10A - Pressure and Gases

Question 1

Def: What is is pressure? What is Gas Pressure? What is the generic formula?

Answer 1

Gas pressure is the force of collisions that take place btw gas particles and an object.
P = F/A

Question 2

Def: Define Atmospheric Pressure?

Answer 2

Pressure exerted by the mass of air above the earth in the atmosphere.

Question 3

Theory: What is the standard atmospheric pressure in atm. What is the relationship between atmosphere and mmHg.

Answer 3

1 atm.
1 atm = 760 mmHg.

Question 4

Theory: What is the relationship btw Torr and mmHg.

Answer 4

1 Torr = 1 mmHg.

Question 5

Def: What is SI unit of pressure.

Answer 5

1 Pa = 1 N/m^2 = 1 kg/m*s^2

Question 6

Theory: What is the relationship between bar, kPa, and atm.

Answer 6

1.01325 bar = 101325 kPa = 1 atm

Question 7

Theory: Why can pressure be measure in mmHg?

Answer 7

atm pushes Hg up tube. When weight of Hg balances atm pressure, we get 1 atm = 760 mmHg.

Question 8

Def: What is STP and SATP/RTP?

Answer 8

STP: 1 bar, 273.15 K (0 C)
SATP: 1 bar, 298.15 K (25 C)

Question 9

Theory: What are the five properties of gases?

Answer 9

1. Expand to fill container volume.
2. Highly compressible.
3. No phase separation in mixtures due to weak interactions between molecules.
4. At RTP, gaseous substances can be molecular or molecules.
5. Varying physical properties, including odor color and toxicity.