chem exam 8

Question 1

1. variation in pressure in Earth’s atmosphere creates wind, and changes in pressure that help us predict (multiple choice)

Answer 1

weather

Question 2

2. there are four basic properties of a gas sample: pressure (P), volume (V); temperature (T), and amount in
   (multiple choice)

Answer 2

moles

Question 3

3. human beings can survive for weeks without food, days without water, but only ___ without air

Answer 3

minuetes

Question 4

4. The average distance that a molecule in a jar travels between collisions is called?

Answer 4

Mean Free Path

Question 5

5. Fortunately, we live at the bottom of a vast ocean of air, held together to Earth by ____

Answer 5

Gravity

Question 6

6. The instrument used to measure atmosphere pressure is called ___

Answer 6

Barometer: instrument used to measure atmospheric pressure

Question 7

7. The process by which gas molecules spread out in response to a concentration gradient is called ___

Answer 7

Diffusion

Question 8

8. when the desired product of a chemical reaction is a gas, the gas is often collected by the ____ of water

Answer 8

displacement

Question 9

9. the SI unit of pressure, defined as 1N/m^2 is called

Answer 9

Pascal (Pa)

Question 10

10. According to Charles law, when air is heated, its volume increases, resulting in a lower ___

Answer 10

Density

Question 11

Matching 11.
Law that states for a constant number of particles at constant pressure, the volume of gas is proportional to its pressure

Answer 11

Charles Law

Question 12

Matching 12.
Law that states that the total pressure of a gas mixture is the sum of the partial pressure of its components

Answer 12

Dalton’s law

Question 13

Match 13.
Law states that at constant temperature and pressure, the volume of a gas is proportional to the number of particles

Answer 13

Avogadro’s Law

Question 14

Match 14.
Law states that for a constant number of Particles at constant temperature, the volume of gas is inversely proportional to its pressure

Answer 14

Boyle’s Law

Question 15

15. Fill in the blank
    We can use the ideal gas law in combination with mass measurements to calculate the molar mass of a ___

Answer 15

Unknown gas

Question 16

16. Fill in the blank
    The process by which gas escapes from a container into a vacuum through a small hole is called

Answer 16

Effusion

Question 17

17. Fill in the blank
    The partial pressure of a vapor in dynamic equilibrium with its liquid is called

Answer 17

Vapor pressure

Question 18

18. Fill in the blank
    The total pressure exerted by a gas depends on several factors including the concentration of gas particles in the sample; the lower the concentration the lower the ____

Answer 18

Pressure