Air Flashcards
(32 cards)
Nitrogen, oxygen, noble gases, water vapour, CO2
78, 21, 0.9, 0.07, 0.03
Oxygen
Colourless. Odourless. Burns burning splint more brightly. Relights glowing splint. No change for hydorgencarbonate indicator or limewater
Carbon dioxide.
Colourless. Odourless. Burning splint goes out. Glowing splint goes out. Red to yellow for hydrogencarbonate indicator. Colourless to milky for limewater
Dry cobalt chloride paper in desiccator
Just here
chemical equation for photosynthesis
6CO2+6H2O —–light absorbed by chlorophyll —-> C6H12O6+6O2
word equation for photosynthesis
carbon dioxide + water—–light absorbed by chlorophyll —-> glucose + oxygen
Iodine solution in presence of starch
Brown to blue-black
Procedure for testing starch
- Put leaf in boiling water – destroy cell membrane
- Put leaf in hot alcohol – remove chlorophyll from leave
- Wash leaf in hot water – remove alcohol and make leaf soft.
- Add iodine solution – test for presence of starch
What powder gives carbon dioxide
Sodium hydorgencarbonate powder
Destarch process
Placing it in the dark for at least 48 hours. All starch stored in leaves is converted into glucose which is then used by the plant.
Why destarch?
Ensures leaves do not contain any starch when investigation begins. Any starch we detect later is formed during the investigation, indicating that photosynthesis has taken place.
Soda lime
Absorb carbon dioxide
Which three are necessary for photosynthesis
Chlorophyll, light and carbon dioxide.
Significance of photosynthesis
- Providing food for living things
- Maintaining the balance of oxygen and carbon dioxide in nature
Respiration defintiion
In our bodies, the chemical energy in food is converted into other useful forms by a process similar to burning.
Word equation for respiration?
glucose + oxygen —- energy released —> carbon dioxide + water
Chemical equation for respiration
C6H12O6 + 6O2 —- energy released —-> 6Co2 + 6H2o
Hydrogencarbonate indicator showing change in CO2 content
> 0.03% = yellow
=0.03% = red
<0.03% = purple
Net gas exchange in plants in the day
rate of photosynthesis > respiration
- net uptake of co2
- net release of o2
net gas exhange in plants in the night
only respiration takes place.
- net uptake of o2
- net release of co2
inhaled air’s oxygen, co2, wate vapour and temp
oxygen: 21%
co2: 0.03%
water vapour: variable
temp: lower
exhaled air’s oxygen, co2, water vapour and temp
oxygen: 16%
co2: 4%
water vapour: saturated
temp: higher
human breathing system
nasal cavity - trachea - bronchus - bronchiole - air sac
intercostal muscle, rib, lungs, diaphragm
gas exchange at air sacs
oxygen passes from the air sacs into blood capillaries. the blood then carries oxygen to the body cells for respiration.
carbon dioxide is produced during respiration. it is carried by blood flowing to the lungs. carbon dioxide passes from the blood into the air sacs. it is then breathed out.
