what is the formula of boron nitride?

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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Answer:

True

Explanation:

Answer:

True

Explanation:

the answer is true because Google said it and if Google said it its true

the molarity of the acetic acid solution is 0.1571 M.

To determine the molarity of the acetic acid (HC2H3O2) solution, we can use the concept of stoichiometry and the volume and concentration data provided.

Given:

Volume of KOH solution = 15.5 ml

Molarity of KOH solution = 0.215 M

Volume of acetic acid solution = 21.2 ml

In a balanced chemical equation between KOH and acetic acid, the stoichiometric ratio is 1:1. This means that 1 mole of KOH reacts with 1 mole of acetic acid.

Using the equation:

KOH(aq) + HC2H3O2(aq) -> H2O(l) + KC2H3O2(aq)

The moles of KOH can be calculated using the formula:

Moles = Volume (in liters) x Molarity

Moles of KOH = (15.5 ml / 1000) L x 0.215 M

            = 0.0033325 moles

Since the stoichiometric ratio is 1:1, the moles of acetic acid are also 0.0033325 moles.

The molarity of acetic acid can be calculated using the formula:

Molarity = Moles / Volume (in liters)

Molarity of acetic acid = 0.0033325 moles / (21.2 ml / 1000) L

                      = 0.1571 M

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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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Answer:

Explanation:

minerals or ores

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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Answer:

Iodine is a mineral found in some foods. The body must have iodine to make thyroid hormones. The hormones control the body's metabolism and many other important functions. Without iodine, thyroid hormone production can decrease.

Explanation:

The two particles found in the nucleus of an atom are protons and neutrons. Protons carry a positive charge, while neutrons are neutral. Electrons, though essential to atoms, are located outside the nucleus in electron shells or orbitals. Option 3.

The two particles found in the nucleus of an atom are protons and neutrons. The nucleus is the central part of an atom that contains most of its mass and is positively charged. Protons are positively charged subatomic particles that carry a charge of +1.

They are crucial in determining the atomic number and identity of an element. Neutrons, on the other hand, are electrically neutral subatomic particles that do not carry a charge. They have a mass similar to protons and play a role in stabilizing the nucleus through the strong nuclear force.

Electrons, which are negatively charged subatomic particles, are not found in the nucleus. Instead, they occupy regions called electron shells or orbitals surrounding the nucleus. Electrons have a negligible mass compared to protons and neutrons.

Atoms, as a whole, consist of a positively charged nucleus surrounded by these negatively charged electrons. The number of protons in the nucleus determines the atomic number of an element, while the combined number of protons and neutrons determines its mass number. Option 3 is correct.

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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.

The mass percent of oxygen in the compound is 16.6%. The correct option is [A] 16.6%

From the question,

We are to determine the mass percent of oxygen in the compound

The mass percent of oxygen in the compound can be calculated from

[tex]Mass\ percent\ of\ oxygen = \frac{Mass\ of\ oxygen\ in\ the\ compound}{Mass\ of\ the\ compound } \times 100\%[/tex]

First, we will determine the mass of oxygen in the compound

Mass of oxygen in the compound = Mass of the compound - Mass of the metal before it combined with oxygen

From the question

Mass of the compound = 3.01 g

Mass of the metal before it combined with oxygen = 2.51 g

∴ Mass of oxygen in the compound = 3.01g - 2.51g

Mass of oxygen in the compound = 0.5 g

Now,

For the mass percent of oxygen in the compound

[tex]Mass\ percent\ of\ oxygen = \frac{Mass\ of\ oxygen\ in\ the\ compound}{Mass\ of\ the\ compound } \times 100\%[/tex]

∴ [tex]Mass\ percent\ of\ oxygen = \frac{0.5}{3.01} \times 100\%[/tex]

[tex]Mass\ percent\ of\ oxygen = \frac{50}{3.01} \%[/tex]

Mass percent of oxygen = 16.611%

Mass percent of oxygen ≅ 16.6%

Hence, the mass percent of oxygen in the compound is 16.6%. The correct option is [A] 16.6%

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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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Answer:

gas given off

Explanation:

that's the answer

Answer:

10

Explanation:

The balanced equation shows that you produce one Al molecule using 3Na molecules.  If you increase the amount of Na to 30 molecules, you are taking the original amount of Na and multiplying by 10.  The equation would have to be re-balanced as shown below.  Therefore you'd multiply the amount of Al on the right side by 10 also.

30Na + 10AlCl3 => 30NaCl + 10Al

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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Answer: because the particles in a solid are more closer to each other than the liquid and gas particles. So the closeness if the particles give a particular shape for the substance.

Please add me to the brainleist please!!!!!!!!

To solve this problem, we need to use the concept of elementary charge and Avogadro's number.

(a) To find the number of excess electrons on the sphere, we need to determine the net charge of the sphere.

Given:

Atomic number of lead (Z) = 82

Atomic mass of lead (M) = unknown

To calculate the mass of the lead sphere, we need to know the atomic mass of lead. However, it is not provided in the question. Could you please provide the atomic mass of lead?

(b) Once we have the atomic mass of lead, we can calculate the number of excess electrons per lead atom using the equation:

Number of excess electrons per lead atom = (Net charge of the sphere) / (Charge of one electron)

The charge of one electron is equal to the elementary charge (e), which is approximately 1.602 × 10^(-19) coulombs.

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The change in entropy (ΔS) for the expansion and heating of neon gas is 0.514 J/K.

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:

The  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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Answer:

Explanation:

206 kl.

Answer:

B

Explanation:

The wavelength of an electron moving at 3.66 x 10^6 m/s can be calculated as approximately 1.47 x 10^(-10) meters.

To calculate the wavelength of an electron, we can use the de Broglie wavelength equation:

Wavelength = h / (mass x velocity)

where h is the Planck's constant.

Given the mass of the electron (m = 9.11 x 10^(-28) g) and its velocity (v = 3.66 x 10^6 m/s), we can convert the mass to kilograms (1 g = 10^(-3) kg) and use the values in the equation.

Plugging in the values:

Wavelength = (6.626 x 10^(-34) J·s) / ((9.11 x 10^(-31) kg) x (3.66 x 10^6 m/s))

Performing the calculation yields a wavelength of approximately 1.47 x 10^(-10) meters.

Therefore, the wavelength of the electron is approximately 1.47 x 10^(-10) meters.

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A bottle is filled with a small amount of a volatile liquid and sealed. Sometime later, it is observed that no liquid is evident in the sealed bottle. The following statement would explain this observation: "Liquid and vapor are at equilibrium in the bottle."

This observation could be explained by stating that liquid and vapor are at equilibrium in the bottle. It means that there is a dynamic equilibrium between the liquid and vapor phases of the substance in the closed system. When the amount of vapor in the bottle is equal to the amount of liquid that has evaporated from the bottle, the system reaches an equilibrium state.

Therefore, the vapor state is favored when equilibrium is established. The liquid has not undergone sublimation. Also, more time is not needed to establish equilibrium. Furthermore, too little liquid was not added to achieve liquid-vapor equilibrium in the closed system. Hence, the statement "Liquid and vapor are at equilibrium in the bottle" explains the observation that no liquid is evident in the sealed bottle.

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Answer:

The answer is HCl → H 2 O H+ + Cl.

Answer:

Please elaborate. Maybe if you had actual answer choices

Explanation:

...

Answer:

2.5768 * 107

Explanation:

Write it in a number between 1 and 9 and add decimal accordingly. So the answer is 2.5678 multiplied by 10 raised to power 7.

Ans 1. Both

Ans 2. Once inside plants, carbon moves through food chains, where organisms become nutrients including herbivores, carnivores and ultimately, decomposers. Once buried in the soil, carbon can be converted into fossil fuels over long periods of time and then also reenter the atmosphere by combustion. The Law of Conservation of Matter states that matter cannot be created or destroyed. The carbon cycle is an example of the Law

Ans 3. Most of the chemical energy needed for life is stored in organic compounds as bonds between carbon atoms and other atoms. The law of conservation of energy states that energy can not be created or destroyed. Thus, just like matter energy is also conserved in the process.

Hope it helps

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.

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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There are 6 moles in 3.612 x 10^24 particles of carbon, calculated using Avogadro's number. Avogadro's number relates the number of particles to the number of moles in a substance.

The number of moles in 3.612 x 10^24 particles of carbon can be calculated by dividing the given number of particles by Avogadro's number, which represents the number of particles in one mole of a substance.

Avogadro's number, denoted as NA, is approximately 6.022 x 10^23 particles/mol. This means that in one mole of any substance, there are 6.022 x 10^23 particles.

To calculate the number of moles from the given number of particles, we can use the following formula:

Number of moles = Number of particles / Avogadro's number

Substituting the given values into the formula:

Number of moles = 3.612 x 10^24 particles / (6.022 x 10^23 particles/mol)

Dividing the numbers:

Number of moles = 6 moles

Therefore, there are 6 moles in 3.612 x 10^24 particles of carbon.

In summary, there are 6 moles in 3.612 x 10^24 particles of carbon. This calculation is based on Avogadro's number, which relates the number of particles to the number of moles in a substance.

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