CHapter 10: Properties of Gases (Definitions) Flashcards
1
Q
Define a gas
4
A
- a gas is a substance
- that has no well-defined boundaries
- but diffuses rapidly
- to fill any container in which it is placed
2
Q
What is added to degrees Celsius to convert it to degrees Kelvin
(1)
A
-273 is added to degrees celsius
3
Q
What is normal atmospheric pressure in pascals/kilopascals
2
A
- 1x10[5]Pa
- 100kPa
4
Q
What is 1 Litre in decimetres
1
A
1L=1 cubic decimetre (dm3)
5
Q
What is standard temperature
1
A
273K
6
Q
What is standard pressure
2
A
- 1x10[5]Pa
- 100kPa
7
Q
What does Boyle’s Law state?
4
A
- at constant temperature
- the volume of a fixed mass of gas
- is inversely proportional
- to its pressure
8
Q
How do you express Boyle’s Law mathematically?
1
A
pV=k
9
Q
What does Charles’ Law state?
5
A
- at constant pressure
- the volume of a fixed mass of gas
- is directly proportional
- to its temperature
- measured on the Kelvin scale
10
Q
How do you express Charles’ Law mathematically?
1
A
V/T=k
11
Q
How do you expressed the combined gas law mathematically?
1
A
P[1]V[1]/T[1]=P[2]V[2]/T[2]
12
Q
What does Gay Lussac’s Law of Combining Volumes state
5
A
- in a reaction between gases
- the volumes of the reacting gases
- and the volumes of any gaseous products
- are in the ratio of small whole numbers
- provided the volumes are measured at the same temperature and pressure
13
Q
What does Avogadro’s Law state?
5
A
- that equal volumes of gases
- contain equal numbers
- of molecules
- under the same conditions
- of temperature and pressure
14
Q
At s.t.p what volume does a gas occupy?
1
A
22.4 Litres
15
Q
What is an ideal gas?
4
A
- one that perfectly obeys
- all the assumptions of
- the kinetic theory of gases
- under all conditions of temperature and pressure
