In the Bohr model of the hydrogen atom, the electron occupies distinct energy states. One transition between energy states of the hydrogen atom is represented by the picture on the left.
1. In this transition an electron moves from the n = level to the n = level.
2. Energy is_______ in this process.
A. Absorbed
B. Emitted
3. The electron moves ___________ the nucleus.
A. Closer to
B. Further from
Answers
Answer:
1. ELECTRON MOVES FROM THE n = 4 to n = 1 LEVEL
2. ENERGY IS EMITTED
3. THE ELECTRON MOVES CLOSER TO THE NUCLEUS
Explanation:
the question is incomplete as the picture is not shown but here is the picture and the solution.
Bohr model of the hydrogen atom shows that electrons would not emit energy but emit or absorb protons as it moves to a lower or higher energy levels respectively. In this question as shown in the picture below, the hydrogen atom moves from energy level 4 to energy level 1 and in such transition, energy is emitted and returns to its ground state after been excited to a higher level o n equals to 4. The energy emitted follows the law of conservation of energy. That is the amount of energy needed to excite the atom to a higher level is emitted upon transition back to the ground state.
The size of the hydrogen atom will also reduce and the electron will move closer to the nucleus. This is because as energy increases, the electron is found at a greater distance away from the nucleus and vice versa. And as the electron moves farther away the electrostatic force between it and the nucleus reduces and it is loosely held by the nucleus and vice versa, As the case of the question, the electron moves closer to the nucleus and it is strongly attached to the nucleus due to increase electrostatic attraction between it and the nucleus.
Answer:
In this transition, energy is emitted
The electron moves closer to the nucleus
Explanation:
In the Bohr's model of the atom, electrons occupy specific energy levels shown by the principal quantum number. An electron that is stationary in its orbit does not radiate energy.
However, an electron may absorb energy and be excited to higher energy levels or emit energy when descending from a higher to a lower energy level. This energy is usually observed as a photon of light of appropriate wavelength and frequency.
In the image, the electron descends from energy level n=4 to energy level n=1. Since it has moved from a higher to a lower energy level, energy is emitted. Recall that energy levels increase outwards from the nucleus. Since n=1 is closest to the nucleus, the electron has moved closer to the nucleus. Hence the answers above.
Related Questions
21 POINTS TO WHO EVER CAN ANSWER THIS
Explain why water is considered the "universal solvent".
Answers
Answer:
Explanation:
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. And, water is called the "universal solvent" because it dissolves more substances than any other liquid. This allows the water molecule to become attracted to many other different types of molecules.
A box of pills claims that they will make your cold go away sooner. Who
would be the most impartial source for information on this claim?
A. The company that makes the medicine
B. The store that sells the medicine
C. A company that makes a competing medicine
.
D. A university study that tests medicine
Answers
Answer:D
Explanation:
prop-1-yne + 2HBr/H2O2 = A;
A + 2H2O = B;
B + K2CO3(aq) = C;
C + heat = D;
D + HBr = E.
find the compounds A, B, C, D and E
Answers
Based on the given reactions, the compounds are as follows:
A: The specific product formed from the reaction between prop-1-yne and either 2HBr or H2O2.
B: The product formed when compound A reacts with 2H2O.
C: The product formed when compound B reacts with K2CO3(aq).
D: The product formed from the heat-induced reaction of compound C.
E: The product formed when compound D reacts with HBr.
Based on the given reactions, let's analyze the compounds involved:
Reaction 1: prop-1-yne + 2HBr/H2O2 = A
The reactant prop-1-yne reacts with either 2HBr or H2O2 to form compound A. The specific product formed will depend on the reaction conditions.
Reaction 2: A + 2H2O = B
Compound A reacts with 2H2O (water) to form compound B.
Reaction 3: B + K2CO3(aq) = C
Compound B reacts with K2CO3(aq) (potassium carbonate dissolved in water) to form compound C.
Reaction 4: C + heat = D
Compound C undergoes a heat-induced reaction to form compound D.
Reaction 5: D + HBr = E
Compound D reacts with HBr (hydrobromic acid) to form compound E.
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Lewis structure AgBr2
Answers
Answer:
Br-Ag-Br
Explanation:
When lead (II) nitrate reacts with sodium iodide, sodium
nitrate and lead (II) iodide are formed. If you start with 25.0
grams of lead (II) nitrate and 15.0 grams of sodium iodide, how
many grams of sodium nitrate can be formed?
Answers
Answer:
20.44 grams of sodium nitrate can be formed
Explanation:
The balanced chemical equation for the reaction between lead (II) nitrate and sodium iodide is:
Pb(NO3)2 + 2NaI → 2NaNO3 + PbI2
3. Skunks run about 10 miles per hour and won't try to outrun a predator. Instead, they
will spray their attacker with a stinky, oily mist that can travel up to 4.5 meters away. If
the spray travels through the air at 3 m/s, then how long (time) will it take the stinky oil
to hit their target?
Solve
Answers
Mathematically time taken to travel is the ratio of distance to velocity. If the spray can travel about 4.5 meters with a velocity of 3 m/s, the time taken to hit the target is 1.5 s.
What is velocity?
Velocity is the rate of speed that is, the distance travelled in meter per second. Mathematically, it is written as the ratio of distance travelled to the time taken.
Given that the distance that can be travelled by the spray is 4.5 meters and the velocity of the spray in air is 3 m/s. The time taken for the travel of spray jet is calculated by taking the ratio of distance and velocity.
The time taken to travel is calculated as follows:
Time taken = Distance/ velocity
= 4.5 meter/ 3 m/s
= 1.5 s.
Hence, the time that the spray takes to hit the target by travelling 4.5 meters in 3 m/s is 1.5 s.
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1. Hexanoic acid, a carboxylic acid, dissolves in 1 M NaOH. Fill in the blank for the missing species:
(Structure of Hexanoic acid) + 1M NaOH-------> …………………………… + …………..
water insoluble ---------->. water soluble salt
2. To retrieve the original carboxylic acid from its salt (Problem 1 above), add 6 M HCl to it. Fill in the blank for the missing species:
…………………………. + 6M HCl ---------->.……………………….. + ………..
Answers
(Hexanoic acid) + 1M NaOH ---> sodium hexanoate + H2O and water soluble salt -------> Hexanoic acid + water.
When 1M NaOH (Sodium hydroxide) is added to hexanoic acid, it reacts with the carboxyl group of the acid to form a salt. The carboxyl group of hexanoic acid has a negative charge, so the carboxyl group will be neutralized by the positive charge of the sodium ion in NaOH. This reaction produces a water-soluble salt, sodium hexanoate, and water. The sodium hexanoate is insoluble in water, so the salt and the water are separated.
Water soluble salt + 6M HCl ----------> Hexanoic acid + water. The hydrochloric acid will react with the water soluble salt to produce the original carboxylic acid and water. The carboxyl group (-COOH) of the carboxylic acid will react with the hydrogen ion (H+) of the hydrochloric acid, forming the original carboxylic acid and water.
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What is the numerical value of Kc for the following reaction if the equilibrium mixture contains 0.034 M N2O4 and 0.20 M NO2 ?N2O4(g)⇌2NO2(g) Express your answer to two significant figures.
Answers
The equilibrium constant Kc is the value that relates the molar concentrations of reactants and products. For a reaction with the following general balanced equation: aA+bB-->cC+dD, the value of the constant in equilibrium will be:
\(Kc=\frac{{}[C\rbrack^c[D\rbrack^d}{[A]^a[B]^b}\)The square brackets represent the molar concentrations of the compounds.
Now, for this reaction we have 1 reactant and 1 product (aA--->cC), the equilibrium equation will then be:
\(Kc={}\frac{\lbrack NO_2\rbrack^2}{\lbrack N_2O_4\rbrack^1}\)If we replace the molar concentrations we will then have Kc:
\(Kc=\frac{\lbrack0.20M\rbrack^2}{\lbrack0.034M\rbrack}\)\(Kc=\frac{\lbrack0.20M\rbrack^2}{\lbrack0.034M\rbrack}=1.2M\)Answer: The numerical value of Kc of the reaction is 1.2M
Give two industrial uses of water
Answers
Answer:
Explanation:
i) in keeping industrial machine cool
ii) in textile inustries for dying clothes
How do organelles work together to make a cell function?
Answers
Answer:
Protein Power
Much of a cell's efforts go toward making proteins. Proteins carry out many important functions in the body. ... Cell organelles must work together to carry out protein synthesis, utilize proteins within the cell, and transport them out of the cell.
Question:
What is true about a
dependent variable?
Answers:
It is graphed on
the y-axis
Color LIGHT BLUE
It is used for
comparison
Color BLACK
It is purposely
changed
Color PURPLE
Answers
A balloon with a volume of 0.5L at 293K is cooled to 20K. What is the balloon's new
volume?
Answers
Answer:
0.03 L
Explanation:
Step 1: Given data
Initial volume of the balloon (V₁): 0.5 LInitial temperature of the balloon (T₁): 293 KFinal volume of the balloon (V₂): ?Final temperature of the balloon (T₂): 20 KStep 2: Calculate the final volume of the balloon
The balloon is filled with air. If we assume it behaves as an ideal gas, we can calculate the final volume of the balloon using Charles' law.
V₁/T₁ = V₂/T₂
V₂ = V₁ × T₂/T₁
V₂ = 0.5 L × 20 K/293 K = 0.03 L
A small amount of chemical splashes in Frank’s eye. What should Frank do immediately?
Answers
Answer:
A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.
Explanation:
Brainlist
The pH at the equivalence point of a titration may differ from 7.0 due to:_______.
Answers
Answer:
hydrolysis of the resulting salt
Explanation:
The pH at the equivalence point of a titration is not always 7.0 due to the hydrolysis of resulting salt.
The pH at the equivalence point of a titration involving a strong acid and a strong base will be 7 because the conjugate base of the salt formed will be too weak to react with water. For example, the titration of HCl and NaOH:
\(HCl + NaOH --> NaCl + H_2O\)
In the case of strong acid and weak base, the pH at the equivalence point will be acidic because the salt formed would dissociate and react with water. For example, the titration of HCl with NH3:
\(NH_3+HCl-->NH_4Cl\)
The resulting salt dissociates in water and releases proton to form an acidic endpoint.
\(NH_4^{+} + H_2O --> H_3O^+ + NH_3\)
For weak acid and strong base, the pH at the equivalence point will be alkaline because the resulting salt dissociates in water to form an alkaline solution.
\(NaOH + CH_3COOH --> CH_3COONa + H_2O\)
\(CH_3COO^- + H_2O --> CH_3COOH + OH^-\)
In order to ice to melt it must absorb heat This makes it an blank process.
A) Endothermic
B) exothermic
C) integral
D)Kinematic
Answers
Answer: A. Endothermic
Explanation:
In an endothermic reaction, heat is sucked in from the surrounding area by the reactants so that they may use it to react and form new products. This will therefore reduce the temperature in the said surrounding by the amount that the reaction needed.
This is what ice does when it melts. It sucks in the heat surrounding the area and then melts but leaves the area colder. For instance, putting ice in water ensures that the ice melts but because it sucked in the heat from the water to do so, the water gets colder as a result.
Why do all elements have their own unique color? Please explain.
Answers
All the element have their own unique color because the every element have their own set of energy levels.
According to the bohr model of atoms : electrons exist at certain energy levels. when we give heat to electron , it gets excited and moves from lower energy level to higher energy level. the electron is less stable in higher energy level. when an electron returns from higher energy level to lower energy level it emits some energy in form of radiation. The wavelength of light depends upon energy level . and every elements have their own unique energy levels. The color for different element is different.
Thus, All the element have their own unique color because the every element have their own set of energy levels.
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Please help I need these answers
Answers
Answer:
false, true.
Explanation:
"That's because enzymes don't affect the free energy of the reactants or products" good luck!
why was the introduction of oxygen such a big deal?
Answers
ILL GIVE BRAINLIEST ⏳⏳⏳⏳⏳⌛◑﹏◐ Lorenzo is making a prediction. “I learned that nonmetals increase in reactivity when moving from left to right. So I predict that xenon will be more reactive than iodine.” Is Lorenzo correct? If so, why? If not, explain his error.
Answers
Answer:
Answer is no because,
Explanation:
Iodine is LESS REACTIVE than the elements above it in group 17 (fluorine, chlorine and bromine) it still forms compounds with many other elements. Although iodine is a non-metal, it displays some METALLIC properties. Xenon is one of the inert or noble gases and is odorless, colorless, tasteless and chemically NON REACTIVE
PLEASE MARK BRAINLIEST
19. A girl is ice skating and has 35 kgm/s of momentum. After she bumps into a
friend, she has 25 kgm/s of momentum. How much did she give her friend?
Answers
Answer:
15 kgm/s of momentum
Explanation:
Pls help, and fast plsssssssss
Answers
Answer:
The cell on the left is animal, The cell on the right is a plant cell.
Explanation:
1: cell membrane
2: chloroplast
3: cell wall
4: vacuole
5: mitochondria
6:nucleus
7: lysosome
8: cytoplasm
Things to remember, only plant cells have cell walls. Plant cells are the only ones that have chloroplast.
Like all metals, iron is malleable because of the type of bond between the atoms. Imagine trying to bend a straw. Is a straw a good model for showing the malleability of iron? Explain your answer.
Answers
Bending a straw is not a good model for showing the malleability of iron because it is not a metal.
What is malleability?Malleability is property by virtue of which a material can be extended in all directions without rupture by the application of load.
In simpler terms, malleability is a material's ability to be bent, formed, or shaped without cracking or breaking.
Malleability is a unique property of metals and according to this question, iron is malleable because of the type of bond between the atoms.
This suggests that bending a straw is not a good model for showing the malleability of iron because it is not a metal.
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Answer:
Explanation:
Bending a straw is not a good model for showing the malleability of iron because it is not a metal.
What is malleability?
Malleability is property by virtue of which a material can be extended in all directions without rupture by the application of load.
In simpler terms, malleability is a material's ability to be bent, formed, or shaped without cracking or breaking.
Malleability is a unique property of metals and according to this question, iron is malleable because of the type of bond between the atoms.
This suggests that bending a straw is not a good model for showing the malleability of iron because it is not a metal.
The irreversible isomerization A
B was carried out in a batch reactor and the following concentration time data were obtained:
Time vs Concentration data in a Batch reactor
t 0 3 5 8 10 12 15 7.5
mol/h 4 2.89 2.25 1.45 1.0 0.65 0.25 0.07
Determine the reaction order,
, and the specific reaction a rate constant, k, using any method of your choice.
Answers
The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.
The term "kinetics" refers to the study of reaction rates, which are determined by measuring the concentration of reactants and products as a function of time.Kinetics experiments can be used to determine the reaction rate and order of reaction. A chemical reaction's rate is defined as the change in the concentration of a reactant or product per unit time. The order of a reaction refers to the number of molecules that must react to produce a product. The order of reaction can be determined by measuring the initial rate of the reaction as a function of concentration.Methods for determining the reaction rate order include the initial rate method, the half-life method, and the integrated rate method. The initial rate method determines the reaction order by measuring the initial rate of the reaction at different reactant concentrations. The half-life method determines the reaction order by measuring the time it takes for the reactant concentration to decrease by half.The integrated rate method determines the reaction order by measuring the concentration of the reactant or product at different times.The specific rate constant can be determined by using the Arrhenius equation, which relates the rate constant to the activation energy, temperature, and frequency factor. The frequency factor can be determined by measuring the rate constant at different temperatures.For such more question on polymerization
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How is the A Hf related to the AH of a reaction?
A. The AHreaction is the sum of the A Hf, products and the A Hf,
reactants
B. The AHreaction is the same thing as the AHf, reactants
C. The AHreaction is the same thing as the AHf, products
OD. The A Hreaction is the difference between A Hf, products and A
reactants
[hm
Answers
The A Hreaction is the difference between A Hf, products and A
reactants. option D
What is the enthalpy of formation?Enthalpy of formation (also known as heat of formation) is the amount of heat released or absorbed when one mole of a compound is formed from its constituent elements in their standard states at a given temperature and pressure. The standard state for an element is its most stable form at a given temperature and pressure, typically 25°C and 1 atm.
Enthalpy of formation is an important parameter in thermochemistry and is used to determine the energy requirements for chemical reactions, such as combustion reactions or the synthesis of new compounds.
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What is the pH when the [H+] is 1 x 10^-3 M
A. 2
B. 3
C. -3
D. 4
Answers
Answer:
3
Explanation:
PH = -Log [H+]
PH = -Log [1 × 10^-3]
PH = -Log [10^-3]
Log (10) = 1
PH = -(-3) Log (10)
PH = 3 × 1
PH = 3
nitrogen from a mixture of nitrogen and oxgen
Answers
Answer:
Explanation:
The liquid nitrogen and oxygen are then separated by fractional distillation . The liquefied air is passed into the bottom of a fractionating column. Just as in the columns used to separate oil fractions , the column is warmer at the bottom than it is at the top.
Milk of magnesia, which is an aqueous suspension of magnesium hydroxide, is used as an antacid in the reaction below. How many molecules of HCl would have to be present to form 34.52 g of MgCl₂?
Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)
Answers
Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.
To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:
Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)
The molar mass of MgCl₂ is 95.21 g/mol.
First, we need to calculate the number of moles of MgCl₂ formed:
Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂
Moles of MgCl₂ = 34.52 g / 95.21 g/mol
Moles of MgCl₂ = 0.363 mol
According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:
Moles of HCl = 2 * Moles of MgCl₂
Moles of HCl = 2 * 0.363 mol
Moles of HCl = 0.726 mol
To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.
Number of molecules of HCl = Moles of HCl * Avogadro's number
Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol
Number of molecules of HCl = 4.37 x 10^23 molecules
Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.
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An antibiotic solution must be prepared by diluting 100. mL of a 90. % m/v solution and bringing up the volume to 250 mL. What is the concentration of the resulting solution?
Answers
Answer:
36% m/v
Explanation:
An antibiotic solution must be prepared by diluting 100. mL of a 90. % m/v solution and bringing up the volume to 250 mL. What is the concentration of the resulting solution?
the new solution is 100/250 X 90% m/v = 36% m/v
The concentration of the resulting antibiotics solution that must be prepared by diluting 100mL of a 90. % m/v solution and bringing up the volume to 250 mL is 36% m/v.
How to calculate concentration?The concentration of a solution can be calculated by using the following formula:
C1V1 = C2V2
Where;
C1 = initial concentrationC2 = final concentrationV1 = initial volumeV2 = final volume90% m/v × 100 = C2 × 250
9000 = 250C2
C2 = 36% m/v
Therefore, the concentration of the resulting antibiotics solution that must be prepared by diluting 100mL of a 90. % m/v solution and bringing up the volume to 250 mL is 36% m/v.
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What are the chemical symbols for the elements calcium, carbon, and chlorine respectively? es
A) CL, C, and Ce
B) C, Ca, and Co
C) Ca. C, and CL
D) Ca, Co, and CL
Answers
Answer:
C
Explanation:
heating curve iron
at what temperature does the substance begins to boil
at what temperature does a substance begin to melt
at what temperature is a substance for a liquid and a gas
at what temperature is the substance both a solid and a liquid
Answers
The substance begins to boil at 2750⁰C, the substance begins to melt at 1500⁰C, the temperature at which the substance is both a liquid and a gas at 2750⁰C, temperature is the substance both a solid and a liquid at 1500⁰C.
Heating curves are the graphical correlations between heat added to a substance. When viewed from a cooling perspective, ie. loss of heat, it is the cooling curve.
The gradient of the cooling curve is related to the heat capacity, the thermal conductivity of the substance, and the external temperature. The more heat is required to change the temperature of the substance, the slower it cools, so the smaller the gradient of the curve. The higher the thermal conductivity, the faster heat is transferred, so the faster the substance cools.
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