A radioactive substance decays at an exponential rate of 3.3% each year. Determine
the amount of radioactive substance after 63 years if the original amount of
substance was 193mg.

Answer:

light, temperature, water, humidity, and nutrition.

In order to properly balance an equation, we need to make sure that the same amount of elements on the reactants side matches the number of elements on the products side, we can do that by increasing the number in front of each molecule, the so called stoichiometric coefficient. In the reaction from the question we can properly balance by adding the following stoichiometric coefficients

In our case we have the following reaction:

HNO3 + NaOH -> NaNO3 + H2O, this will be the product for this reaction and also as you can see based on the previous explanation, this reaction is already balanced

The dilute solution have a final volume of 1 L or 1000 ml with a concentration of 0.00383 M. The concentration of 14.55 mL initial solution is 0.26 M.

Molarity of a solution is the number of moles of solute per volume of solution in liter. Molarity is temperature dependant. Other concentration terms are normality, parts per million, molality etc.

Dilution is the process by which a solution is changes to less concentrated one. Where the number of ions per volume of the solution will be less.

It is given that the 25 ml of the potassium nitrate solution from the 125 ml of diluted stock solution is again diluted to 1000 mL. The final molarity is obtained as 0.00383 M.

Thus we can find the molarity of the original olution by the relation written below:

M1V1 =M2V2

1000 ml × 0.00383 M = M2 × 14.55 mL

M2 =  (1000 ml × 0.00383 M )/14.55

     = 0.26 M.

Hence, concentration of the original solution is 0.26 M.

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Assuming the concentration of stock solution is 50% sodium phosphate buffer solution, the volume of stock solution required is 6 mL and the volume of water required is 6 mL.

The process of preparing solutions from stock solutions of higher concentration is known as dilution.

Dilution is done with the aid of the dilution formula given below:

where

From the data provided:

C1 is not given

V1 is unknown

C2 = 25%

V2 = 12 mL

Volume of stock, V1, required is calculated as follows:

V1 = C2V2/C1

V1 = 25 × 12 /50

V1 = 6 mL

Therefore, the volume of stock solution required is 6 mL and the volume of water required is 6 mL.

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Determining the exact time of death based solely on the condition of a body can be challenging and imprecise. However, several factors can provide some insight into the estimated time since death.

In the given scenario, the body has lost its nails and its tissues have died, indicating some level of decomposition.During mild temperatures in the spring, the rate of decomposition is typically faster compared to colder or hotter conditions. Under such circumstances, and assuming no significant external factors affecting decomposition (e.g., burial or covering), a rough estimate suggests that the person may have been deceased for several weeks to a few months.The loss of nails and tissue death suggest the progression of decomposition beyond the early stages. In the initial days following death, the body undergoes autolysis, where enzymes within the body's cells begin breaking them down.

This is followed by putrefaction, the breakdown of tissues by bacteria and other microorganisms. During putrefaction, nails and other keratinous structures can detach.However, it's important to note that various factors such as body size, health conditions, humidity, and exposure to insects and scavengers can influence the rate of decomposition. Therefore, the estimated time since death should be considered approximate, and a forensic examination conducted by professionals would provide a more accurate determination.

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Answer:

D) n = 2.5, ℓ = 0, mℓ = 0

Explanation:

According to the rules governing acceptable quantum numbers, the value for n must be an integer. Therefore, the set {n = 2.5, ℓ = 0, mℓ = 0} is not allowed.

Answer: 14.278880821321199

Explanation:

Answer:

521.12323

Explanation:

I thought it was related to spanish a spanish question Im sorry :(

Answer:

It means that you are active in the day and not active in the night.

Explanation:

Like owls for example.

Aluminum hydroxide is amphoteric. because it reacts with each acid and base. like any traditional base, the OH radical in Al(OH)3 neutralizes H+ to water and aluminum salt. Al(OH)three stable will also react with extra OH– to dissolve and shape the complicated ion [Al(OH)4]−.

Aluminum is uncommon because it's miles a reactive metallic that does not react with water. Its surface bureaucracy is a protective layer of aluminum oxide that continues water far away from the metal under. The equipment used to react steel with steam and collect the fuel produced is shown beneath.

Aluminum oxide is created on the surface of the steel, however, the reaction doesn't is going similarly because the oxide formed isn't porous, so water may not be able to penetrate through the metal to preserve the oxidation reaction any similarly.

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Answer:

2.48 × 10⁴ mol

Explanation:

Step 1: Write the balanced equation

2 CrO₄²⁻ + 3 SO₂ + 4 H⁺ ⇒ Cr₂(SO₄)₃ + 2 H₂O

Step 2: Calculate the reacting moles of CrO₄²⁻

3.00 × 10⁸ L of 5.50 × 10⁻² mM CrO₄²⁻ react. The reacting moles are:

3.00 × 10⁸ L × 5.50 × 10⁻² × 10⁻³ mol/L = 1.65 × 10⁴ mol

Step 3: Calculate the reacting moles of SO₂

The molar ratio of CrO₄²⁻ to SO₂ is 2:3. The reacting moles of SO₂ are 3/2 × 1.65 × 10⁴ mol = 2.48 × 10⁴ mol.

1584 Kg of SO2 is required to treat 3.00 x 10^8 L of 5.50 x 10^-2 mM Cr(VI).

The equation of the reaction is;

2CrO4^2-(aq) + 3SO2(g) + 4H^+(aq) -------> Cr2(SO4)3(s) + 2H2O(l)

Number of moles of Cr(VI) = concentration × volume

concentration =  5.50 x 10^-2 mM or 5.5 x 10^-5 M

volume =  3.00 x 10^8 L

Number of moles of Cr(VI) = 5.5 x 10^-5 M × 3.00 x 10^8 L

= 1.65 x 10^4 moles

From the reaction equation;

2 moles of Cr(VI) reacts with 3 moles of SO2

1.65 x 10^4 moles reacts with  1.65 x 10^4 moles ×  3 moles/2 moles

= 24750 moles

Mass of SO2 = 24750 moles × 64 g/mol

Mass of SO2 = 1584 Kg of SO2

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There are numerous ways to determine whether lead is present in an ore. Atomic absorption spectroscopy is a popular approach. With this method, an ore sample is dissolved in acid and then atomized in a flame or plasma.

The sample's atoms will absorb light at particular wavelengths that are peculiar to the element under investigation. The amount of light absorbed can be used to calculate how much lead is present in the sample. Inductively coupled plasma mass spectrometry and X-ray fluorescence spectroscopy are further techniques. It is crucial to remember that these procedures call for specialized tools and training, thus they ought to only be carried out in a lab by qualified experts.

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Answer:

In the case of Mount Pinatubo, the result was a measurable cooling of the Earth's surface for a period of almost two years. Because they scatter and absorb incoming sunlight, aerosol particles exert a cooling effect on the Earth's surface.

Explanation:

Temperature measures the average kinetic energy of particles of the substances. Therefore, the Mt. Pinatubo eruption result in global temperatures dropping almost two degrees.

Temperature is used to measure degree or intensity of heat of a particular substance. Temperature is measured by an instrument called thermometer.

Temperature can be measured in degree Celsius °c, Kelvin k or in Fahrenheit. Temperature is a physical quantity. Heat always flow from higher temperature source to lower temperature source.

We can convert these units of temperature into one another. The relationship between degree Celsius and Fahrenheit can be expressed as:

°C={5(°F-32)}÷9

The Mt. Pinatubo eruption result in global temperatures dropping almost two degrees because they scatter and absorb incoming sunlight, aerosol particles exert a cooling effect on the Earth's temperature.

Therefore, the Mt. Pinatubo eruption result in global temperatures dropping almost two degrees.

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The maximum amount of product that can be obtained from given amounts of reactants in a chemical reaction. The correct answer is C.

A chemical reaction is a process that causes one group of chemical components to change chemically into another. Reactants are substances that interact to make new substances, whereas products are those substances that result from the interaction.

Chemical Reaction Types

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Answer:

C=5

H=12

O=2•8=16

Second one

C=1•5=5

H=2•6=12

O=10+6=16

Explanation:

Container 3 has the gas stored at the highest temperature.

Temperature is a measure of the average kinetic energy of the particles in a substance. In the given table, it is stated that container 3 has a large number of collisions with container walls, high average kinetic energy, and large number of particles with large spaces between them.

These properties indicate that the gas in container 3 has higher kinetic energy and more vigorous movement compared to the other containers.

Container 1 has a low number of collisions with container walls and a medium average kinetic energy. This suggests that the gas in container 1 has lower energy and less movement than the gas in container 3.

Container 2 has a large number of collisions with container walls, but it also has a small number of particles with little spaces between them. While the collisions may be frequent, the limited number of particles and the lack of space between them may result in lower overall kinetic energy compared to container 3.

Container 4 has few collisions with container walls, low average kinetic energy, and a small number of particles. These properties indicate that the gas in container 4 has the lowest energy and least movement among all the containers.

Container 3

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The rainwater sample has a pH of 4.35, indicating that it is acidic. The concentration of \(H_3O^+\) ions in the sample is \(4.47 * 10^{-5} M\), which is higher than in neutral or basic solutions.

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Two ways that the density can be used in a factor label method is given below:

The Factor-Label Method also known as the the Unit Factor Method is a problem-solving method that uses the fact that any number or expression can be multiplied by one without changing its value.

This process is known as Dimensional analysis.

Density is defined as the ration of mass and volume.

Density = mass/volume

Two ways that the density can be used in a factor label method is given below:

In conclusion, density of a substance is the ratio of mass and volume.

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Answer:

4C2H5NH2(g) + 15O2(g) →  8CO2(g) + 14H2O(g) + 2N2(g)

Explanation:

The balanced chemical equation  for the given chemical reaction is 4 C₂H₅NH₂(g) + 15 O₂(g) →  8 CO₂(g) + 14 H₂O(g) + 2 N₂(g).

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

A)He, Ne, and Ar

Explanation:

I believe its this one. Sorry if its wrong. Remember that 8 electrons are in the outermost energy level .

Titration is a technique for determining unknown molarity of acid by adding a base of know malarkey to a known volume of acid

The process of calculating the quantity of a material A by adding measured increments of substance B, the titrant, with which it reacts until exact chemical equivalency is obtained " is the definition of titration. Titration, commonly referred to as titrimetry, is a method of chemical qualitative analysis used to determine the concentration of a certain analyte in a mixture.

The goal of titration is to identify the equivalence point, or the point at which chemically equivalent amounts of the reactants have been combined, which is a key analytical chemistry technique also known as volumetric analysis. The stoichiometry of the reactants determines how many reactants have been mixed at the equivalence point.

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hey there!

atomic mass cobalt = 58.9332 amu

therefore:

1 mol Co ------------ 58.9332 g

moles ------------ 50 g

moles = 50 x 1 / 58.9332

moles  = 50 / 58.9332

 = 0.8484 moles of Co

Hope this helps!

0.8484 moles are in 50 grams of cobalt.

A mole is defined as 6.02214076 × \(10^{23}\) of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Atomic mass cobalt = 58.9332 amu

Therefore:

1 mol Co ------------ 58.9332 g

moles ------------ 50 g

moles = 50 x 1 ÷ 58.9332

moles  = 50 ÷ 58.9332

= 0.8484 moles of Co

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Answer:

H2SO4 AND NH3

Explanation:

I hope it will help you

Answer:

Explanation:

H2SO4 AND NH3

Answer:

Molarity

Explanation:

The conversion of g/mol to g/L molarity can be used. Thus, option C is correct.

The g/mol has been the amount of solute present in a mole. The g/mol has been the molecular weight of the compound.

The g/L has been the mass of solute present in a L of solution. The g/L has  the unit for density.

Molarity has been the moles of solute present in the liter of solution. It has been given as mol/L.

The product of g/mol and g/L gives the value of mol/L. Thus, to convert g/mol to g/L molarity can be used. Thus, option C is correct.

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Effective nuclear charge decreases down a group and increases from left to the right across a period.

Effective nuclear charge decreases down a group because as you go down a group, there are more shells of electrons. This means that the distance between the nucleus and the outermost electron orbital increases; thus the attraction of the valence electrons to the nucleus decreases down a group.

Effective nuclear charge increases from left to right across a period because although electron shielding remains constant, the number of protons in the nucleus remains constant. This means that the nucleus has a greater positive charge, and thus there is a greater attraction between the electrons in the electron cloud and the nucleus (since opposite charges attract).

Answer:48

Explanation:

Answer:  3. 0.125 X 10”23 molecules

Explanation:

The chemical formula for the molecule you provided is C2H5Cl.

In the molecule, the central atom is carbon (C), which is bonded to two hydrogen atoms (H) and one chlorine atom (Cl). The carbon atom forms single bonds with each of the hydrogen and chlorine atoms, resulting in a linear structure.

To write the chemical formula, we start by indicating the number of atoms of each element present in the molecule. In this case, there are two carbon atoms (C2), five hydrogen atoms (H5), and one chlorine atom (Cl1).

Next, we write the symbols for the elements in the order of their appearance. The formula is typically written with the carbon atom first, followed by hydrogen, and then any other elements in alphabetical order. Therefore, the chemical formula for the molecule is C2H5Cl.

The subscripts in the formula indicate the number of atoms of each element in the molecule. In this case, there are two carbon atoms, five hydrogen atoms, and one chlorine atom.

It's important to note that the formula represents the simplest ratio of atoms in the molecule. It does not provide information about the spatial arrangement or bonding pattern of the atoms. Additional structural information, such as the arrangement of atoms in space, would require a more detailed representation, such as a Lewis structure or a three-dimensional model.

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Answer:

adding more water to the container

Explanation: because it would cause it to soak up the fluid to created a substance again

Answer:

adding more water to the container and iflamates the cells

Explanation:

The total number of the electron pairs are eight electron pairs.

We know that the structure of a compound can be determined by the number of the electron pairs that are found on the valence shell of the central atom of the compound.

We know that the central atom must be the atom that is least electronegative. Given that there are four valence electrons of carbon which is the central atom in the compound, we have eight electron pairs  in the molecule. Thus the total number of valence electrons present is sixteen

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Answer: i also need help on the same question :(

Explanation: