What characteristics do atoms of manganese- 55, iron-56, and nickel-58 have in common?​

The velocity of electron from odium is 6.86 × 10 ⁻¹⁹ and from potassium is 7.35 × 10⁵ .

hf = φ₀ + Eₓ

where h is planks constant , f is frequecy of light , φ₀ is ionisation potential

and  Eₓ is kinetic energy of emitted electron

f = c/λ

where c is speed of light and λ is wavelength of radiation

so Eₓ = hc/λ -  φ₀

h=6.63×10⁻³⁴  joule/hertz

so  hc/λ = (6.63×10⁻³⁴×3×10⁸)/(290×10⁻⁹)

=> (19.89× 10⁻²⁶)/(2.9 × 10⁻⁷)

=> 19.89/2.9 × 10 ⁻¹⁹

=> 6.86 × 10 ⁻¹⁹

Eₓ = 1/2×m×v²

=> v = √2Eₓ/m

where m= mass of electron and v is velocity of electorn

for velocity of elctron in odium we have:

Eₓ = 6.86 × 10 ⁻¹⁹ - 3.68 × 10 ⁻¹⁹

=> 3.18 × 10 ⁻¹⁹

so v = √2Eₓ/m

m = 9.1 × 10⁻³¹

so v = √2×3.18 × 10 ⁻¹⁹/9.1 × 10⁻³¹

=> v = √ 0.7 × 10¹²

=> v = √ 70 × 10¹⁰

=> 8.36 × 10⁵ m/s

so velocity of electron from odium is  8.36 × 10⁵ m/s

(ii) we need to find speed of electron from potasium

Eₓ = 6.86 × 10 ⁻¹⁹ - 4.41 × 10 ⁻¹⁹

=> 2.45 × 10 ⁻¹⁹

so v = √2Eₓ/m  

m = 9.1 × 10⁻³¹

so v = √2×2.45 × 10 ⁻¹⁹/9.1 × 10⁻³¹

=> v = √ 0.54 × 10¹²

=> v = √ 54 × 10¹⁰

=> 7.35 × 10⁵ m/s

so velocity of electron from potaium is  7.35 × 10⁵ m/s

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An aqueous sample is analyzed to contain 4% naoh (4 g in 96 ml water). The concentration of the NaOH solution is 1 M.

To calculate the concentration of the NaOH solution in molarity (M), follow these steps:
1. Determine the moles of NaOH in the solution:
We know that the solution contains 4 g of NaOH. To convert this to moles, use the molar mass of NaOH (Na = 23 g/mol, O = 16 g/mol, H = 1 g/mol).
Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol
Now, divide the mass of NaOH by its molar mass:
moles of NaOH = (4 g NaOH) / (40 g/mol) = 0.1 mol
2. Determine the volume of the solution in liters:
We are given that the volume of the solution is 100 mL. To convert this to liters, divide by 1000:
Volume in liters = 100 mL / 1000 = 0.1 L
3. Calculate the molarity of the solution:
Molarity (M) = moles of solute / volume of solution in liters
Molarity (M) = 0.1 mol / 0.1 L = 1 M

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Answer:

The balanced chemical equation for the combustion of methane is:

CH4 + 2O2 → CO2 + 2H2O

From the equation, we can see that 1 mole of methane reacts with 2 moles of oxygen to produce 1 mole of carbon dioxide and 2 moles of water.

The molar mass of methane (CH4) is:

(1 x 12.01 g/mol) + (4 x 1.01 g/mol) = 16.05 g/mol

To calculate the amount of oxygen required for the combustion of 128g of methane, we need to first convert the mass of methane to moles:

128 g CH4 ÷ 16.05 g/mol = 7.98 mol CH4

According to the stoichiometry of the balanced equation, 2 moles of oxygen are required for every 1 mole of methane that reacts. Therefore, we need:

7.98 mol CH4 x (2 mol O2 / 1 mol CH4) = 15.96 mol O2

Finally, we can convert the moles of oxygen to grams:

15.96 mol O2 x 32.00 g/mol = 511.2 g O2

Therefore, 511.2 g of oxygen are required for the complete combustion of 128g of methane.

Option b-A The isotope ⁷₂H (7He) is more tightly bound than ⁵₂H (5He).

The stability of an isotope depends on its binding energy, which represents the amount of energy required to break apart the nucleus into its constituent particles. Higher binding energy indicates greater stability and tighter binding of nucleons within the nucleus.

To determine which isotope is more tightly bound, we compare their binding energies. The binding energy is related to the mass defect, which is the difference between the sum of the masses of the individual nucleons and the actual mass of the nucleus.

In this case, the atomic mass of ⁷₂H (7He) is 7.027991 u, and the atomic mass of ⁵₂H (5He) is 5.012057 u. The greater the mass defect, the more tightly bound the nucleus. Since the mass defect of ⁷₂H (7He) is greater than that of ⁵₂H (5He), it implies that ⁷₂H (7He) has a higher binding energy and is more tightly bound.

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Answer:

This explanation could be improved by specifying the two substances being compared and giving more detailed information about their properties, such as their chemical structure, molecular formula, and other physical and chemical characteristics. Additionally, describing why the two substances have different properties, such as differences in bonding type or molecular arrangement, could provide a more comprehensive explanation.

Explanation:

Hey there!

The volume of an object: The volume of a water displaced by the object.

So, at first we need to find the volume of a water displaced by the object.

On the first figure the initial volume of a water is 60.5ml . Similarly, in second figure when an object is immersed then its volume is 90ml.

Now, volume of a water displaced =?

We have;

Displaced volume = final volume - initial volume.

Or, displaced volume = (90 - 60.5) ml.

= 29.5ml.

As per the condition, volume of a water displaced by the object = volume of an object.

Therefore, the volume of an object is 29.5ml.

Hope it helps...

Answer:

The rate of dissolving of a solute in a solvent is faster when the solute and solvent are stirred, the solvent is warmer, or the solute consists of smaller particles with more surface area.

The amount of Ca(OH)₂ produced = 5.2 g which is calculated in the below section.

NUMBER OF MOLES of HCl = Molarity of solution x Volume of Solution

# of moles of HCl = (0.40 mol/L ) x 350 mL

                              = (0.40 mol/L ) x 0.350 L

                              = 0.14 mol

The mass of HCl that makes 0.14 mol of HCl

Mass of HCl= # of moles x molar mass of HCl

Mass of HCl = 0.14 mol x 36.5 g/ mol

Mass of HCl = 5.11g

As per Stoichiometry , 1g of HCl reacts with 1.015 g of Ca (OH)₂

So, 5.11g of HCl can react with 5.11 x 1.015  g

                                                 = 5.1865 g or 5.2 g of Ca(OH)₂

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The mass of magnesium cyanide needed to prepare the solution is 1.57 g

We'll begin by calculating the number of mole of Mg(CN)₂. This can be obtained as follow:

Volume = 275 mL = 275 / 1000 = 0.275 L

Molarity of Mg(CN)₂ = 0.075 M

Mole = Molarity x Volume

Mole of Mg(CN)₂ = 0.075 × 0.275

Mole of Mg(CN)₂ = 0.020625 mole

Mole of Mg(CN)₂ = 0.020625 mole

Molar mass of Mg(CN)₂ = 24 + 2(12 + 14) = 76 g/mol

Mass = mole × molar mass

Mass of Mg(CN)₂ = 0.020625 × 76

Mass of Mg(CN)₂ = 1.57 g

Therefore, 1.57 g of Mg(CN)₂ is needed to prepare the solution

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Limiting chemical application of pesticides while introducing non-chemical methods of pest control in an orchard is an example of integrated pest management (IPM).

IPM is a holistic approach to pest management that seeks to minimize the use of chemical pesticides while maximizing the use of non-chemical pest control methods such as biological control, cultural control, and physical control. This approach involves monitoring pests and their natural enemies, setting action thresholds, and using a combination of tactics to manage pests in a way that is effective, economically viable, and environmentally sustainable.

IPM is an important strategy for reducing the negative impacts of pesticide use on human health, non-target organisms, and the environment, while still maintaining crop yields and profitability for growers.

By adopting an IPM approach, orchard managers can reduce their reliance on chemical pesticides and create a healthier and more sustainable agricultural system.

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Hence, the correct option is D) C5H7O3.

Nicotine is an addictive substance that is found in cigarettes.

The chemical formula for nicotine is C10H14O6.

To determine the empirical formula, one must find the smallest whole-number ratio of the atoms present. For that, we need to divide the subscripts by their greatest common divisor which in this case is 2.

According to the question, the chemical formula of nicotine is C10​H14​O6​.We need to determine its empirical formula.

To do this, we divide each subscript by their greatest common divisor which is 2 in this case.C10H14O6→C5H7O3Therefore, the empirical formula of Nicotine is C5H7O3.

Hence, the correct option is D) C5H7O3.

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Answer:

reluctantly she pulled away, her pulse and respiration in a race.

its function is less that of respiration that of FIG.

the least wind raises clouds of fine dust, which fill the air, render it so opaque as to obscure the noonday sun, and make respiration difficult.

The two most significant synthetic reactions of Grignard reagents are addition to carbonyl compounds to produce alcohols and carbonation to make carboxylic acids.

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When sodium phosphate reacts with sulfuric acid, forming sodium sulfate and phosphoric acid, the stoichiometric coefficient for sulfuric acid in the balanced chemical equation is 3.

In every balanced chemical equation, the total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side. The stoichiometric coefficient is the number written in front of each reactants and products that tells how many moles of each are needed in the reaction.

The chemical equation for the given reaction is:

\(Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(Na_{2} SO_{4}\) + \(H_{3} PO_{4}\)

Put the necessary stoichiometric coefficient to balance each element.

Balancing Na:

\(2Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(H_{3} PO_{4}\)

Balancing P:

\(2Na_{3} PO_{4}\) + \(H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

Balancing S:

\(2Na_{3} PO_{4}\) + \(3H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

Notice that H and O are already balanced.

Hence, the balanced chemical equation for the reaction is:

\(2Na_{3} PO_{4}\) + \(3H_{2} SO_{4}\) = \(3Na_{2} SO_{4}\) + \(2H_{3} PO_{4}\)

where 3 is the stoichiometric coefficient of sulfuric acid, \(H_{2} SO_{4}\).

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Answer:

what question do you need help with

Explanation:

Two form of isomer shown by Alanine amino acid is

                 a) L- alanine

                 b) D- alanine

Type of isomerism shown is Stereoisomers.

Amino acids are molecules that combine to form proteins. Amino acids and proteins are the constructing blocks of life. When proteins are digested or broken down, amino acids are left. The human body uses amino acids to make proteins to assist the body.

Amino acids are required for the synthesis of body protein and other important nitrogen-containing compounds, which include creatine, peptide hormones, and some neurotransmitters. Despite the fact that allowances are expressed as protein, a the organic requirement is for amino acids.

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Blue had a greater affinity for the solvent in water and pink had greater affinity for the paper.

Separation method based on a binding interaction between immobilized ligand and binding partner is called Affinity chromatography.

It is more preferable to use less polar solvent, for example ethanol, so that the non-polar compounds travel up the paper while the polar compounds stick to the paper, hence, separating them

Affinity chromatography has become very important in work with biological samples and pharmaceutical agents.

To achieve accurate results with affinity chromatography:

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Answer:

To calculate the mass of a single atom, first look up the atomic mass of carbon from the periodic table.

This number, 12.01, is the mass in grams of one mole of carbon. One mole of carbon is 6.022 x 1023 atoms of carbon (Avogadro's number). This relation is then used to 'convert' a carbon atom to grams by the ratio:

mass of 1 atom / 1 atom = mass of a mole of atoms / 6.022 x 1023 atoms

Plug in the atomic mass of carbon to solve for the mass of 1 atom:

mass of 1 atom = mass of a mole of atoms / 6.022 x 1023

mass of 1 C atom = 12.01 g / 6.022 x 1023 C atoms

mass of 1 C atom = 1.994 x 10-23 g

Answer

The mass of a single carbon atom is 1.994 x 10-23 g.

Explanation:

Answer: 0.188 kJ

Explanation: (0.46g C2H5Cl)(1 mol C2H5Cl/64.51g C2H5Cl)(26.4 kJ/1 mol C2H5Cl) = 0.188 kJ

I hope this helps!

The heat of vaporization is the quantity of heat which needs to be absorbed to vaporize a particular quantity of a liquid at a constant temperature. The kilojoules of heat absorbed is 0.177 kJ.

The molar heat of vaporization is defined as the energy which is required to vaporize one mole of a liquid. The units are usually kilojoules per mole, or kJ/mol. It is an important part of energy calculations which tells how much energy is needed to boil each mole of substance on hand.

Since the vaporization and condensation of a given substance are the exact opposite processes, the numerical value of the molar heat of vaporization is same as the numerical value of the molar heat of condensation.

0.46 g C₂H₅Cl × 1 mol C₂H₅Cl / 64 g C₂H₅Cl × 24.7 kJ / 1 mol = 0.177 kJ

Thus the kilojoules of heat absorbed is 0.177 kJ.

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Answer:

Oxygen Doesn't change

However, Li is oxidized (0 to +1), Na is reduced (+1 to 0)

Explanation:

On reactant side, Oxygen has -2 oxidation charge because we know common oxidation states such as oxygen -2, hydrogen +1 etc.

So NaOH, O is -2, H is +1, so Na has to be +1 to equal total charge of compound

In product side, LiOH, again O has to be -2, H is +1, so Li +1 as well..

We see that oxygen oxidation state doesn't change. However, for Li it becomes oxidized going from 0 to +1 whereas, Na is reduced going from +1 to 0.

As per the given value of \([H^+]\), the pOH of the solution is 9.

To calculate the [OH-] s well as a pH of a solution with a given [H+], we can use the equation:

pH + pOH = 14

Given that:

\([H^+] = 1.0*10^{-5} M\)

First we need to Calculate [OH-]

We know that, water undergoes autoionization to form H+ and OH- ions, we can use the following equation:

\([H^+] * [OH^-] = 1.0*10^{-14} M^2\)

Plugging in the given [H+] value, we have:

\((1.0*10^{-5 }M) * [OH^-] = 1.0*10^{-14} M^2\)

Solving for [OH-]:

[OH-] = \((1.0*10^{-14} M^2) / (1.0*10^{-5} M) = 1.0*10^{-9} M\)

Therefore, the [OH-] of the solution is \(1.0*10^{-9\) M.

Now we need to Calculate pH

Using the relationship between [H+] and pH:

pH = -log[H+]

Plugging in the given [H+] value:

pH = -log(1.0x\(10^{-5\)) = 5

Therefore, the pH of the solution is 5.

Next is to Calculate pOH

Using the equation:

pOH = 14 - pH

Plugging in the calculated pH value:

pOH = 14 - 5 = 9

Therefore, the pOH of the solution is 9.

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The percent by mass of calcium hydroxide in the solution : 15.41%

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight/volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

Mass of solute (Ca(OH₂-Calcium hydroxide) : 28.5

Mass of solution = 185 g

\(\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%\\\\\%mass=\dfrac{28.5~g}{185~g}\times 100\%\\\\\%mass=15.41\%\)

15.41% is the percent by mass of calcium hydroxide (CaOH) in the solution.

Percent mass of any solute in the solution will be define as:

% mass = (mass of solute / mass of solution) × 100%

In the question given that,

Mass of solute calcium hydroxide (CaOH) = 28.5 g

Mass of solution i.e. water = 185 g

Noe we put these values on the above equation to calculate the % mass of CaOH in the solution as:

% mass = (28.5/185) × 100% = 15.41%

Hence, the percent mass of CaOH is 15.41%.

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Natural selection is a process in which organisms that are better adapted to their environment tend to survive and produce more offspring. These offspring are likely to inherit the traits that made their parents successful, which can lead to predominance and suppression of certain traits in a population.

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\( \frac{no {}^{2} }{1} = \frac{nmgo}{2} \)

\(nmgo = no {}^{2} \times 2 = 7.2 \times 2 = 14.4\)

Note that n stands for the number of moles.