It would require 46434 calories of heat to boil 142 g of ammonia.
When a liquid changes form into a gas, the process is called vaporization. You can watch vaporization when you boil a pot of water. Vaporization happens in two ways: evaporation and boiling. Evaporation occurs when sunlight shines on water until it changes to vapor and rises into the air
To calculate the amount of heat required to boil 142 g of ammonia, NH3, we can use the formula:
Heat = mass x heat of vaporization
where the mass is 142 g and the heat of vaporization is 327 cal/g.
Therefore, the heat required to boil 142 g of ammonia is:
Heat = 142 g x 327 cal/g
Heat = 46434 cal
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Select the term that correctly describes a chemical reaction that favors one possible structural isomer over one or more other structural isomers. a. regioselective b. stereoselective c. regiogenic d. stereogenic
While structural isomers share the same molecular formula, their atoms are bonded differently. Stereoisomers share the same atomic configurations and chemical formulae. Thus, option A is correct.
What favours one possible structural isomer?The term "structural isomer," also known as a "constitutional isomer," refers to a group of two or more organic compounds that share the same chemical formula but have different structures.
Isomers are compounds that share the same molecular formula but differ in the way their atoms or groupings are arranged or oriented. Only the groups' spatial orientation within the molecule distinguishes them from one another.
The location of the methyl group varies between the two molecules below, despite having the same chemical formula.
Therefore, regioselective is the term that correctly describes a chemical reaction that favours one possible structural isomer over one or more other structural isomers.
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Why does 1M NaCl have a higher boiling point than water?
There are fewer water molecules withinside the vapor (i.e., decrease vapor stress) above the NaCl solution than withinside the vapor above natural water.
The boiling factor of the NaCl answer can be extra than the boiling factor of natural water. The boom withinside the boiling factor of a 1.00 m aqueous NaCl answer can be about two times as massive as that of the glucose or sucrose answer due to the fact 1 mol of NaCl produces 2 mol of dissolved ions. Hence a 1.00 m NaCl answer could have a boiling factor of approximately 101.02°C.The addition of any non-unstable solute (including salt, baking soda or sugar) to a liquid will reason a lower in that drinks vapor stress. A liquid will begin to boil while its vapor stress is identical to the atmospheric stress, so a decrease vapor stress method you want a better temperature to boil the water.
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are enzymes consumed in chemical reactions and cannot be used again.?
One of the key features of enzymes is that they are not consumed in chemical reactions and can be used again.
Enzymes are biological catalysts that accelerate chemical reactions by lowering the activation energy required for the reaction to occur. They are typically large, complex proteins that have a specific three-dimensional structure that allows them to interact with specific substrates, or reactants, in a particular chemical reaction.
Enzymes remain unchanged after a reaction, and can be used to catalyze the same reaction many times over. However, enzymes can be affected by changes in pH, temperature, or other environmental factors, which can alter their structure and affect their ability to catalyze reactions.
Enzymes are critical to many biological processes, including metabolism, digestion, and DNA replication. Without enzymes, many of these processes would occur too slowly to sustain life. Scientists have also developed ways to use enzymes in industrial processes, such as the production of biofuels and pharmaceuticals. The ability to use enzymes repeatedly in these applications makes them a valuable tool in the development of sustainable and efficient technologies.
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what is the composition in at% ag of an alloy that consists of 90.6 wt% ag and the remaining wt% cu? supply an answer that is rounded to the nearest 0.1 at%.
The composition in at% Ag of the alloy is 85.2%.
To calculate the atomic percentage (at%) of Ag in the alloy,
we need to know the atomic weights of both Ag and Cu.
The atomic weight of Ag is 107.87 g/mol, while the atomic weight of Cu is 63.55 g/mol.
First, we can calculate the weight percentage of Cu in the alloy:
90.6 wt% Ag + x wt% Cu = 100 wt%
x wt% Cu = 100 wt% - 90.6 wt% Ag = 9.4 wt% Cu
Next, we can convert the weight percentage of Cu to the atomic percentage of Cu:
9.4 wt% Cu * (1 mol Cu/63.55 g) * ([tex]6.02\times10^{23 }[/tex]atoms/mol) = 8.36 x [tex]10^{22}[/tex] atoms Cu
100 wt% - 9.4 wt% = 90.6 wt% Ag
90.6 wt% Ag * (1 mol Ag/107.87 g) * (6.02 x [tex]10^{23}[/tex] atoms/mol) = 4.81 x [tex]10^{23}[/tex]atoms Ag
Now we can calculate the atomic percentage of Ag:
at% Ag = (4.81 x [tex]10^{23}[/tex] atoms Ag) / (4.81 x [tex]10^{23}[/tex] atoms Ag + 8.36 x [tex]10^{22}[/tex]atoms Cu) * 100%
at% Ag = 85.2%
Therefore, the composition in at% Ag of the alloy is 85.2%. Rounded to the nearest 0.1 at%, the answer is 85.2 at% Ag.
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potassium-40 decays to argon-40 with a half-life of 1.25 billion years. how much of a 24-gram sample of potassium-40 sample will remain after 3.75 billion years
We can use the radioactive decay formula to determine how much of the 24-gram sample of potassium-40 will remain after 3.75 billion years:
[tex]N = N0 * (1/2)^(t/T)[/tex]
where: N0 is the initial amount of the radioactive substance
N is the final amount of the radioactive substance
t is the time that has passed
T is the half-life of the radioactive substance
Plugging in the given values, we get:
[tex]N = 24 g * (1/2)^(3.75)[/tex])billion years / 1.25 billion years)
[tex]N = 24 g * (1/2)^3[/tex]
[tex]N = 24 g * 0.125[/tex]
[tex]N = 3 g[/tex]
Therefore, after 3.75 billion years, only 3 grams of the 24-gram sample of potassium-40 will remain.
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a piece of silver of mass 362 g has a heat capacity at constant pressure of 85.7 j / 0c. what is the molar heat capacity at constant pressure of silver?
Silver has a 0.235 J/g°C specific heat.
The amount of energy needed to raise the temperature of a given mass of a substance by a certain quantity is measured by the substance's specific heat. In this issue, we are required to determine a piece of silver's specific heat given its mass and heat capacity.
According to the equation
specific heat = heat capacity/mass
specific heat = 85.7 J/°C / 362 g
Thus, 0.235 joules of energy are required to raise the temperature of 1 gm of silver by 1 degree Celsius. The thermal characteristics and behavior of a substance are significantly influenced by its specific heat.
Complete question:
A piece of silver of mass 362 g has a heat capacity of 85.7 J/°C. What is the specific heat of silver?
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2. the haber process is used to make ammonia on an industrial scale. if you want to produce 10 metric tons of ammonia, how would you calculate the mass of the reactants needed?
To produce 10 metric tons of ammonia using the Haber process, you would need approximately 8.23 metric tons of N2 and 0.79 metric tons of H2 as reactants.
What is the mass of the product?The mass of the reactants and products must match for a chemical reaction to occur. The products will therefore have the same mass if you start with a specific amount of mass and it interacts.
The Haber process is a well-known industrial process used to produce ammonia. To calculate the mass of reactants needed to produce 10 metric tons of ammonia using the Haber process,
The balanced chemical equation for the Haber process is: The Haber process requires about 8.23 metric tonnes of N2 and 0.79 metric tonnes of H2 as reactants to produce 10 metric tonnes of ammonia.
A well-known industrial procedure for creating ammonia is the Haber process. The balanced chemical equation for the Haber process is: The mass of reactants required to make 10 metric tonnes of ammonia using the Haber process is:
N2 (g) + 3 H2 (g) = 2 NH3 (g)
Therefore, you must determine how many moles of NH3 are needed to make 10 metric tonnes (10,000 kg) of ammonia:
2NH3 is produced by the following equation: N2 (g) + 3H2 (g) (g)
Number of moles of NH3 = 10,000,000 g / 17.03 g/mol = 587,459.3 mol
Since three moles of H2 are required to produce two moles of NH3, the number of moles of H2 required can be calculated as:
Number of moles of H2 = (2/3) x Number of moles of NH3
Number of moles of H2 = (2/3) x 587,459.3 mol = 391,639.5 mol
Similarly, the number of moles of N2 required can be calculated as:
Number of moles of N2 = (1/2) x Number of moles of NH3
Number of moles of N2 = (1/2) x 587,459.3 mol = 293,729.7 mol
Finally, the mass of each reactant can be calculated using their respective molar masses:
Mass of N2 = Number of moles of N2 x Molar mass of N2 = 293,729.7 mol x 28.02 g/mol = 8,228,236.9 g = 8.23 metric tons
Mass of H2 = Number of moles of H2 x Molar mass of H2 = 391,639.5 mol x 2.02 g/mol = 790,136.2 g = 0.79 metric tons.
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penicillin g, also known as benzylpenicillin, is an antibiotic. its chemical formula is c16h18n2o4s. what is the molecular mass of penicillin g? your answer should have six significant figures.
An antibiotic is penicillin G, sometimes referred to as benzylpenicillin. Its molecular structure is C16H18N4S. the molecular mass of penicillin G is 334.386 g/mol.
To calculate the molecular mass of penicillin G, we need to add the atomic masses of all the atoms in its chemical formula.
The atomic masses of each element are:
C: 12.011 g/mol
H: 1.008 g/mol
N: 14.007 g/mol
O: 15.999 g/mol
S: 32.06 g/mol
To calculate the molecular mass of penicillin G, we add the atomic masses of each element in the chemical formula:
Molecular mass = (16 x 12.011) + (18 x 1.008) + (2 x 14.007) + (4 x 15.999) + 32.06
Molecular mass = 334.386 g/mol
Therefore, the molecular mass of penicillin G is 334.386 g/mol.
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a mixture of helium and argon gas is expanded from a volume of to a volume of , while the pressure is held constant at . calculate the work done on the gas mixture. round your answer to significant digits, and be sure it has the correct sign (positive or negative).
When a mixture of helium and argon gas is expanded from a volume of to a volume of , while the pressure is held constant then work done on the gas will be W = -2.70 L atm .
To calculate the work done on the gas mixture, we can use the formula:
W = PΔV
where W is the work done, P is the constant pressure, and ΔV is the change in volume.
Assuming the initial volume of the gas mixture is V1 and the final volume is V2, and using the values given in the problem, we have:
ΔV = V2 - V1 = 9.50 L - 6.80 L = 2.70 L
Substituting this value along with the constant pressure of P = 1.00 atm, we get:
W = PΔV = (1.00 atm)(2.70 L) = 2.70 L atm
We should also consider the sign of the work done. Since the gas is expanding, the work done by the gas is negative (i.e., the system is doing work on the surroundings). Therefore, we need to assign a negative sign to the result:
W = -2.70 L atm (to two significant digits).
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a current of 4.96 a is passed through a ni(no3)2 solution. how long, in hours, would this current have to be applied to plate out 7.10 g of nickel?
Faraday's law of electrolysis, which states that the quantity of substance created or consumed in an electrolytic cell is precisely proportionate to the quantity of electric charge carried through the cell, must be applied to this problem.
We use the formula: moles of substance = (electric charge / Faraday's constant), where C/mol is the charge per mole of electrons and F/mol is the Faraday constant. We must first determine how many moles of nickel were created by the specified current in order to determine the time needed to plate out 7.10 g of nickel: Electric charge is calculated as electric charge = current x time. Using the molar mass of nickel (58.69 g/mol), determine its mass: [(4.96 x t) / 96485] x 58.69] x [(moles of Ni x molar mass of Ni] = mass of Ni Calculate "t" by equating the mass of nickel produced to 7.10 g and then solving for "t": t = (7.10 x 96485) / (4.96 x 58.69) = 16.6 hours. such that the current would require 16.6 hours of application to plate out 7.10 g of nickel.
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if some of the bubbles of butane did not enter the cylinder and escaped into the air instead, in what way would the calculated molecular weight of butane be affected?
The calculated molecular weight of butane would not be affected if some of the bubbles escaped into the air instead of entering the cylinder.
The molecular weight of a substance is a fundamental property of the substance and is determined by the number and type of atoms in its molecular structure. It is independent of the amount or physical state of the substance. Thus, if some of the bubbles of butane escape into the air, the molecular weight of the remaining butane in the cylinder remains unchanged. The effect of this escape would only be seen in the measured volume or mass of the butane in the cylinder, which would be lower than the expected value if all the butane had been captured.
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The volume occupied by 9.03×10^23 molecules of N2 gas at STP is closest to??A) 1.50 LB) .500 LC) 22.4 LD) 33.6 L
The volume of the N₂ gas at STP is 33,6 liter. 9,03 × 10²³ molecules of N2 gas equal 1,5 mol N₂.
Volume at STP or the molar volume for every gas at standard temperature and pressure is 22,4 liter/mol. To find out the volume of the N₂ gas at STP you can use the following steps:
Step 1: The first step you have to do is calculate the number of moles of the compound.
mol = number of particles ÷ Avogadro's number
= 9,03 × 10²² ÷ 6,02 × 10²³
= 9,03 ÷ 6,02
= 1,5 mol
Step 2: The next step is to calculate the volume of N₂ in the STP state
Volume N₂ = n × volume at STP
= 1,5 mol × 22,4 liter/mol
= 33,6 liter
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-Complete Solution.
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A car starts from rest and moves at the speed of 30km/h after half an hour. What is the car's acceleration?
The acceleration of the car, given that it started from rest and move with a speed of 30 Km/h in half hour is 60 Km/h²
How do I determine the acceleration of the car?Acceleration is defined as follow:
a = (v – u) / t
a is the acceleration v is the final velocity u is the initial velocity t is the timeThe following data were obtained from the question:
Initial velocity (u) = 0 Km/h Final velocity (v) = 30 mi/hrTime (t) = 1/2 hour = 0.5 hourAcceleration of car (a) =?The acceleration of the car can be obtained as follow:
a = (v – u) / t
a = (30 - 0) / 0.5
a = 30 / 0.5
a = 60 Km/h²
Thus, we can conclude from the above calculatuin that the acceleration of the car is 60 Km/h²
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how many tons of carbon (as carbon dioxide) are released into the air each year? group of answer choices ~20 thousand tons ~20 million tons ~20 billion tons ~20 trillion tons
20 billion tons of carbon (as carbon dioxide) are released into the air each year. So option c. is the correct answer.
Each year, human actions release more carbon dioxide into the atmosphere than natural cycles can deduct, resulting in the quantity of carbon dioxide in the atmosphere inflating. The global average carbon dioxide forms a new record high in 2021: 414.72 parts per million. Carbon dioxide concentrations are rising primarily because of the fossil fuel that people are burning for energy.
Fossil fuels like coal and oil contain carbon that plants removed out of the atmosphere through photosynthesis over multiple millions of years; we are reciprocating that carbon to the atmosphere in merely a few hundred.
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Transcribed Image Text:According to Beer-Lambert law, the absorbance of dye such as crystal violet is proportional to its Select one: temperature concentration transmittance Van't Hoff Factor
According to Beer-Lambert law, the absorbance of dye such as crystal violet is proportional to its molar concentration.
Beer-Lambert law says that, "there is a linear relationship between the absorbance of the solution and the concentration, which enables the concentration of a solution to be calculated by measuring its absorbance.
Beer Lambert law is basically used in chemistry to measure the concentration of chemical solutions, analyze oxidation, and measure polymer degradation. This law also explains the attenuation of radiation through the Earth's atmosphere.
The Beer-Lambert law is mathematically expressed as:
A = εLc
where,
A is the denotation for absorbance, ε is the molar extinction coefficient, l is the length of the path light which must travel in the solution in centimeters, and c is the concentration of a given solution.
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sodium (na) starts with 11 protons and 11 electrons. when sodium donates an electron, group of answer choices the valence shell (second shell) becomes complete. sodium will be attracted to positively charged ions. the sodium ion becomes negatively charge. sodium will be able to form nonpolar covalent bonds.
With 11 protons and 11 electrons, sodium (Na) is created. The valence shell, or second shell, of sodium is finished when an electron is donated. Hence, option 1 is correct answer.
The distribution of electrons among the many possible orbitals on an element's atom is known as its "electron configuration." The designations of the orbitals s, p, d, and f refer to groups of lines that were first detected in the spectra of the alkali metals. The sharp, primary, diffuse, and fundamental line groupings are among them.
The s-orbital, p-orbital, d-orbital, and f-orbital are among them. the first shell is known as the K shell because: Spectroscopist Charles G. Barkla gave the electron shells their names. As he observed that the X-rays produce two different sorts of energy, he gave the innermost shell the name K shell. He gave type A, higher energy, and type B, lower energy X-ray as additional names for those two energies.
The electron configuration of Sodium is
Na₁₁ = 1s² 2s² 2p⁶ 3s¹
When the sodium ion denotes 1 electron to another atom, then the electron configuration becomes,
Na⁺ = 1s² 2s² 2p⁶
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oil is insoluble in water. this is because of the differences in the polarity of the liquids, one is non polar and the other is polar. however, oil drops can be suspended in water to form a colloidal solution by adding --------------------------.
Oil can be suspended in water to form a colloidal solution by adding an emulsifier.
An emulsifier is a substance that helps to mix two otherwise immiscible liquids, such as oil and water, by reducing the surface tension between them. Common emulsifiers for oil and water include soap, detergent, and surfactant molecules. These molecules have one end that is attracted to the oil and one end that is attracted to the water, allowing them to hold the oil and water together in a stable mixture.
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Please explain how they got these answers?? Like step by step if u can. Please hurryyyyy 50 points
The frequency of a microwave that has a wavelength of 8.72 × 10-¹⁰m is 3.44 × 10¹⁷Hz.
How to calculate frequency?Wavelength is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.
The wavelength, λ, of a substance can be calculated as follows:
λ = v/f
According to this question, a microwave possesses a wavelength of 8.72 × 10-¹⁰m. The frequency can be calculated as follows:
f = v/λ
f = 3 × 10⁸ ÷ 8.72 × 10-¹⁰
f = 3.44 × 10¹⁷Hz
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what are the ultimate origins of coal, oil, and natural gas? which fuel is in greatest reserve abundance
Answer:
Coal, oil, and natural gas are all fossil fuels that were formed from the remains of plants and animals that lived millions of years ago.
Coal was formed from the remains of plants that grew in vast swamps and bogs during the Carboniferous period, about 300 million years ago. Over time, these plants were buried by sediment and subjected to heat and pressure, which transformed them into coal.
Oil and natural gas were formed from the remains of tiny marine organisms, such as plankton and algae, that lived in the oceans and seas hundreds of millions of years ago. When these organisms died, their remains sank to the bottom of the ocean and were buried by sediment. Over time, heat and pressure transformed the organic material into oil and natural gas.
In terms of reserve abundance, natural gas is currently in the greatest supply. According to the US Energy Information Administration (EIA), global natural gas reserves were estimated at 198 trillion cubic meters as of January 2022. This is followed by oil, with global reserves estimated at 1.73 trillion barrels, and coal, with global reserves estimated at 1.03 trillion short tons. However, it's important to note that the availability and distribution of these resources can vary widely by region, and factors such as extraction costs, market demand, and environmental regulations can all influence their commercial viability.
what causes the litmus to change from purple to pink?
Litmus is a type of dye that is extracted from lichens and is commonly used as a pH indicator. The color change from purple to pink indicates a change in the acidity or basicity of a solution.
In an acidic solution, the hydrogen ion (H+) concentration is high, which causes the litmus dye to change from its original blue color to red. In a neutral or basic solution, the hydrogen ion concentration is low, and the litmus dye remains blue. However, if the solution is sufficiently basic, the litmus dye will change from blue to pink. The exact mechanism of this color change is due to the chemical structure of the litmus dye, which contains a variety of functional groups that can interact with hydroxide ions (OH-) in a basic solution. This interaction causes a change in the electronic structure of the dye molecules, which results in a change in their absorption and transmission of light and, therefore, a change in color.
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Which one of the following can be classified as a nonelectrolyte?A) LiIO3B) Cl2C) NaID) KIOE) HI
The one of the following that can be classified as a nonelectrolyte is HI. Nonelectrolytes are molecules that do not dissociate in water and do not conduct electricity, which means that they do not contain ions.
HI is a molecular compound composed of hydrogen and iodine, so it does not dissociate in water and does not conduct electricity, making it a nonelectrolyte. A nonelectrolyte is a substance that does not dissociate into its component ions when dissolved in a solvent such as water. This means that it does not conduct electricity and does not form a solution in which the ions can move freely. Nonelectrolytes are usually molecular substances, such as sugar, alcohol, and hydrocarbons, that contain only non-polar covalent bonds. When these substances are dissolved in water, they remain as intact molecules and do not break down into ions.
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The following orbital notation is for which element?
The following orbital notation is for the element O (Oxygen).
What is an orbital notation?Orbital notation is a way to describe the electron configuration of an atom. It consists of a combination of symbols and numbers that represent the energy level, type of orbital, and the number of electrons contained in that orbital.
The notation uses the letter symbols "s," "p," "d," and "f" to represent the different types of orbitals, and a superscript to indicate the number of electrons in the orbital. For example, the orbital notation for a carbon atom is "1s2 2s2 2p2," indicating that there are two electrons in the 1s orbital, two electrons in the 2s orbital, and two electrons in the 2p orbital.
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what will happen when 100 ml of diethyl ether is added to 100 ml of water and thoroughly mixed? the temperature of the mixture will significantly increase. diethyl ether will form a separate layer on top of the water layer. water will form a separate layer on top of the diethyl ether layer. diethyl ether will fully dissolve in water. there will be a chemical reaction between diethyl ether and water.
Option (b) is correct. When 100ml of diethyl ether is added to 100ml of water and thoroughly mixed, the diethyl ether will form a separate layer on the top of the water layer due to Van der Waals forces.
When we mix diethyl ether and water, they do not mix. They would quickly separate out with the ether layer on top as it is less dense. This process is frequently used to separate the products of organic synthesis.- The product is more soluble in diethyl ether than water that is shaken with diethyl ether multiple times and the ether layers collected usually for further purification. Diethyl ether does not form hydrogen bonds and only has Van Der Waals forces between the molecules This will be referred to as Dipole-Dipole. Water cannot hydrogen bond to the diethyl ether molecules and has very weak van der waals forces and dipole-dipole forces it is bonded more strongly to itself than the diethyl ether. Diethyl ether molecules are bonded more strongly to each other. so they separate out into two layers.
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The complete question is ,
what will happen when 100 ml of diethyl ether is added to 100 ml of water and thoroughly mixed?
(a) the temperature of the mixture will significantly increase.
(b) diethyl ether will form a separate layer on top of the water layer.
(c) water will form a separate layer on top of the diethyl ether layer.
(d) diethyl ether will fully dissolve in water.
(e) there will be a chemical reaction between diethyl ether and water.
What amino acids are involved in hydrogen bonds?
A 145 mL flask contains argon at 1.3 atm and 65 ◦C. What amount of Ar is present? Answer in units of mol.
A 145 mL flask contains argon at 1.3 atm and 65 ◦C. 6.12g is the amount of Ar is present. 0.34mol is the amount of Ar is present.
What is argon?Argon is indeed a chemical element with the atomic number 18 and the symbol Ar. It is considered a noble gas and belongs to Periodic Group 18. [6] Argon, with 0.934%, is the third-most prevalent gas in the Earth's atmosphere (9340 ppm).
It is more than twice as plentiful than water vapor (which averages around 4000 ppm but fluctuates widely), 23 times as prevalent than carbon dioxide (400 ppm), as well as 500 times more abundant than neon (18 ppm).
P×V = n×R×T
1.3 ×145 = n×8.314× 65
n = 188.5 / 540.4 =0.34mol
mass = 0.34 ×18=6.12g
Therefore, 6.12g is the amount of Ar is present.
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5. What criteria are used to distinguish between a chemical change and a physical
change?
In chemical change, the chemical composition of substance changes while in physical changes the chemical composition remains the same.
What are chemical changes?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
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In the presence of oxygen, the enzyme TYROSINASE catalyzes the oxidation of DOPA (3,4-dihydroxyphenylalanine), producing dopaquinone. Dopaquinone spontaneously converts into dopachrome (a dark orange/brown molecule).
Here is a simple diagram that illustrates this reaction:
DOPA + O2 ⇒⇒⇒TYROSINASE⇒⇒⇒ Dopaquinone ≈ Dopachrome (orange/brown)
Which of the following statements best describes tyrosinase?
1. A product of an enzymatic reaction
2. A polypeptide chain with active sites that bind DOPA and Oxygen
3. A substrate that is converted to dopachrome
4. A coenzyme that binds to oxygen
5. An inhibitor that prevents oxidation
The statement that best describes tyrosinase is - 2. A polypeptide chain with active sites that bind DOPA and Oxygen.
Tyrosinase, an oxidase, is the enzyme that limits the rate at which melanin is produced. The Raper Mason pathway, which consists of two separate melanin production processes, is where the enzyme is mostly involved. First, a monophenol is hydroxylated, and then an o-diphenol is changed into the matching o-quinone. Melanin is finally formed by a series of processes involving o-Quinone. Tyrosinase is a copper-containing enzyme that catalyses the oxidation of tyrosine to produce melanin and other colours in plant and animal tissues. It can be found inside the melanosomes that the skin's melanocytes produce. The TYR gene in humans encodes the tyrosinase enzyme.
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colligative properties of solutions include all of the following except . question 10 options: depression of the freezing point of a solution upon addition of a solute to a solvent depression of vapor pressure upon addition of a solute to a solvent an increase in the osmotic pressure of a solution upon the addition of more solute the increase of reaction rates with increase in temperature elevation of the boiling point of a solution upon addition of a solute to a solvent
The increase in reaction rates with an increase in temperature is not a colligative property of a solution.
Freezing-point depression is the decrease of the freezing point of a solvent in addition to a non-volatile solute. It is a colligative property of the solution.
When a solute is added to a solvent, the area of the open surface of the solvent is decreased due to the presence of solute molecules. Hence, the vapor pressure of the solution is less than the vapor pressure of the pure solvent. Therefore, there is a depression of vapor pressure upon the addition of a solute to a solvent.
As the vapor pressure is decreased, the boiling point will be increased, as it would take more temperature to achieve the saturated vapor pressure. This leads to the elevation of the boiling point.
If more solute is added to a solvent, then the concentration gradient will be increased, which leads to an increase in osmotic pressure.
If the reaction is exothermic then the reaction rate decreases with the increase in temperature. But if the reaction is endothermic then the reaction rate increases with the increase in temperature. Hence, it is not a colligative property of solutions.
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What is the concentration of F2 (g), in parts per billion, in a solution that contains 4.8 * 10 ^ - 8 * g of F2 (g) dissolved in 9.6 * 10 ^ - 3 * g of H2O(l)?
A 50 ppb
B 5.0 x 10^2 ppb
C 5 ppb
D 5.0 x 10^3 ppb
Answer:
It's option D
Explanation:
13. what reactant combines with oxygen to form sulfur dioxide? where can this reactant be found in nature?
Sulfur dioxide (SO2) is typically formed by the combustion or oxidation of sulfur-containing materials. In the context of industrial processes, sulfur dioxide is commonly produced by burning sulfur-rich fuels such as coal and oil.
In nature, sulfur dioxide can also be formed by volcanic activity, as well as through the bacterial and chemical breakdown of organic matter that contains sulfur.Sulfur dioxide can be produced by the reaction of sulfur or sulfur-containing compounds with oxygen. For example, when sulfur is burned in the presence of oxygen, sulfur dioxide is formed according to the following reaction:
S (s) + O2 (g) → SO2 (g)
The reaction can also occur between sulfur compounds, such as hydrogen sulfide (H2S), and oxygen:
2 H2S (g) + 3 O2 (g) → 2 SO2 (g) + 2 H2O (g)
Sulfur dioxide is an important gas in the atmosphere, as it plays a role in regulating climate and air quality. However, high concentrations of sulfur dioxide can be harmful to human health and the environment, and so it is important to control and monitor its release into the environment.
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