Measuring gases

Question 1

gas

Answer 1

a state of matter with no fixed shape or volume and which fills the space avaliable

Question 2

properties of gas

Answer 2

low density, unfixed volume and shape, easily compressable, mix readily with other gases

Question 3

ideal gas

Answer 3

a substance assumed to be composed of molecules of negligable volume and with no intermolecular interactions of exchange of energy when a collision occurs

Question 4

pressure

Answer 4

the force exerted by on the walls of the container enclosing it

Question 5

what is pressure reliant on

Answer 5

the temperatue, volume and mole of the gas, the molar mass of the gas does not effect pressutre

Question 6

mmHg

Answer 6

millimetres of Hg (mercury)

Question 7

Kpa

Answer 7

kiloppascals

Question 8

pa

Answer 8

pascals

Question 9

atm

Answer 9

atmospheres of pressutre

Question 10

100 Kpa is how many atm

Answer 10

0.987

Question 11

100 Kpa is how many mmHg

Answer 11

750

Question 12

1 atm is how many Kpa

Answer 12

101.3

Question 13

absolute zero

Answer 13

the temperature at which the moolecules in a substance have zero kinetic energy, which means that it is not possible to remove any more energy from it

Question 14

to convert celcius to kelvin

Answer 14

+273

Question 15

kelvin unit

Answer 15

represented by T, unit is K

Question 16

equation to calculate pressure/volume/moles/Temp (non-standard conditions)

Answer 16

PV=nRT

Question 17

PV=nRT worded equation

Answer 17

Pressure (Kpa) x Volume (L) = moles x Universal gas constant (8.31 J/mol/K) x Temperature (K)

Question 18

what are the standard lab conditions

Answer 18

25°C, 100KPa

Question 19

SLC stands for

Answer 19

standard lab conditions

Question 20

molar volume

Answer 20

the amount of volume occupied by 1 mole of any gas at a particular temperature and pressure

Question 21

Vm

Answer 21

molar volume

Question 22

equation to find molar volume/volume/moles at SLC

Answer 22

n=V/Vm

Question 23

n=V/Vm worded equation

Answer 23

moles= Volume of gas (L)/ molar volume at SLC (Lmol-1)

Question 24

kinetic molar theory

Answer 24

model to explain the properties of a gas based on the behaviour of the particles of teh gas

Question 25

how do gas particles move

Answer 25

rapidly in random, straight line motion

Question 26

pressure equation with force and area

Answer 26

Pressure (Nm-2 / 1 Pa) = forrce (N)/area(m2)

Question 27

partial pressure

Answer 27

the pressure exerted by 1 gas in a mixture if gases

Question 28

GHG

Answer 28

greenhouse gases

Question 29

greenhouse gases

Answer 29

gases that have the property of being able to absorb and re-emit infrared radiation

Question 30

the process of ghg's absorbing and re-emitting infrared

Answer 30

1. infrared radiation hits a molecule of ghg and causes the bonds to vibrate and bend at a greater rate 2. the molecule then re-emits this infrared heat in all directions, with some escaping into space, butless than would have escaped if ghgs werent present 3. this results in some of the suns heat energy becoming trapped in the lower atmosphere

Question 31

global warming potential

Answer 31

a measure of how mmmuch energy the emissions of 1 ton of gas will absorb over a given period of time, relative to 1 ton of carbon dioxide

Question 32

the larger the gwp...

Answer 32

the more that the given gas warms the earth coompared to CO2 in a given time period (usually 100 years)

Question 33

the greenhouse effect

Answer 33

a natural process that warms the earths surface, it allows life to exist on earth (otherwise average temperature would be -18)

Question 34

how does a greenhouse work

Answer 34

1. short wavelenths from the sun have a lot of energy so are strong enough to pass through gllass 2. once the suns radiation touches an object, the short wavelength turns into a long wavelength 3. the long wavelength has less energy and cannot pass back through thr glass

Question 35

enhanced greenhouse effect

Answer 35

human induced, is a result of burning fossil fuels and clearing of land that has incresed the amount og ghg's in the atmosphere, hence more heat being trapped

Question 36

causes of an increase in greenhouse gases

Answer 36

fires and deforestation, industrialisation, agriculture - practices and animal husbandry

Question 37

how does fires aaand deforestation contribute to imcreased ghg's

Answer 37

CO2 is released and the removal of trees means less absorbtion of CO2

Question 38

how does industrialisation cayse increased GHG;s

Answer 38

release of CO2 equivalent chemicals and ohotochemical smog

Question 39

how does agriculture practices increae GHg

Answer 39

fuels release CO2, fertilisers release N2O

Question 40

how does animal husbandry (agriculture) contribute to GHG's

Answer 40

increase in catttle which results in an increase in methane