Write balanced nuclear equations for the following:(b) Formation of francium-221 through α decay

Answer:

The 5R's are Reuse, Reduce, Recycle, Repair and Recover.

Taking into account the reaction stoichiometry, the volume of O₂ is 7.28406 L when 28.5 g of hydrogen peroxide decomposes to form water and oxygen at 150 degrees c and 2.0 atm.

The balanced reaction is:

2 H₂O₂  → 2 H₂O + O₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 68 grams of H₂O₂ form 1 mole of O₂, 28.5 grams of H₂O₂ form how many moles of O₂?

moles of O₂= (28.5 grams of H₂O₂×1 mole of O₂)÷68 grams of H₂O₂

moles of O₂= 0.42 grams

Then, 0.42 moles of O₂ are formed.

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P×V = n×R×T

Where:

In this case, you know:

Replacing in the definition of the ideal gas law:

2 atm×V = 0.42 moles×0.082 (atmL)÷(molK)× 423 K

Solving:

V = (0.42 moles×0.082 (atmL)÷(molK)× 423 K)÷ 2 atm

V= 7.28406 L

Finally, the volume of O₂ is 7.28406 L.

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The presence of polar bonds in a molecule does not imply the presence of a molecular dipole. Carbon dioxide and carbon tetrachloride, for example, have polar bonds but no net molecular dipole.

Bond polarity is related to the individual polarity of the bond in a molecule, whereas molecular polarity is the sum of all the bond polarities in the molecule.

If a molecule is completely symmetric, the dipole moment vectors on each molecule cancel each other out, resulting in a nonpolar molecule.

Thus, a molecule can have bond dipoles but not have a molecular dipole.

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Answer:

5232.5J

Explanation:

Data obtained from the question. This includes the following:

Mass (M) = 250g

Initial temperature (T1) = 30°C

Final temperature (T2) = 25°C

Change in temperature (ΔT) = T1 – T2 = 30°C – 25°C = 5°C

Specific heat capacity (C) = 4.186J/g°C

Heat (Q) =.?

The heat released can be obtained as follow:

Q = MCΔT

Q = 250 x 4.186 x 5

Q = 5232.5J

Therefore, the heat released is 5232.5J

The amount of heat released when the bottle (250g) of water is cooled  is 5232.5J .

Given data:-

Mass (M) = 250g

Initial temperature (T1) = 30°C

Final temperature (T2) = 25°C

Change in temperature (ΔT) = T1 – T2 = 30°C – 25°C = 5°C

Specific heat capacity (C) = 4.186J/g°C

Heat (Q) =.?

The heat released can be obtained as follow:

\(Q = MC\delta T\\\\Q = 250\times 4.186 \times 5\\\\Q = 5232.5J\)  

 Therefore, the heat released is 5232.5J.

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Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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Answer:

D

Explanation:

Because sub-shell p have maximum no. of electrons I. E. 6

The Roman numeral in the manganese (IV) sulfide indicates : the positive charge on the manganese ion. The correct option is B.

The Manganese (IV) sulfide, chemical formula = Mn₂S₄ In the compound Manganese (IV) sulfide, the manganese (IV) contains the positively charged cation and the sulfide contains the negatively charged anion. The name of the manganese (IV) sulfide is that each of the manganese atom has the charge of +4.

Manganese = Mn⁴⁺

Sulfide = S²⁻

The chemical formula for the Manganese (IV) sulfide = Mn₂S₄. The  Roman numeral in manganese (IV) sulfide shows the positive charge on the manganese ion.

Therefore, the correct option is B.

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Answer:

The answer is C: KCN

Explanation:

KCN is a strong electrolyte. Electrolytes is inside your body to renergize you and help you stay strong.

Answer:

The produce large circular currents in all the ocean basins. Currents, The North Equatorial Current, the Gulf Stream, the North Atlantic Current, and the Canary Current.

Explanation:

If a solution has similar concentrations of ions, the compound that will precipitate first is that which has the least ksp. This is called the principle of the common ion effect.

The reduction of the presence of a common ion in a solution of a slightly soluble salt is called the common ion effect. when the common ions are in equilibrium with the solution, the solubility of the solution decreases due to the common ions' presence.

The Ksp is a solubility product constant that measures the solubility level of the solution in the given soluble salt solution. It is defined as the product of concentrations of the ions in the solution when it is in equilibrium condition with salt solid form.

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Answer:(0.500/0.750) x 98.8 = 65.9 kPa.

Explanation:

I think that's the answer

Answer:

Conduction, Convection, and Radiation .......

B. The rate doubles  if the concentration of a doubles, holding everything else constant.

There are additional reactant particles travelling together as the reactant concentration rises. Due to the increased number of collisions, the reaction rate will be higher. The rate of a reaction will rise with both the concentration of the reactants.

Many different factors, such as reactant concentration, surface area, temperature, and catalysts, affect the speed of a chemical reaction.

Reaction rate is the rate at which a chemical reaction progresses forward. It is frequently defined in terms of either the concentration of a reactant that is consumed in a period of time or the concentration of a product that is produced in a unit of time (amount per unit volume).

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The final temperature of the gas, after absorbing 1300 J of heat and doing 2200 J of work, is approximately 375.45 K.

To find the final temperature (T_final) of the gas, we can use the first law of thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat added (Q) minus the work done (W) by the system:

ΔU = Q - W

Since the gas is ideal and monatomic, the change in internal energy is related to the temperature change (ΔT) through the equation:

ΔU = nC_vΔT

where n is the number of moles and C_v is the molar heat capacity at constant volume.

Rearranging the equations and substituting the given values:

nC_vΔT = Q - W

(5.00 mol)(3/2R)ΔT = 1300 J - 2200 J

(5.00 mol)(3/2)(8.3145 J/(mol⋅K))ΔT = -900 J

Simplifying:

(37.9725 J/K)ΔT = -900 J

ΔT = -900 J / (37.9725 J/K)

ΔT ≈ -23.70 K

Since the initial temperature is 126 °C, we convert it to Kelvin:

T_initial = 126 °C + 273.15 = 399.15 K

Now we can find the final temperature:

T_final = T_initial + ΔT

T_final = 399.15 K - 23.70 K

T_final ≈ 375.45 K

Therefore, the final temperature of the gas is approximately 375.45 K.

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A 14-year-old adolescent girl, Alice, has been diagnosed with anorexia nervosa. In the assessment of Alice, the findings that are more commonly associated with anorexia nervosa are Dysmenorrhea, decreased body temperature, and Heat intolerance.

Dysmenorrhea: Anorexia nervosa can lead to hormonal imbalances and disruptions in the menstrual cycle, which can cause irregular or absent periods (amenorrhea) and sometimes dysmenorrhea (painful periods).

Decreased body temperature: Anorexia nervosa can lead to lower body weight and reduced body fat, which can result in a lower body temperature. This is a physiological response to conserve energy and maintain the body's functions.

Heat intolerance: Anorexia nervosa can affect the body's ability to regulate temperature properly, leading to increased sensitivity to heat or cold. Individuals with anorexia may feel more discomfort or intolerance in extreme temperatures.

Hence,  the findings that are more commonly associated with anorexia nervosa are explained above.

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The rate of decomposition of XO2 after 1 hour : \(\tt A=A_o.e^{-1.08}\)

Given

the half-life 38.6 min

time of decomposition = 1 hour

Required

the rate of decomposition

Solution

First-order reaction :

\(\tt A=A_o.e^{-kt}\)

the half life=t1/2 :

\(\tt t\frac{1}{2}=\dfrac{ln~2}{k}\)

so the rate constant (k) :

\(\tt k=\dfrac{ln~2}{38.6}=0.018\)

The rate after 1 hour=60 min :

\(\tt A=A_o.e^{-0.018\times 60}\\\\A=A_o.e^{-1.08}\)

Explanation:

Answer : The mass of copper is 217.3 grams.

Explanation : Given,

Moles of copper = 3.42 mole

Molar mass of copper = 63.55 g/mole

Formula used :

Now put all the given values in this formula, we get:

Therefore, the mass of copper is 217.3 grams.

The aqueous solution that has the lower freezing point is 0.60 m glucose.

Freezing point depression is the reduction in the temperature at which a liquid freezes caused by dissolved particles. The freezing point depression (ΔTf) of a solution is proportional to the molality (m) of the solute, which is the number of moles of solute per kilogram of solvent.

Freezing point depression is a colligative property, which means it depends only on the number of solute particles in the solution, not on their nature. The van't Hoff factor (i) is used to account for the dissociation of solutes in the solution. The van't Hoff factor of glucose is 1, whereas the van't Hoff factor of CaCl2 is 3.

To calculate the freezing point depression, we use the formula:

ΔTf = i * Kf * m

To calculate the freezing point depression, we use the formula:

ΔTf = i * Kf * m

The freezing point depression constant of water is 1.86 °C/m.

Thus, for the given molality of the solutions, the freezing point depression is

:ΔTfcacl2 = 3 * 1.86 °C/m * 0.60 m = 3.348 °CΔTfglucose = 1 * 1.86 °C/m * 0.60 m = 1.116 °C

Therefore, 0.60 m glucose has a lower freezing point depression than 0.60 m CaCl2.

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There are 6.022 × \(10^{23}\) in a pound mole.

Some sources define pound as pound-mass LBM while others define it as pound force (lbf or). This is analogous to the distinction between both mass and weight, which are frequently confused.

A mole is a specific amount, of atoms, electrons, and so on. The mole has approximately particles in the SI system. Although SI units officially define this as a mole, it is accurately defined as a gram mole.

A pound lump of helium is equal to 4 pounds, but a pound mass of sucrose is equal to 342 pounds. Both have the same number of basic units (Avogadro's number)—carbon atoms or sucrose molecules—but gas occurs as an atom per entity, whereas sucrose molecules include 45 atoms each.

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All of the following are involved in eukaryotic transcription EXCEPT a rho factor. The correct answer is 2.

Eukaryotic transcription is the process by which genetic information in DNA is transcribed into RNA. This process is carried out by a large complex of proteins and enzymes, including general transcription factors, transcription activators, and a transcription initiation complex.

These proteins and enzymes work together to unwind the DNA double helix, recruit the RNA polymerase enzyme to the promoter region of the gene, and begin the process of synthesizing RNA. The rho factor is not typically involved in this process, as it is specific to prokaryotic cells and is involved in the termination of transcription.

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Answer:

72.5

Explanation:

Answer:

when they are cold

Explanation:

particles will only vibrate when they are hot due to heat transfer by conduction and temperature changes as well

MARK BRAINLIEST PLEASE....i will be glad ..thank you

Answer:

particles vibrate more when they are hot.

Explanation:

This is because the heat transfer from one particle to the other causes vibrations in particles of a substance..And if the substance is cold the particles will not move and will be held in a framework

i hope it will clear your concepts...

The percentage decrease in the amount of dissolved oxygen is 10%

Percent yield is the percent ratio of actual yield to the theoretical yield. It is calculated to be the experimental yield divided by theoretical yield multiplied by 100%. If the actual and theoretical yield ​are the same, the percent yield is 100%

In chemistry, yield is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage.

From the graph,

The amount of dissolved oxygen at  15°C is 10 mg/L

The amount of dissolved oxygen at  20°C is 9 mg/L

The decrease in the amount of dissolved oxygen is 1mg/L

The percentage decrease = (1/10) × 100 = 10%

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The dot and cross diagram is a way of representing a molecule along with its valence electrons and respective bonds. Valence electrons are drawn as a dot or a cross, each element will have a different connotation. Around the atoms, circles are drawn that indicate the bonds and how the electrons are shared.

Carbon has 4 valence electrons and oxygen has 6, the dot-and-cross diagram of CO2 will be:

The boiling point of a substance can be found by using the equation: T = (delta h / delta s), where delta H is the enthalpy change and delta S is the entropy change.

To find the boiling point of a substance given the enthalpy change (delta h) and entropy change (delta s), we can use the equation:

delta G = delta H - T * delta S

Here, delta G represents the change in Gibbs free energy, T is the temperature in Kelvin, delta H is the enthalpy change, and delta S is the entropy change.

The boiling point is the temperature at which the Gibbs free energy change becomes zero, indicating that the substance is transitioning from a liquid to a gas. To find the boiling point, we rearrange the equation:

delta G = delta H - T * delta S

Solving for T:

T = (delta H / delta S)

By substituting the given values of delta H and delta S into the equation, we can calculate the boiling point of the substance.

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Answer:

B.

Explanation:

1 orbital is 4 half of 4 is 2.

Answer:

I'd say C. You can eliminate the rest of the answers and get C. Most of the iron is found up North on the map.

Explanation:

Answer:

.025 ml 02

Explanation:

I made a pdf and pasted it in and etc

Answer:

weathering

Explanation:

the rocks due to rain generate cracks . heat and wind helps the rock to break into smaller chunks .

this process continuous till the rock is converted into sand. and is called weathering