.07 g/cm3

  5. Boyle Law • Boyles Law shows the relationship between pressure (how tight a gas is packed) and volume (how much space an object takes up). • It is an inverse or indirect relationship. As the pressure increases the volume decreases…

  6. Boyles’ Law (inverse) P1V1 = P2V2 Pressure*Volume = Pressure*Volume Before After P – kPa, atm, V – cm3, L, To solve – multiply together and divide. P V P V =

  7. Boyles’ Law Example Hydrogen is stored at 1.3 atm in a 3 L container. If it were to be released into a 50 L container, what would the pressure be? E: P1V1 = P2V2 W: 1.3atm * 3L = P2 atm * 50 L AU: 0.078 atm

  8. Charles’ Law • Charles’ Law shows the relationship between volume and temperature. • It is a direct relationship. • As volume increases, temperature increases…

  9. Charles’ Law (Direct) Before = After Volume = Volume Temp Temp V - L, cm3… T – K (to convert from C to K, add 273) To solve – multiply diagonal and divide V T =

  10. Charles’ Example Balloons at 300 K have a volume of 2.5 L. If the temperature is increased to 500 K, what volume would they occupy? E: W: 2.5 L = V2 L 300K 500K AU: 4.17 L

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