The halflife of tritium (31H) is 12.3 y. 48.0-mg of tritium is released from a nuclear power plant during the course of a mishap.What mass of the nuclide will remain after 49.2 y? and then after 98.4 y?

To determine the amount of water and methane needed, we can set up a system of equations based on the desired composition of the mixture. you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

Let's assume x represents the number of gallons of water and y represents the number of gallons of methane. We have the following information: The total volume of the mixture is 90 gallons: x + y = 90. The mixture should be 60% methane: (y / (x + y)) * 100 = 60. Simplifying the second equation: y / (x + y) = 0.6. Now we can solve the system of equations: From equation 1, we can express x in terms of y: x = 90 - y. Substituting this into equation 2: y / ((90 - y) + y) = 0.6. Simplifying further: y / 90 = 0.6. Solving for y: y = 0.6 * 90. y = 54. Now we can find x using equation 1: x = 90 - y. x = 90 - 54. x = 36. Therefore, you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

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The molecules in solid ice are more ordered and have less freedom to move compared to those in liquid water, resulting in a decrease in entropy.

When liquid water in a pond freezes and turns into solid ice, it undergoes a phase change.

This phase change involves a decrease in entropy because of water in the solid state is less than the entropy of water in the liquid state, the change in entropy (ΔS) is negative during the freezing process

This means that the water molecules become more organized and structured as they form the solid ice, which requires a reduction in the number of degrees of freedom of the water molecules.

Overall, the freezing of the pond results in a solid ice layer forming on top, which has a lower entropy than the liquid water underneath.

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The molecules in solid ice are more ordered and have less freedom to move compared to those in liquid water, resulting in a decrease in entropy.

When liquid water in a pond freezes and turns into solid ice, it undergoes a phase change.

This phase change involves a decrease in entropy because of water in the solid state is less than the entropy of water in the liquid state, the change in entropy (ΔS) is negative during the freezing process

This means that the water molecules become more organized and structured as they form the solid ice, which requires a reduction in the number of degrees of freedom of the water molecules.

Overall, the freezing of the pond results in a solid ice layer forming on top, which has a lower entropy than the liquid water underneath.

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Answer:

A television set is another device that operates by the transformation of energy. An electrical beam from the back of the television tube strikes a thin layer of chemicals on the television screen, causing them to glow. In this case, electrical energy is converted into light.

Explanation:

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The amount in moles of the excess reactant left is 0.5 mole.

Balanced equation- 2ZnS (s) + 3O₂(g) --> 2ZnO (s) + 2SO₂(g).

What is another name for zinc sulfide?

From the balanced equation,

2 moles of ZnS reacted with 3 moles of O₂

How to determine the excess reactant

From the balanced equation,

2 moles of ZnS reacted with 3 moles of O₂

Therefore,

4.2 moles of ZnS will react with =(4.2 × 3) / 2 = 6.3 moles of O₂

From the calculations made above, we can see that only 6.3 moles of O₂ out of 6.8 moles given, is required to react completely with 4.2 moles of ZnS.

Thus, ZnS is the limiting reactant and O₂ is the excess reactant.

How to determine the mole of the excess reactant remaining

The excess reactant is O₂. Thus the mole remaining after the reaction can be obtained as illustrated below:

Mole of O₂ given = 6.8 moles

Mole of O₂ that reacted = 6.3 moles

Mole of O₂ remaining =?

Mole of O₂ remaining = (Mole of O₂ given) - (Mole of O₂ that reacted)

Mole of O₂ remaining = 6.8 - 6.3

Mole of O₂ remaining = 0.5 mole

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Explanation:

B. Recycles slowly

And it also depends on the organism

The component that is missing from the process of photosynthesis in the reaction is sunlight so the reaction is Carbon Dioxide + Water + sunlight → Glucose + Oxygen (Option A).

The biological process of photosynthesis reres to a series of chemical reactions by which plants can produce glucose in presence of sunlight which is a reactant.

Therefore, with this data, we can see that the biological process of photosynthesis is capable of generating sugars or glucose by using light from the sun and water.

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The grams of aluminium extracted from 5000g of alumina is 2647 grams

Let's calculate the molecular mass of Al₂O₃

Al₂O₃ = 27 × 2 + 16 × 3 = 54 + 48 = 102 g/mol

Therefore,

102 g of Al₂O₃ = 54 g of aluminium  

5000g of Al₂O₃  = ?

mass of aluminium produced = 5000 × 54 / 102

mass of aluminium produced = 270000 / 102

mass of aluminium produced  = 2647.05882353

mass of aluminium produced  = 2647 grams

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Answer:

D

Explanation:

Cell membrane, also called plasma membrane, thin membrane that surrounds every living cell, delimiting the cell from the environment around it.

Nothing would happen if the solutions were switch so that the first incubation was in the pH 8 solution and he second one was in the pH 4 solution.

The H+ gradient would be in the wrong direction, ATP synthase would not work.

pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

pH is an important quantity that reflects the chemical conditions of a solution. The pH can control the availability of nutrients, biological functions, microbial activity, and the behavior of chemicals.

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Answer:

Ionization smoke detectors use americium as a source of alpha particles. Alpha particles from the americium source ionize air molecules. This makes some particles positively charged and some negatively charged. ... Because of this shielding, the smoke detector poses no radiation health risk when they are properly handled.

Explanation:

Hope this helped! :D

When hydrogen and oxygen combine to form water (H2O), the limiting reactant is determined by the relative numbers of hydrogen and oxygen molecules present. The limiting reactant is the reactant that is completely consumed in a reaction, and it limits the amount of products that can be produced.

The reactant that is present in excess is called the excess reactant. The balanced chemical equation for the reaction of hydrogen gas (H2) and oxygen gas (O2) to form water (H2O) is:2H2(g) + O2(g) → 2H2O(g)To figure out which reactant is the limiting reactant, we must first convert the given masses of hydrogen and oxygen to the number of moles present. We can use the molar mass of each substance and the given masses to determine the number of moles:

Mass of hydrogen (H2) = 5.00 gMolar mass of H2 = 2.02 g/molNumber of moles of H2 = 5.00 g / 2.02 g/mol ≈ 2.48 molMass of oxygen (O2) = 10.0 gMolar mass of O2 = 32.00 g/molNumber of moles of O2 = 10.0 g / 32.00 g/mol ≈ 0.3125 molBased on the balanced chemical equation, we can see that 2 moles of hydrogen react with 1 mole of oxygen to form 2 moles of water.

Therefore, for every mole of oxygen that reacts, 2 moles of hydrogen are required. Since we have more moles of hydrogen than moles of oxygen, hydrogen is present in excess and oxygen is the limiting reactant.The limiting reactant is the reactant that is completely consumed in the reaction and it limits the amount of products that can be produced. Therefore, in the reaction between hydrogen and oxygen, oxygen is the limiting reactant.

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The ground state configuration : 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p¹

Electrons can move the shell up or down by releasing energy or absorbing energy  

It can be concluded that there are 2 conditions:  

Ground-state is the state of electrons filling the shell with the lowest energy levels.  

Excited-state is the state of electrons which occupies a higher energy level  

The state of excited electrons can be seen from the presence of electrons which do not fill the shell completely but fill the shell afterward  

Gallium (Ga) is a metal located in group 13, p-block and  period 4

Atomic number : 31

If we look at the options:

options 1,2 and 3 do not conform to Aufbau principle(Electrons occupy orbitals of the lowest energy level  ), because 3d orbitals do not exist and the number of electrons is also not 31

So that the most appropriate electron configuration is:

1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p¹ = 31 electrons

or we can write : [Ar] 4s² 3d¹⁰ 4p¹

Answer:

In a scientific investigation, hypothesis is the name for a prediction.

Answer:

Nonpolar molecules dissolve in nonpolar solvents through a process called dispersion forces or London forces.

In nonpolar molecules, the electrons are evenly distributed and there is no permanent dipole moment, which means that the molecule has no positive or negative poles. When nonpolar molecules are added to a nonpolar solvent, such as oil or hexane, the molecules are attracted to one another due to London dispersion forces.

London forces are due to temporary fluctuations in electron density within molecules, creating temporary dipoles. These temporary dipoles induce corresponding temporary dipoles in other nearby molecules, attracting them to each other. The strength of the London dispersion forces increases with the size of the molecule, since larger molecules have more electrons and a greater potential for temporary dipoles.

In general, nonpolar molecules bind together in nonpolar solvents through these weak intermolecular forces, allowing them to dissolve and form a homogeneous solution.

Explanation:

Answer: electrons have a wave like character and can be solved with wave equations

Explanation: it’s the answer

Schrödinger's solution to the wave equation agreed with the Rydberg constant, proving electrons have a wave-like character and can be solved with wave equations. The correct option is C.

Schrödinger's solution tells the position of an electron is space and time. It also tells the energy and position of electrons. It describes the wave nature of the electron.

Rydberg constant is the unit of energy. Its symbol is Ry. It is equivalent to the photon's energy, whose wave number is the Rydberg constant. It is a physical constant.

Either the exponential or the trig functions must be chosen; not both. Particles are traveling left and right in the sin and cos solutions, which represent states of definite energy.

Thus, the correct option is C. Electrons have a wave-like character and can be solved with wave equations regarding Schrödinger's solution.

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Answer:

ok so im gonna go and do some for your latest questions then if thats alright with you

Explanation:

i need points so im trying to help as many people as i can before the end of the day.

but you have to make the questions forst so i can help you understand them

Answer:

All are reflective except for stone

i guess it is stone

Explanation:

Hope it helps!!!

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Yes, Iron reacts with O2 to give an iron oxide.

When iron comes in contact with oxygen in presence of water it gives ferric oxide, Also known as rust is formed.

The balanced chemical reaction of above is given as follows,

4Fe + 3O2 + x. H2O → 2Fe2O3.xH2O.

A redox commerce between oxygen and iron in a water-rich terrain, similar as largely sticky air, results in the conformation of rust. The rusting of iron is characterised by the conformation of a subcaste of a red, short substance that readily breaks into greasepaint. The rusting process can be stopped or braked down with a fleece of oil painting. A high- quality makeup will also help to decelerate down rusting by keeping humidity from getting to the essence.

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Answer:

4.39 ×  \(10^{-4}\) m/sec

Explanation:

Answer:

D. At different distances from the nucleus

Explanation:

Electrons are found outside the nucleus on electron shells.

These electron shells extend outwards from the nucleus, so the electrons are found at different distances further away from the nucleus if they are on different electron shells.

pH of the buffer solution is 0.18.

The following expression can be used to determine the pH of an acidic buffer solution:

pH = pka + log ([A-] / [HA])

We can determine the salt and acid concentrations by changing the supplied values in the expression above.

[Salt] = 6 M

[Acid] =  4 M

Change the values in the equation above.

pH = 1.32 * 10⁻⁵ + log

pH = 1.32 * 10⁻⁵ + 0.17609

pH = 0.0000132 + 0.17609

pH = 0.1761032

pH = 0.18

As a result, the buffer solution's pH is 0.18.

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According to the question of isotope, the solution with question is given below:

Isotopes are atoms of the same element that have different numbers of neutrons. They have the same atomic number and chemical properties, but because of their different mass numbers, they behave differently in processes such as chemical reactions and nuclear reactions. Isotopes are used for many purposes in science and technology, such as radiometric dating, nuclear medicine, and nuclear energy production. Different isotopes of the same element often have varying levels of radioactive decay and may be employed to trace elements in biological systems. Some isotopes can even be used to create weapons of mass destruction.

1. A sample contains 0.80 moles of Carbon-14, 0.20 moles of Carbon-12. What is the isotopic abundance of Carbon-14?

-> Isotopic abundance of Carbon-14 = 0.80 / (0.80 + 0.20) = 0.80 or 80%

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Answer:

D. 18.3 mL

Explanation:

as we can see its above the line 18mL so C definitely cancels out and as its not a very accurate measurement so we cannot put 2 or three significant at least. cause we are not sure of the answer but get at least that the value is above somewhat above 18mL, thus D is our answer.

To calculate the mass of KNO3 created during the reaction, first compute the moles of KNO3 formed. Because the reaction involves a 1:2 mole ratio of K2CrO4 to KNO3, the moles of KNO3 formed can be calculated by multiplying the moles of K2CrO4 by 2.

As a result, 0.040 mol K2CrO4 x 2 = 0.080 mol KNO3. We can determine the mass of KNO3 created now that we know the moles of KNO3 formed by multiplying the moles of KNO3 by its molar mass. Thus, 0.080 mol KNO3 multiplied by 101.11 g/mol equals 8.089 g KNO3.

When 100.mL of 0.40 M potassium chromate solution is introduced to excess silver nitrate, the reaction can produce 8.089 g of KNO3.

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Answer:

30 degrees Celsius, is 86 Fahrenheit.

273 kelvin, is 31.73 Fahrenheit.

0 degrees Celsius, is 32 Fahrenheit.

Then 32 degrees Fahrenheit.

The correct answer choice is A. 30 degrees Celsius.

No, the NaOH test for calcium ions does not work when NaOH is added to limewater.

Limewater is a solution of calcium hydroxide, Ca(OH)2, which is already a base. When NaOH is added to limewater, there is no significant change in pH and no visible precipitate of calcium hydroxide is formed. The NaOH test is used to detect the presence of metal ions in solution, such as calcium, magnesium, and aluminum ions. When NaOH is added to a solution containing these ions, the hydroxide ions react with the metal ions to form metal hydroxide precipitates, which are typically white in color. However, since limewater already contains calcium ions in the form of calcium hydroxide, the addition of NaOH does not cause any visible change.

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Answer: atoms do have 3 subatomic particles but the nucleus is positive and the nucleus consists of protons and neutrons. Its positive because neutrons have no charge and protons have a positive charge. There are only electrons on the shells so no neutrons or protons on the shells

Explanation:

Answer: 5.59 L

Explanation: I'm pretty sure it's this. I just took this test and got it right. Hope this helps you out! :))

Answer:

5.59 L

Points earned on this question: 4

Explanation:

took the test

Answer:

Para que se cumpla el balanceo en la reacción química, en el espacio se debe asignar 2 como coeficiente estequiométrico.

Explanation:

La ley de conservación de la materia establece que, dado que no se puede crear ni destruir ningún átomo en una reacción química, el número de átomos que están presentes en los reactivos debe ser igual al número de átomos presentes en los productos.

Luego, debes equilibrar la ecuación química. Para eso, primero debe mirar los subíndices al lado de cada átomo para encontrar el número de átomos en la ecuación. Si el mismo átomo aparece en más de una molécula, debes sumar sus cantidades.

Los coeficientes ubicados frente a cada molécula indican la cantidad de cada molécula para la reacción. Este coeficiente puede modificarse para equilibrar la ecuación, del mismo modo que nunca debe alterar los subíndices.

Al multiplicar el coeficiente mencionado por el subíndice, obtienes la cantidad de cada elemento presente en la reacción.

En este caso la reacción química es:

Fe₂O₃ + 3 H₂O ⇒ ____ Fe(OH)₃

Entonces, teniendo en cuenta todo lo anterior, se puede determinar la cantidad de elementos en cada lado de la ecuación:

Se puede observar que la reacción química no esta balanceada porque se tiene diferentes cantidades de cada elemento a cada lado de la reacción. Para equilibrarla, se comienza balanceando el hierro. Para eso, el coeficiente estequiométrico debe ser dos:

Fe₂O₃ + 3 H₂O ⇒ 2 Fe(OH)₃

Entonces:

Ahora, a cada lado de la reacción se tiene la misma cantidad de cada elemento, por lo que la reacción esta balanceada.

Para que se cumpla el balanceo en la reacción química, en el espacio se debe asignar 2 como coeficiente estequiométrico.