Answer:
Explanation:
The energy of a particle in the box increases proportionally to n-squared. This means that the energy spacings increase at high values of n.
The energy levels of a quantum particle-in-a-box decreases as the quantum number increases.
What are Quantum Numbers?Quantum numbers can be used to describe the trajectory and the movement of an electron in an atom.
The set of numbers used to describe the position and energy of an electron in an atom is called quantum numbers.
These are the four quantum numbers, i.e., principal quantum number (n), magnetic quantum number (m), azimuthal quantum number (l), and spin quantum number (s).
As the energy levels of a quantum particle-in-a-box decreases as the quantum number increases.
Therefore, The energy levels of a quantum particle-in-a-box decreases as the quantum number increases.
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Why do the planets in our solar system orbit in approximately the same plane around the sun?
In the malate–aspartate shuttle, electrons are transferred from _____________ to form malate.
In the malate–aspartate shuttle, electrons are transferred from oxaloacetate to form malate.
A crucial mechanism employed by mitochondria, the malate-aspartate shuttle system, also known as the malate shuttle, enables electrons to pass through the impermeable membrane separating the cytosol as well as the mitochondrial matrix. Glycolysis produces the electrons which are required for oxidative phosphorylation.
The liver, heart, as well as kidney, include the malate-aspartate shuttle, which produces about three molecules of ATP for every cytosolic NADH molecule. Under aerobic conditions, it constitutes quantitatively the most significant shuttle for such reoxidation of cytosolic NADH in vertebrate tissues.
Therefore, In the malate–aspartate shuttle, electrons are transferred from oxaloacetate to form malate.
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What is the molar mass of a protein if a 0. 30 l of solution containing 0. 45 g of the protein has an osmotic pressure of 0. 80 torr at 25∘c?
The molar mass of a protein if a 0. 30 l of solution containing 0. 45 g of the protein has an osmotic pressure of 0. 80 torr at 25∘c is 0.348 g/mol
Here we can apply the formula ∏ = iMRT, where ∏ = osmotic pressure = 0.80 - ( given ). This is only one part of the information we are given / can conclude in this case ....
i = van’t Hoff factor = 1 for a protein molecule,
R = gas constant = 62.36 L torr / K-mol,
T ( temperature in Kelvin ) = 25 + 273 - conversion factor C° + 273 = 298K
( Known initially ) ∏ = osmotic pressure = 0.80 torr
besides the part " M " in the formula, which we have no information on whatsoever, as we have to determine it's value.
_____
Substitute derived / known values to solve for M ( moles / liter ) -
∏ = iMRT
⇒ 0.80 = ( 1 )( M )( 62.36 )( 298 )
⇒ 0.80 = M( 18583.28 )
⇒ M = 0.80 / 18583.28 ≈ 4.3049 ....
_____
We know that M = moles / liter, so we can use this to solve for moles, and hence calculate the molar mass by the formula molar mass = g / mol -
M = mol / l
⇒ 4.3049 = 0.045 / 25 mL ( 0.030 L ),
0.045 / 0.030 = 1.5 g / L
⇒ 1.5 g = 4.3049 moles,
molar mass = 1.5 g = 4.3049 moles = 0.348 g / mol
Thus the concluded that the molar mass of protein is 0.348 g / mol.
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The oxygen used for preheating and the fuel gas are combined in the ____ chamber before burning.
Answer:
Mixing chamber
What eventually happens to a gas if its pressure is increased?
Answer:
According to Boyle's law pressure of a particular amount of gas is inversely proportional to the volume of the gas.So, when we increase the pressure of the gas the volume of the gas decrease and the gas start to condense.Thus if the pressure of a gas increases it starts to condense.Explanation:
Hope It Helps!!!!
Answer:
See belwo
Explanation:
First it becomes a compressed gas.... further pressure will cause it to condense into a liquid.
Sodium hydrogen carbonate were disolved in 10cm cubed of water in a boiling tube . Lemon juice was then added dropwise with shaking until there was no further observable change. Explain the observation which was made in the boiling tube when the reaction was in progress.
The observation is the evolution of carbon dioxide gas.
Acid-base reactionSodium hydrogen carbonate is a base while lemon juice contains an acid known as citric acid.
Thus, the reaction in the illustration is involving an acid and a base.
Sodium hydrogen carbonate goes by the formula: NaHCO₃
Citric acid goes by the formula: C₆H₈O₇
The reaction between the two goes thus:
[tex]3 NaHCO_3 + C_6H_8O_7 --- > 3 H_2O + 3 CO_2 + Na_3C_6H_5O_7[/tex]
The carbon dioxide gas is evolved from the reaction vessel in the form of bubbles.
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How much 0. 5mna2so4 solution will completely precipitate the ba2 in 0. 7l of 0. 13mbacl2 solution?
The volume required to precipitate 0.7l of 0.13 m BaCl2 is 0.04L.
Calculations of number of moles for given molarity of solutionwe use
Molarity =Moles of solute / volume of solution (in litre)
Now, for barium ions
Given,
Molarity of solution = 0.13 m
Volume of solution = 0.7L
By substituting all the value ,we have
Moles of Barium = 0.7 × 0.13
= 0.091
Chemical equationBaSO4 » Ba2+ + So2-
By stoichiometry of equation
1 mole of sulphate ion precipitate 1 mole of barium ion
So, 0.091 mole of sulphate ion precipitate
0.091 of moles of Barium ion
Calculation of volume of sulfate ionNow, calculate the volume of ions by using equation as given above
Mole of sulphate ion = 0.091 mol
Molarity concentration of sulphate ions = 0.05m
By substituting all value , we get
C = n / V
V = n/ C
= 0.091 / 0.5 = 0.04L
Thus, we calculated that the volume required to precipitate 0.7l of 0.13 m BaCl2 is 0.04L.
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Which of the following is true: A. Gamma rays are too dangerous to be used in a medicinal way. B. Gamma radiation is used commonly used in smoke detectors C. Gamma radiation should never be used on food products. D. Gamma radiation is frequently used on food to kill bacteria.
Answer:
D
Explanation:
Gamma radiation penetrates the cell wall of prokaryotic organisms such as bacteria and can inhibit their metabolic functions as well as destroy their DNA.
Debunking the other answers:
A is incorrect as Gamma radiation is used in the treatment of cancer via radiotherapy.
B is incorrect as Gamma rays are too small and would just penetrate any smoke particles.
C is incorrect because Gamma rays are used to disinfect food products to prevent food borne illness. Irradiation is safe to use on food and does not make it radioactive.
Thus, D is correct.
There are 4 gleeks in a glook, 7 glooks in a gluck, and 5 glucks in a glack. how many gleeks are in 4 glacks?
Answer:
9
Explanation:
because there are 4 gleeks and 5 Gluck's in a glack
Hello people ~
Volume of one mole of any gas at NTP is
(a) 11.2 litre
(b) 22.4 litre
(c) 10.2 litre
(d) 22.8 litre
Answer:
Volume of one mole of any gas at NTP is
(b) 22.4 litre
Answer:
22.4L
Explanation:
One mole of any gas at STP weighs 22.4L.
STP stands for Standard Temperature and pressure
273.15KPressure 1atmDetermine the number of moles of aluminum in 2. 154 x 10-1 kg of al.
a. 5.816 mol
b. 7.984 mol
c. 6.02 x 1023 mol
d. 4.801 mol
e. 8.783 mol
The moles are the estimation of the quantities like the molecules and the atoms. There are 7.984 moles of aluminum present in the 2.154 × 10⁻¹ kg substance. Thus, option b is correct.
What are moles?The moles give the estimation of the smaller entities by the ratio of mass or weight to the molar mass of the substance.
The formula for moles is given as,
Moles = mass ÷ molar mass
Given,
Mass of aluminium = 2.154 × 10⁻¹ kg = 2.154 × 10² gm
Molar mass of Al = 26.9 g/mol
Substituting values above:
Moles = 2.154 × 10² gm ÷ 26.9 g/ mol
= 7.984 mol
Therefore, option. 7.984 moles of aluminum are present.
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If you halve the volume of a constant amount of gas at a constant temperature, what happens to the pressure?
According to Boyle's law, If one halves the volume of a constant amount of gas at a constant temperature, the pressure will be doubled.
What is Boyle's law?Boyle's law is one of the gas laws that states that the pressure of an ideal gas is inversely proportional to its volume at constant temperature.
Boyle's law equation can be represented as follows:
P = KV
This law suggests that as the pressure of a gas increases, the volume decreases.
Therefore, in accordance with Boyle's law, If one halves the volume of a constant amount of gas at a constant temperature, the pressure will increase times 2 or double.
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When a substance is entering a phase change, the gain or loss of heat is a result of:______.
When a substance is entering a phase change, the gain or loss of heat is a result of energy gained or lost in forming or breaking intermolecular interaction.
The constant temperatures occur when a substance is undergoing a phase transition. If heat is removed from a substance , such as in freezing and condensation , then the process is exothermic . In this instance , heat is decreasing the speed of the molecules causing then move slower.
Example : liquid to solid and gas to liquid .
These changes release heat to the surrounding.
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In the laboratory, a student dilutes 18. 9 ml of a 10. 0 m perchloric acid solution to a total volume of 250. 0 ml. what is the concentration of the diluted solution? concentration = m submit answer
The concentration of diluted solution is 0.756M.
From the question given above, the following data were obtained:
Volume of stock solution (V1) = 18.9 mL
Molarity of stock solution (M1) = 10 M
Volume of diluted solution (V2) = 250 mL
Molarity of diluted solution (M2) =?
We can obtain the molarity of the diluted solution by using the dilution formula as shown follow:
M1V1 = M2V2
10 × 18.9 = M2 ×250
189 = M2 × 250
Divide both side by 100
M2 = 189 / 250
M2 = 0.756 M
Therefore, the molarity of the diluted solution is 0.756 M.
Thus the concluded that concentration of the dilute acid is 0.756 M.
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If a parcel of air has a temperature of -1. 1c, what is saturation mixing ratio for this parcel?
The saturation mixing ratio for this parcel is 3.5
Saturation mixing ratio:
The value of the mixing ratio of saturated air at the specified temperature and pressure; a thermodynamic function of the state.
A thermodynamic diagram can be used to directly read this value. The saturation mixing ratio speaks of saturation in relation to a plane surface of pure water without any other qualifier. Additionally, saturation mixing ratios can be defined in relation to a flat ice surface.
The mass of water vapor to the mass of dry air (Md) in a parcel of air at saturation is known as the saturation mixing ratio. In other words, the saturation mixing ratio is the most water vapor a package can contain without condensing. The saturation mixing ratio on the Skew-T is represented by the mixing ratio line that passes through the temperature.
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How many neutrons are needed to initiate the fission reaction? u92235 ?10n⟶te52137 zr4097 210n
Neutrons are required. Atomic Radiation, Nuclear Graphite, and Effects
The fission reaction is often started by an impinging neutron, and each fission produces an average of 2.5 neutrons.
With the exception of the hydrogen nucleus, which has a single proton, neutrons are necessary for the stability of nuclei. Nuclear fission and fusion generate a tonne of neutrons.
Scattering tests and research on nuclear binding energies provide evidence for the nuclear forces' finite range. The neutron-proton (n-p) potential energy map in Figure 44.3a, which was created by scattering neutrons from a target containing hydrogen, illustrates the short range of the nuclear force. The n-p potential energy well is 40 to 50 MeV deep, and the nucleons are prevented from getting much closer than 0.4 fm by a strong repulsive component.
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We need to add one neutron to initiate the fission reaction.
What are nuclear reactions?The reaction in which the identity or characteristics of an atomic nucleus change due to the bombarding of it with an energetic particle is known as a nuclear reaction.
The bombarding particle can be an alpha particle, a gamma-ray photon, a neutron, a proton, or a heavy ion.
What is nuclear fission?In nuclear fission, an atom splits into lighter nuclei due to the bombarding of an energetic particle.
The reaction given is
[tex]_{92}^{235}U + .... _{0}^{1}n \rightarrow _{52}^{137}Te + _{40}^{97}Zr +_{0}^{1}n[/tex]
To find the number of neutrons we have to balance the reaction
Atomic mass on reactant side = 235 + 1 = 236
The atomic number on the reactant side = 92
Atomic mass on the products side = 137+97+2 = 236
The atomic number on the products side = 92
As the reaction is already balanced
We need to add one neutron to initiate the fission reaction.
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During an experiment a thermometer was placed in a beaker containing hydrogen peroxide. The following observations were recorded when yeast granules were added to hydrogen peroxide.
Observation 1: Fizzing and bubbling took place.
Observation 2: The temperature began to rise.
Based on the observation, justify the type of change (physical or chemical) that took place
The states of matter change to produce the same or the new substance. When yeast is added to hydrogen peroxide bubble of carbon dioxide is formed which indicates chemical change.
What is a chemical change?A chemical change is the formation of a new substance by the chemical alterations in the reactants. The yeast releases products of cellular respiration that react with hydrogen peroxide.
The reaction is exothermic as it releases heat and increases the temperature when measured by the thermometer. The Fizzing and bubbling occur when carbon dioxide reacts with H₂O₂ to produce a new substance.
Therefore, addition of yeast to hydrogen peroxide is a chemical change.
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Answer:
The type of change that took place is most likely a chemical change, due to the recordable reactivity of the hydrogen peroxide to the yeast granules in the experiment.
Explanation:
As stated in the question, the hydrogen peroxide started fizzing and bubbling in reaction to the yeast granules, which is already a sign of a chemical change. The question also states that there was an increase in temperature. This is another sign of a chemical change. Hope this helped (;
Sample Response: The change in her position (from beginning to end), along with the direction, is considered her displacement. This value is a measurement and a direction. The total distance along the path from her starting point to her end point is considered her distance. This value is a measurement only. What did you include in your response? Check all that apply.
The sample response given in the question is right. Displacement is the shortest distance between the initial and final points of a body. Distance is the length of actual path of the body between initial and final positions.
To find the answer, we need to know more about the distance and displacement.
How distance differ from displacement?Displacement is the shortest distance between the initial and final points of a body.It is the change in position with a fixed direction.Displacement is a vector quantity and can be positive, negative or zero values.Distance is the length of actual path of the body between initial and final positions.It's a scalar quantity and it can be positive or zero.The magnitude of displacement is less than or equal to the distance travelled.Thus, we can conclude that the given sample response is right.
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Heliox is a mixture of helium and oxygen gas used to help patients with breathing difficulties. It is also used for scuba diving. The total pressure in a tank of heliox is 208 atm. If the mole fraction of o2 is 0. 220, what is the partial pressure of he in the tank?.
It should be remembered that the mole fraction of any component making up a system is 1.
A mole fraction is what?the proportion of the moles of one component to the total moles of all the components in a solution or other mixture.
What is mole fraction and an example of it?The ratio of molecules of one component in a mixture is known as a mole fraction. For instance, if the methane mole fraction in a gas is 0.90, then this implies that 90% of the molecules are methane. The mixture also contains 90% methane since the amount fractions resemble mole fractions.
How is the mole fraction determined?By dividing the moles of the solute by the total moles of the substances in the solution, you may determine the mole fraction of the solute.
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does anyone know the answer to this? is it A?
Answer:
1/2 ( the two answers given are not FRACTIONS)
Explanation:
Moles of CH3OH = 128 gm / 32 gm / mole = 4 moles
Moles of water 72 gm / 18 gm /mole = 4
Mole fraction of CH3OH = 4 / ( 4+4) = 4/8 = 1/2
H2o is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place?
H2o is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. Gaseous state to liquid state has most likely take place.
In the gaseous state, molecules of water are far away. Hence intermolecular forces are weak.
But when water vapours changes into liquid state molecules start coming closer. And hence intermolecular forces become strong.
Due to this entropy of water molecules decreases.
Thus from above we concluded that when water vapour changes into liquid its molecules is slow down.
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24. 00 ml of a 0. 25 m naoh solution is titrated with 0. 10m hcl. What is the ph of the solution after 24. 00 ml of the hcl has been added?.
The pH of the solution is 12.88.
Calculation:
millimoles of NaOH = volume x Molarity
= 24.00 mL x 0.25 M
= 6.00 mmole
millimoles of HCl = 24.00 mL x 0.10 M
= 2.40 mmole
Total volume = 48.00 mL
NaOH + HCl → NaCl + H2O
initial 6.00 0 0 0
added 2.40
change -2.40 -2.40 +2.40 +2.40
equilibrium 3.60 0 2.40 2.40
The pH is determined by the excess of NaOH present.
[NaOH] = millimoles/volume
= 3.60/48.00
= 0.075 M
pOH = -log (OH⁻).
= -log (0.075)
= 1.12
Then
pH + pOH = pKw = 14.00.
pH = 14 - pOH
pH = 14 - 1.12
pH = 12.88
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3h2so4 2b(oh)3 - b2(so4)3 6h2o what is the mole ratio between water and sulfuric acid?
Since there is an equal number of each element in the reactants and products of 3H2SO4 + 2B(OH)3 = B2(SO4)3 + 6H2O, the equation is balanced.
What is Sulfuric acid?Sulfuric acid (H2S04) is a corrosive substance, that destroys the skin, eyes, teeth, and lungs. Severe vulnerability can result in death. Workers may be harmed from disclosure to sulfuric acid. The level of exposure depends on The sulfuric acid bleaching can substitute the presently assumed oxygen and chlorine stages if the additives are allowed. This bleaching process was also practical for oxygen-bleached hardwood kraft pulp, but it was less compelling for softwood kraft pulp and oxygen-bleached softwood kraft pulp.Disbanding sulfuric acid in water is an exothermic procedure. When sulfuric acid is mixed with ice this exothermic procedure causes the temperature to rise at first, but as more of the ice dissolves, the temperature falls.To learn more about Sulfuric acid, refer to:
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Given substances f2, kr, cl2 and hbr rank them with respect to the highest boiling point?
The Hbr has highest boiling point followed by Kr , [tex]Cl_{2}[/tex] and [tex]F_{2}[/tex] .
The Hbr has highest boiling point due to presence of intermolecular H-bonding that is hydrogen bonding.
The electronegativity of bromine is greater than hydrogen atom. The electronegativity difference hydrogen atom and bromine atom is high. So, due to this a positive dipole is generated at hydrogen atom and partial negative charge, these partial charge is called dipole. In a HBr molecule one H-atom attracted by Br-atom of another atom by force of attraction and this partial force of attraction is called H-bonding.
Other all given molecules are arrange according to its molecular mass because boiling points is directly proportional to the molecular mass of molecule.
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13. Which compound reacts third fastest with fuming sulfuric acid? a. Toluene b. Chlorobenzene d. Nitrobenzene e. Benzene c. Aniline.
Toluene compound reacts third fastest with fuming sulfuric acid.
The reaction is attached in figure -
When nitration of toluene is carried out in presence of fuming nitric acid and fuming sulfuric acid under 333 K temperature , 2, 4, 6-trinitro toluene is the final product .This 2, 4, 6-trinitro toluene is also called TNT. TNT is used as explosive.What is toluene?
Toluene is a common ingredient in degreasers. It's a colorless liquid with a sweet smell and taste. It evaporates quickly. Toluene is found naturally in crude oil, and is used in oil refining and the manufacturing of paints, lacquers, explosives (TNT) and glues.What is a toluene used for?
Toluene is found naturally in crude oil, and is used in oil refining and the manufacturing of paints, lacquers, explosives (TNT) and glues. In homes, toluene may be found in paint thinners, paintbrush cleaners, nail polish, glues, inks and stain removers.Learn more about Toluene
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How much naoh (in mg) is needed to prepare 546 ml of solution with a ph of 10. 00?
2.18 mg of naoh is needed to prepare 546 ml of solution with a ph of 10.00.
What is Molarity?
The amount of a substance in a specific volume of solution is known as its molarity (M). The number of moles of a solute per liter of a solution is known as molarity. The molar concentration of a solution is another name for molarity.
We want pOH 4 NaOH solution
Given, pH (10) convert to pOH
pOH = 4; pOH = -log (OH⁻) = 1 x 10⁻⁴ M = NaOH
Once we have got the Molarity = Moles of NaOH/Litre of soln.
Stoich = 1 x 10⁻⁴ M/L X 0.546 L X 40 g NAOh/1 mol
Naoh = 2.18 X 10⁻³ g NaOH = 2.18 mg
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Changes in the composition of the atmosphere have caused gradual changes in earth's _______ throughout history, causing changes in plant and animal life that contributed to mass extinctions.
climate
Changes in the composition of the atmosphere have caused gradual changes in earth's climate throughout history, causing changes in plant and animal life that contributed to mass extinctions.
The following are some of the reasons:
UV lightclimatepollutantshydrofluorocarbonsheat
The surface of the Earth warms up as sunlight strikes it. Surface-emitted infrared light is absorbed in the atmosphere and transformed into heat. The temperature close to the surface rises as a result of this heat being trapped in the atmosphere.UV light:indirect impacts of climate change on UV radiation from the surface. By changing the concentrations of ozone, UV-absorbing tropospheric gases, aerosols, and clouds in the atmosphere, climate change may have indirectly affected UV radiation levels in the past. These influences are probably going to persist in the future.climate:People are at risk from food and water shortages, greater flooding, high heat, an increase in disease, and economic loss due to climate change. Conflict and human migration are potential outcomes. Climate change is the top hazard to world health in the twenty-first century, according to the World Health Organization (WHO).pollutants:these are also resulting in the increase of temperature of the Earth and is also damaging ozone layer.To learn more about the changes in earth visit:
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How does the valency of an element show its reactiveness in a chemical reaction
Answer:
Within each group of metals, reactivity increases as you go down the group. The valence electrons are less tightly bound and easier to remove, because they are farther away from the nucleus of the atom. A nonmetal tends to attract additional valence electrons to attain a full valence shell.
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A mass spectrum for propane will have its largest peak at what number? (ie-mass of propane)
A mass spectrum for propane will have its largest peak at 44 number.
Mass spectrum
.An analytical method for determining the mass-to-charge ratio of ions is mass spectrometry (MS). The findings are displayed as a mass spectrum, which is a plot of intensity against the mass-to-charge ratio. Mass spectrometry is utilized in a wide range of disciplines and can analyze both pure materials and intricate mixtures. A visualization of the ion signal as a function of the mass-to-charge ratio is known as a mass spectrum. The masses of particles and molecules in a sample, as well as the chemical identity or structure of molecules and other chemical compounds, are all determined using these spectra.
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What substance is produced at the cathode during the electrolysis of molten calcium bromide, cabr2cabr2? assume standard conditions
Magnesium (Mg) metal is the substance produced at the cathode.
As molten calcium bromide is electrolyzed, calcium (Ca) metal is the substance produced at the cathode.
Due to the fact that oxidation always takes place at the anode and reduction always occurs at the cathode,
Consider the two cations that were produced in the two ionisation processes of the two substances: mathrm Ca +2 and mathrm Mg +2. The following is how to express two cations' potential cathode reactions:
[tex]ca { }^{ + 2} + (aq) + 2e {}^{ - } - > \\ ca(s)E {}^{0} _{ca {}^{ + 2} \div ca } = - 2.87v[/tex]
[tex] Mg{ }^{ + 2} + (aq) + 2e {}^{ - } - > \\Mg(s)E {}^{0} _{Mg {}^{ + 2} \div Mg} = - 2.37v[/tex]
[tex] Mg^{ + 2} [/tex]
will be reduced quickly since it has a low electronegative electrode potential.
Thus, magnesium (Mg) metal is the substance produced at the cathode.
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