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1.3 Density and Gas LawsPowerPoint Presentation

1.3 Density and Gas Laws

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### 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: cm3, L

D - Density: g/cm3, g/L

kg/cm3, kg/L…

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

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…

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

=

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

Charles’ Law

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

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

=

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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