Which material, principle, or process enables a method of numerical dating?

answer: radioactivity

Electron configurations for the elements follow 3 principles , Aufbau principle, Pauli Exclusion Principle and Hund's Rule of Multiplicity

What is Aufbau principle ?

It states that electrons fill lower-energy atomic orbitals before filling higher-energy ones.

The order in which the orbitals are filled with electrons are:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p

Element with electronic configuration of atomic number:

  a.  7 is Nitrogen :  1s2 2s2 2p3 or   [He] 2s2 2p3

  b.  9 is Fluorine :   1s2 2s2 2p5 or [He] 2s2 2p5

  c.  12 is Magnesium : 1s2 2s2 2p6 3s2 or [Ne] 3s2

  d. 36 is Krypton : 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 or [Ar] 4s2 3d10 4p6

Thus we can conclude that electron configurations for the elements follow 3 principles , Aufbau principle, Pauli Exclusion Principle and Hund's Rule of Multiplicity

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The no. of moles of [tex]CH_4[/tex] remaining after the reaction is found to be 11.5 moles.

The no. of moles of a material equals the ratio of its given mass to the mass of one mole of that molecule in a chemical reaction.

The coefficients reflect the number of moles, not simply molecules, that react.

Stoichiometric coefficients are the numbers that come before the chemical formula of a molecule participating in a reaction. They assist us in determining the relative amounts or no. of moles of each reactant consumed and product created during a reaction.

[tex]CH_4 (g) + 2O_2 (g) \rightarrow CO_2 (g) + 2H_2O (g)[/tex]

No. of moles of [tex]CH_4[/tex] = 13.0 mol

No. of moles of [tex]O_2[/tex] = 3.0 mol

Here [tex]O_2[/tex] is limiting reagent because moles of [tex]O_2[/tex] is less.

Thus, [tex]CH_4[/tex] is in excess

1 mol [tex]CH_4[/tex] = 2 mol [tex]O_2[/tex]

x mol [tex]CH_4[/tex] = 3 mol [tex]O_2[/tex]

Moles of [tex]CH_4[/tex] used = 3 x 1 / 2 = 1.5 mol

Here we have 13 moles of [tex]CH_4[/tex],

Therefore,

No. of moles of [tex]CH_4[/tex] left = 13 - 1.5 = 11.5

Result:

11.5 moles of [tex]CH_4[/tex] will remain after the reaction.

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The amount of CO₂ formed is 44g.

The chemical reaction occurs is C+O₂=CO₂.

We know that 1mol of carbon and 2 oxygen reacts together to form 1mol of CO₂.

According to law of conservation of mass the total mass of the products formed in chemical reaction must be equal to the mass of reactants consumed.

So, the amount of CO₂ produced is 1mol of CO₂ is 44g, which is equal to it’s molecular weight.

According to the law of conservation of mass, mass is neither generated nor destroyed during a chemical process. For instance, when coal is burned, the carbon atom in it transforms into carbon dioxide. The carbon atom transforms from a solid to a gas, yet its mass remains constant.

CO₂ gas has no color or smell. The gas is not combustible. It has a mild toxicity. Denser than air, it. It is soluble in water, and as temperature rises, solubility decreases.

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The relative contribution of CO2 attributed to global warming is 60 % in the environment.

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The ability of an electric charge or heat to move through a material is measured by its conductivity. A material is considered a conductor if it offers relatively minimal resistance to the flow of thermal or electric energy.

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0.0351mol/L is the equilibrium constant, Kc of the given chemical reaction.

The value of a chemical reaction's reaction quotient at chemical equilibrium, a condition that a dynamic chemical system approaches when enough time has passed and at which its composition has no discernible tendency to change further, is the equilibrium constant for that reaction.

Given:

Initial no. of moles of NOCl = 2.5 moles

NOCl dissociated = 28%

total volume = 1.5 L

To find:

Equilibrium constant, Kc = ?

Formula:

Kc = [products] / [reactants]

Calculations:

(28/100) x 2.5 = 0.7 moles

[tex]2NOCl (g) \leftrightarrow 2NO (g) + Cl_2 (g)[/tex]

According to the above equation,

2 moles of NOCl will give 1 mole of [tex]Cl_2[/tex] and 2 moles of NO

Therefore, no. of moles of NO = 0.7 mol

No. of moles of [tex]Cl_2[/tex] = 0.35 mol

No. of moles of NOCl remaining after dissociation = 2.5 - 0.7 =1.8 mol

Molarity = no. of moles / volume

Therefore, Molarity of NO = 0.7 / 1.5 = 0.466M

Molarity of [tex]Cl_2[/tex] = 0.35 / 1.5 = 0.233M

Molarity of NOCl = 1.8 / 1.5 = 1.2M

Kc = [tex]([NO]^2 [Cl_2]) / [NOCL]^2[/tex]

Kc = [tex][(0.466)^2 (0.233)] / (1.2)^2[/tex]

Kc = 0.0351mol/L

Result:

The equilibrium constant, Kc of the given chemical reaction is found to be 0.0351mol/L.

The complete question is:

A 2.50 mol quantity of NOCl was initially in a 1.50L reaction chamber at 400℃. After equilibrium was established it was found that 28.0% of NOCl had dissociated.

[tex]2NOCl (g) \leftrightarrow 2NO (g) + Cl_2 (g)[/tex]

Calculate equilibrium constant Kc for the reaction.

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The element that have been described in the question above is Strontium.

The term first ionization energy refers to the energy that is required in order to remove the first electron from the valance shell of an atom. We know that the first ionization energy of an atom depends on some factors such as the proximity of the outermost shell to the nucleus of atom.

As such, the element that is being discussed here is the strontium atom. It has  a lower first ionization energy than calcium and  a smaller atomic radius than barium.

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A 1 kg ball is thrown from a height of 3 m.Without considering air resistance. The height it reaches after it bounces off the ground is only 2 metres.The change in momentum of the before and after the bounce is -1.407 kgm/s.

This can be calculated as, 

Change in momentum = m ( vf-mvi)

29.4 = 1/2mvi2

vf = 7.668m/s

19.6J = 1/2vf

2vf = 6.261m/s

Change in momentum = m(vf-vi) 

= 1kg x (-1.407m/s)

 = -1.407 kgm/s

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If we are to express the pressure of the gas in kilopaschal then we have  303.9 kPa

We define the pressure of the gas as the force with which the gas is able to bump or hit or collide against the walls of the container in which the gas has been stored. In this case, we have been given the pressure of the gas but the unit in which the volume have been given is the unit of the atmosphere and we are asked by the question to express the pressure in the unit of kilopascal.

We know that from the use of the conversion factors;

1 atm = 101.3 kPa

3 atm = 3 atm * 101.3 kPa/ 1 atm

= 303.9 kPa

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The volume of the solution of NaOH required is obtained as 400 mL.

The term titration has to do with the procedure by which an acid reacts with a base to give salt and water only. The process of titration is a volumetric process.

We can see that the reaction shows that  2 moles NaOH reacts with 1 mole of the acid.

Number of moles of  acid= 2.0 mol/L x 0.1 L = 0.2 moles

Number of moles of base required = 2 x 0.2 = 0.4 moles

Number of moles of NaOH that we need = (x L)(1.0 mol/L) = 0.4 moles

Volume of NaOH that we need =  0.4 L or 400 mL

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Missing parts;

How many ml of 1.0 M NaOH solution are needed to neutralize 100 ml of 2.0 M H2SO4 solution

The total reactive power absorbed by the line is: 120-J 160 VA

Given that, a load of 30 - j 40 is connected to a source of 100 v with a phase angle of 30o , through a transmission line with an inductive reactance of 80 ohms.

[tex]current, $I=I_L=\frac{100 \angle 30^{\circ}}{30-j 40+j 80}=\frac{100 \angle 30^{\circ}}{30+j 40}$[/tex]

[tex]$=2 \angle-23.13^{\circ}$[/tex]

[tex]$\begin{aligned} V_L &=\left(100\left(30^{\circ}\right)-I(j 80)\right.\\ &=\left(100 < 30^{\circ}\right)-(2 L-23.13)(j 80) \\ &=100 L-76.26 \text { volts. } \end{aligned}$[/tex]

[tex]$\begin{aligned} \text { Power delivered toads }=& V_l I_L^* \\=&(100 < -76.26)(2 L-23.13)^* . \\=&(100 < -76.26)(1.839-j 0.786)^* \\ &=(100 < -76.26)(1.839+j 0.786) \\ &=(100 < -76.26)(2 L+23.13) \\ S &=120-j 160 \mathrm{VA} \end{aligned}$[/tex]

The component of complex power known as reactive power pertains to energy storage and retrieval rather than consumption. Real power, which really does work, and reactive power, which permits transformers to change, generators to produce, and motors to rotate, are the two types of power found in an AC power system.

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The energy levels present in argon, aluminum and chlorine is 3 , with two electrons on the first energy level , 8 in the second level and third level have 8 electrons of argon.

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The specific heat is 0.00892181.

The specific heat capacity of a substance is the amount of heat required to raise the temperature of a unit amount of the substance by 1 degree. At the specific heat Cp of the substance, we name the amount of heat supplied Q that causes a temperature change for the weight W of the substance. Specific heat capacity is the amount of heat required to raise the temperature of 1 kg of a substance by 1 Kelvin.

Specific Heat Capacity C or S  The amount of heat required to raise the temperature of a substance by 1 degree Celsius is called the specific heat capacity of the substance. Heat is often measured in joules J. The mass of the sample is denoted by m. The amount of heat is represented by Q. Heat is expressed in J or Joules. T is the temperature of the substance.

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Among the observations, the mass, which is 3.8 g, describes an extensive property of the material.

Physical properties of a material can be classified as either intensive property or extensive property.

Intensive properties of a material are the properties that do not change no matter how much amount the material changes. On the other hand, extensive properties of a material are the properties that change as the amount of material changes.

Among the given observations, color, texture, and density are all intensive properties. If the unknown sample is increased, these properties will not change.

But when the sample is increased or reduced, the mass will change. Hence, the only extensive property among the observations is the mass.

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ANSWER

Water molecule is a compound

EXPLANATION;

Water molecule is formed from the combination of oxygen and hydrogen atoms

Recall, that compound is the combination of two or more elements that are chemically combined together

Therefore, water molecule is a compound

Moving across the period the elements gain a proton and gain a valence electron.

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After one half life, the number of years needed for 1/4 of the cobalt-60 to remain after decay is computed as follows.

After another half life, only 1/4 of the original mass isotope is left; consequently, if one half life is 5.3 years, the number of years needed is 2 x 5.3 years, or 10.6 years.

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The empirical formula of mesitylene is C₃H₄.

To solve this problem, we need to determine the molar ratio of carbon and hydrogen in mesitylene. We can do this by first calculating the masses of carbon and hydrogen in the sample. Because all the carbon in mesitylene is transformed into carbon dioxide, the mass of carbon in CO₂ will be equal to the mass of carbon in the mesitylene. All we need is the molar mass of carbon dioxide: 44 g/mol

12 g of carbon : 44 g of carbon dioxide = X : 0.379 g of carbon dioxide

X = 12 g of carbon * 0.379 of carbon dioxide / 44 g of carbon dioxide

X = 0.103 g of carbon

Because mesitylene is composed of just carbon and hydrogen, we can determine the mass of hydrogen by subtracting the mass of carbon from the mass of mesitylene:

0.115 g - 0.103 g = 0.012 g of hydrogen

Now we divide these masses by the molar masses of the elements:

0.103 g / 12 g/mol =0.009 mol of carbon

0.012 g / 1 g/mol = 0.012 mol of hydrogen

We divide the moles by the smaller of the two numbers to get the molar ratio:

0.009 mol / 0.009 mol = 1 for carbon

0.012 mol / 0.009 mol = 1.33 for hydrogen

Because we need the molar ratio to be in integers, we multiply both values by 3:

1 * 3 = 3 for carbon

1.33 * 3 = 4 for hydrogen

This means that the empirical formula of mesitylene is C₃H₄.

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The intermolecular forces in HF, [tex]CCl_4[/tex] and [tex]CH_3Cl[/tex] molecules are hydrogen bonding, dispersion forces and dipole-dipole interactions respectively.

Intermolecular forces, such as the electromagnetic forces of attraction or repulsion that act between atoms in a molecule and other kinds of nearby particles, such as atoms or ions, mediate interactions between molecules.

The attractive forces that occur between molecules are known as intermolecular forces. They control a number of bulk characteristics, including the solubilities (miscibilities) of compounds and their melting and boiling temperatures.

Intermolecular forces may be divided into four categories: hydrogen bonding, London dispersion forces, ion-dipole, and dipole-dipole.

HF has a hydrogen bond, also known as an H-bond, is an electrically charged attraction between an electronegative atom containing a single pair of electrons, known as the hydrogen bond acceptor, and a hydrogen (H) atom that is covalently attached to a more electronegative "donor" atom or group.

[tex]CCl_4[/tex] has London dispersion forces which is the least powerful intermolecular force. When the electrons in two nearby atoms hold positions that cause the atoms to temporarily form dipoles, the consequence is the London dispersion force, a transient attractive attraction.

[tex]CH_3Cl[/tex] has dipole-dipole interactions where molecules having permanent dipoles are drawn to one another electrostatically; for example, the positive end of one molecule will attract the negative end of another, and so forth, eventually causing the molecules to align.

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Answer: Protons and Electrons

Explanation:

Atoms are made up of 3 subatomic particles.

Protons (Positive Charge)

Electrons (Negative Charge)

Neutrons (Neutral Charge)

The number of protons must be equal to that of electrons in order for the overall charge to be neutral.

Answer

0.113 M

Explanation

Given that:

The volume of the stock solution, V₁ = 50.0 mL

The concentration of the stock solution, C₁ = 1.74 M

The volume of the solution the chemist made, V₂ = 770.0 mL

What to find:

The concentration (C₂) of the BaCl₂ solution the chemist made.

Step-by-step solution:

The concentration (C₂) of the chemist's working solution can be calculated using the dilution formula below:

Hence, the concentration of the chemist's working solution is 0.113 M.

Equation B. PEa = KEc + PEc best describes the energy at point C, assuming energy is conserved.

As we are provided,

Three particular points A,B and C are described.

The point A is the point at the top, the point B is the point at the bottom and point C is the point somewhere in the middles when merry is swinging.

According to law of conservation of energy,

The sum of total energy is conserved at every point of the motion.

As point A is the highest point. The body will come at momentary rest. The whole of energy will be stored as the potential energy of the girl.

At point B, the swing will have maximum velocity and the whole energy will be found in the form of kinetic energy.

At point C, the total energy will be a sum of potential plus kinetic energy.

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The image shows Mary happily swinging in the park. There are tree positions shown in the image: A, B, and C. PositionB is located at the very bottom of the swing arc and has the lowest height. Which of the following equations best describes the energy at point C, assuming energy is conserved?

A. PEa= KEc

B. PEa= KEc + PEc

C. PEg= KEc + PEc

D. PEg = PEc

Answer: To me i think it’s “A” because one of the geological processes is

hydrothermal process which I think is also cooling down

Answer:tells you the identity of the atom

Explanation:

number of protons=atomic number

Answer: C

Explanation: The answer would be C, it tells you the identity of the atom.

Pioneer 11 launched and touched down one year later. It travelled there in 606 days, flying by Jupiter at a considerably closer distance (21,000 kilometres), and also stopped by Saturn.

Pioneer 11 was the second spacecraft in early human exploration of the outer solar system and the first mission to investigate Saturn. Instruments were carried by the spacecraft to investigate magnetic fields, the solar wind, and the atmospheres, moons, and other features of Jupiter and Saturn.

The gravity of Jupiter assisted Pioneer 11 as it rocketed toward Saturn. The spaceship had to travel nearly five years to reach the planet, which was 930 million miles away from Earth.

When the final message from the spacecraft was received on September 30, 1995, the Pioneer 11 Mission came to a conclusion. Since then, Pioneer 11 has not been in contact.

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Answer:

Sulfur has the most neutrons (it has 4).

Answer:

Explanation:

Here, we want to get the mass required to make the given volume

To get this we need to get the number of moles

To get the number of moles, we have to multiply the volume by the molarity

Mathematically, we have that as:

The volume can be converted to liters by dividing by 1000

So we have the volume as 311/1000 = 0.311 L

Thus, we have the number of moles as:

To get the mass, we have to multiply the number of moles by the molar mass

The molar mass of NaCl is 58.44 g/mol

Thus, we have the mass as: