The laser that will eject electrons with a shorter de Broglie wavelength is the one with higher energy, which corresponds to the laser with a shorter wavelength.
According to the de Broglie wavelength equation, the wavelength of a particle (such as an electron) is inversely proportional to its momentum. Since momentum is related to the energy of the particle, higher energy particles will have shorter de Broglie wavelengths.
In the given scenario, the laser with a wavelength of 450 nm (blue light) has higher energy compared to the laser with a wavelength of 560 nm (yellow light). This is because blue light has a shorter wavelength and higher frequency than yellow light. Therefore, the electrons ejected by the blue light laser will have shorter de Broglie wavelengths.
The de Broglie wavelength is an important concept in quantum mechanics that describes the wave-like nature of particles. It relates the wavelength of a particle to its momentum and provides insight into the behavior of matter at the atomic and subatomic levels. In this case, the shorter de Broglie wavelength of the electrons ejected by the blue light laser indicates that these electrons have higher momentum and are associated with higher energy compared to the electrons ejected by the yellow light laser.
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A sample of neon gas initially at 20°C and 1.0 atm is expanded from 1.2L to 2.6L nad simulatneously heat to 40°C. Calculate ΔS for this change of state. (The neon can be treated as an ideal gas).
The change in entropy (ΔS) for the expansion and heating of neon gas is 0.514 J/K.
What is the entropy change?To calculate the change in entropy (ΔS) for the expansion and heating of neon gas, we can use the ideal gas equation and the formula for entropy change:
ΔS = nR ln(Vf/Vi) + nCv ln(T_f/Ti)
Where:
ΔS is the change in entropyn is the number of moles of gasR is the ideal gas constant (8.314 J/(mol·K))Vf and Vi are the final and initial volumes, respectivelyT_f and Ti are the final and initial temperatures, respectivelyCv is the molar heat capacity at constant volumeThe number of moles of neon gas (n) is calculated using the ideal gas equation:
n = PV / RT
Given:
P = 1.0 atm
Vf = 2.6 L
Vi = 1.2 L
T_f = 40°C = 40 + 273.15 K = 313.15 K
Ti = 20°C = 20 + 273.15 K = 293.15 K
R = 8.314 J/(mol·K)
n = (P × Vf) / (R × T_f)
n = (1.0 atm × 2.6 L) / (8.314 J/(mol·K) × 313.15 K)
n ≈ 0.1049 mol
The molar heat capacity at constant volume (Cv) for neon gas. The molar heat capacity of an ideal monatomic gas at constant volume is given as 3/2 R.
Cv = 3/2 R
Cv = (3/2) × 8.314 J/(mol·K)
Cv = 12.471 J/(mol·K)
Solving for entropy change:
ΔS = nR ln(Vf/Vi) + nCv ln(T_f/Ti)
ΔS = (0.1049 mol) × (8.314 J/(mol·K)) × ln(2.6 L / 1.2 L) + (0.1049 mol) × (12.471 J/(mol·K)) × ln(313.15 K / 293.15 K)
ΔS ≈ 0.219 J/K + 0.295 J/K
ΔS ≈ 0.514 J/K
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Thermal energy in the inner and outer core is heat that is from the original formation of Earth. Thermal energy is
transferred from the outer core towards the crust through the mantle. Which BEST describes how energy moves
through the mantle?
A
Thermal energy radiates from the outer core, through the mantle, to the crust.
B
Thermal energy moves by conduction from the outer core, through the mantle, and to the
crust by direct contact.
Thermal energy rises with heated magma from near the core and sinks back down as it cools
through convection.
D
Thermalbyergy heats up the magma by radiation and passes through the mantle as
conduction
Answer:it’s b they transfer thermal energy away from earths core towards its crust
Explanation:
Good luck!
Thermal energy moves from the outer core, through the mantle, and to the crust by conduction.
Heat transferred from the core through the mantle and to the crust in the process of conduction. The lower mantle is heated directly by conduction from the core. In conduction, heat is transferred from one particles to another.
In the process of conduction, heat flows from warmer objects to cooler objects so the outer core has high amount of heat energy which is transferred to the surrounding mantle layer due to its lower temperature so we can conclude that thermal energy moves from the outer core, through the mantle and to the crust by conduction.
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1. when enzyme a was run with 40 um substrate, the initial rate (vo) was 10 um/min, and when it was run with 4 mm substrate, the vo was 20 um/min. estimate the approximate vmax and km of enzyme a.
When enzyme a was run with 40 μM substrate, the initial rate ([tex]v_{0}[/tex]) was 10 μM/min, and when it was run with 4 mM substrate, the [tex]v_{0}[/tex] was 20 μM/min. The approximate ([tex]V_{max}[/tex] is 20 μM/min, and the approximate [tex]K_{m}[/tex] is 40.8 μM.
To estimate the approximate [tex]V_{max}[/tex] and [tex]K_{m}[/tex] of enzyme A, we can use the Michaelis-Menten equation, which describes the relationship between the initial reaction rate ([tex]v_{0}[/tex]), the maximum reaction rate ([tex]V_{max}[/tex] ), and the substrate concentration (S):
[tex]v_{0}[/tex] = ([tex]V_{max}[/tex] * S) / ([tex]K_{m}[/tex] + S)
For 40 μM substrate:
[tex]v_{0}[/tex] = 10 μM/min
S = 40 μM
For 4 mM substrate:
[tex]v_{0}[/tex] = 20 μM/min
S = 4 mM = 4000 μM
Using the Michaelis-Menten equation:
[tex]v_{0}[/tex] = ([tex]V_{max}[/tex]* S) / ([tex]K_{m}[/tex] + S)
Let's set up the equations using the given data points:
10 = ([tex]V_{max}[/tex] * 40) / ([tex]K_{m}[/tex] + 40)
20 = ([tex]V_{max}[/tex] * 4000) / ([tex]K_{m}[/tex] + 4000)
We can simplify these equations and solve them simultaneously:
Equation 1: 10([tex]K_{m}[/tex] + 40) = 40[tex]V_{max}[/tex]
Equation 2: 20([tex]K_{m}[/tex] + 4000) = 4000[tex]V_{max}[/tex]
Divide Equation 2 by Equation 1:
2([tex]K_{m}[/tex] + 4000) / ([tex]K_{m}[/tex] + 40) = 100
Expanding and simplifying:
2[tex]K_{m}[/tex] + 8000 = 100[tex]K_{m}[/tex] + 4000
98[tex]K_{m}[/tex] = 4000 - 8000
98[tex]K_{m}[/tex] = -4000
[tex]K_{m}[/tex] = -4000 / 98
[tex]K_{m}[/tex] ≈ 40.8 μM (Approximate [tex]K_{m}[/tex] value)
Substituting the value of [tex]K_{m}[/tex] into Equation 1:
10 = ([tex]V_{max}[/tex] * 40) / (40.8 + 40)
10 = ([tex]V_{max}[/tex] * 40) / 80.8
[tex]V_{max}[/tex] = (10 * 80.8) / 40
[tex]V_{max}[/tex] ≈ 20 μM/min (Approximate [tex]V_{max}[/tex] value)
Therefore, the approximate ([tex]V_{max}[/tex] is 20 μM/min, and the approximate [tex]K_{m}[/tex] is 40.8 μM.
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Determine the number of atoms of C in 30.2 grams of C₁₂H₂₂O₁₁.
Number of atoms of C in 30.2 grams of C₁₂H₂₂O₁₁ = 6.39 × 10²³ atoms
Given that mass of C₁₂H₂₂O₁₁ is 30.2 grams.
We are to find out the number of atoms of C in 30.2 grams of C₁₂H₂₂O₁₁.
In order to calculate the number of atoms of C in 30.2 grams of C₁₂H₂₂O₁₁, we need to follow the steps below:
Step 1: Calculate the molecular mass of C₁₂H₂₂O₁₁
Molecular mass of C₁₂H₂₂O₁₁ = (12 × 12.01) + (22 × 1.01) + (11 × 16) = 342.34 g/mol
Step 2: Determine the mass of carbon in C₁₂H₂₂O₁₁
The atomic mass of carbon is 12.01 g/mol.
Therefore, the mass of carbon in 1 mol of C₁₂H₂₂O₁₁ = (12 × 12.01) = 144.12 g/mol
Thus, the mass of carbon in 30.2 g of C₁₂H₂₂O₁₁= (30.2 × 144.12) / 342.34= 12.73 g
Step 3: Calculate the number of moles of carbon
Now, we know that the atomic mass of carbon is 12.01 g/mol.
Moles of carbon in 12.73 g = 12.73 / 12.01= 1.06
Step 4: Calculate the number of atoms of carbon1 mole of any element contains 6.022 × 10²³ atoms of that element.
So, the number of atoms of C in 1.06 moles= 1.06 × (6.022 × 10²³)= 6.39 × 10²³ atoms of C
Thus, there are 6.39 × 10²³ atoms of C in 30.2 grams of C₁₂H₂₂O₁₁.
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in general, how do single-displacement reactions compare with synthesis and decomposition reactions in terms of the amount of energy involved?
In general, single-displacement reactions are more reactive compared to synthesis and decomposition reactions. In terms of energy involved, single-displacement reactions require the least amount of energy to take place.
The energy that is involved in chemical reactions is the energy required to break the bonds of the reactants as well as the energy that is released when the new bonds form during the creation of the products. In synthesis and decomposition reactions, more energy is required compared to single-displacement reactions.
Synthesis reactions combine two or more reactants to form a single product. This process requires energy to break the bonds in the reactants and additional energy to create the bonds between the new atoms in the product. In contrast, decomposition reactions involve breaking down a single compound into two or more simpler products. This process requires energy to break the bonds within the compound, which is generally more energy than is required in a single-displacement reaction.
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The visible absorption spectrum for FD&C Blue 1 is shown in the following graph. The estimated concentration of the dye was 7.0 uM (7.0 x 106 M). 1. What would be an optimum wavelength for measuring the absorbance versus concentration of a series of Blue 1 dye concentrations? Explain your answer. Absorbance measurements are most accurate and FD&C sensitive in the range 0.2-1.0.
The optimum wavelength for measuring the absorbance versus concentration of a series of Blue 1 dye concentrations is 628nm. The absorbance measurements are most accurate and sensitive for FD&C in the range of 0.2-1.0. Hence the estimated concentration of the dye was 7.0 uM (7.0 x 106 M).
Visible absorption spectra provide information about a dye or a compound's electronic structure and can be used to determine the concentration of a compound. To determine the optimum wavelength for measuring the absorbance versus concentration of a series of Blue 1 dye concentrations, we can refer to the visible absorption spectrum for Blue 1 dye.
The graph provided in the question shows that the maximum absorbance for Blue 1 dye occurs at approximately 628 nm. This is also confirmed by the Beer-Lambert law, which states that the concentration of a solution is proportional to its absorbance. Therefore, the optimum wavelength for measuring the absorbance versus concentration of a series of Blue 1 dye concentrations is 628 nm.
The range of 0.2-1.0 is where the absorbance measurements are most accurate and FD&C sensitive. Therefore, the absorbance measurements for Blue 1 dye should be taken at this wavelength. Hence the estimated concentration of the dye was 7.0 uM (7.0 x 106 M).
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Please help with this chemistry question, please included step by step of how to do it. Thank you!
Answer:
The chemical equation for photosynthesis is:
6CO2 + 6H2O → C6H12O6 + 6O2
This equation shows that for every 6 moles of CO2 (carbon dioxide) and 6 moles of H2O (water) that are used in photosynthesis, one mole of C6H12O6 (glucose/sugar) and 6 moles of O2 (oxygen) are produced.
The molar mass of water (H2O) is 18.015 g/mol. Therefore, 100.5 g of water is equal to:
100.5 g / 18.015 g/mol ≈ 5.58 moles of water
Since the ratio of water to glucose in the equation is 6:1, we can calculate the number of moles of glucose produced as:
5.58 moles of water / 6 = 0.93 moles of glucose
The molar mass of glucose (C6H12O6) is 180.156 g/mol. Therefore, the mass of glucose produced is:
0.93 moles of glucose x 180.156 g/mol = 167.5 g of glucose
Therefore, if a plant absorbs 100.5 g of water, it will produce approximately 167.5 g of sugar through photosynthesis, assuming it has plenty of carbon dioxide available.
4 points
17. Some birds live in close association with horses. These birds feed on
insects that are parasites to horses. Which type of relationship between
the horses and these birds does this illustrate?
Commensalism
Mutualism
Parasitism
Predation
Answer:
The answer is mutualism
Which LIQUID is the most dense?
lamp oil
milk
water
honey
Answer:
Lamp oil
Explanation:
Hope this helps
Calculate the frequency of radiation with a wavelength of 4.92 cm.
Which of the following statements is true about the relationships between photon energy, wavelength, and frequency?
Group of answer choices
The photon frequency is proportional to energy and inversely proportional to wavelength.
The photon frequency is inversely proportional to energy and proportional to wavelength.
The photon frequency is proportional to energy and proportional to wavelength.
The photon frequency is inversely proportional to energy and inversely proportional to wavelength.
Answer: The Answer is A.
Explanation:
The amount of energy is directly proportional to the photon's electromagnetic frequency and thus, equivalently, is inversely proportional to the wavelength. The higher the photon's frequency, the higher its energy. Equivalently, the longer the photon's wavelength, the lower its energy.
Hope this Helps!
The photon energy, wavelength, and frequency are the characteristic of the waves and particles. "The photon frequency is proportional to energy and inversely proportional to wavelength." Thus, option A is correct.
What is photon energy?Photon energy has been defined as the energy constituted by the photon of the atom. It is given by the product of Planck's constant and wave frequency. The frequency of the photons is in inverse relation to the wavelength. It is given as,
E = hυ = h c / λ
Here, E is energy, h is Planck's constant, c is the speed of light, υ id frequency, and λ is the wavelength.
On the other hand, the frequency is in direct relation to the energy. The higher the frequency of the photons higher will be its energy.
Therefore, option A. frequency is inversely proportional to the wavelength.
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for an enclosed gas with a constant temperature, the pressure of the gas changes from 15 atm to 30 atm. what happens to the volume of the gas?(1 point)
In the given scenario, the pressure of the gas changes from 15 atm to 30 atm. Since the pressure increases, the volume of the gas will decrease.
According to Boyle's Law, for an enclosed gas at constant temperature, the pressure and volume of the gas are inversely proportional. This means that as the pressure of the gas increases, the volume of the gas decreases, and vice versa.
what is pressure?
Pressure is defined as the force applied per unit area. It is a measure of the amount of force exerted on a surface per unit area. Pressure is a scalar quantity and is typically measured in units such as pascals (Pa), atmospheres (atm), pounds per square inch (psi), or millimeters of mercury (mmHg).
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What happens to energy when Sally kicks a soccer ball?
Kinetic energy is transformed to chemical energy in muscles.
Potential energy is transformed to chemical energy in muscles.
Kinetic energy is transferred from the leg to the soccer ball.
Potential energy is transferred from the leg to the soccer ball.
Answer:
Kinetic energy is transferred from the leg to the ball
Explanation:
Before kicking the ball, you'll need to run to where the position of the ball is which implies that your leg is not at rest, immediately you kick the ball, you will be transferring the kinetic energy of your leg to the ball.
Kinetic energy is transferred from the leg to the soccer ball.
What is kinetic electricity?Kinetic energy is the strength of the movement, observable as the movement of an item, particle, or set of debris. Any item in movement is the usage of kinetic energy: someone taking walks, a thrown baseball, a crumb falling from a table, and a charged particle in an electric-powered field are all examples of kinetic electricity at work.
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why is the peridic table called 'the pedirotic table of elements" and not "the periodic table of compounds"?
a. it would not matter id thry called the pedioric table of compounds since the word element and compound mean the same thing.
b.because the pedioric table lists all known pure subtances in the universe
c. becasue the pedirotic tab;e was created before compounds wqhere understoog
Answer:
B
Explanation:
An object is moving with a velocity in the positive direction. If
the object exseriences an acceleration opposite the direction
of its motion it would be a acceleration,
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Answer:
Please elaborate. Maybe if you had actual answer choices
Explanation:
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How is energy related to the change of state represented
by the model?
O Atoms gain energy as a gas changes to a solid.
O Atoms gain energy as a gas changes to a liquid.
Atoms lose energy as a gas changes to a solid.
O Atoms lose energy as a gas changes to a liquid.
Answer:I’m not really sure but I think it might be D but please I’m sorry if I get it wrong
Explanation:
How do we know what stars are made of?
1. Add spectroscopy evidence and describe the technology of seeing spectral lines even that are NOT in the visible range of our eyes.
2. What hot gasses is our Sun made of? How do we know? Include the spectral lines from the sun and the individual gasses for a match
3. Choose another space body: a star or nebula in deep space, and identify its composition and what technology was used to view it.
These observational techniques and technologies enable astronomers to unravel the complex composition of stars and celestial objects, shedding light on the mysteries of the universe.
1. We know what stars are made of through the use of spectroscopy. Spectroscopy is a scientific technique that analyzes the interaction between light and matter. It allows us to study the unique fingerprint of light emitted or absorbed by different elements.
By using spectroscopy, scientists can examine the spectral lines, which are specific wavelengths of light that are either emitted or absorbed by different elements. These spectral lines provide crucial information about the chemical composition of stars and other celestial objects.
Spectroscopy extends beyond the visible range of our eyes. There are different types of spectroscopy, such as ultraviolet, infrared, and X-ray spectroscopy, which allow us to observe spectral lines that are not visible to us directly. These technologies use specialized detectors and instruments to detect and analyze these wavelengths of light, providing valuable insights into the composition of stars and other objects.
2. Our Sun is primarily composed of hot gases. Through spectroscopy, scientists have identified the specific elements present in the Sun's atmosphere. The prominent spectral lines observed in the Sun's spectrum correspond to elements such as hydrogen, helium, and trace amounts of other elements like oxygen, carbon, and iron.
The spectral lines from the Sun match with known spectral lines of these elements, confirming their presence in the Sun's composition. By studying the intensity and characteristics of these spectral lines, scientists can deduce the abundance and temperature of the different gases in the Sun.
3. Let's consider the Orion Nebula as an example of a deep space object. The composition of the Orion Nebula has been studied using a combination of technologies, including optical spectroscopy and infrared observations.
Optical spectroscopy helps to identify the presence of elements such as hydrogen, helium, oxygen, nitrogen, and other trace elements in the nebula. By analyzing the spectral lines emitted or absorbed by these elements, scientists can determine their abundance and temperature.
Infrared observations, on the other hand, allow scientists to probe the dust particles present in the nebula. By studying the infrared emission from the dust, scientists can gain insights into the chemical composition of the interstellar material and molecules present in the Orion Nebula.
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the rate of the reaction between no2 and co is independent of [co]. does this mean that co is a catalyst for the reaction?
No, the rate of the reaction between NO2 and CO being independent of [CO] does not necessarily mean that CO is a catalyst for the reaction.
The rate of a chemical reaction depends on the concentrations of the reactants and any catalysts involved. If the rate of the reaction is independent of the concentration of a particular reactant (in this case, CO), it suggests that the reaction is not affected by changes in the concentration of that reactant.
CO could potentially be a reactant that participates directly in the reaction rather than acting as a catalyst. In such cases, the reaction rate may be determined by other factors or steps in the reaction mechanism. The rate of the reaction between NO2 and CO being independent of [CO] could indicate that the rate-determining step of the reaction does not involve the CO concentration.
To determine if CO is a catalyst for the reaction, additional information about the reaction mechanism or the role of CO in the reaction would be needed. Catalysts typically undergo a different reaction pathway and are not consumed in the overall reaction, whereas reactants are consumed in the reaction.
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The volume of a beaker is 250 cm Three beakers can hold
mL water.
Help me pls.
Answer:750 mL
Explanation:
volume=3x250 cm^3 = 750 cm^3
750 cm^3 x 1mL/1cm^3 =750 mL
If the volume of a beaker is 250 cm. The amount of water that three beakers can hold is equal to 750 mL.
What is Volume?Volume may be defined as the amount of space that is significantly occupied by a three-dimensional figure or object. It is measured in cubic units.
According to the question,
The volume of a beaker is = 250 cm.
It is known that 1 milliliter is exactly the same as 1 cm.
∴ The amount of water three beakers can hold = 250 × 3 = 750 mL.
Therefore, if the volume of a beaker is 250 cm. The amount of water that three beakers can hold is equal to 750 mL.
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a sample of aluminum foil contains 7.00×1023 atoms. what is the mass of the foil?
The mass of the aluminum foil is approximately 26.98 grams. To calculate the mass of the aluminum foil, we multiply the number of atoms (7.00×10^23 atoms) by the molar mass of aluminum (26.98 g/mol).
Using Avogadro's number (6.022×10^23 atoms/mol), we find that the number of moles of aluminum in the sample is approximately 1.16 moles (7.00×10^23 atoms / 6.022×10^23 atoms/mol).
Finally, we can determine the mass by multiplying the number of moles by the molar mass: mass = number of moles × molar mass = 1.16 moles × 26.98 g/mol ≈ 31.3 grams.
Therefore, the mass of the aluminum foil is approximately 26.98 grams.
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Which statement is always true about a reversible chemical reaction?
A. The concentration of reactants is higher than that of the products.
B. The products can form reactants, and the reactants can form products.
C. The concentrations of reactants and products are not constant.
D. The concentration of the products is higher than that of the reactants.
Match the term with the definition. (4 points)
1.Solid
2.Liquid
3. Gas
4. Plasma
a. assumes the shape of the part of the container from the bottom up
b. charged particles that do not have a definite shape or volume
c. has a fixed volume and shape
d. takes the shape and volume of an entire container
Answer:
Liquid - A.
Solid - C.
Gas - D.
Plasma - B.
Explanation:
A liquid sinks to the bottom of a container, a solid is solid and has a fixed shape and density, a gas takes up an entire object (air for example), and plasma is left with B.
Hope this helps! Let me know.
which mineral property is the least useful for identifying minerals and why? which mineral property is the least useful for identifying minerals and why? density is the least useful property for identification because different specimens of the same type of mineral can vary in size. color is the least useful property for identification because it is the most obvious property. color is the least useful property for identification because the same mineral type can be found in several different colors as a result of impurities in the mineral. streak is the least useful property for identification because it does not work for minerals with metallic lusters. streak is the least useful property for identification because the same mineral type can be found with several different colors of streak caused by impurities in the mineral.
The least useful mineral property for identifying minerals is color. This is because the same mineral type can be found in several different colors as a result of impurities in the mineral. Color is not a reliable identifying feature for minerals, as it can vary considerably within a single mineral species.
Some minerals, such as quartz, can be found in a wide range of colors,, such as white, pink, purple, yellow, brown, and even black, making it difficult to use color alone to identify them. Mineral properties such as streak, hardness, cleavage, and luster provide more reliable information for mineral identification.
Density is also considered a less useful property for mineral identification because different specimens of the same type of mineral can vary in size, making it difficult to determine the density. Streak is also less useful for mineral identification because it does not work for minerals with metallic lusters, but it can be useful in identifying minerals that have non-metallic lusters.
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in terms of atomic structure explain why the first ionization energy of selenium is
a. Less than that of bromine (atomic number 35), and
b. Greater than that of tellurium (atomic number 52)
a. The first ionization energy of selenium is less than that of bromine because selenium has a larger atomic radius and a higher effective nuclear charge than bromine.
b. The first ionization energy of selenium is greater than that of tellurium because tellurium has a larger atomic radius and a higher shielding effect from inner electron shells compared to selenium.
a. The first ionization energy is the energy required to remove the outermost electron from an atom. In the case of selenium and bromine, the first ionization energy of selenium is less than that of bromine due to differences in atomic structure.
Selenium (atomic number 34) has a larger atomic radius than bromine (atomic number 35), meaning that the outermost electron in selenium is located farther from the nucleus. As a result, the attractive force between the outermost electron and the nucleus is weaker in selenium, making it easier to remove the electron and requiring less energy compared to bromine.
Additionally, selenium has a higher effective nuclear charge (the net positive charge experienced by the outermost electron) compared to bromine. The effective nuclear charge depends on the number of protons in the nucleus and the shielding effect of inner electron shells.
Despite having one less proton than bromine, selenium has a greater effective nuclear charge due to its smaller atomic size and less shielding from inner electron shells. This stronger attraction between the nucleus and the outermost electron in bromine requires more energy to remove the electron, resulting in a higher first ionization energy for bromine.
b. The first ionization energy of selenium is greater than that of tellurium (atomic number 52) because tellurium has a larger atomic radius and a higher shielding effect. Tellurium has more electron shells compared to selenium, resulting in a larger atomic size and greater shielding of the outermost electron from the nucleus.
The larger atomic size leads to a weaker attractive force between the nucleus and the outermost electron in tellurium, making it easier to remove the electron and requiring less energy compared to selenium. Therefore, selenium has a higher first ionization energy than tellurium.
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Ernest Rutherford's experiment led him to change the outlook on atom because
Answer:
What led him to change his outlook was because in his experiment, when he fired positively charged alpha particles at a piece of gold foil, he observed that some of the alpha particles were deflected to some degree, and some others bounced back directly toward him.
Explanation:
In his experiment, he fired positively charged alpha particles at a piece of gold foil.
Now, after doing that he observed that some of the alpha particles were deflected to some degree, and some others bounced back directly toward him.
After those observations, he felt that for the order of the alpha particles to have been deflected, they would possibly have been hit or come close to being hit by a positively charged particle in the atom. This made him to conclude that an atom consists mostly of empty space, with a very small and dense but positively charged nucleus at the center. And that this nucleus contains most of the mass of the atom, while the electrons orbit the nucleus.
014
Question 5
(02.02 MC)
Which of the following is the best example of chemical weathering? (4 points)
a. Limestone rocks dissolving in water
b. Plant roots growing through concrete and splitting it
c. Waves carrying sand away from a beach
d. A large rock splitting into pieces because of ice
Answer:
my guess would be limestone disolving in water
Explanation:
Answer:
It is Limestone rocks dissolving in water
Explanation:
I did same exact quiz and I got it correct
A box contains equal amounts of helium, argon, and krypton at 25°C. Describe the masses, average velocities, and average kinetic energy of the three kinds of gas in the mixture. What do they have in common? What are the differences?
In the given mixture, the masses, average velocities, and average kinetic energies of helium, argon, and krypton will differ based on their individual atomic masses and properties.
1. Masses:
The atomic masses of helium, argon, and krypton are different. Helium has the lightest atomic mass (4 atomic mass units), followed by argon (40 atomic mass units), and krypton (84 atomic mass units). Therefore, helium will have the lowest mass, while krypton will have the highest mass.
2. Average Velocities:
The average velocities of the gases are related to their temperatures. At the same temperature, lighter gases tend to have higher average velocities compared to heavier gases. Since the gases are at the same temperature, helium will have the highest average velocity, followed by argon, and then krypton.
3. Average Kinetic Energy:
The average kinetic energy of a gas is directly proportional to its temperature. Since the gases are at the same temperature, they will have the same average kinetic energy. However, individual gas molecules within the mixture will have different kinetic energies based on their masses and velocities.
In terms of what they have in common:
- All three gases are at the same temperature.
- They are all gases at the given conditions.
- They all exhibit random motion and possess kinetic energy.
The differences between them are:
- Masses: Helium has the lightest atomic mass, followed by argon and then krypton.
- Average velocities: Helium has the highest average velocity, followed by argon and then krypton.
- Individual kinetic energies: The individual gas molecules within the mixture will have different kinetic energies based on their masses and velocities.
Overall, the differences arise from the varying atomic masses and properties of helium, argon, and krypton, which affect their motion, speed, and energy within the gas mixture.
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The particle(s) found inside the nucleus are called:
you and a coworker have developed a molecule that has shown potential as cobra antivenin . this antivenin works by binding to the venom , thereby rendering it nontoxic. this reaction can be described by the rate law: you have been given the following data from your coworker: a plot of versus gives a straight line with a slope of . what is the value of the rate constant for this reaction? rate constant
In order to calculate the value of the rate constant for this reaction, we need to consider the given information, which is:A plot of versus gives a straight line with a slope of
This information allows us to find the order of the reaction, which is 1, because the slope of a plot of concentration versus time is equal to the order of the reaction. After finding the order of the reaction, we can write the rate law for the reaction as follows: rate = k [A]¹ Where A represents the concentration of the reactant (venom) and 1 represents the order of the reaction. Since we have already found that the order of the reaction is 1, we can substitute this value into the rate law to get:
rate = k [A]
Now we have all the information we need to solve for the rate constant k, which is what the question is asking for. We are given data from the coworker, but there is no information provided about the actual values of concentration and rate for the reaction. Therefore, we cannot calculate the exact value of the rate constant. We can only determine the units of the rate constant, which would be M1s1, based on the order of the reaction being 1.
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What is the coefficient for water molecules in the balanced version of the following redox reaction? cr2o2−7 c2h4o→c2h4o2 cr3
The given redox reaction is:
Cr2O7^2- + C2H4O → C2H4O2 + Cr3+
To balance this reaction, we first balance the oxygen atoms by adding H2O on the right side of the equation. The number of H2O molecules added depends on the number of oxygen atoms needed. In this case, we need three O atoms on the right side, so we add three H2O molecules to the right side of the equation:
Cr2O7^2- + C2H4O → C2H4O2 + Cr3+ + 3H2O
Next, we balance the hydrogen atoms by adding H+ ions on the left side of the equation. The number of H+ ions added depends on the number of hydrogen atoms needed. In this case, we need eight H atoms on the left side, so we add eight H+ ions to the left side of the equation:
Cr2O7^2- + C2H4O + 8H+ → C2H4O2 + Cr3+ + 3H2O
Finally, we balance the charge by adding electrons. The number of electrons added depends on the difference in charge on the left and right side of the equation. In this case, the left side has a charge of -2 (from the Cr2O7^2- ion), while the right side has a charge of +3 (from the Cr3+ ion). This means that we need to add 5 electrons to the left side of the equation to balance the charge:
Cr2O7^2- + C2H4O + 8H+ + 5e- → C2H4O2 + Cr3+ + 3H2O
Therefore, the coefficient for water molecules in the balanced version of the given redox reaction is 3.
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