The following values are the only energy levels of a hypothetical one-electron atom:
E₆ = -2×10⁻¹⁹J E₅ = -7×10⁻¹⁹J
E₄ = -11 ×10⁻¹⁹J E₃ = -15 ×10⁻¹⁹J
E₂ = -17 ×10⁻¹⁹J E₁ = -20×10⁻¹⁹J
(b) What is the ionization energy (in kJ/mol) of the atom in its ground state?
Answers
The ionization energy of the atom in its ground state is -900 kJ/mol.
What is ionization energy?Ionization energy, is the minimal amount of energy needed to liberate the most loosely bound electron from an isolated gaseous atom, positive ion, or molecule in physics and chemistry.
Calculation of ionization energy in ground state:= -15 ×10⁻¹⁹J/electron
= -15 ×10⁻¹⁹ x 6.02 x \(10^{23}\) J/mol
= -90 x \(10^{4}\)
= -900 kJ/mol
Hence, the ionization energy of the atom in its ground state is -900 kJ/mol.
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Related Questions
An atom of which element has the greatest attraction for the electrons in a bond with a hydrogen atom
Answers
Answer: Fluorine
Explanation: There are many variables that can affect the strenght of attraction of the electrons in a chemical bond.
The most significant of them is the electronegativity: a meassure of the affinity an element has with the electrons . The higher the electronegativity, the stronger the attraction with electrons.
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What is the pH of a solution with a [H3O+] concentration of 3.4 x 10-¹¹ M?
Answers
The pH of the solution will be 10.47.
what is pH?The pH of a solution is mathematically given as:
pH = - log [\(H^+\)] of -log [\(H_3O^+\)]
Thus, in this case, with [\(H_3O^+\)] of 3.4 x 10-¹¹ M:
pH = -log 3.4 x \(10^-^1^1\) = 10.47
Thus, the pH of the solution will be 10.47.
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which of the following best describes the purpose of standardization? the purpose is... group of answer choices to precisely and accurately determine the concentration of a solution. to precisely and accurately determine the volume of a solution. to calibrate the ph sensor using solutions of precisely known hydronium concentration. to calibrate volume markings on a buret. to precisely and accurately determine the acidity constant for an acidic analyte. g
Answers
The purpose of standardization is to calibrate volume markings on a buret known reference value or concentration for a substance or instrument.
The process of standardization involves comparing the unknown value or concentration of a substance or instrument with a known standard value or concentration.
This process is critical in many scientific fields, including chemistry, biology, and engineering, as it ensures that measurements and analyses are accurate and reliable.
Standardization can also help to ensure consistency and comparability between different laboratories, instruments, or experiments.
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draw a stereoisomer of trans-1-chloro-4-methylcyclohexane.
Answers
The diagram for stereoisomer of trans-1-chloro-4-methylcyclohexane is given in the image. Stereoisomers are molecules that have the same molecular formula and connectivity of atoms but differ in their spatial arrangement.
Cyclohexane is a six-membered carbon ring, and in the case of cis-1-chloro-4-methylcyclohexane, it contains a chlorine atom (Cl) and a methyl group (CH3) as substituents. The stereoisomerism in cyclohexane compounds arises due to the restricted rotation around the carbon-carbon (C-C) single bonds in the ring.
In trans-1-chloro-4-methylcyclohexane, the chlorine and the methyl group are located on opposite sides of the ring. This is known as the trans configuration. On the other hand, in cis-1-chloro-4-methylcyclohexane, the chlorine and the methyl group are located on the same side of the ring. This is known as the cis configuration.
The cis-1-chloro-4-methylcyclohexane molecule can be represented in a chair conformation, which is a common way to depict the spatial arrangement of cyclohexane derivatives. In the chair conformation, the cyclohexane ring adopts a three-dimensional shape resembling a chair, with alternating axial and equatorial positions for the substituents.
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3. Which of the following items is representative of a homogeneous
mixture?
2 points
A. spaghetti & meatballs
B. cheeseburger
C. white bread dough
D. smoothie
E. Both A and B
O F. Both C and D
4. Which of the following is a chemical property of matter?
Answers
Answer: F. both c and d
Explanation:
homogeneous mixture is of same kind/phase. so the most appropriate answer we can take is smoothie and white bread dough :)
Explanation: the answer is F because a homogenous mixture can’t be taken apart or separated which in that case once bread dough is formed you can no longer take out the flour and other ingredients and same with the smoothies you’ve blended the fruit together you can’t send it to its original state
The number of valence electrons in Group 2 elements is
A.0
B.1
C.3
D.2.
Answers
Answer:
2
Explanation:
Elements in Group 2 have 2 valence electrons.
The number of valence electrons in Group 2 elements is 2. The correct answer is option D.
Valence electrons are the electrons present in the outermost energy level of an atom, and they play a critical role in determining the chemical properties of an element.
Group 2 elements are also known as alkaline earth metals, and include beryllium, magnesium, calcium, strontium, barium, and radium. These elements have two valence electrons in their outermost energy level, which makes them highly reactive and likely to form cations with a charge of +2.
Therefore, option D. 2 is the number of valence electrons in Group 2 elements.
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At 0°C, KMnO4 is much less soluble than at room temperature. If you had a saturated solution of KMnO4 at 0°C, with solid KMnO4 precipitate present at the bottom of the solution, what would you expect to happen to the color of the KMnO4 solution as it was heated?
Answers
The dissolved KMnO₄ would increase the intensity of the color of the solution, making it darker.
As KMnO₄ is more soluble at room temperature than at 0°C, heating the solution would increase the solubility of KMnO₄, leading to more KMnO₄ dissolving in the solution. The dissolved KMnO₄ would increase the intensity of the color of the solution, making it darker.
Therefore, as the KMnO₄ solution is heated, we would expect to see an increase in the intensity of the color of the solution as more KMnO₄ dissolves, and the solid KMnO₄ precipitate present at the bottom of the solution would gradually dissolve.
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About 200 years later Arrhenius proposed that water can dissolve many compounds
Answers
Arrhenius is postulated in 200 years after that fluids can dissolve many compounds by dividing them into their constituent ions. He argued that acids contain helium and that when they dissolve in water, they release hydrogen.
What is the Arrhenius theory of bases that gives when dispersed in water?Pursuant to the Arrhenius the hypothesis, acidic is a component that produces hydrogen ion in freshwater. With fluid, basic elements emit the ion hydroxide. According to the Bronsted-Lowry theory, an acid is a proton giver while a base is a recipient of protons.
Are an Arrhenius base one that dissolves with water to form OH?Bases are chemicals that, while dispersed into water, establish hydroxide ions (OH-). Bases and acids. Any material that ionises when dissolved in liquid to give a charge called H+ and hydrogen called an Arrhenius acid. When submerged in fluid, an Arrhenius foundation is a material the fact that releases the OH-, or hydroxide, the ion.
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The reaction R to an injection of a drug is related to the dosage x (in milligrams) according to R(x)=x ^
2(660− x/3) where 1320mg is the maximum dosage. If the rate of reaction with respect to the dosage defines the sensitivity to the drug, find the sensitivity. R '
(x)=
Answers
The sensitivity of the drug can be determined by finding the derivative of the reaction function with respect to the dosage.
What is the derivative of the reaction function?To find the sensitivity of the drug, we need to calculate the derivative of the reaction function R(x) with respect to x.
Taking the derivative of the given function R(x) = \(x^2(660 - x/3)\) involves applying the product rule and chain rule.
Differentiating R(x) with respect to x yields:
R'(x) = \(2x(660 - x/3) - x^2/3\)
Simplifying further:
R'(x) = \((1320x - x^2) / 3\)
This expression represents the rate of reaction with respect to the dosage, which indicates the sensitivity of the drug.
By evaluating R'(x) at different dosage values, we can determine how the rate of reaction changes with the dosage and infer the drug's sensitivity.
The sensitivity of a drug refers to how the rate of reaction, or response, changes in relation to the dosage administered.
In this case, the sensitivity can be quantified by calculating the derivative of the reaction function R(x) with respect to the dosage x.
By taking the derivative, we obtain R'(x), which represents the rate of change of the reaction with respect to the dosage.
Evaluating R'(x) at different dosage values allows us to determine the drug's sensitivity to dosage variations.
A higher magnitude of R'(x) indicates a greater sensitivity, as the rate of reaction changes more rapidly with dosage adjustments.
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does an oxygen atom form two covalent bonds?
Answers
Answer:
yes
Explanation:
Two covalent bonds form between the two oxygen atoms because oxygen requires two shared electrons to fill its outermost shell.
what is the mass number of silver
Answers
Silver (Atomic Mass) :- 107.8682 u
Answer:
Atomic Number: 47
Atomic Mass: 107.8682 u
what term should be used to describe the presence of a higher concentration of a salt within a fluid than the volume is able to dissolve to maintain equilibrium?
Answers
In fact, sodium, potassium, or ammonium sulfates enhance ligand-protein interactions in HIC while also stabilizing protein structure. As a result, the most prevalent ions are (NH4)2SO4, Na2SO4, NaCl, KCl, and CH3COONH4. Figure 1 depicts how various salts can influence selectivity. The highest resolution of four standard proteins was achieved by starting with 1.7 M ammonium sulfate.
Because each salt has a different capacity to encourage hydrophobic interactions, selecting a salt for an HIC separation can be a trial and error process. When the concentration of a salt rises, the quantity of protein bound increases almost linearly up to a certain salt concentration and then exponentially at greater concentrations.When compared to other salts, ammonium sulfate often provides the greatest clarity at a particular concentration and can be used at ratios up to 2 M.
When using sodium chloride, concentrations of up to 3 M are typically needed.
Although sodium sulfate is an excellent salting-out substance, issues with protein solubility may preclude its use at high amounts.
Working with ammonium sulfate at pH levels above 8.0 is not advised.
how do we compare the PH of a weak acid and a strong acid of identical concentration and draw a conclusion about the concentration of hydrogen ions?
Answers
Answer:
This means that the pH values of strong acids are lower than that of weak acids, which explains why the rate of reaction of strong acids with substances (such as metals, metal carbonates etc) is higher than that of weak acids.
Explanation:
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Question 7 of 25
Why are many scientists dependent on the government for funding?
OA. The government is in control of all public research.
OB. Research is often too expensive to do without the government's
help.
C. Scientists have no other source of money.
OD. Scientists can do only the research the government will pay for.
Answers
Many scientists are dependent on the government for funding for many reasons. One of the main reasons is that research is often too expensive to carry out without the help of the government. Option b)
The government plays a major role in scientific research, especially in areas of national interest. Government research funding plays an important role in promoting scientific inquiry and advancing knowledge of the natural world. The government is in charge of allocating research funds to public and private organizations. For scientists who want to carry out their research, it can be challenging to find funding from other sources, such as private companies.
As a result, the majority of researchers rely on government grants to finance their work. This dependence on government funding has advantages and disadvantages . One of the advantages is that it ensures that scientific research is carried out in areas that are of national interest. By prioritizing funding for specific areas, the government can direct research toward those issues that are considered important to the country. Another advantage is that it can lead to more innovation. Government grants often provide funding for research that might not be carried out otherwise, such as new technologies or techniques. This can result in breakthroughs that lead to new products, services, or ideas.However, there are also some disadvantages to being dependent on government funding. One of the main drawbacks is that it can lead to a lack of independence. Researchers who rely on government grants may feel obligated to focus on areas that the government deems important, rather than pursuing their own interests or those that are considered unconventional. Another disadvantage is that government funding can be unpredictable. Grants are usually awarded for a limited period of time and may be subject to budget cuts or changes in priorities. As a result, scientists may have to constantly seek new sources of funding or may be forced to abandon their research projects. Hence option b) is correct.
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if an object contains more electrons than protons, it is said to be
Answers
If an object contains more electrons than protons, it is said to be negatively charged. This is because electrons are negatively charged particles while protons are positively charged particles. The excess electrons in the object will give it an overall negative charge.
This negative charge can be observed in various ways. For example, if the object is brought close to a positively charged object, it will be attracted to it. This is because opposite charges attract each other. On the other hand, if the object is brought close to another negatively charged object, it will repel it. This is because like charges repel each other.
Negatively charged objects can also have an impact on their surroundings. For example, they can create static electricity, which can lead to shocks when two objects with different charges come into contact. They can also affect electronic equipment, as excess electrons can cause interference and damage.
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Convert 550 Hm to mm
Answers
Answer:
55,000,000
Explanation:
550 hectometers [hm] = 55,000,000 millimeters [mm]
How would you define speed and the formula to find speed?
Answers
Answer:
Speed is how fast you cover a certain distance
\(Speed=\frac{Distance}{time}\)
A cube has a mass of 42 grams and a volume of 15 cubic centimeters. What is it’s density?
(Show your work or complete all problems for brainliest)
Answers
Answer:
2.8g/cm³
Explanation:
Given parameters:
Mass of cube = 42g
Volume of cube = 15cm³
Unknown:
Density of the cube = ?
Solution:
Density is defined as the mass per unit volume of a substance. It is mathematically expressed as:
Density = \(\frac{mass}{volume}\)
So;
Density = \(\frac{42}{15}\) = 2.8g/cm³
Less than (%) can name the Supreme court Judge?*
Your answer
Answers
Answer:
36%
Explanation:
Which element below would have a 3+ charge as an ion?
Answers
Answer:
Al3+
Explanation:
Aluminium has an electronic configuration of 2, 8, 3 and the outermost valence electrons is +3 since it is a metal
Elements acquire positive or negative charges by losing or gaining electrons. The element which have 3+ charge among the options is boron (B) Hence, option B is correct.
What is boron?Boron is 5th element in periodic table and it is classified into 13th group. Boron is a metalloid and shows properties intermediate to metals and non metals.
The electronic configuration of boron is K =2, N =3. Atoms lose or gain electrons as per their valency to become stable. According to octet rule atoms become stable when their valence shell get completely filled.
Boron have 3 electrons in its valence shell. If it donate these three electrons into an electronegative atom, its K shell become its valence shell and it is completely filled. Thus boron becomes stable.]
When atoms loses electrons they acquire positive charge and this charge is numerically equal to the number of electrons lost. Thus boron acquire 3 unit of positive charge by donating its 3 electrons. Hence, option B is correct.
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Your question is incomplete. But your complete question probably was :
Which element below would have a 3+ charge as an ion?
answer choices.
nitrogen (N).
boron (B).
silicon (Si).
argon (Ar)
. Which of these types of electromagnetic radiation has the lowest energy?
a. Radio waves
b. Visible light
c. Gamma rays
Answers
Radio waves are the lowest-energy electromagnetic waves. They also have the longest wavelengths and the lowest frequencies. Hope this helps!
Calcium is element 20 in the Periodic Table, has a mass of 40 amu and forms a 2+ ionic species. The calcium ion therefore has a. 18 protons, 18 neutrons and 22 electrons b. 22 protons, 18 neutrons and 18 electrons c. 20 protons, 20 neutrons and 18 electrons d. 18 protons, 20 neutrons and 20 electrons e. 20 protons, 18 neutrons and 20 electrons 1. In the following expression a∼1/b, what is the relationship between the components a and b ? a. Direct proportion b. None of the above c. Exact equation d. Inverse proportion e. Proportionality constant
Answers
The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.
The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.
The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.
The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.
So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons
In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion
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when the mass of cells does not completely split apart the result is:____
Answers
conjoined twins
during the embryo period the embryo becomes vlunerable to diseases the mother may have .
Convert 380 K to degrees F.
Answers
Answer:
224.33
Explanation:
Answer:
224.33
Explanation:
what is the mass-volume percentage of a solution of 1.50g of solute dissolved in water to make 50.0ml of solution?
Answers
The mass-volume percentage of the solution is 3%.
Mass-volume percentage is the amount of solute (in grams) dissolved in 100 mL of the solution.
Given, the mass of solute = 1.50 g
Volume of solution = 50.0 mL
To calculate the mass-volume percentage, we need to convert the volume to 100 mL.
Mass-volume percentage = (mass of solute/volume of solution) x 100
= (1.50 g/50.0 mL) x 100
= 3%
Therefore, the mass-volume percentage of the solution is 3%.
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A diver's tank contains helium at 924 psi,
nitrogen at 1456 psi and oxygen. The total
pressure is 2803 psi. What partial pressure is
exerted by the oxygen?
Answers
Hope this helps and GOOD LUCKKK :)))
DNA and RNA are structurally similar in some ways, but different in others. Identify whether each of the following statements applies to DNA, RNA, both or neither.
Select answer
1. It can contain the purine guanine. Select answer
2. It can contain the pyrimidine uracil.
3. This contains the sugar 2'-deoxyribose. Select answer
4. In terms of base composition, the %T %G. Select answer
5. This contains the sugar ribose. Select answer
6. The bases are attached to sugar in a β-N glycosidic linkage. Select answer.
7. It contains equal amounts of purines and pyrimidines. Select answer la 8. Sugars are connected with a 3-5' phosphodiether link. Select answer
Answers
When identifying whether each of the following statements applies to DNA, RNA, both or neither, the answers are as follows:
1. It can contain the purine guanine: Both DNA and RNA can contain the purine guanine.
2. It can contain the pyrimidine uracil: RNA can contain the pyrimidine uracil, but DNA cannot.
3. This contains the sugar 2'-deoxyribose: DNA contains the sugar 2'-deoxyribose, but RNA contains ribose.
4. In terms of base composition, the %T %G: This statement applies to DNA.
5. This contains the sugar ribose: RNA contains the sugar ribose, but DNA contains 2'-deoxyribose.
6. The bases are attached to sugar in a β-N glycosidic linkage: Both DNA and RNA have bases that are attached to sugar in a β-N glycosidic linkage.
7. It contains equal amounts of purines and pyrimidines: Neither DNA nor RNA contains equal amounts of purines and pyrimidines.
8. Sugars are connected with a 3-5' phosphodiester link: Both DNA and RNA have sugars that are connected with a 3-5' phosphodiester link.
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If a concentrated solution of acetic acid is 99.5 % HC 2 H 3 O 2 and has a density of 1.05 g/mL, what is the concentration of this acid in moles per litre?
Answers
The concentration of this acid in moles per litre : 17.41
Further explanationGiven
99.5% acetic acid
density=ρ=1.05 g/ml
Required
the concentration (mol/L)
Solution
99.5% dan density 1.05 g/ml (MW acetic acid = 60 g/mol)
\(\tt 99.5\%\times 1.05\dfrac{g}{ml}\times \dfrac{1000~ml}{L}=1044.75~g/L\\\\\dfrac{1044.75~g/L}{60~g/mol}=17.41~mol/L\)
An atom of nitrogen would be stable if it bonded with how many atoms of chlorine?
Answers
Which sequence of words is in order of being able to carry the MOST electric
current to the LEAST? *
Resistor, insulator, conductor
Insulator, conductor, resistor
Conductor, insulator, resistor
Conductor, resistor, insulator
Answers
Answer: The order of being able to carry the MOST electric
current to the LEAST is Conductor, resistor, insulator
Explanation:
Resistor is a device which partially prevents the flow of electric current through it.
Insulator is a device which completely prevents the flow of electric current through it.
Conductor is a device which allows the flow of electric current through it.
Thus the sequence of words in order of being able to carry the MOST electric
current to the LEAST is Conductor , Resistor , Insulator.