earths oxygen cycle
The oxygen cycle is an example of the _______ cycle.
The oxygen cycle is an example of the biogeochemical cycle.
All animals need constant supply of ________
oxygen
????
subtract 100
A soap molecule has a
hydrophilic head and a hydrophobic tail
Is the Haber process exothermic?
Yes, the Haber process is exothermic. This implies that when the temperature is increased, the equilibrium of the reaction moves to its left. Hence, the amount of ammonia produced decreases.
Oxygen from the atmosphere is used up in processes, namely
Oxygen from the atmosphere is used up in combustion, respiration and the form of oxides of nitrogen.
Earthworms use their __________ for gas exchange.
skin
How does the Sun affect carbon?
As sunlight changes so does the amount of carbon that plants and ecosystems absorb from or release to the air.
in a diamond, each carbon atom is bonded to four other carbon atoms to form
a rigid three-dimensional structure
Hydrogen to be used for Haber’s process is mostly obtained from
Methane
The atmosphere contains ________ of oxygen.
21 per cent
Carbon dioxide tends to __________ out of animal cells.
diffuse
How hot is the Sun?
5,772 K
???
add 200
Pick the correct equation for the formation of ammonia by reaction with hydrogen.
In the oxygen cycle, the movement of oxygen takes place within
In the oxygen cycle, the movement of oxygen takes place within the atmosphere, biosphere, and lithosphere.
Extra ________ make the lungs of mammals very efficient.
pockets
does the sun need carbon to produce energy?
yes it relies on carbon, nitrogen, and oxygen (C, N, and O) to do so.
Why does carbon form compounds mainly by covalent bonding?
any of these answer
There are four electrons in the outermost shell of carbon.
It requires a large amount of energy to form C4+.
It shares its valence electrons to complete its octet.
Ammonia is used majorly in:
. What is a biogeochemical cycle?
The biogeochemical cycle refers to the movement of matter from the atmosphere through a series of intricate processes.
Cellular _________ is the process by which cells release the energy in digested food molecules
respiration
What two minerals is the sun made out of?
Hydrogen makes up about 92% helium makes up about 7.8%. Oxygen, carbon, neon, and nitrogen make up most of the remaining 0.2%.
Which of the following statements is correct for carbon compounds?
(ii) and (iii)
Which of the given metals can be used in the manufacturing of ammonia?