what would the molarity of the dichromate in the volumetric flash before it reactswith the fe (ii) in thesample?

Answer:

the average atomic mass for element X is 28

Answer:

I hope I can help you

I hope I can help you

Answer:

2Na2S + Cd(NO3)2 ---> CdS + 2NaNO3

The coefficients therefore are 1,1,1&2

Answer:

gold

Explanation:

a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Answer:

The reason why phosphorus usually forms 3 bonds is because of its valence electrons. Phosphorus has 5 valence electrons and due to the octet rule, it will strive to gain 3 more in order to fill it outer shell and become stable. PH3 and PCI3 are great examples of this. In the compound PH₃, The phosphorus atom is in a covalent bond to three hydrogen atoms. Each of the three hydrogen atoms share their one valence electrons with phosphorus, and the phosphorus atoms shares one electron with each hydrogen atom. In the compound PCl₃, one phosphorus atom shares one electron with each chlorine atom, and each chlorine atom shares one electron with phosphorus. Note that each of these compounds are covalent bonds. As show, phosphorus forms 3 bonds because it needs 3 more electrons to become stable.

Let the amount of the 36% alcohol solution be x liters, and the amount of the 20% alcohol solution be y liters. We want to create a 40L mixture with 30% alcohol. We can set up the following system of equations. x + y = 40 total volume of the mixtures 0.36x + 0.20y = 0.30 * 40 total alcohol content.

The Now we can solve the system of equations step by step Solve equation 1 for x or y. I'll solve for x: x = 40 - y Substitute the result from step 1 into equation 20. 36(40 - y) + 0.20y = 0.30 * 40 Simplify the equation 14.4 - 0.36y + 0.20y = 12 Combine like terms and solve for y -0.16y = -2.4 y = 15 Substitute the value of y back into the equation for x  = 40 - 15 x = 25 So, you need to mix 25 liters of the 36% alcohol antifreeze solution and 15 liters of the 20% alcohol antifreeze solution to make 40 liters of a 30% alcohol antifreeze solution.

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Answer:

Mg(OH)₂ ​+  2HCI → MgCI₂ ​+ 2 H₂ ​O

Explanation:

but heres a way to solve it

An athlete takes a deep breath, inhaling 1.85 L of air at 21°C and 754 mm Hg.

T

How many moles of air are in the breath? How many molecules?

Gas constant, R= 8.314 J mol ¹ K-1

PV = nRT

PV

RT

h=

=

P

= 0.08206 L atm mol-1 K-1

= 62.36 L Torr mol-1 K-1 -

1 atm = 760 mm Hg = 760 Torr

754 Forr 1.85€

6236 Jerr 294K

Answer:

Explanation:

Tough question.

The answer is very dependent on the temperature of the water. At 0o C, less than 5 grams is soluble in water.

The curve increases as the temperature increases. At 80oC about 35 grams  is soluble in water 100 mL of water.  So Ba(OH)2 is very soluble at higher temperatures.

Maybe the question can be resolved just a little better at room temperature. The solubility is still less than 5 grams / 100 mL. That makes it slightly soluble or more soluble than other things.

So to answer the question, you need to specify the temperature. I would say it is, but be prepared to defend your answer.

The \(4.61*10^{26\) Ar atoms organ atoms are contained in 7.66×10³ of an organ.

7.66*10^5m mole = 766 moles

1 mole of Ar atom contains 6.022*10^23 Ar atoms.

766 mole of Ar atom contains 6.022*10^23*766 Ar atoms

= 4612.85*10^23 Ar atom

= 4.61*10^26 Ar atoms

Atoms are the fundamental building blocks of matter. They are the smallest units of an element that retain the chemical properties of that element. Atoms are composed of a nucleus, which contains positively charged protons and neutral neutrons, and negatively charged electrons that orbit around the nucleus in shells or energy levels.

The number of protons in an atom's nucleus determines its atomic number and thus its identity as a particular element. Atoms can form chemical bonds with other atoms through sharing, gaining, or losing electrons, leading to the creation of molecules and compounds.

Atoms exist in a wide variety of forms, each with its own unique properties and characteristics. The study of atoms and their behavior is known as atomic physics, and it has important applications in fields such as chemistry, materials science, and engineering.

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Answer:

Frequency = 6.16 ×10¹⁴ Hz

λ = 4.87×10² nm

Explanation:

In case of hydrogen atom energy associated with nth state is,

En =  -13.6/n²

For n = 2

E₂ = -13.6 / 2²

E₂ = -13.6/4

E₂ = -3.4 ev

Kinetic energy of electron = -E₂ = 3.4 ev

For n = 4

E₄ = -13.6 / 4²

E₄ = -13.6/16

E₄ = -0.85 ev

Kinetic energy of electron = -E₄ = 0.85 ev

Wavelength of radiation emitted:

E = hc/λ = E₄ - E₂

hc/λ = E₄ - E₂

by putting values,

6.63×10⁻³⁴Js × 3×10⁸m/s / λ = -0.85ev   - (-3.4ev )

6.63×10⁻³⁴ Js× 3×10⁸m/s / λ = 2.55 ev

λ = 6.63×10⁻³⁴ Js× 3×10⁸m/s  /2.55ev

λ = 6.63×10⁻³⁴ Js× 3×10⁸m/s  /2.55× 1.6×10⁻¹⁹ J

λ = 19.89 ×10⁻²⁶ Jm / 2.55× 1.6×10⁻¹⁹ J

λ = 19.89 ×10⁻²⁶ Jm / 4.08×10⁻¹⁹ J

λ = 4.87×10⁻⁷ m

m to nm:

4.87×10⁻⁷ m ×10⁹nm/1 m

4.87×10² nm

Frequency:

Frequency = speed of electron / wavelength

by putting values,

Frequency = 3×10⁸m/s /4.87×10⁻⁷ m

Frequency = 6.16 ×10¹⁴ s⁻¹

s⁻¹ = Hz

Frequency = 6.16 ×10¹⁴ Hz

The diffusion of carbon in iron occurs through an interstitial mechanism which happens in bcc iron from one tetrahedral site to another.

The carbon atoms diffuse through the iron lattice and are located in the interstitial sites within the lattice.

This interstitial mechanism is observed to happen in the Body centered cubic (BCC) structure of iron, and the carbon atoms fill the tetrahedral voids of the bcc iron lattice.

Interstitial diffusion of carbon in BCC iron involves the movement of a carbon atom from one tetrahedral site to another.  

The interstitial diffusion of carbon in iron is responsible for the hardening of steel via heat treatment, which makes the steel stronger and more durable.

This property is used in the manufacturing of steel tools and machinery components that are expected to endure high stress.

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The specific heat of the metal is approximately 0.454 J/g°C.To determine the specific heat of the metal, we can use the principle of energy conservation.

The heat gained by the water in the calorimeter is equal to the heat lost by the metal sample.First, let's calculate the heat gained by the water:

q_water = m_water * c_water * ΔT_water

where:

m_water = mass of water = 14.86 g

c_water = specific heat capacity of water = 4.18 J/g°C (rounded to two decimal places)

ΔT_water = change in temperature of water = 52.3°C - 50.0°C = 2.3°C

q_water = 14.86 g * 4.18 J/g°C * 2.3°C = 178.20 J

Since the heat lost by the metal is equal to the heat gained by the water, we have:

q_metal = q_water

Next, let's calculate the heat lost by the metal:

q_metal = m_metal * c_metal * ΔT_metal

where:

m_metal = mass of the metal sample = 191.6 g

ΔT_metal = change in temperature of the metal = 78.7°C - final temperature of the water

To find the specific heat capacity of the metal (c_metal), we rearrange the equation:

c_metal = q_metal / (m_metal * ΔT_metal)

Plugging in the known values:

c_metal = 178.20 J / (191.6 g * (78.7°C - 52.3°C))

c_metal ≈ 0.454 J/g°C

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The disadvantage of increasing our use of solar energy is that unfortunately currently, the production and storage of solar energy is bit as cost efficient when compared to obtaining the same quantity of energy from fossil fuels.



After three half lives, radioactive substance go from 100% to 50% to 25% to 12.5%. Thus, it would decrease from 16 to 8 to 4 to 2 g.

Half-life means after a certain  amount of time, the half of that substance will be gone/changed after that time are

So, we divide the 16g sample in half 3 times.

16 ÷ 2 = 8

8 ÷ 2 = 4

4 ÷ 2 = 2g

To determine how the half-life and decay constant relate to one another, use the formula N=N0et. (a) A substance's half-life is the amount of time it takes for its concentration to drop to half of its starting value.

Half of the original parent nuclei are still present after one half-life; after two half-lives, only 25% are. The half-life and the initial quantity of radioactive atoms present both influence the radiation from a source's intensity.

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The standard enthalpy of reaction for a system in which increasing the temperature by 15 K reduces the equilibrium constant by half, relative to its value at 310 K is -0.956 kJ/mol.

Given: ΔT = 15 K and ∆K/K = 1/2

Temperature is directly proportional to equilibrium constant K,

So, ∆T/T = ∆K/K

This can be written as ∆K/K = ΔH°/R × (1/T2 − 1/T1)

On solving this equation, we getΔH° = −2.303 × R × ΔK/K × T2T2 = 310 + 15 = 325 K∆K/K = 1/2∆H° = −2.303 × 8.314 J mol−1 K−1 × 1/2 × 325 K∆H° = −955.7 J mol−1= −0.956 kJ/mol

Therefore, the standard enthalpy of reaction for a system in which increasing the temperature by 15 K reduces the equilibrium constant by half, relative to its value at 310 K is -0.956 kJ/mol.

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The orbital filling and electron configuration are based on various principles. The Aufbau principle states that electrons fill the orbital from lowest to highest energy levels. Thus, option A is correct.

The Aufbau principle is the rule that states about the filling of the electron in the various orbitals of an atom. It defines the filling of the lower atomic orbitals before the higher levels are filled.

This principle allows for determining the electronic configuration of the atom. The rule states that the electron first occupies the lowest energetically unrestricted orbits that can hold a certain number of electrons. The electron can only move to a higher level when the electron is filled in the previous subshell.

Therefore, option A. the Aufbau principle gave the filling of electrons in the lowest energy level.

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The sample of pure carbon would contain approximately 2.135 x 10²⁴ carbon atoms.

The majority of carbon atoms—98.93%—have masses of 12 atomic mass units. A mass of 13.00 atomic mass units is present in 1.07% of the carbon atoms. 14.) Identify one distinction between the nuclei of carbon-12 and carbon-13 atoms in terms of the subatomic particles that can be discovered there.

First, using the atomic mass of carbon, we must determine how many moles of carbon are present in the sample:

1 mole of carbon atoms = 12.01 g of carbon atoms (atomic mass of carbon)

42.552 g of carbon atoms / 12.01 g/mol = 3.545 moles of carbon atoms

Using Avogadro's number, we can then determine how many carbon atoms are present in the sample:

Number of carbon atoms = 3.545 moles of carbon atoms x 6.022 x 10²³ atoms/mole

Number of carbon atoms = 2.135 x 10²⁴ atoms

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Answer:

Melting

Explanation:

Once heat is added it will turn to a liquid

Melting is the process of turning solid to liquid.

Answer:

option 4 - it can have different compositions, and it has a set of characteristics that change.

Mixture is defined to have different compositions, and it has a set of characteristics that does change.There are 2 types of mixtures:1) homogenous mixtures 2)heterogenous mixtures

Heterogenous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.

As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.

Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.

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Sulfur (S) and oxygen (O) are both elements in Group 16 (formerly Group VI A) of the periodic table. This group is often referred to as the oxygen group or chalcogens. Oxygen is highly electronegative, meaning it has a strong tendency to attract electrons towards itself when it forms chemical bonds.

Water molecules are highly polar due to the significant electronegativity difference between oxygen and hydrogen. The oxygen atom in water pulls electrons towards itself, creating a partial negative charge (δ-) on the oxygen and partial positive charges (δ+) on the hydrogen atoms. This polarity allows water molecules to form hydrogen bonds with each other, resulting in strong intermolecular forces.

The stronger intermolecular forces in water due to hydrogen bonding result in higher boiling and melting points compared to hydrogen sulfide. Water is a universal solvent due to its high polarity and ability to form hydrogen bonds. Many substances dissolve well in water. Hydrogen sulfide, although less polar and with weaker intermolecular forces, is still somewhat soluble in water, resulting in a weak acid known as hydrosulfuric acid.

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The correct depiction of the particles A and B as shown in the table is; particle A is present in 3d orbitals, and Particle B is packed in the nucleus.

The term subatomic particle refers to a particle that is found inside the atoms recall that the Dalton theory initially opined that the atom is indivisible. This was however overturned by the discovery of the existence of the subatomic particles.

Now we know that there are three fundamental subatomic particles and these are;

The electron is negative and it can be found in the shells and is arranged in orbitals in the nucleus. The proton and the neutron are both found in the nucleus.

The orbital refers to the region in space where there is a high probability of finding the electron. Now we know that the electrons are arranged in the orbitals of the atom in order of increasing energy.

It the follows that, the correct depiction of the particles A and B as shown in the table is; particle A is present in 3d orbitals, and Particle B is packed in the nucleus.

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Explanation:

In a normal heart, there is a balance between calcium and potassium ion levels in both the outer and inner walls of the heart. That balance keeps electrical energy flowing correctly through the heart, and allows the heart muscle to expand and contract as the heart beats.10-Nov-2005

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All of the terms mentioned, namely vapor pressure lowering, boiling-point elevation, freezing-point depression, and osmotic pressure, are related to the concept of colligative properties.

Colligative properties are physical properties of a solution that depend only on the number of solute particles present, regardless of their identity or properties. Vapor pressure lowering refers to the decrease in the vapor pressure of a solvent due to the presence of a non-volatile solute. Boiling-point elevation refers to the increase in the boiling point of a solvent due to the presence of a solute. Freezing-point depression refers to the decrease in the freezing point of a solvent due to the presence of a solute. Osmotic pressure refers to the pressure required to prevent the flow of solvent through a semipermeable membrane, caused by the difference in concentration of solute particles on either side of the membrane.

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Answer:

As trees grow, they help stop climate change by removing carbon dioxide from the air, storing carbon in the trees and soil, and releasing oxygen into the atmosphere. Trees provide many benefits to us, every day.

Answer:

B

Explanation:

BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB

Ba(OH)2 has one barium (Ba) atom, two hydroxide (OH) groups, and one oxygen (O) atom. So, the total number of atoms in one molecule of Ba(OH)2 would be:

1 Ba atom + 2 O atoms + 2 H atoms = 5 atoms

To find the number of molecules of Ba(OH)2 from 4.81*10^25 total atoms, we can use the Avogadro's number which states that 1 mole of any substance contains 6.022 x 10^23 particles. So,

1 mole Ba(OH)2 = 5 x 6.022 x 10^23 molecules Ba(OH)2

To find the number of moles of Ba(OH)2, we can divide the total number of atoms by the number of atoms in one molecule:

4.81 x 10^25 atoms / 5 atoms/molecule = 9.62 x 10^24 molecules of Ba(OH)2

Therefore, 9.62 x 10^24 molecules of Ba(OH)2 would be made from 4.81*10^25 total atoms.

Answer:

hi I dont see princess or sara but have a good day!

Answer:

Hola chica

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