a raidiosotope of radon-222 has a half life of 3.8 days, how much of a 10g sample of r-222 would be left after 15.2 days

Answer:

a one rotation of the planet on its axis

Explanation:

The two types of motion that planets undergo are;

1) rotation of the planet about its axis

2) revolution of the planet around the sun.

In every planet there are days as shown in the image attached to the question. However, the length of day in each planet is determined by the time required for the planet to complete one rotation on its axis.

It takes the earth 1 earth day (24 hours) to complete rotation on its axis.

The United States governmental agency that has primary responsibility for security issues in air transportation is the Transportation Security Administration (TSA).

The Transportation Security Administration (TSA) is a U.S. government agency that was created in response to the 9/11 attacks. Its primary responsibility is to ensure the security of air travel, both for passengers and cargo. The TSA is responsible for implementing and enforcing security measures at airports across the country.

This includes screening passengers and their belongings, conducting random checks, and employing various technologies to detect and prevent potential threats.

The agency also works closely with other domestic and international entities to share intelligence and coordinate security efforts. Overall, the TSA plays a crucial role in maintaining the safety and security of air transportation within the United States.

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The oxidation number of Na in the compound Na2CO3 is +1.

To determine the oxidation number of Na in Na2CO3, we need to consider the known oxidation numbers of other elements and the overall charge of the compound.

1. The compound Na2CO3 contains two Na atoms and one C atom, along with three O atoms.

2. Oxygen (O) typically has an oxidation number of -2, unless it is in a peroxide where it is -1.

3. Carbon (C) is more electronegative than hydrogen (H) but less electronegative than oxygen (O), so it usually has an oxidation number of +4 in compounds.

4. The compound Na2CO3 has a neutral charge, which means the sum of the oxidation numbers of all the elements must be zero.

5. Let's assign the oxidation number of Na as x. Since there are two Na atoms, the total oxidation number contribution from Na is 2x.

6. The oxidation number of C in CO3 is +4, and the oxidation number of O is -2. Since there are three O atoms in CO3, the total oxidation number contribution from O is 3*(-2) = -6.

7. Setting up the equation: 2x + 4 + (-6) = 0.

8. Solving the equation: 2x - 2 = 0, 2x = 2, x = 1.

Therefore, the oxidation number of Na in Na2CO3 is +1.

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i) Las bacterias son organismos microscópicos unicelulares que prosperan en diversos entornos. Estos organismos pueden vivir en el suelo, el océano y dentro del intestino humano.

ii) Un virus es un agente infeccioso submicroscópico que se replica solo dentro de las células vivas de un organismo. Los virus infectan todas las formas de vida, desde animales y plantas hasta microorganismos, incluidas bacterias y arqueas.

Considering the Dalton's partial pressure, the partial pressure of nitrogen and oxygen is 3.634 atm and 0.966 atm  respectively.

The pressure exerted by a particular gas in a mixture is known as its partial pressure.

So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

\(P_{T} =P_{1} +P_{2} +...+P_{n}\)

where n is the amount of gases.

Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture.

The mole fraction is a dimensionless quantity that expresses the ratio of the number of moles of a component to the number of moles of all the components present:

\(x_{A} =\frac{n_{A} }{n_{total} }\)

So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:

\(P_{A} =x_{A} P_{T}\)

In this case, the mixture contains 5.4 mol of nitrogen and 1.4 mol of oxygen. So, the total number of moles of all the components present is 5.4 moles + 1.4 moles=  6.8 moles.

Then, the mole fraction of each gas can be calculated as:

So, being 4.6 atm the total pressure of the gas mixture, the partial pressure of each gas can be calculated as:

\(P_{nitrogen} =x_{nitrogen} P_{T}\)= 0.79× 4.6 atm= 3.634 atm

\(P_{oxygen} =x_{oxygen} P_{T}\)= 0.21× 4.6 atm= 0.966 atm

In summary, the partial pressure of nitrogen and oxygen is 3.634 atm and 0.966 atm  respectively.

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Both sand and potting soil are mixtures because they both contains more than one type of substances. Both are composed of minerals and different substrates.

Mixtures are substance formed by the combination of two or more components. The mixtures can be homogenous or heterogenous. Homogenous mixtures contains only one phase.

Heterogenous mixtures are of components with different phases. Sand is an example of heterogenous mixture. The major component of sand is silicon dioxide. it also contains grains of other minerals.

Potting soil is a mix of soil and minerals used for plantation. It also known as potting compost since it contains wood products, vermiculates, clay etc. Therefore, potting soil is a mixture.

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Answer:

a solid has definite volume and shape, a liquid has definite volume but no definite shape, and a gas has neither a definite volume nor shape the change from solid to liquid usually does not significantly change the volume of a substance

Part A: The final pressure of the gas, when the volume and temperature are changed to 1600 mL and 320 K respectively, is approximately 4.57 atm.

Part B: The final pressure of the gas, when the volume and temperature are changed to 2.50 L and 12 K respectively, is approximately 0.19 atm.

To solve this problem, we can use the combined gas law, which states:

(P1 * V1) / (T1) = (P2 * V2) / (T2)

Where:

P1 = Initial pressure

V1 = Initial volume

T1 = Initial temperature

P2 = Final pressure (what we want to find)

V2 = Final volume

T2 = Final temperature

Let's solve each part of the problem:

Part A:

Given:

Initial volume (V1) = 6.50 L

Initial pressure (P1) = 845 mmHg (we'll convert it to atmospheres later)

Initial temperature (T1) = 25°C = 25 + 273.15 = 298.15 K

Final volume (V2) = 1600 mL = 1600/1000 = 1.6 L

Final temperature (T2) = 320 K

Now let's plug these values into the combined gas law equation:

(P1 * V1) / T1 = (P2 * V2) / T2

(P2 * 1.6) / 320 = (845 * 6.50) / 298.15

P2 = (845 * 6.50 * 320) / (1.6 * 298.15)

P2 ≈ 3477.59 mmHg

To convert the pressure to atmospheres, we divide by the conversion factor of 760 mmHg/1 atm:

P2 (in atmospheres) = 3477.59 mmHg / 760 mmHg/atm

P2 ≈ 4.57 atm

So the final pressure of the gas, when the volume and temperature are changed to 1600 mL and 320 K respectively, is approximately 4.57 atm.

Part B:

Given:

Initial volume (V1) = 6.50 L

Initial pressure (P1) = 845 mmHg (we'll convert it to atmospheres later)

Initial temperature (T1) = 25°C = 25 + 273.15 = 298.15 K

Final volume (V2) = 2.50 L

Final temperature (T2) = 12 K

Using the same combined gas law equation:

(P1 * V1) / T1 = (P2 * V2) / T2

(P2 * 2.50) / 12 = (845 * 6.50) / 298.15

P2 = (845 * 6.50 * 2.50) / (12 * 298.15)

P2 ≈ 144.41 mmHg

Converting to atmospheres:

P2 (in atmospheres) = 144.41 mmHg / 760 mmHg/atm

P2 ≈ 0.19 atm

Therefore, the final pressure of the gas, when the volume and temperature are changed to 2.50 L and 12 K respectively, is approximately 0.19 atm.

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An atom of titanium has 22 protons and 26 neutrons. If the atoms loses one electron, then the charge on the ion that forms is +1. Thus option A is correct.

Protons are defined as a positively charged particles which are present in the nucleus of an atom.

Number of protons in an element nucleus is called atomic number.

Neutrons are defined as a neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen.

When an atom loses electrons it gain positive charge and become cation. When an atom gain electrons it gain negative ions and become anion.

Thus, an atom of titanium has 22 protons and 26 neutrons. If the atoms loses one electron, then the charge on the ion that forms is +1. Thus option A is correct.

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The characteristic of fiber molecules are:

Molecules are the fundamental units that makeup matter. They are composed of two or more atoms chemically bonded together. Atoms combine to form molecules through the sharing or transfer of electrons, creating stable arrangements known as chemical compounds. Molecules can be as simple as two atoms, such as in the case of oxygen (\(O_2\)) or nitrogen (N2), or they can be complex structures containing thousands or even millions of atoms, such as proteins or DNA.

Molecules exhibit various properties and behaviors based on their composition and structure. They can interact with other molecules through chemical reactions, forming new compounds or breaking down into simpler substances. The study of molecules, known as molecular chemistry, is crucial in understanding the behavior of matter, as it provides insights into the properties, structures, and transformations of substances.

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Common sources of the pollutant are factories. The control techniques for each of the six pollutants.

People can be exposed to dangerous air pollutant that pose health risks in a variety of ways, including ingesting contaminated air. consuming contaminated foods, such as tainted meat, milk, or eggs, contaminated produce grown in polluted soil where air toxics have been deposited, and infected fruits and vegetables. contaminated water from dangerous air pollution, Consuming poisonous soil. Young children are especially vulnerable since they regularly put objects in their mouths or absorb soil from their hands. Exposing your skin to contaminated dirt, dust, or water (for example, during recreational use of contaminated water bodies). The two primary categories of pollution sources are point sources and nonpoint sources. Point sources—small, distinguishable sources of pollution—include factories, mines, power plants, refineries, and wastewater treatment facilities. Nonpoint sources are those that are distributed over a wide geographic area, such a watershed. Nonpoint sources can also include mobility sources like cars, buses, and trains. While each of these are single point sources, their total effects are spread across a vast area because they are all moving.

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I think that you should use your phone

The compound X that have a Molecular molar mass of 138 g/mol is

Given here,

Compound x - 6g

malar mass of x - 138g/mol

Carbon dioxide - 13.39 g

water - 2.35g

So,

The moles of Water will be 0.13 mol

The moles of Hydrogen will be 0.26

Mass of hydrogen = 0.26 g

The moles of  CO2  will be 0.304

The moles of carbon will be 0.304

Mass of Carbon = 3.65 g

Mass of  Oxygen = Total mass of the compound - (mass of C + mass of H)

= 6.0 g - ( 3.65 + 0.262 ) g

= 2.09 g

Moles of oxygen = 0.131

Since Oxygen has the least moles, to find the molar ratio of the constituent atom, divide the moles of an atom from oxygen.

C = 0.304/0.131 = 2.8

C = 0.26/0.131 = 2

C = 0.131/0.131 = 1

convert 2.3 into a whole number

C = 2.3*3 = 7

H = 2*3 = 6

O = 1*3 = 3

Hence formula will be C7H6O3

What is molar mass?

The molar mass of a chemical compound is determined in chemistry by dividing the mass of a sample of that compound by the quantity of that compound, which is the number of moles in that sample, measured in moles. The molar mass of a substance is a bulk attribute rather than a molecular one. The compound's molar mass is an average over numerous samples, which frequently have different masses because of isotopes. A terrestrial average and a function of the relative abundance of the isotopes of the constituent atoms on Earth, the molar mass is most frequently calculated using the standard atomic weights. For converting between a substance's mass and amount in bulk amounts, the molar mass is the proper unit.

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The volume of the solution is 562.9 mL.

To find the volume of the solution, we need to use the formula:

concentration (molarity) = moles/volume (in liters)

We are given the concentration of the solution, which is 0.175 M. We can use this to find the number of moles of barium chloride in the solution:

0.175 M = moles / volume (in liters)

moles = concentration x volume (in liters)

We don't know the volume of the solution yet, but we can find the number of moles of barium chloride by rearranging the formula:

moles = concentration x volume (in liters)

volume (in liters) = moles / concentration

To find the moles of barium chloride, we first need to convert the mass given to moles using the molar mass of barium chloride. The molar mass of BaCl₂ is:

Ba: 137.33 g/mol

Cl₂: 2 x 35.45 g/mol =70.90 g/mol

Total: 137.33 + 70.90 = 208.23 g/mol

So, the number of moles of barium chloride is:

moles = 20.5 g / 208.23 g/mol

moles = 0.0986 mol

Now we can use the formula above to find the volume of the solution:

volume (in liters) = moles / concentration

volume (in liters) = 0.0986 mol / 0.175 M

volume (in liters) = 0.5629 L

Finally, we need to convert the volume to milliliters:

volume (in mL) = 0.5629 L x 1000 mL/L

volume (in mL) = 562.9 mL

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Explanation:

surface tension and heat of vaporization

Approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.

To determine the volume of 0.250 M NaOH required to neutralize 30.4 mL of 0.152 M HCl, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction between NaOH and HCl:

NaOH + HCl -> NaCl + H2O

From the balanced equation, we can see that the stoichiometric ratio between NaOH and HCl is 1:1. This means that for every mole of NaOH, we require an equal number of moles of HCl to neutralize.

First, let's calculate the number of moles of HCl present in the given volume:

Moles of HCl = concentration of HCl * volume of HCl

= 0.152 M * 30.4 mL

= 4.6208 mmol (millimoles)

Since the stoichiometric ratio is 1:1, the number of moles of NaOH required to neutralize the HCl is also 4.6208 mmol.

Now, let's calculate the volume of 0.250 M NaOH needed to contain 4.6208 mmol:

Volume of NaOH = (moles of NaOH) / (concentration of NaOH)

= 4.6208 mmol / 0.250 M

= 18.4832 mL

Therefore, approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.

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Solid, Heat of fusion, Liquid, Heat of vaporization, and Gas are the answers for the following questions represented by the graph.

At phase transition temperature is constant so BC & DE represent phase transition.

1)AB represents solid here \(C_{solid}\) constant use to calculate heat absorbed here.

2)BC represents melting solid here heat of fusion is constantly used to calculate heat absorbed here.

3)CD represents liquid here \(C_{liquid}\) constant use to calculate heat absorbed here.

4)DE represents Boiling liquid here Heat of vaporization is constant used to calculate heat absorbed here.

5)EF represents gas here \(C_{gas}\) constant used to calculate heat absorbed here.

An alteration in the state from one phase to another is known as a phase transition. A phase transition is identified by a sudden change in one or more physical attributes accompanied by a minute change in temperature.

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Answer:

4

Explanation:

it will share its valence electrons with other elements to acquire noble gas confriguration of the nearest inert element.

The arrow in a chemical equation indicates that the reaction is reversible. This means that the reactants can form products, but the products can also react to reform the reactants.

To determine if an equation is balanced, we need to check if there are an equal number of each type of atom on both sides of the equation. If the equation is balanced, the number of atoms on the reactant side is the same as the number of atoms on the product side.
The statement "there are the same number of hydrogen atoms (H) in the reactants as in the products" means that the coefficient in front of H on the reactant side should be the same as the coefficient in front of H on the product side.
The statement "C6H12O6 is a reactant" means that C6H12O6 is present on the reactant side of the equation.
The arrow in a chemical equation does not indicate that the reactants combine with the products. It simply shows the direction of the reaction.
Lastly, to determine if there are the same number of oxygen atoms (O) in the reactants as in the products, we need to check if the coefficients in front of O on both sides of the equation are equal.

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Answer:

Are you asking for all of them? Some of the basic ones are alluminum and carbon.

Answer:

Here, I hope this helps

Explanation:

Answer:

       ┃

        V

Explanation:

A polar molecule is a chemical species in which the distribution of electrons between the covalently bonded atoms is not even. Each atom has a certain electro-negativity. When bonded to another atom, the atom with the higher electro-negativity will tend to attract more electrons.

Answer:

 A system that we use daily or almost every day is, for example, when boiling water for cooking.

Explanation:

This is the case of an open system.

Boiling water in a pot without a lid, exchanges heat energy and mixes with its surroundings when it enters a gaseous state.

The energy introduced into the system by the fire transforms the water into gas, which is released back into the environment. Without that constant heat injection, the water will stop boiling; and without room to get out, the steam (matter) will increase the pressure until the pot burst.

You can find examples like these anywhere, knowing the definition of each system:

The amount of energy transferred by the TV in 1.5 seconds, given the power rating of 180 watts is 270 Joules

We know that power is defined as the rate at which energy is used up. Mathemaically, it can be expressed as:

Power = Energy / Time

With the above formula, we can determine the amount of energy transferred by the TV in 1.5 seconds. This is illustrated below:

Power = Energy / Time

180 watts = Energy transferred / 1.5 seconds

Cross multiply

Energy transferred = 180 watts × 1.5 seconds

Energy transferred = 270 Joules

Thus, we can conclude that the energy transferred by the TV is 270 Joules

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There 0.4414 moles of Al³⁺ ions are present in 329.4 ml of 1.34 M AlCl₃.

To calculate the moles of Al³⁺ ions we sholud first write the balance ionic reaction

The balanced ionic equation as follows:

   AlCl₃   →   Al³⁺ + 3Cl⁻

Then we should calculate the number of moles of AlCl₃

   number of moles = molarity x volume

   number of moles of AlCl₃ = 1.34 M × 0.3294 L

   number of moles of AlCl₃ = 0.4414 mol

It is evident from the balanced ionic equation that 1 mole of AlCl₃ will result in 1 moles of Al³⁺ ion.

To get how many moles of Cl there are, multiply the number of moles of AlCl3 by 1. so moles of Al³⁺ is 0.4414 mol

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Answer:

b no

Explanation:

6.5 g/cm³

Hi there !

density formula

d = m/V

1ml = 1cm³

= 26g/4cm³

= 6.5 g/cm³

Good luck !