Answers
The energy of a photon that would move an electron from level 2 to level 5 : B. 4.8 eV
Further explanationThe electron energy at the nth shell can be formulated:
En = -Rh / n²Rh = constant 2.179.10⁻¹⁸ J
So the electron transfer energy (ΔE)
ΔE = E final- E initial
energy at n=2(level 2) = -5.3 eV
energy at n=5(level 5) = -0.5 eV
So the energy absorbed :
[tex]\tt \Delta E=-0.5-(-5.3)=-0.5+5.3=4.8`eV[/tex]
The energy required to move an electron from level 2 to level 5 is 4.8 eV.
According to the Bohr model of the atom, an electron moves from a lower to a higher energy level when it absorbs energy. The same energy is released when the atom returns to ground state.
When an electron from level 2 to level 5, the energy of the photon required is;
ΔE = E5 - E2 = -0.5eV - (-5.3eV)
ΔE = 4.8eV
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Related Questions
Please help with these questions ASAP will give brainlist!! CHEMISTRY
1.) A sample of nickel is heated to 95.0°C and placed in a coffee-cup calorimeter. If the 50.0 g of water in the calorimeter is initially 22.3°C and warms to 25.4°C, what mass of nickel was heated? (The specific heat of nickel is 0.444 J/°C g and water is 4.18 J/°C g.)
21.0 g
15.4 g
2.1 g
57.5 g
2.)What is the entropy change associated with the chemical reaction that occurs when iron oxide is converted to its metal form?
Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)
Positive
Zero
Cannot be determined
Negative
3.)The ΔH of the reaction below is -575.13 kJ. Is this reaction spontaneous?
2ZnS + 3O2 + C → 2SO2 + 2Zn + CO2
It is not because the ΔH of the reaction is negative.
It is because the ΔH of the reaction is negative.
It depends on the temperature because the ΔH of the reaction is negative and the ΔS is negative.
It depends on the temperature because the ΔH of the reaction is negative and the ΔS is positive.
4.) In the cell, the hydrolysis of ATP (adenosine triphosphate) into ADP (adenosine diphosphate) and a phosphate group has a ΔG of -50 kJ/mol. The reaction to convert glucose and a phosphate group into glucose-6-phosphate has a positive ΔG, but can be coupled with ATP hydrolysis to produce a spontaneous reaction. What can you infer about the formation of glucose-6-phosphate?
ATP → ADP + P; ΔG = -50 kJ/mol
Glucose + P → Glucose-6-phosphate; ΔG = + ?
The ΔS of the reaction that converts glucose and a phosphate into glucose-6-phosphate is positive.
The ΔG of the reaction that converts glucose and a phosphate into glucose-6-phosphate has a ΔG between 0 and +50 kJ/mol.
The ΔG of the reaction that converts glucose and a phosphate into glucose-6-phosphate has a ΔG between 0 and -50 kJ/mol.
The reaction will never occur in the cell.
Answers
Answer:
Question 1 is 21.0g
Explanation:
50 x 4.18 x 3.1 / 0.444 / 69.6= 21.0
which of the following is true of the instinct approach to motivation
Answers
10. INFER: Why can the reactant in a
decomposition reaction never be an element?
Answers
Answer:
Because elements cannot decompose
Explanation:
Elements are distinct substances that cannot be split-up into simpler substances. Such substances are only made up of one atom.
An atom is the smallest indivisible particle of substance that can take part in chemical reaction. By chemical means, an atom cannot be broken down. Therefore, an element cannot break down during decomposition reaction. A decomposition reaction is one in which a substance breaks down into two or more products.A. 1
B. 2
C. 3
D. 4
_______________________________________________________
Answers
A hutch weighs 150 lbs and it’s base has a length and width of 15 in and 34 in, respectively. What is the pressure exerted by the hutch on the floor?
Answers
Answer:0.29
Explanation:
To determine the pressure of the hutch on the floor, we must first calculate the area of the base of the hutch.
A=lw=(15in.)(34in.)=510in.2
We can now use the formula to calculate pressure.
P=FAP=150lbs510in.2P≈0.294lbin.2
Rounding to two significant figures, the pressure exerted by the hutch on the floor is 0.29lbin.2.
In both endothermic and exothermic processes, energy is
Answers
Answer:
involve the transfer of energy
Explanation:
in endothermic requires the input of energy whereas in exothermic it release energy upon completion.
For the reaction:
Agl(s) + V2Br2(g) AgBr(s) + /12 ()
AH° = -54.0 kJ
And:
AH® for AgBr(s) = -100.4 kJ/mol
AH° for Br2(g) = +30.9 kJ/mol
Therefore value of AH for Agl(s) must be:
+61.8 kJ/mol.
-61.8 kJ/mol.
O-123.5 kJ/mol.
+77.3 kJ/mol.
O-77.3 kJ/mol.
Answers
Answer:
0-77.3kj/mol
Explanation:
add all of the mole
Select all the the abiotic factors that could impact a deer population.
Group of answer choices
Water
Other Organisms
Weather
Flies bringing disease
Answers
Answer:
Water
Weather
Explanation:
In an ecosystem, the factors that affect the organisms in that ecosystem can either be BIOTIC OR ABIOTIC. Biotic factors refers to the living components of an ecosystem while the ABIOTIC factors refer to the non-living components of the ecosystem.
According to this question, the abiotic (nonliving) factors that can affect a deer population includes WATER AND WEATHER. Note that the other options including flies and other organisms are both biotic factors.
how fast is a formula 1 car? (For my chemistry project)
Answers
Answer:
it's 200 mph fast........
Carbon doesn't have a charge because it doesn't generally share or donate electrons.
*
True
O
False
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Answer:
Correct me if i'm wrong but i'm pretty sure its FALSEExplanation:
Its because In a single bond, two carbon atoms share one pair of electrons. In a double bond, they share two pairs of electrons, and in a triple bond they share three pairs of electrons.K2CrO4 + Ba(NO3)2 = BaCrO4 +2 KNO3
If 5.0 grams of K2CrO4 are put into a reaction, how many grams of BaCrO4 will be produced
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one parent has type AB blood while the other has Type O blood.Which two blood type could their children have?
Answers
A mother who is blood type O can only pass an O allele to her son or daughter. A father who is blood type AB could pass either an A or a B allele to his son or daughter. This couple could have children of either blood type A (O from mother and A from father) or blood type B
When 1.00 mole of NH4NO3 dissolves in water, the enthalpy change is ΔH = + 25.7 kJ. What is the enthalpy change if 17.5 grams of NH4NO3 are dissolved
Answers
Answer:
5.62 kJ
Explanation:
Let's consider the thermochemical equation for the dissolution of ammonium nitrate.
NH₄NO₃(s) ⇒ NH₄⁺(aq) + NO₃⁻(aq) ΔH° = 25.7 kJ
25.7 kJ are absorbed per 1.00 mole of NH₄NO₃. The enthalpy change when 17.5 g of NH₄NO₃ (M: 80.04 g/mol) are dissolved is:
17.5 g × 1 mol/80.04 g × 25.7 kJ/mol = 5.62 kJ
Considering the rule of three, if 17.5 grams of NH₄NO₃ are dissolved, the enthalpy change is 5.62 kJ.
In first place, the rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
That is, what is intended with it is to find the fourth term of a proportion knowing the other three.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied.
To solve a direct rule of three, the following formula must be followed, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: [tex]x=\frac{cxb}{a}[/tex]
Being 80 g/mole the molar mass of NH₄NO₃, that is, the amount of mass that a substance contains in one mole, the number of moles that 17.5 g of the compound contain is calculated as:
[tex]17.5 gramsx\frac{1 mole}{80 grams} =[/tex] 0.21875 moles
Then it is possible to apply the following rule of three: if when 1.00 mol of NH₄NO₃ dissolves in water the enthalpy change is ΔH =+25.7 kJ, when 0.21875 moles of the compound dissolves in water, the enthalpy change will have what value?
[tex]enthalpy change=\frac{0.21875 molesx25.7 kJ}{1 mole}[/tex]
enthalpy change= 5.62 kJ
Finally, if 17.5 grams of NH₄NO₃ are dissolved, the enthalpy change is 5.62 kJ.
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Answers
Answer:
energy and the equilibrium constant.
The sign of the standard free energy change ΔG° of a chemical reaction determines whether the reaction will tend to proceed in the forward or reverse direction.
Similarly, the relative signs of ΔG° and ΔS° determine whether the spontaniety of a chemical reaction will be affected by the temperature, and if so, in what way.
ΔG is meaningful only for changes in which the temperature and pressure remain constant. These are the conditions under which most reactions are carried out in the laboratory; the system is usually open to the atmosphere (constant pressure) and we begin and end the process at room temperature (after any heat we have added or which is liberated by the reaction has dissipated.) The importance of the Gibbs function can hardly be over-stated: it serves as the single master variable that determines whether a given chemical change is thermodynamically possible. Thus if the free energy of the reactants is greater than that of the products, the entropy of the world will increase when the reaction takes place as written, and so the reaction will tend to take place spontaneously. Conversely, if the free energy of the products exceeds that of the reactants, then the reaction will not take place in the direction written, but it will tend to proceed in the reverse direction.
A common misconception people have is that sugar is energy and energy is sugar but you know better. Give me ideas of a clear explanation that could be used to clear up this misconception, please?????!!!!!!
Answers
A typical coffee mug holds about 355,000 microliters of liquid. How many kiloliters of liquid does this mug hold expressed in standard Scientific notation?
Answers
Answer:
[tex]3.55\times 10^{-4}\ kL[/tex]
Explanation:
Given that,
A typical coffee mug holds about 355,000 microliters of liquid.
[tex]1\ \mu L=10^{-6}\ L[/tex]
Also, 1 L = 0.001 kL
[tex]10^{-6}\ L=0.001\times 10^{-6}\ kL\\\\=10^{-9}\ kL[/tex]
So, a typical coffee mug holds about [tex]355000 \times 10^{-9}\ kL[/tex] or [tex]0.000355\ kL[/tex] of liquid.
We need to convert it into Scientific notation.
We will shift 4 zeros to right. As a result,
[tex]V=3.55\times 10^{-4}\ kL[/tex]
So, the mug will hold [tex]3.55\times 10^{-4}\ kL[/tex] of liquid.
A J-shaped tube, closed at one end, is depicted in the figure at the right. It contains N2 gas that is trapped by an unknown liquid whose density is twice as large as that of mercury. The other end of the tube is open to the air. The value of h is measured to be 10 mm at sea level on a clear day at a temperature of 27°C. The atmospheric pressure is 1.00 atm. Assuming the vapor pressure of the liquid is zero, what is the concentration of the N2 gas trapped inside the J-shaped tube?
Answers
Answer:
the amount of concentration is about 23.9 grams of concentration you might want to add some hydrochloric acid to get the acidity to about 7 or seven depending on what you are doing
Balance equation how many reactants and products?
Answers
Answer:
In balanced equation:
reactants of Zn = 1
reactants of Cl = 2
products of Zn = 1
products of Cl = 21
Match Term Definition
Pure substance A) Liquid homogeneous mixture in which the solute is distributed evenly within the solvent
Heterogeneous B) Mixture that has its different components mixed evenly within the substance
Homogeneous C) Mixture that has its different components mixed unevenly within the substance
Solution D) Consists of a single element or type of compound
Answers
Answer:
b
Explanation:
this should help
2. Molecular solutions do not conduct electricity because they contain: *
(1 Point)
Answers
The ions are able to move freely from one place to another. So that they conduct electricity. But the molecular solutions does not electricity.
What is a molecular solution?The molecular solution is composed of molecules and consists of non - metallic atoms. These atoms are held together by the covalent bonds. The flow of charged particles is responsible for the conduction of electricity. If there is no flow of electrons or ions then there will be no electricity.
In the molecular solutions, the molecules present are not dissociated into respective ions. Since the molecules are not converted into the charged particles no electricity is produced.
A molecular solution is regarded as a non-electrolyte which does not contain ions. But electrolytes are dissociated into ions and thereby conducts electricity. So all electrolytes are good conductors of electricity.
Thus molecular solution does not contain ions.
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Which of the following compounds will be most soluble in ethanol (CH3CH2OH)? Question 16 options:
a. trimethylamine (N(CH3)3)
b. acetone (CH3COCH3)
c. ethylene glycol (HOCH2CH2OH)
d. hexane (CH3CH2CH2CH2CH2CH3)
e. None of these compounds should be soluble in methanol.
Answers
Answer:
c. ethylene glycol (HOCH2CH2OH)
Explanation:
Ethylene glycol is polar in nature. The -OH groups in it are able to form hydrogen bond with ethanol molecule, which makes it soluble in ethanol.
A chemical compound is a combination of different elements that are held together by chemical bonds.
Ethanol is an organic chemical compound that is known as simple alcohol.
It is naturally produced when sugar is fermented by yeast.
The compound that will be most soluble in ethanol is ethylene glycol (HOCH2CH2OH). This is because this compound is polar in nature and has the ability to form hydrogen bond and makes it soluble in ethanol.
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Write a description of your dream car by using powerful adjectives. Write about 100-120 words
Answers
Answer:
It was a cold December night shortly after dusk, a likely setting for an event that would prove to be life altering. As fate would have it, this would be the night that I lost the material possession that truly meant the most to me. I would lose the one thing that gave me much pride and joy and excitement. I often think back and liken us to a newlywed couple, for we had only been together for 18 months and were still very much honeymooning. It was a night, a moment, that even now scoffs and mocks me as I travel thither and yonder with her replacement. But she can never be truly replaced and to call my current fix a replacement seems like a sort of blasphemy.
I called her my Blue Angel. That's right! She was a brand new 1999 Atlantic blue Ford Mustang fully equipped with white racing stripes on each side, dark window tint, a rear spoiler, and a post-factory sound system that I installed personally just to complete the "dream ride" effect. We met on April 24, 1999,when my parents introduced us and told me she was all mine as a reward for graduating high school as valedictorian. And what a reward she turned out to be. We went everywhere together. I took her out to eat. When I'd go play ball somewhere, she went with me. Every day from April 24, 1999, to December 22, 2000, we were together. We were bonding in a way a young man can bond with no other, and there truly was no other for me. Other guys had bigger trucks and faster cars, but where my Blue Angel was lacking in size and power, she more than made up for in pure, unadulterated, raw emotion, She never let me down; she was always looking her best and never longing for attention from me or any of the other countless admirers and fans she won over for...
Explanation:
PLEASE ANSWER PLEASE
Answers
A scientist performs an experiment involving the collision of two masses on a flat surface. She believes she has made a startling discovery: the total kinetic energy is not conserved. What might she have overlooked?
A.
Some gravitational potential energy may have been gained.
B.
Some gravitational potential energy may have been lost.
C.
Some energy may have been gained due to friction and/or sound.
D.
Some energy may have been lost due to friction and/or sound.
Answers
Answer:
c
Explanation:
i don’t understand but i need help asap
Answers
Answer:
c
Explanation:
I think I remember this from last year
21. Identify which statement below is a hypothesis, and explain why.
How could you determine whether the hypothesis is correct?
a. Ocean water is too salty.
b. Water heats faster if it contains salt.
C. Space probes have discovered small amounts of water on the moon.
Answers
Answer:
B
Explanation:
A factory produces their product at a rate of 102 kg/hr. How many lb/day of the product are produces? (453.6 g = 1 lb)
Answers
If 25.0g solid iron (III) sulfide reacts with 25.0g gaseous hydrogen chloride to form solid iron (III) chloride
and 5.61g hydrogen sulfide gas, what is the percent yield of the reaction?
(Please show work)
Answers
Answer:
[tex]Y=48\%[/tex]
Explanation:
Hello!
In this case, since the described chemical reaction is:
[tex]Fe_2S_3+6HCl\rightarrow 3H_2S+2FeCl_3[/tex]
We can see the 6:2 mole ratio between hydrogen chloride (molar mass = 36.46 g/mol) and hydrogen sulfide (molar mass = 34.09 g/mol) and 1:3 between iron (III) sulfide (molar mass = 207.91 g/mol) and hydrogen sulfide. In such a way, we can compute the yielded moles of hydrogen sulfide by each reactant in order to identify the limiting one:
[tex]n_{H_2S}^{by HCl}=25.0gHCl*\frac{1molHCl}{36.46gHCl}*\frac{3molH_2S}{6molHCl} =0.343molH_2S\\\\n_{H_2S}^{by Fe_2S_3}=25.0gFe_2S_3*\frac{1molFe_2S_3}{207.91gFe_2S_3}*\frac{3molH_2S}{1molFe_2S_3} =0.361molH_2S[/tex]
It means that the HCl is the liming reactant as it produces less moles of hydrogen chloride than the iron (III) sulfide. Therefore, the theoretical yield in grams is:
[tex]m_{H_2S} =0.343molH_2S_2S*\frac{1molH_2S}{34.09gH_2S}\\\\m_{H_2S}=11.7g[/tex]
Thus, the percent yield is:
[tex]Y=\frac{5.61g}{11.7g}*100\%\\\\Y=48\%[/tex]
Best regards!
What is pure convalent bond
Answers
Answer:
Pure covalent bonds exist between two atoms with the same electronegativities. A pure covalent bond has no ionic character at all. Diatomic elements are good examples of pure covalent bonds where the electrons are evenly shared between both nuclei.
Explanation:
Hope this helped!
state the difference between spermatozoon and spermatogonium
Answers
Answer:
spermatozoon:A spermatozoon is a motile sperm cell or moving from of the haploid cell that is the male gamete.
spermatogonium : A cell produced at an early stage in the formation of spermatozoa, formed in the wall of a seminiferous tuble and giving rise by mitosis to spermatocytes.