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∙ 9y agoNADH is the primary electron and oxygen is the terminal electron acceptor in the aerobic
membrane bound electron transport chain. The overall electron transfer reactions can be
described by the reaction
2 NADH + 2H+ + O2 --> 2 NAD+ + 2 H2O
If the above reaction takes place in an aqueous solution at pH 7.6, at 25o C, with the
following steady state product and substrate concentrations: [NAD+] = 20.0 mM, [NADH]
= 10.0 mM, and oxygen at a partial pressure of 100.0 torr, calculate the free-energy change
for this oxidation of NADH by oxygen. The standard state for a gas is a pressure of 1 atm
or 760 torr. The biochemical standard state for hydrogen ion is pH 7, or 10-7 M. The
universal gas constant is 8.314472 J K-1mol-1. Standard Gibbs free energy change at pH 7.6
and 25 o C for the above reaction is -220.3 kJ mol-1. Zero degrees Celsius is equivalent to
273.15 degrees Kelvin.
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Question 2 on next page
2
Question 2. [10 marks]
A new strain of yeast is being considered for biomass production in a chemostat reactor.
2a) Sketch a typical chemostat reactor, and by using a simple material balance on the
limiting substrate in the absence of endogenous metabolism given as;
, prove that
where is the maintenance coefficient based on substrate S, is the
apparent yield, while is a constant.
2b) The following data were obtained using the reactor and the proven equation in (a)
above. An influent substrate concentration of 800 mg/L and an excess of oxygen were
used at a pH of 5.5 and T = 350C. Using the following data, calculate m, Ks, M
X S Y / , kd, and
ms, assuming d
s
m
net k
K S
S
Dilution
rate (h-1)
Carbon substrate
concentration (mg/L)
Cell concentration
(mg/L)
0.1 16.7 366
0.2 33.5 407
0.3 59.4 408
0.4 101 404
0.5 169 371
0.6 298 299
0.7 702 59
dt
dS
V
Y
V q X
Y
FS FS V X R
P S
M R P
X S
R g
/ /
0
1 1
D
m
Y Y
s
M
X S
AP
X S
/ /
1 1
M
X S
d
s Y
k
m
/
AP
X S Y /
M
X S Y /
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∙ 9y agoThe physical property of halite that supports the presence of ionic bonds is its cleavage. Halite has a perfect cubic cleavage due to the arrangement of sodium and chloride ions in a crystal lattice, indicating strong ionic bonding between the ions. The ionic bonding allows for the easy splitting along specific planes, resulting in the cubic cleavage observed in halite crystals.
The diagnostic property of halite is its salty taste. Halite is composed of sodium chloride, which is the chemical compound responsible for the salty taste. However, tasting minerals is not recommended due to potential health risks and the availability of other reliable methods for mineral identification.
Halite, or sodium chloride, is a colorless or white mineral with a glassy luster. It typically forms cubic crystals and has a hardness of 2.5 on the Mohs scale. Halite is water-soluble and has a salty taste.
Halite does not react with HCl.
Halite can scratch gypsum.
The dissolution of halite in rocks in water is a chemical weathering process. As water comes into contact with the halite mineral, it chemically reacts and breaks down the mineral into its component ions, leading to its dissolution. This process weakens the rock structure over time, causing physical breakdown as well.
The property that causes halite to break into cubes is its crystal structure. Halite crystals have a cubic shape, making them naturally cleave along planes that result in cubic shapes when broken. This property is known as cleavage.
Halite can be identified by its distinctive salty taste.
its salty
Halite is a mineral that is named for salt and is commonly known as rock salt. One special thing about halite is that its properties allow it to be used for food preservation as well as a treatment for roads during the winter.
The diagnostic property of halite is its salty taste. Halite is composed of sodium chloride, which is the chemical compound responsible for the salty taste. However, tasting minerals is not recommended due to potential health risks and the availability of other reliable methods for mineral identification.
No, halite is not clastic. Halite is a mineral that forms through the evaporation of water containing dissolved salt. Clastic refers to sedimentary rocks made up of fragments of pre-existing rocks.
Halite and pyrite are two separate minerals with distinct chemical compositions and crystal structures. Halite is the mineral form of sodium chloride, while pyrite is the mineral form of iron sulfide. They have different physical properties and appearances, so it is incorrect to call halite "pyrite."
Halite, or sodium chloride, is a colorless or white mineral with a glassy luster. It typically forms cubic crystals and has a hardness of 2.5 on the Mohs scale. Halite is water-soluble and has a salty taste.
Halite is a very soft mineral on the Mohs Hardness Scale. Generally around 2-2.5. The type of cleavage is cubic, meaning 3 directions at 90 degrees. A very diagnostic property is that it has a salty taste. Also halite tends to be transparent.
This tendency of halite to break apart in one of three directions is called cleavage. Cleavage is a property of minerals where they break along specific planes of weakness due to their crystal structure. In the case of halite, it exhibits cubic cleavage, which means it breaks into cube-shaped fragments when struck.
Halite has weaker chemical bonds compared to quartz. Halite is made up of ionic bonds between sodium and chloride ions, which are relatively weaker than the covalent bonds found in quartz. This difference in bond strength is reflected in the physical properties of the two minerals, with halite being softer and more easily broken than quartz.
what is the symbol for halite