If the solvent level in the developing jar is deeper than the origin (spotting line) of the TLC plate, the solvent will dissolve the compounds into the solvent reservoir instead of allowing them to move up the plate by capillary action. Thus, you will not see spots after the plate is developed.
What is Thin Layer Chromatography (TLC)?
TLC is a simple, quick, and inexpensive procedure that gives the chemist a quick answer as to how many components are in a mixture. TLC is also used to support the identity of a compound in a mixture when the Rf of a compound is compared with the Rf of a known compound.A TLC plate is a sheet of glass, metal, or plastic which is coated with a thin layer of a solid adsorbent (usually silica or alumina). A small amount of the mixture to be analysed is spotted near the bottom of this plate. The TLC plate is then placed in a shallow pool of a solvent in a developing chamber so that only the very bottom of the plate is in the liquid. This liquid, or the eluent, is the mobile phase, and it slowly rises up the TLC plate by capillary action.As the solvent moves past the spot that was applied, an equilibrium is established for each component of the mixture between the molecules of that component which are adsorbed on the solid and the molecules which are in solution. In principle, the components will differ in solubility and in the strength of their adsorption to the adsorbent and some components will be carried farther up the plate than others. When the solvent has reached the top of the plate, the plate is removed from the developing chamber, dried, and the separated components of the mixture are visualized. If the compounds are coloured, visualization is straightforward. Usually the compounds are not coloured, so a UV lamp is used to visualize the plates. The plate itself contains a fluorescent dye which glows everywhere except where an organic compound is on the plate.To learn more about TLC: https://brainly.com/question/13483325
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what type of solution do you have if you dissolve 20.2 g of potassium chlorate in 0.300 L
solution of potassium chlorate,
K
C
I
O
3
, has 20 grams of the salt dissolved in 100 grams of water at 70 C. Approximately how many more grams of the salt can be added to the solution before reaching the saturation point?
Please help.. I'm Giving Brainliest :)
Answer:
i think its -91.6
Explanation:
2 ( - 950.8) - (( - 1130.7) + ( - 393.5) + ( - 285.8))
The standard enthalpy change for the given reaction is approximately 91.9 kJ mol⁻¹.
The heat produced during a chemical reaction under specific conditions is known as the standard enthalpy change, abbreviated as H° (zero delta H). Standard conditions often refer to all reactants and products in their standard states, which are their most stable forms at 298 K and 1 bar (or 1 atm) pressure.
Hess's law, which states that the total enthalpy change of a reaction is equal to the sum of the enthalpy changes of its component phases, is used to calculate the standard enthalpy change of the reaction.
The following reaction is given:
[tex]\rm 2 NaHCO_3(s)--- > Na_2CO_3(s)+ CO_2(g) + H_2O(l)[/tex]
The relevant enthalpy changes of formation are:
ΔH°[NaHCO3(s)] = -950.8 kJ mol⁻¹
ΔH°[Na2CO3(s)] = -1130.7 kJ mol⁻¹
ΔH°[CO2(g)] = -393.5 kJ mol⁻¹
ΔH°[H2O(l)] = -285.8 kJ mol⁻¹
By using Hess's Law, the standard enthalpy change (ΔH°) for the reaction can be calculated as follows:
ΔH° = Σ (products) - Σ (reactants)
ΔH° = [ΔH°[[tex]\rm Na_2CO_3[/tex](s)] + ΔH°[[tex]\rm CO_2[/tex](g)] + ΔH°[H2O(l)]] - [2 × ΔH°[[tex]\rm NaHCO_3[/tex](s)]]
ΔH° = [-1130.7 kJ mol⁻¹ + (-393.5 kJ mol⁻¹) + (-285.8 kJ mol⁻¹)] - [2 × (-950.8 kJ mol⁻¹)]
ΔH° = [-1809.7 kJ mol⁻¹] - [-1901.6 kJ mol⁻¹]
ΔH° ≈ -1809.7 kJ mol⁻¹ + 1901.6 kJ mol⁻¹
ΔH° ≈ 91.9 kJ mol⁻¹
Hence, the standard enthalpy change for the given reaction is approximately 91.9 kJ mol⁻¹.
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The _____ is the mass of tissue lying beside the fetus that allows nutrients and oxygen to pass from the mother's blood to the baby's blood
A sizable organ that grows during pregnancy is the placenta. It is typically at the top or side of the uterine wall where it is attached. The placenta and your baby are joined by the umbilical cord. Through the placenta's filtering of the mother's blood and the umbilical cord, your baby receives oxygen, glucose, and other nutrients.
A sizable organ that grows during pregnancy is the placenta. It is typically at the top or side of the uterine wall where it is attached. The placenta and your baby are joined by the umbilical cord.
Blood from the mother filters oxygen, glucose, and other nutrients before traveling via the placenta and reaching your baby through the umbilical cord.
Blood from the mother filters oxygen, glucose, and other nutrients before traveling via the placenta and reaching your baby through the umbilical cord. Additionally, the placenta filters out elements that can be dangerous to your unborn child and eliminates waste products and carbon dioxide from your unborn child's blood.
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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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How many particles are there in 5 grams of sodium carbonate?
3.01× 1024 particles are the number of particles are there in 5 grams of sodium carbonate.
How many particles are there in 5 grams of sodium carbonate?There are 6.022 × 1023 particles in one gram of a substance according to Avogadro's number. So when we find out for 5 grams, then we multiply 5 with 6.022 × 1023, we get 3.01 × 1024 particles. For one gram atomic weight of hydrogen, one mole of hydrogen contains 6.022 × 1023 hydrogen atoms.
So we can conclude that 3.01× 1024 particles are the number of particles are there in 5 grams of sodium carbonate.
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Discuss potential advantages and disadvantages of using water as a solvent in organic chemistry.
Potential advantages of using water as a solvent in organic chemistry are:
Natural resource, easy to obtain, lower cost.Avoiding biomass drying step.Facilitating recovery of inorganics contained in biomass.Disadvantages of using water as a solvent in organic chemistry
Higher critical point, severe reaction conditions.Lower yields of water insoluble bio-oil.The bio-oil with higher oxygen content and lower calorific value.What is the most widely used liquefaction solvent?Water is the most common liquefaction solvent. Not only is water an environmentally friendly solvent that is inexpensive and does not pollute the environment, but it also facilitates the recovery and recycling of inorganic matter contained in biomass in ionic form for eventual use as fertilizers.
Why is water called a universal solvent?Water dissolves many substances and is known as a universal solvent. We learned that, despite being a universal solvent, it can only dissolve polar molecules and that nonpolar molecules, even when mixed with water, form a separate layer.Many researchers around the world have studied the effect of liquefaction solvent type on the liquefaction behaviors of various biomasses, including lignocelluloses, algae, and sewage sludge.Learn more about water as a solvent:
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3) During a chemical reaction, atoms are ________. A) destroyed B) created C) rearranged D) destroyed and created
Answer: C- rearranged
Explanation:
Answer:
C
Explanation:
Risk premiums on corporate bonds tend to ________ during business cycle expansions and ________ during recessions, everything else held constant.
Risk premiums on corporate bonds tend to decreases during business cycle expansions and increases during recessions, everything else held constant.
A bond that is sold for more than it is worth. when the prevailing interest rate is lower than the coupon rate.
Corporate bond risk premiums have become typically anticyclical, meaning they rise during recessions as well as fall throughout expansions of the business cycle.
Bonds that trade above their face value or cost more than their face value are referred to as premium bonds. Since its interest rate has been higher than those of the current market, a bond may trade at a premium. The bond's price may also increase as a result of the company's as well as the bond's credit ratings.
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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
Rutherford’s gold foil experiment gave evidence that an atom is mostly empty space. true false
The given statement is true .
What is Rutherford’s gold foil experiment?A piece of gold foil was hit with alpha particles, which have a favorable charge. Most alpha particles went right around. This showed that the gold particles were mostly space.The Rutherford gold leaf investigation supposed that most (99%) of all the mass of an atom is in the middle of the atom, that the nucleus is very small (105 times small than the length of the atom) and that is positively captured.For the distribution experiment, Rutherford enjoyed a metal sheet that could be as thin as practicable. Gold is the most malleable of all known metals. It can easily be converted into very thin sheets. Hence, Rutherford established a gold foil for his alpha-ray scattering experimentation.To learn more about Rutherford’s gold foil experiment, refer to:
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The coefficient of performance (cop) of a refrigerator is defined as the ratio of?
The coefficient of performance (cop) of a refrigerator is defined as the ratio of " the work necessary to heat or cool something usefully."
The usable heating or cooling delivered to work required ratio, also known as the coefficient of performance, or COP, of a heat pump, refrigerator, as well as air conditioning system. Higher efficiency, less energy (power) usage, and thus reduced operational costs are all related to higher COPs.
Coefficient of performance formula:
[tex]K = Q_{H} / W_{in}[/tex]
where, K = Coefficient of performance, [tex]Q_{H}[/tex] = heat of pumps output, [tex]W_{in}[/tex] = work required by the system.
It is refrigeration's coefficient of performance (COP) will always be greater than 1.
Therefore, the coefficient of performance (cop) of a refrigerator is defined as the ratio of " the work necessary to heat or cool something usefully."
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What substance is produced at the cathode during the electrolysis of a mixture of molten calcium bromide, cabr2(l)cabr2(l), and molten magnesium iodide, mgi2(l)mgi2(l)? assume standard conditions
Mg (Magnesium) is produced at the cathode during the electrolysis of a mixture of molten calcium bromide, CaBr₂ (l) and molten magnesium iodide, MgI₂ (l).
What is Anode and cathode ?The anode in the cell has been the negative electrode and attracts the positive ions in the solution. The cathode has been the positive electrode, and attract negative ions.
What is Electrolysis of Calcium Bromide ?In electrolysis of Calcium bromide, Calcium will form at the cathode and Bromine will form at the anode.
The reaction is as follows:
2Br⁻ (aq) → Br₂ (g) + 2e⁻
What is Electrolysis of Magnesium Iodide ?In electrolysis of magnesium Iodide, Magnesium will form at the anode Iodine will form at the cathode.
The reaction is as follows:
2I⁻ (aq) → I₂ (g) + 2e⁻
Thus from the above conclusion we can say that Mg (Magnesium) is produced at the cathode during the electrolysis of a mixture of molten calcium bromide, CaBr₂ (l) and molten magnesium iodide, MgI₂ (l).
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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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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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How many grams of silver may be formed by the passage of 9,604 c through an electrolytic cell that contains a molten silver salt?
The grams of silver formed by the passage of 9,604 c through an electrolytic cell that contains a molten silver salt is 10.7g.
Acc. Faraday’s law of electrolysis,
W=(I×t×M) /nF
W=Faraday’s constant=96500
F=time M=molar mass
N=no. Of el.
It=9604C
Given,
Molar mass of silver=108g/mol.
n=1.
Then weight of silver deposited can be given as
W=(9604×108)/(96500×1)
= 10.7g
Thus we concluded that the silver deposited is 10.7g
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As a whole, plants tend to release more oxygen than carbon dioxide into the environment, but the ratios of gases differ at various times of the day. plants tend to take in more carbon dioxide during the day and release more oxygen. at night, they tend to take in more oxygen and excrete more carbon dioxide. how does the model support this phenomenon?
During the day, due to the existence of sunlight, the procedure of photosynthesis elevations over that of respiration. Photosynthesis uses carbon dioxide to produce carbohydrates removing oxygen as a byproduct. During the night, because there is no sunlight, the rate of photosynthesis decreases. This, therefore, drives the rate of respiration to surpass the speed of photosynthesis. In respiration, oxygen is consumed and carbon dioxide is dismissed.
What is photosynthesis?Photosynthesis is the process by which manufacturers use sunlight, water, and carbon dioxide to produce oxygen and energy in the form of sugar.The primary position of photosynthesis is to transform solar energy into chemical energy and then reserve that chemical energy for prospective use. For the most part, the planet's living designs are powered by this process.An illustration of photosynthesis is how plants convert sugar and significance from water, air, and sunlight into energy to grow. Description of photosynthesis is the procedure through which plants use water and carbon dioxide to assemble their food, grow and remove excess oxygen into the air.To learn more about photosynthesis, refer to:
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Given the following reaction: 2O3---->3O2. DeltaH of reaction=-286kJ/mol
What is the Delta H reaction of the reaction 3O2----->2O3
The enthalpy of reaction (ΔH) of the above chemical reaction is equal to -143 kJ/mol.
What is a chemical reaction?A chemical reaction can be defined as a chemical process that involves the continuous transformation (rearrangement) of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, in order to produce a new chemical compound while new bonds are formed.
What is a balanced equation?A balanced chemical equation can be defined as a chemical equation wherein the number of atoms on the reactant (left) side is equal to the number of atoms on the product (right) side.
Next, we would write the properly balanced chemical equation for this chemical reaction:
3/2O₂ -----> 2/2O₃
Therefore, the enthalpy of reaction (ΔH) of the above chemical reaction is half the enthalpy of reaction (ΔH) of the initial chemical reaction:
Enthalpy of reaction (ΔH) = ½ × -286 kJ/mol
Enthalpy of reaction (ΔH) = -143 kJ/mol.
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How many minutes would be required to produce a mass of 6. 38 g al using a current of 12. 50 amps?
To produce a mass of 6. 38 g al using a current of 12. 50 amps the time required would be 7207.4 minutes.
What is faraday law?It states that the chemical which is getting decomposed because of the flow of current within an electrolyte is directly proportional to the quantity of electricity passing through it.
W= Z × I × t Z = 1 coulomb
I = current
t = time
substituting the values
Z= 96500/Eq.wt
Al 3+ +3e − →Al n= 3
so, Eq= 27 / 3 = 9
t = W × Z / I
t = 9 × 96500 / 12.50
t = 7207.4 minutes.
Therefore the time required would be, 7207.4 minutes.
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A solution is made by dissolving 6.93 grams of lead(II) nitrate into about 50 mL of water. The volume is then precisely brought up to 100 mL and the solution is saved as stock solution. A 50.0 mL aliquot* of this stock solution is then titrated with 0.222 M sodium phosphate. What would be the minimum number of milliliters (mL) of the the phosphate solution that are needed to completely precipitate (knock out) all the lead in this aliquot? (tolerance is ±0.1 mL)
6.32mL of phosphate solution is needed to completely neutralize the lead in this reaction.
What is a neutralization reaction?A neutralization reaction is defined as the reaction between an strong acid and strong base to produce a salt and water.
The process of the reacting given volume of acids or bases for the determination of the concentration or volume of the acid or base which is required for neutralization is known as titration in volumetric analysis.
The formula used to determine the volume of the acid is given below:
(Ca × Va) /(Cb × Vb) = Na/Nb
where,
where Ca is the concentration of lead nitrate
Cb is the concentration of sodium phosphate
Va is the volume of lead nitrate
Vb is the volume of sodium phosphate
Na is the moles of lead nitrate
Nb is the moles of sodium phosphate
Concentration of lead nitrate = m/V
= 6.931/(0.1 × 331.2)
= 0.0281 M
Ca = 0.222M
Cb = 0.0281M
Na = Nb = 1
Va = ( 0.0281 × 50) /0.222
= 6.32 mL.
Thus, 6.32mL of phosphate solution is needed to completely neutralize the lead in this reaction.
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Calculate the kf of ag(nh3)2 from ag (aq) e- ⇋ ag(s) e0= 0. 81 v ag(nh3)2 (aq) e- ⇋ ag(s) 2nh3(aq) e0= 0. 39 v enter number as e notation (e. g. 2. 34e6 or 4. 56e-4)
The kf of Ag(NH₃)₂ for the given equation is 2.786 x 10⁷.
What is kf value?kf value can be calculated by dividing the molal concentration with the freezing point of depression.
The reaction are given:
Ag+(aq) + e- ⇋ Ag(s) E0= 0.81 V
Ag(NH₃)₂ +(aq) + e- ⇋ Ag(s) + 2NH₃(aq) E0= 0.37 V
To get Kf of Ag(NH₃)₂ we will rearrange the above written equations
a. Ag +(aq) + e- ⇋ Ag(s) E0= 0.81 V
b. Ag(s) + 2NH₃(aq) ⇋ Ag(NH₃)₂ +(aq) + e- E0= - 0.37 V
Adding equation (a) and equation (b) we will get
Ag +(aq) + 2NH₃(aq) ⇋ Ag(NH₃)₂ + (aq) Eo = 0.81 -0.37 = 0.44 V
By the Ernst equation,
E = E° - 0.0591 logkf
Now Kf is calculated at equilibrium and at equilibrium E = 0,
The number of transfer of electron is 1 ( 1 e-) , n=1
E° = 0.44 V
Substituting all the values in Ernst equation
0 - 0.44 - 0.0591/ 1 logkf
logkf = 0.44/ 0.0591
kf = 10 (0.44/ 0.0591)
Kf = 2.786 x 10⁷
Hence, Kf of Ag(NH₃)₂ for the given equation is 2.786 x 10⁷.
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Simon measured the density of a piece of metal
to be 11.70 g/cm³. However, the manufacturer
claims it has a density of 12.00 g/cm³. What is
the percent error of Simon's measurement?
From the question we know that 12 - 11.70 = 0.3 so 0.3 / 12 = 0.025 therefore Simon's percent error is 2.5%.
Percent error compares an estimate to an accurate value and expresses the difference among them as a percent. This statistic lets analysts recognize the scale of the mistake relative to the true cost. it's also referred to as percentage error as well as % mistakes.
Percentage errors Calculation Steps :
Subtract one cost from another.Divide the mistake by the exact or ideal price (not your experimental or measured value).Convert the decimal variety into a percentage by multiplying it by using 100.Add a percent or % symbol to record your percentage mistakes value.Percentage error tells you the way huge your mistakes are when you degree something in an experiment. Smaller values suggest that you are close to the accepted or actual value. for instance, a 1% blunder means that you obtain very near the accepted value, whilst 45% means that you were pretty a long way off from the real value.
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What products are formed in the following reaction
The correct product from this reaction is the structure in option D.
What is a secondary amine?An amine is a compound that contains an alkyl group and an amino group. We know that we can obtain an amine from ammonia by replacing one or more hydrogen atoms with alkyl groups.
The compound as shown here is a secondary amine because two hydrogen atoms have been replaced with alkyl groups. We know that the reaction between the HCl and the amine produces an ionic compound owing to the fact that the nitrogen and the hydrogen from HCl are involved in a Dative bond.
As such, the correct product from this reaction is the structure in option D.
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number of oxygen atoms in 16 g of So2??
Now , we know that one mole of SO² Contains 2 Moles ( two ) of atoms of oxygen . Hence , 16 Grams of SO² Contains 0.5 Mole(s) of Oxygen
0.5
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9.0 mol Na2S can from 9.0 mol CuS and 8.0 mol CuSO4 can form 8.0 mol Cus.
What mass of Cus forms during the reaction?
Cus; 95.62 g/mol
Answer:
765.0 grams CuS
Explanation:
The limiting reagent is the reactant which completely reacts before the other reactant(s) is used up. When 9.0 moles Na₂S and 8.0 moles CuSO₄ react, it appears that CuSO₄ is the limiting reagent. You can tell because it results in the production of less product.
You can determine the mass of CuS by multiplying the moles by the molar mass. It is important to arrange the ratio in a way that allows for the cancellation of units.
Molar Mass (CuS): 95.62 g/mol
8.0 moles CuS 95.62 g
------------------------- x ----------------------- = 765.0 grams CuS
1 mole
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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A solution of naf is added dropwise to a solution that is 0.0122 m in ba2 . when the concentration of f- exceeds ________ m, will precipitate. neglect volume changes. for , ksp = 1.7 x 10-6. 4. calculate the ph of a solution prepared by dissolving 0.270 mol of weak acid ha (ka = 1.77 x 10-4) and 0.260 mol of its conjugate base in water sufficient to yield 1.00 l of solution.
A solution of NaF is added to a solution that is 0.0144 M in Ba²⁺. When the concentration of F- exceeds 0.011 m, BaF₂ will precipitate.
Let's consider the solution of BaF₂.
BaF₂(s) ⇄ Ba²⁺(aq) + 2 F⁻(aq)
We can use the solubility product constant (Ksp) to find the equilibrium concentration of F⁻ when [Ba²⁺] is 0.0144 M.
When [F⁻] exceeds 0.011 M, BaF₂ will precipitate.
A solution of NaF is added to a solution that is 0.0144 M in Ba²⁺. When the concentration of F- exceeds 0.011 M, BaF₂ will precipitate.
What is BaF₂.?
BaF2 crystallizes in the cubic Fm3m space group and has a fluorite structural makeup. Eight comparable F1 atoms and Ba2+ are joined in a cubic shape with the body in the middle. The average Ba-F bond length is 2.72. Four comparable Ba2+ atoms are joined with F1 to create a mixture of corner- and edge-sharing FBa4 tetrahedra.Learn more about BaF2 crystallizes
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The energy of the ground state in the bohr model is -13. 6 ev. the energy of the n = 2 is:_______
Bohr's model explained the position of the electron, proton, and neutron in the atom of the element. The energy at the n = 2 level of the atom will be - 3.40 eV.
What is the principal quantum number (n)?The principal quantum number (n) has been the distance of the electron of that atom in the nucleus and its energy in the structure. It can also be said to define the size of the atomic orbit.
n = 2 is the first excited state whose energy is calculated as:
Eₙ = − 13.6 ÷ n² eV
E₂ = - 13.6 eV ÷ 2²
= -3.40 eV
Therefore, -3.40 eV is the energy of electron at n = 2.
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A current of 5. 68 a is passed through a Fe(NO3)2 solution. How long, in hours, would this current have to be applied to plate out 7. 20 g of iron?
There are 1.2 hr would this current have to be applied to plate out 7. 20 g of iron .
Calculation ,
Given ; Current ( I ) = 5. 68 A
In [tex]Fe(NO_{3} )_{2}[/tex] , the valancy of Fe is +2 .
2 moles of [tex]e^{-}[/tex] are required for the decomposition of 1 mole of Fe .
7. 20 g of Fe in moles = 7. 20 g /55.845 g/mol =0.12 mole
x moles of [tex]e^{-}[/tex] are required for the decomposition of 0.128 mole of Fe .
moles of [tex]e^{-}[/tex] are required = 0.256 moles
Charge on 1 mole of [tex]e^{-}[/tex] = 96500 C
Charge on 0.256 mole of [tex]e^{-}[/tex] = 24704 C
Current ( I )= Q/t
t =Q / I = 24704 C/5. 68 A = 4349 sec = 1.2 hr
Therefore , there are 1.2 hr would this current have to be applied to plate out 7. 20 g of iron .
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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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To use the gas law constant r = 0.0821, the unit for temperature should be kelvin and the unit for pressure should be atmospheres. true false
The given statement "To use the gas law constant R=0.0821 the unit for temperature should be kelvin and the unit for pressure should be atmospheres" is -----true.
What is the ideal gas law?
The ideal gas law tells us about behavior of ideal gas through a equation and postulates.The ideal gas law is considered as ideal gas equation.
The ideal gas equation is given as.
PV = nRT
where,
P is pressure of the gasV is volume occupied by the gasn is number of moles of ideal gasT is temperatureR is constant known as universal gas constant.The value of R depends upon units of temperature, pressure and volume.
Why is Kelvin used in gas laws?
The Kelvin scale is used in gas law problems because the pressure and volume of a gas depend on the kinetic energy or motion of the particles.
How are pressure and Kelvin temperature related?
It states that, at a constant volume, the pressure of a given amount of a particular gas is directly proportional to its Kelvin temperature. It can be written as: P ∝ T, or. P/T = k where k is a constant,
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