Answer:
1 mol of nitric acid consists of 6.022 ✕ 10²³ molecules of nitric acid. The above discussion suggests that 4.62 moles of nitric acid have 27.822 ✕ 10²³ molecules.
Answer:
2.78 × 10²⁴ molecules
Moles and Avogadro's Constant:In chemistry, a mole (in mol, denoted by symbol 'n') is a unit of measurement, where 1 mole = 6.022×10²³ of anything. This unit of measurement is designed to make calculations more convenient when dealing with atoms and molecules, which are very small.
Avogadro's Constant is the name given for the value of 6.022×10²³.
If one mole is 6.022×10²³ molecules, then the number of molecules (N) in 'n' number of moles is n × Avogadro's Constant (\(N_A\).) Therefore:
\(\boxed{\huge \textsf{$ N = n\times N_A$}}\)
So if we have 4.62 moles of HNO₃ (nitric acid), then:
\(\Large \textsf{$ N(\rm HNO_3) = 4.62\times 6.022\times 10^{23}$}\)
\(\boxed{\boxed{\huge \textsf{$ \therefore N(\rm HNO_3) = 2.78 \times 10^{24}\, molecules$}}}\)
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Strontium-89 undergoes beta decay, after 88 days a sample has decreased to 30% its original size. What is the half-life of sr-89?.
The half-life of sr-89 will be 51 days.
What is a Beta decay?In nuclear physics, beta decay is a type of radioactive decay in which an atomic nucleus emits a beta particle (a fast energetic electron or positron), which changes the original nuclide into an isobar of that nuclide. Prior to beta decay, neither the beta particle nor the associated (anti-)neutrino is present in the nucleus; instead, they are produced during the decay process. This procedure gives unstable atoms a protons-to-neutrons ratio that is more stable.The weak force, which is characterized by relatively slow decay durations, results in beta decay. Up and down quarks make up nucleons, and the weak force allows a quark to change the flavor of its lepton by emitting a W boson, which produces an electron/antineutrino or positron/neutrino pair.For instance, the disintegration of a neutron, which consists of two down quarks and an up quark, produces a proton, which consists of a down quark and two up quarks.Because the fundamental nuclear mechanism, mediated by the weak force, is the same, electron capture is occasionally considered a kind of beta decay. In electron capture, a proton in the nucleus captures an inner atomic electron, turning it into a neutron, and releasing an electron neutrino.To learn more about beta decay strontium-89 click here-
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What are the intermolecular forces between molecules in a liquid sample of sulfur trioxide, SO3?
The intermolecular forces between molecules in a liquid sample of sulfur trioxide, SO3 is London dispersion force.
What is intermolecular force?The electrostatic forces of attraction present between molecules which hold them together are termed as intermolecular force.
Types of intermolecular forceDipole dipole interactionDipole induced dipole interaction van-der waal interactionlondon dispersion forceWhat is london dispersion force?This type of forces arises between symmetrical non- polar molecules. At a particular instant of time, the symmetry of molecules break and become unsymmetric. One side contain more electron than other. Having more electron become negative and other side get negative.
This unsymmetry make neighbouring molecule unsymmetric. The weak dispersion bond is formed between molecules called london dispersion force.
Thus, intermolecular forces between molecules in a liquid sample of sulfur trioxide, SO3 is london dispersion force.
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Question 13
5 pts
For questions 10-13 refer to the following reaction:
2H₂ + O2-----> 2H₂O
If 10.0 g of H₂ reacts with 10.0 g of O2,
how many grams of excess reactant are remaining after the reaction goes
to completion?
When 10.0 g of H₂ reacts with 10.0 g of O₂, the limiting reactant is O₂, and 8.75 grams of excess H₂ are remaining after the reaction is complete.
In chemical reactions, reactants combine to form products. However, sometimes there may be an excess of one reactant, which means that it is present in greater quantity than required for a complete reaction with the other reactant.
In such cases, the excess reactant is not completely consumed and remains unused after the reaction reaches completion.
The balanced chemical equation given for the reaction is:
2H₂ + O₂ → 2H₂O
From the equation, we can see that 2 moles of hydrogen gas react with 1 mole of oxygen gas to produce 2 moles of water.
To find the number of moles of each reactant, we need to convert the given masses to moles using the molar mass of each substance. The molar mass of hydrogen gas (H₂) is 2 g/mol, and the molar mass of oxygen gas (O₂) is 32 g/mol.
For hydrogen gas (H₂):
Number of moles = Mass / Molar mass
Number of moles = 10.0 g / 2 g/mol
Number of moles = 5.0 mol
For oxygen gas (O₂):
Number of moles = Mass / Molar mass
Number of moles = 10.0 g / 32 g/mol
Number of moles = 0.3125 mol
From the balanced chemical equation, we can see that the ratio of hydrogen gas to oxygen gas is 2:1. Therefore, for a complete reaction, 2 moles of hydrogen gas react with 1 mole of oxygen gas.
Since the mole ratio is 2:1, we can conclude that oxygen gas is the limiting reactant because we have 0.3125 mol of oxygen gas, which is less than 5.0 mol of hydrogen gas.
Since 1 mole of oxygen reacts with 2 moles of hydrogen, we can determine the amount of hydrogen gas required by multiplying the number of moles of oxygen gas by 2:
Amount of hydrogen gas required = 2 * 0.3125 mol
Amount of hydrogen gas required = 0.625 mol
Since we have an excess of hydrogen gas (5.0 mol), we can subtract the amount of hydrogen gas required (0.625 mol) from the total amount of hydrogen gas (5.0 mol) to find the remaining excess:
Excess reactant remaining = Total amount of reactant - Amount of reactant required
Excess reactant remaining = 5.0 mol - 0.625 mol
Excess reactant remaining = 4.375 mol
To convert the remaining moles of hydrogen gas to grams, we can use the molar mass of hydrogen gas:
Mass of excess reactant remaining = Moles * Molar mass
Mass of excess reactant remaining = 4.375 mol * 2 g/mol
Mass of excess reactant remaining = 8.75 g
Therefore, after the reaction goes to completion, there will be approximately 8.75 grams of excess hydrogen gas remaining.
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Apply The axes in the coordinate grid at the right represent the walls of a bedroom. One corner of the room is at the origin. What is the distance from that corner of the room to the corner of the bed that is farthest away? if necessary, round to the nearest tenth of a foot.
SHOW WORK
The axes in the coordinate grid on the right represent the walls of a room. the distance from that corner of the room to the corner of the furthest bed is 11 axes. A coordinate grid has two perpendicular lines, or axes (pronounced AX-eez), labeled just like number lines. The horizontal axis is usually called the x-axis. The vertical axis is usually called the y-axis. The point where the x- and y-axis intersect is called the origin.
How many axes are in a coordinate system?The coordinate plane has two axes: the horizontal and vertical axes. These two axes intersect one another at a point called the origin.
What are the XY and Z axes?The x axis is in the plane of the screen and is positive toward the right and negative toward the left. The y axis is in the plane of the screen and is positive toward the top and negative toward the bottom. The z axis is perpendicular to the screen or keyboard, and is positive extending outward from the screen.
With this information, we can conclude that the distance from that corner of the room to the corner of the furthest bed is 11 axes.
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If you hold your breath, carbon dioxide will begin to build up in your blood and creates a desire to breathe. Which type of sensory receptor senses the change in blood carbon dioxide levels?
A) mechanoreceptor
B) nociceptor
C) photoreceptor
D) thermoreceptor
The type of sensory receptor that senses the change in blood carbon dioxide levels is a chemoreceptor. When we hold our breath, carbon dioxide begins to accumulate in the bloodstreams the correct option is A.
The body responds to this change by stimulating chemoreceptors, which are specialized sensory receptors located in the carotid arteries and aorta that detect changes in the chemical composition of the blood. Specifically, the chemoreceptors detect the increase in carbon dioxide levels and send signals to the brain, which in turn triggers the urge to breathe. This is an important feedback mechanism that helps to regulate breathing and ensure that the body receives adequate levels of oxygen and expels excess carbon dioxide.
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Full Question ;
Which type of sensory receptor senses the change in blood carbon dioxide levels?
a) chemoreceptor
b) mechanoreceptor
c) nociceptor
d) photoreceptor
e) thermoreceptor
over all spatial arrangement of atoms in a protein is called as secondary structure.select one:truefalse
The over all spatial arrangement of atoms in a protein is called secondary structure. This is false . it is called as conformation.
The over all spatial arrangement of atoms in a protein is called as conformation. The primary structure of protein is called as amino acid. the local spatial arrangement of the polypeptide chain is explained the secondary structure. the overall spatial arrangement is called as conformation. The native conformation is the conformation of functional protein.
Thus, The over all the spatial arrangement of atoms in a protein is called secondary structure. This is false . it is called as conformation.
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give the systematic name for the compound ba no3 2
The systematic name for the compound Ba(NO3)2 is barium nitrate. Barium nitrate is an inorganic salt with the chemical formula Ba (NO3)2. It is a colorless, odorless, and crystalline solid that is highly soluble in water. The compound is formed by combining one atom of barium and two ions of nitrate.
The name “barium” comes from the Greek word “barys,” which means “heavy,” and is a reference to its high density. The term “nitrate” refers to the polyatomic ion NO3-, which is composed of one nitrogen atom and three oxygen atoms. Barium nitrate is commonly used in pyrotechnics, as it is a powerful oxidizing agent that produces a bright green flame when ignited.
The systematic naming of inorganic compounds is based on the rules set out by the International Union of Pure and Applied Chemistry (IUPAC). The name of an ionic compound is composed of the cation name followed by the anion name. In the case of barium nitrate, “barium” is the name of the cation, while “nitrate” is the name of the anion.
Therefore, the systematic name for the compound Ba(NO3)2 is barium nitrate.
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if atmospheric pressure suddenly changes from 1.00 atm to 0.894 atm at 298 k, how much oxygen will be released from 2.80 l of water in an unsealed container
Approximately 0.490 g of oxygen will be released from 2.80 L of water in an unsealed container when the atmospheric pressure changes from 1.00 atm to 0.894 atm at 298 K.
Initial atmospheric pressure, P1 = 1.00 atm, Final atmospheric pressure, P2 = 0.894 atm, Initial volume of water, V1 = 2.80 L, The amount of oxygen released from water can be calculated using the formula: PV = nRT where, P = pressure of the gas, V = volume of the gas, n = number of moles of the gas, R = universal gas constant, T = temperature of the gas. From the given data, the initial pressure of water is equal to atmospheric pressure. Therefore, the pressure of oxygen in water is also 1 atm.
Calculating the number of moles of oxygen in the initial state.P1V1 = nRT1 n = P1V1 / RT1 = (1.00 atm)(2.80 L) / [(0.0821 L·atm/mol·K)(298 K)]n = 0.100 mol. In the final state, the pressure of oxygen is equal to the partial pressure of oxygen in air, which is equal to the product of the mole fraction of oxygen and the total pressure of air.P2V2 = nRT2where V2 is the final volume of water and n is the number of moles of oxygen at the final state. We can rearrange the equation to isolate n.n = P2V2 / RT2
We need to find the final number of moles of oxygen, so we need to calculate V2. Since the container is unsealed, we can assume that the total volume of the gas mixture (water vapor and air) is constant before and after the change in atmospheric pressure. Therefore,V1 + V(air) = V2 + VairV1 = V2We can use this relationship to calculate V2.V2 = V1 = 2.80 L. Now we can calculate the number of moles of oxygen in the final state. n = P2V2 / RT2 n = (0.894 atm)(2.80 L) / [(0.0821 L·atm/mol·K)(298 K)]n = 0.0847 mol
The change in the number of moles of oxygen isΔn = n, final - ninitialΔn = 0.0847 mol - 0.100 molΔn = -0.0153 mol. The negative sign indicates that the number of moles of oxygen has decreased. This is because the decrease in atmospheric pressure has caused some of the dissolved oxygen to come out of solution. The mass of oxygen that is released can be calculated using the number of moles of oxygen and the molar mass of oxygen. m = nMm = (0.0153 mol)(32.0 g/mol)m = 0.490 g
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Which would most likely be done while designing a solution?
researching the current uses of a fuel type
sketching a diagram of a new medical device
reporting the results of using a prototype
redesigning a model airplane that did not fly well
Answer:
sketching a diagram of a new medical device (b)
Explanation:
its on edge technical design not d i got that one wrong
Answer:
the answer is b
Explanation: i took the test edge 2021
Who wants to help me ???
Answer:
what do u need help tho
Explanation:
How are the properties of metals and non-metals different?
Answer:
Explanation:
Properties of metals:
1. They have a lustre ( shine )
2. They have a silvery-grey or golden-yellow colour.
3. They conduct heat and electricity.
4. They are ductile ( can be drawn into wires ) .
5.They are malleable ( can be hammered into thin sheets ).
6. They are sonorous ( make a ringing sound when hit ).
Properties of non-metals:
1. They display a variety of colours.
2. They are poor conductors of heat and electricity.
3. They are not lustrous, ductile or malleable.
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Which of these share chemical bonds
Mixtures
all matter
Compounds
Answer:
Compounds
Explanation:
All compounds of a substance shares chemical bonds between them and their structures.
The bonds can come in different forms. Compound are held by chemical bonds within their atoms.
Mixtures are composed of different atoms and compoundsThey are mostly not chemically bonded togetherMixtures can be separated by physical means because they lack bonds between them. Compounds are chemically bonded togetherThe color of the explosive mixture is yellow, green, and red-orange. Explain how the colors are formed and which three metals were most likely present in the rocket??
Answer:
m
Explanation:
Carbon cycle – What are the main reservoirs
of the carbon cycle? Where do the inorganic and organic carbon
cycles interact? What are the major differences and similarities
between the inorganic and organic carbon?
The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.
The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.
Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.
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True or false: protons and neutrons are the two particles found in an atoms nucleus ? 
Answer: True
Explanation:
I remember learning this in AP Chemistry class. Protons and neutrons are in the nucleus of an atom when electrons are outside the core.
Determine the empirical formula for each of the following 0.0130 mol carbon, 0.0390 hydrogen.
Here in the question determine the number of moles of each element relative to the other elements. Divide all the quantities by the smallest moles
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how do you solve this ?
1mol of Ba contains
\(\\ \sf\longmapsto 6.023\times 10^{23}atoms\)
No of moles in 17atoms
\(\\ \sf\longmapsto \dfrac{No\:of\:atoms}{Avagadro\:no}\)
\(\\ \sf\longmapsto \dfrac{17}{6.023\times 10^{23}}\)
\(\\ \sf\longmapsto 2.82298\times 10^{-23}mol\)
Option 2
13.0 g of ammonium chloride in 500 g of water. What is the new BP? (NH,CI=53.491g/mol)
Answer:
hwjwjwkwjwnwnnwnw wiwjwjejejejeje
Zinc metal can be obtained from Zinc Oxide by reaction at high temperature with CO. The CO is obtained from burning C in limited oxygen.
a) Write the balanced equation for the above reactions
b)What is the amount of Zn that can be obtained from 75g of zinc oxide and 50g of Carbon
Answer:
(a): 2ZnO(s) -----------> 2Zn(s) + O2(g)
2C(s) + O2(g) ---------> 2CO(g)
(b): ZnO(s) + C(s) ---------> Zn(s) + CO(g)
which of the following forces stabilize protein 3-dimensional structure? choice 1 of 6:ionic interactions choice 2 of 6:h-bonding choice 3 of 6:van der waals forces choice 4 of 6:metal ions choice 5 of 6:disulfide bonds choice 6 of 6:all of the above
All of the above forces (ionic interactions, H-bonding, van der Waals forces, metal ions, and disulfide bonds) play a role in stabilizing the 3-dimensional structure of proteins. Thus, the correct answer is Choice 6 of 6: all of the above.
Ionic interactions occur between positively and negatively charged amino acid residues, which helps to maintain the overall charge balance of the protein. H-bonding involves the sharing of electrons between atoms, and helps to hold the protein's secondary and tertiary structures in place. Van der Waals forces are relatively weak interactions between atoms, but they can contribute to the stability of the protein by helping to hold the atoms in place. Metal ions can also play a role in stabilizing the protein by binding to specific amino acid residues. Disulfide bonds form between cysteine residues and help to hold the protein's tertiary structure in place.
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which is the correct name for the compound n2o4? a. nitrogen oxide b. tetranitrogen dioxide c. dinitrogen quadoxide d. dinitrogen tetroxide
The correct name for the compound N₂O₄ is dinitrogen tetroxide. The formula N₂O₄ represents the molecule dinitrogen tetroxide.
Hence, option D (dinitrogen tetroxide) is the correct answer.
The formula for nitrogen monoxide is NO, nitrogen dioxide is NO₂, and nitrogen trioxide is N₂O₃. The term "tetranitrogen dioxide" (Option B) is incorrect as it contains the prefix "tetra-," which refers to four. There are only two nitrogen atoms present in the molecule.
The term "dinitrogen quadoxide" (Option C) is also incorrect because it does not exist. The term quadoxide does not apply to any known compound.
Hence, the correct name of the compound N₂O₄ is dinitrogen tetroxide (Option D).
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container a holds 712 ml 712 ml of ideal gas at 2.10 bar2.10 bar . container b holds 134 ml 134 ml of ideal gas at 4.80 bar4.80 bar . if the gases are allowed to mix together, what is the partial pressure of each gas in the total volume?
The saturation pressure of every gas in the entire volume, if somehow the gases being allowed to mix, is 2.5 atm.
Describe gases.In comparison to other forms of matter, like solids and liquids, vapors have a lower density. Particles have a great deal of kinetic energy yet aren't very attracted to one another, thus there is a lot of unoccupied space between them. A sampling of matter that assumes the shape of the bottle it is stored in and develops a consistent density on the inside of the container is referred to as a gas.
Pressure = 2.10 atm
Temperature = T K
Volume = 712 mL
= 0.712 L (1 mL = 0.001 L)
PV=nRT,
2.10 atm × 0.712 L = n × 0.0821 L.atm/K.mol × T K
n = 19.2232 / T moles
For Container B :
Pressure = 4.80 atm
Temperature = T
Volume = 134 mL
= 0.134 L (1 mL = 0.001 L)
= 4.80 atm × 0.134 L = n × 0.0821 L.atm/K.mol × 298 K
= n = 6.3435 / T moles
Total moles = 19.2132 / T moles + 6.3435 / T moles
= 25.5567 /T moles
Total Volume = 712 + 134 mL = 846 mL = 0.846 L
P × 0.846 L = 25.5567 /T × 0.0821 L.atm/K.mol × T
Total P = 2.5 atm
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To make a saturated solution 36g of sodium chloride is dissolved in 100g of water to form a saturated solution at 293K find its concentration at this temperature
At the temperature of 293K, the concentration of the saturated solution is 26.47 percent
We are given that the mass of sodium chloride = 36g
The mass of water is given to be 100g
Since Sodium chloride is being dissolved in water, it is solute
Water is the solvent since the solute is always dissolved in the solvent
The concentration of the solution is to be calculated by us
Mass of the solution = Mass of solvent + Mass of solute
⇒ Mass of solution = 36 + 100 = 136 g
The concentration of solution = \(\frac{mass of solute * 100}{mass of solvent}\)
⇒ (36 × 100)/ 136
⇒ 26.47 percent
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How many significant figures are in 320001
what information does gibbs free energy give about a reaction?
Answer:
In a practical and frequently used form of Gibbs free energy change equation, ΔG is calculated from a set values that can be measured by scientists: the enthalpy and entropy changes of a reaction, together with the temperature at which the reaction takes place.
Explanation:
c) the major organic product when 3-methylbut-1-ene reacts in dilute sulfuric acid (h2so4).
The major organic product when 3-methylbut-1-ene reacts in dilute sulfuric acid (\(H_2SO_4\)) is 2-methylbutan-2-ol. This reaction is an example of an electrophilic addition reaction.
1. The first step in this reaction is the protonation of the double bond in 3-methylbut-1-ene by the sulfuric acid. This creates a carbocation intermediate.
2. The carbocation intermediate is then attacked by a water molecule, which donates a proton to form the alcohol group.
3. The final step is the deprotonation of the alcohol group by another water molecule to form the final organic product, 2-methylbutan-2-ol.
The overall reaction can be represented by the following equation:
3-methylbut-1-ene + \(H_2SO_4\) → 2-methylbutan-2-ol
In conclusion, the major organic product of this reaction is 2-methylbutan-2-ol, which is formed through an electrophilic addition reaction involving the protonation of the double bond, followed by the attack of a water molecule and deprotonation.
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How does chemistry help athletes compete?
Answer: Competitive athletes at all levels – and even those who are in it for personal health – are driven by the Olympic motto Citius, Altius, Fortius – faster, higher stronger. The big question is how do they get there?
Explanation: The class is looking at these issues through a variety of eras in sports history from the first modern Olympic Games in 1896 to the Winter Olympic Games taking place this month in Pyeongchang, South Korea. “There are times when (illegal performance enhancement) has crept into the Olympics,” Roerdink said, citing the current ban handed down in December to Russian athletes accused of doping. Athletes with no previous drug violations were allowed to compete under the neutral “Olympic Athlete from Russia” flag. The class also will study Major League Baseball’s steroid era and examine the East German sports machine of the 1970s, among other timely topics. “I really wanted to share my passion for unique sporting events where we see the spotlight on the people who represent us, their passion, even the political bent to it, and figure out how chemistry comes into it,” Roerdink said. “The ultimate goal of the course is a better appreciation of doing sports for the sport of it.”
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Pcl3 is? a molecule, an element, and a mixture. 2. an atom, a compound, and a pure substance. 3. an atom, an element, and a mixture. 4. an atom, a compound, and a mixture.
The correct statement is: PCl3 is an example of a molecule, a compound, and a pure substance. PCl3 is an example of a molecule, a compound, and a pure substance.
Explanation:
1. PCl3 is a molecule: It consists of a combination of atoms (one phosphorus atom and three chlorine atoms) held together by covalent bonds. Molecules are formed when atoms chemically bond together.
2. PCl3 is a compound: A compound is a substance made up of two or more different elements chemically bonded together. PCl3 fits this definition as it is composed of phosphorus (P) and chlorine (Cl) atoms bonded together.
3. PCl3 is a pure substance: A pure substance refers to a substance that has a definite composition and distinct properties. PCl3 meets this criterion as it is a specific compound with consistent composition and properties.
Therefore, the correct statement is: PCl3 is an example of a molecule, a compound, and a pure substance.
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refers to the distance from one wave peak to the next wave peak. (Lesson
4.02)
A. frequency
B. wavelength
C. amplitude
D. medium
Answer:
wavelenght
Explanation:
Wavelength can be defined as the distance between two successive crests or troughs of a wave. ... Wavelength is inversely proportional to frequency. This means the longer the wavelength, lower the frequency. In the same manner, shorter the wavelength, higher will be the frequency.
Answer:
The answer is B) Wavelength
Explanation:
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the reaction converting glucose-6-phosphate to fructose-6-phosphate is catalyzed by a/an _____.
The reaction converting glucose-6-phosphate to fructose-6-phosphate is catalyzed by an enzyme called phosphohexose isomerase.What is an enzyme?An enzyme is a protein molecule that helps to speed up chemical reactions that take place in all living organisms by lowering the activation energy needed to start these reactions.
Each type of enzyme performs one specific reaction for converting one or more substrates (reactants) into one or more products.The reaction converting glucose-6-phosphate to fructose-6-phosphate is part of the glycolytic pathway that occurs in the cytoplasm of cells. During the process of glycolysis, a molecule of glucose is broken down into two pyruvate molecules, and a net of two ATP molecules is produced. The reaction converting glucose-6-phosphate to fructose-6-phosphate is important because it enables the rearrangement of the functional group of glucose-6-phosphate, from an aldehyde to a ketone, allowing for the subsequent reactions of glycolysis to proceed.In conclusion, the reaction converting glucose-6-phosphate to fructose-6-phosphate is catalyzed by an enzyme called phosphohexose isomerase. The reaction is an important part of glycolysis, which is the metabolic pathway that breaks down glucose to produce ATP.
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