1.2

Question 1

What are the four variables that describe the physical behavior of gases in a sample?

Answer 1

Pressure (P)
temperature (T)
volume (V)
amount (n)

Question 2

Define pressure?

Answer 2

results from the number of collisions per unit time on inside walls of container

Question 3

Express pressure

Answer 3

pressure = force/ area

Question 4

What are the units for pressure?

Answer 4

Pascals; which are Pa= N/m^2

Question 5

true or false: a straw sucks the liquid up

Answer 5

false;
sucking a straw decreases the internal pressure of the object, therefore in comparison the Fatm (the atmospheric force or pressure) is higher. Gas flows from high pressure to low pressure; when something is in its path it will push it along

Question 6

true or false; gas travels from high pressure to low pressure and when there is something in its way it will push it along

Answer 6

true

Question 7

What does a barometer measure?

Answer 7

measures the total atmospheric pressure

Question 8

what does a manometer measure?

Answer 8

measures the differences in pressure

Question 9

Describe how a barometer works?

Answer 9

at 760 mm the column of mercury exerts the same pressure on the mercury surface in the dish as the atmosphere does
PHg= Patm

Question 10

true or false the air pressure decreases with altitude?

Answer 10

true
(because pressure = force/ area; since the effect of the force of gravity decreases as you get further away from the surface of the earth thus air pressure decreases)

Question 11

air pressure at sea level (0 C)

• how much atm
• how much mmhg
• how much torr
• how much kPa

Answer 11

1 atm = 760 torr= 760 mmHg= 101.325 kPa

Question 12

1 atm = ? lb/in^2

Answer 12

14.7 lb/in^2

Question 13

1 torr = 1 mmHg = ? atm

Answer 13

1/760 atm

Question 14

state boyle’s law and the conditions

Answer 14

P ~ 1/V
at fixed: amount (n) and temperature (T)
k =PV

Question 15

why does P~ 1/V?

Answer 15

a decrease in volume of gas particles will result in an increased pressure because gas particles will hit the walls of the container more often
(think of a crushed balloon

Question 16

state charles law and its conditions

Answer 16

V ~T
at fixed: Pressure (P) and amount (n)
k= V/T

Question 17

Why does V~T?

Answer 17

to maintain the same amount of collisions (P) per area of high temperature, we need a large volume and vice versa; TO MAINTAIN PRESSURE

Question 18

what is absolute zero?

Answer 18

0 K = - 273.15 C

Question 19

state Gay- Lussac’s law and its conditions

Answer 19

P~ T
fixed: Volume(V) and amount (n)
k= P/T

Question 20

true or false: for every 10m below the surface pressure on lungs increase by 1 atm

Answer 20

true

Question 21

State Avogadro’s law and conditions

Answer 21

V~ n
at fixed: Temperature (T) and Pressure (P)
k= V/n

Question 22

Why is V~ n?

Answer 22

Increasing the amount(n) in a container will increase the amount of collisions on the walls of the container thus (P) pressure will increase in the same volume.
However to MAINTAIN ORIGINAL PRESSURE therefore the VOLUME MUST INCREASE, so that the same amount of particles will collide with the inside walls per area originally.

Question 23

true or false: equal volumes of gases 9at same T and P) contain the SAME NUMBER OF PARTICLES

Answer 23

TRUE