Helium atoms do not combine to form he2 molecules, yet he atoms do attract one another weakly through.

The quantities needed to boil water that initially starts in the liquid state below the boiling point are the mass of the water, the initial temperature of the water, and the specific heat capacity of water.

The energy needed to boil water is specific heat capacity. Specific heat capacity is the amount of heat energy required to rise 1 degree of one kilogram of substance. The formula

Q = m × c × ΔT

ΔT = T - T₀

where

The boiling point of water is 100 °C, so we needed to know the mass of water, the initial temperature of the water, and the specific heat capacity of water to calculate the amount of heat energy needed to boil water.

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The reaction Ca(s)  + 1/2O₂(g) ⇒CaO(s)  in which ΔH⁰rxn value equal to the ΔH⁰f value for cao(s).

In above reaction

calcium and oxygen react to form calcium oxide. In this reaction one mole of calcium oxide solid formed so the enthalpy change during this is reaction is considered as enthalpy of formation.

The enthalpy change that takes place when 1 mole of a substance is created from its component elements in their standard states is known as the standard enthalpy of formation.

Hence, one mole of cao is formed from a constituent atom from their elemental state is the enthalpy of formation.

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The temperature, at which it occupies 15.0 litres at the same pressure is,  269°C.

A temperature is a unit used to represent hotness or coolness on any of a number of scales, including Fahrenheit and Celsius. According to temperature, heat energy will naturally move from a hotter (body with a higher temperature) to a colder (body with a lower temperature) (one at a lower temperature).

The definition of pressure is "force applied per unit area." It can be calculated mathematically using P=FA, where F is the force acting perpendicular to surface area A. The pascal (Pa), or one newton per square meter (N/m²), is the common unit of pressure.

Calculations:

At the same pressure,

volume is directly proportional to temperature.

i.e., V ∝ T

⇒V₁/V₂ = T₁/T₂

here, V₁ = 5.5 litres , T₁ = 25°C = 298K

V₂ = 10 litres, T₂ = ?

now, 5.5/10 = 298/T₂

⇒T₂ = 298 × 10/5.5 ≈ 542 K

Temperature in degree Celsius = 542 - 273 = 269°C

Hence, the temperature, at which it occupies 15.0 litres at the same pressure is,  269°C.

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C₃H₆ is the molecular formula of the compound.

It is given that the empirical formula for a certain compound is CH₂. In addition to that, the moles of the hydrocarbon is 0.125 moles and combustion gave 8.4 L of CO₂ in STP. To find the molecular formula for the unknown compound, first, we need to balance the reaction, of the combustion

3CH₂ + 3O₂ ------> 2CO₂+ 2H₂O

The number of moles of CO₂ is given as follows

= 8.4/22.4

= 0.375 moles of CO₂

The next step is to convert the moles of CO₂ to CH₂ using the ratio in the balanced equation. By doing so we get,

0.375 moles of CO₂/1 x (2moles of CH₂/2moles of CO₂)

= 0.375 moles of CH₂.

The molecular formula of any compound a multiple of the empirical formula. By dividing the empirical moles by the molecular moles we get, the molecular formula of the compound.

= 0.375/0.125

= 3

By multiplying this value with the empirical formula we get C₃H₆. This is the molecular formula of the given compound

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Kinds of intermolecular forces are present in a mixture of ethanol (CH3CH2OH) and water are dispersion intermolecular forces

Ethanol or ethyl alcohol is a colorless, volatile, and flammable liquid that soluble in water. Its chemical formula is C2H6O or C2H5OH or CH3CH2OH.

Intermolecular forces that mediate interaction between molecules, including attraction forces or repulsion attraction that act between molecules and other types of neighboring particles such as atoms or ions. There are three major types of intermolecular forces: London dispersion force, dipole-dipole interaction, and ion-dipole interaction

London dispersion forces is the force that hold molecules together in the liquid, solid and solution phases are quite weak. London dispersion force is the weakest of the intermolecular forces. It is the force between two nonpolar molecules

Dipole -dipole interactions between two polar molecules occurred when the partial charges formed within one molecule attracted to an opposite partial charge in a nearby molecule.

The ion-dipole interaction is occurred when an ion encounters a polar molecule.

Hydrogen Bonding is the attraction between two atoms that already participate in other chemical bonds.

Therefore, CH3CH2OH have H-bond intermolecular forces and dipole intermolecular forces and dispersion intermolecular forces. There's no ionic interaction because we don't have metal attached to a nonmetal. For the mixture of ethanol (CH3CH2OH ) and water, it can very easily become a homogeneous mixture because the two liquids are miscible and soluble in all proportions.

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At 333K temperature 0.760 moles of oxygen gas occupy 8.00 L and exert 2.60 atm of pressure.

What is ideal gas law?

The relationship between a gas's pressure P, volume V, and temperature T in the range of low pressures and high temperatures, when the gas's molecules move virtually independently of one another, is known as the ideal gas law, also known as the perfect gas law.

Given:

Number of mole (n) = 0.760 mole

Volume of oxygen (V) = 8.00 L

Pressure (P) = 2.60 atm

Temperature (T) =.?

We know, Gas constant (R) = 0.0821 atm.L/Kmol

Using the ideal gas equation we get:

PV = nRT

2.6 x 8 = 0.76 x 0.0821 x T

So,

T = (2.6 x 8) /(0.76 x 0.0821 )

T = 333 K.

Hence, the temperature is 333 K.

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The theoretical yield of acetylsalicylic acid from 2.01 g of salicylic acid assuming excess acetic anhydride is 0.002.

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1. The equation is not balanced. The balanced equation is [tex]4NH_3 + 5O_2 --- > 4NO +6 H_2O[/tex]

2. The equation is balanced.

3. The equation is not balanced. The balanced version is [tex]2H_2O --- > 2H_2 + O_2[/tex]

A balanced chemical equation usually has the same number of atoms of different elements in the reactants and the products, even though the forms of the atoms might have changed.

Consider the first equation: [tex]NH_3 + O_2 --- > NO + H_2O[/tex]

The number of hydrogen atoms is not balanced. Thus, the equation that shows balanced atoms of different elements would be: [tex]4NH_3 + 5O_2 --- > 4NO +6 H_2O[/tex]

Consider the second equation: [tex]N_2 + 3H_2 -- > 2NH_3[/tex]

There are 2 atoms of nitrogen in the reactants and there are also 2 in the product. The number of hydrogen atoms is 6 in the reactants and 6 in the products. Thus, it is a balanced equation.

Consider the third equation: [tex]2H_2O --- > H_2 + O_2[/tex]

There are 4 hydrogen atoms in the reactant and only 2 in the products. The balanced equation would be: [tex]2H_2O --- > 2H_2 + O_2[/tex]

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the groups of electrons around carbon atom b in propene is bonding.

They are not nonbinding because bond formation involves all four valence e. They are bonding because they have all formed a bond. Because this C is sp2 hybridised, the electron geometry of the carbon atom B in propene is trigonal planar. Because propene's overall geometry is trigonal planar, the C-C-C bond angle is 120°. Nonbonding electrons are assigned to the atom they are located on. Non-bonding electron pairs are those on an individual atom that are not shared with another atom.Bonding electrons are distributed equally among the bonded atoms. Bonding electron pairs are electrons that are shared by the central atom and any atom to which it is bonded.

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If there are two moles of electrons transferred per mole of the metal, 191.1g/mol will be the molar mass of the metal.

Since formula for faraday's law of electrons is,

Since m = 0.1427g,

          L=144.2

           = 144.2 *(1A/1000mA)

           = 0.1442,

         t = 16min39

           = 16min*(60/1min)          

           = 999 second

        Z = 2e-mol

by substituting all the values in  faraday's law of electrons formula,

0.1427 g = (0.1442*999*M*1/96485*2)

molar mass M = (0.1427g*96485*2/0.1442*999*1)

                    M = 191.1538 g/mol = 191.1g/mol

Therefore molar mass of metal will be 191.1g/mol.

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Temperature at midnight would be -12 degrees Fahrenheit and is determined using the equation that represents this situation i.e., T/3 = -4.

In mathematics, an equation is a representation of a formula or statement that illustrated an equality relationship of two expressions. The expressions are connected with an equals sign. Solving an equation containing variables involves calculating values of the variables that make the equality true. The variables for which the equation has to be solved are also called unknowns, and the values of the unknowns that satisfy the equality are called solutions of the equation.

Based on the information provided, as the temperature at 9am is -4 and it is the 1/3 of the temperature at midnight T, the equation would be:

1/3* Midnight temperature = 9am temperature

1/3*T = -4 or T/3 = -4

Solving the equation,

T = 3*-4 = -12.

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The compound (A) is 2-bromo-pentane. See attached picture for the chemical diagram.

2-bromo-pentane (A) reacts with bromine (Br₂) under UV light to form 2,2-dibromopentane and HBr. Also When 2-bromo-pentane (A) reacts with NaSH to from pentane-2-thiol, which have an asymmetric carbon, and NaBr.

Sufficient images are given below ;

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When 65.0g of is burned with enough oxygen, theoretical calculations are amplified by 100%. Divide the reaction's actual yield by its potential value to get the percent yield. The theoretical yield is equal to 100 times the actual yield.

This is the reaction's theoretical yield, or what you would get if it yield 100%. In your situation, it is known that the reaction will generate a percentage of 75%. This basically means that you only receive 75 moles of carbon dioxide for every 100 moles that the reaction may theoretically yield.

Improvements to the % yield for chemical production need a lot of time and money. One reaction with a low percent yield can easily result in a significant waste of reactants and excessive expense when complex compounds are synthesized through a number of distinct reactions. The formula percent yield = actual yield/theoretical yield x 100 is used to calculate yield percentage.

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When pentanol reacts with tscl and pyridine it yields 1-pentene and 2- pentene. The alcohol involved is secondary.

Pentanol (C₅H₁₁OH) reacts with thionyl chloride (TSCA) to form pent-2-chloride (C₅H₉Cl). This reaction is an example of a nucleophilic substitution reaction, in which the hydroxyl group of the alcohol is replaced by a chlorine atom.

The pent-2-chloride then reacts with pyridine and sodium methoxide (NaOCH₃). Pyridine is a strong base, so it acts as a nucleophile and attacks the carbon-chlorine bond of the pent-2-chloride, forming a pent-2-yl cation. The sodium methoxide then acts as a nucleophile, displacing the chlorine atom from the cation to form pent-2-ene. This is an example of an SN2 reaction, in which the nucleophile attacks the carbon atom bearing the leaving group.

Overall, the reaction of pentanol with TSCI and pyridine along with sodium methoxide is a two-step process. The first step involves the substitution of the hydroxyl group with a chlorine atom, and the second step involves the displacement of the chlorine atom with a methoxide ion. Therefore,

1) The alcohol involved is secondary.

2) The reactant is pentanol

3) The product is pent-2-ene

4) In the below-attached image, all the reactions are shown clearly.

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potassium carbonate is not soluble, chromium is soluble in water, iodide iron soluble in ether alcohol and ammonia and nitrate is soluble in water.

With the chemical formula K2CO3, potassium carbonate is an inorganic substance. It is a white salt that may be dissolved in water. It is effervescent and frequently manifests as a wet or soggy solid. Glass and soap manufacture are the two main industries that utilise potassium carbonate. For the creation of glass and soap, potassium carbonate is frequently utilised.

Common nitrate ingredients in explosives and fertilisers. Water is a solvent for almost all inorganic nitrates. Bismuth oxynitrate is one type of insoluble nitrate. Similar to NO, nitrate has physiological effects on the body in a variety of systemic activities, such as lowering blood pressure, preventing platelet aggregation, and protecting blood vessels [3, 37].

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(C5H11) n-Pentyl is the major product of 4 carbon chain with a double bond between C1 and 2. there is a methyl(CH3) substituent on C 2. the alkene (C5H10) reacts with HCL .

The IUPAC name of the given reactant in the statement is  CYCLOPENTANE.

As per the given statement:

The starting is a 4 carbon chain with a double bond between C1 and 2. there is a methyl(CH3) substituent on C 2. the alkene (C5H10) reacts with HCL to give the product

Hence,

C5H10 +HCL → C5H11 +Cl2

hence,(C5H11) n-Pentyl is the major product of C5H10 +HCL → C5H11 +Cl2.

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Answer:

2.15 L

Explanation:

We can use the combined gas law to answer this:

P1V1/T1 = P2V2/T2

where P, V, and T are the Pressure, Volume, and Temperature (in Kelvin) for the initial (1) and final (2) states.  We may assume the pressure remains the same between both states (1 atmosphere. or standard pressure).  Ci=onvert the Celcius temperatures into Kelvin by add 273.15 to the C value.

We want the original volume, V1.  Rearrange the equation to solve for V1:

   V1 = V2(P2/P1)(T1/T2)

Note how the pressure and temperature variables are formatted:  as ratios.  This allows us to more easily visualize how the changes in both will impact the value of V1.  A rise in temperature between T1 and T2 would mean that the ratio (T1/T2) would be less than 1, so the initial volume, V1, would be smaller than the final volume, V2.  The raio of the pressures P2/P1 simply reduces to 1, since they are the same.  So even before we get our a calculator, we can predict that V1 will be smaller than V2.  

Enter the data:  V1 = (2.75L)*(1)*(273.15K/350K)

The pressure and temperature units cancel, leaving only voulume (Liters).

  V1 = 2.15L

This is less than 2.75L, which is what we already expected.  The initial volume is 2.15 L.

In 2.6*10² ms, a sample of radon-218 will deteriorate from 99 grams to 0.50 grams. The half-life of radon-218 is 35 milliseconds.

The only significant, carbon-free energy resource that the nation can extensively expand to produce significant amounts of power is nuclear energy. When fossil fuels are burned to produce the same number of electricity, nuclear power plants avoid producing a sizable amount of emissions. One of the best instances of nuclear fusion seems to be the sun. Helium is created when hydrogen nuclei combine inside the sun, producing thermal energy which warms the Earth..

t = 2.303/R log A₀/A

Hence, R = 0.693/t/2

t = 2.303/0.693*35 log 99/0.5

t = 267ms

= 2.6*10² ms

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NH4+(aq) and Cl−(aq)  are a conjugate acid-base pair.

The above statement is true.

What is a conjugate acid-base pair?

A conjugate acid-base pair consists of two molecules or ions that differ by one proton. The molecule or ion that has lost a proton is the conjugate base, while the molecule or ion that has gained a proton is the conjugate acid. The conjugate acid-base pair shares the same base, but has different numbers of hydrogen atoms.

What is a Chemical reaction?

A chemical reaction is a process in which one or more substances are changed into one or more new substances with different properties. Chemical reactions involve the breaking and forming of chemical bonds, and release or absorb energy in the form of heat, light, or sound.

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The ratio of product to reactants is Equilibrium constant.

What is equilibrium constant?

The equilibrium constant is the ratio of products to reactants at equilibrium. It is denoted by K

Fora given reaction:

Reactants ⇌ Products

When the forward and reverse responses occur at the same pace, their effects cancel out. At this stage, a process is said to be in chemical equilibrium.

For above reaction,

Ratio of product to reactants or equilibrium constant, is given by:

K = [tex]\frac{products}{reactants}[/tex]

Why should the rate of forward and reverse reaction become equal in equilibrium?

If the rate of forward reaction exceeds the rate of backward reaction, reactants are being converted into products. The forward reaction is preferable. The quantity of reactants is decreasing while the quantity of products is increasing. As a result, it is not in equilibrium.

When the rate of backward reaction exceeds the rate of forward reaction, products become reactants. The reverse reaction is preferred. The quantity of reactants is increasing while the quantity of products is decreasing. As a result, it is not in equilibrium.

There should be no change in the quantities of reactants or products at equilibrium, creating the impression that nothing is happening. Forward and backward reflexes must have the same rate to meet this criteria.

The ratio of product to reactants is Equilibrium constant.

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The nucleophile has to attack from: A nucleophilic attack often occurs when an electron-rich species (the nucleophile) "attacks" an electron-deficient species (the electrophile, usually a carbocation), forming a new bond between the nucleophile and the carbocation.

Nucleophile (Nuc): A reactant that offers a couple of electrons to form a brand-new covalent bond (i.e. a Lewis base). A nucleophile that shares an electron pair with a proton is generally known as a Bronsted-Lowry base or just a base. Hydroxide ion as a nucleophile in an SN2 reaction.

In chemistry, a nucleophile is a chemical species that paperwork bonds by using donating an electron pair. All molecules and ions with a free pair of electrons or at least one pi bond can act as nucleophiles. due to the fact nucleophiles donate electrons, they're Lewis bases.

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Number of moles of gas are in the tank is  0.287 mole.

Pressure is the force implemented perpendicular to the floor of an object in step with unit location over which that force is shipped. Gauge strain is the strain relative to the ambient strain. diverse units are used to specific strain.

Strain is described as force implemented consistent with unit area. Mathematically it's far given by, P=FA. wherein F is the force acting perpendicular to the floor vicinity A. the usual unit of strain is the pascal (Pa), equal to at least one newton in keeping with meter squared (N/m 2 ).

Calculation:-

volume =  433 L

Pressure =  1.24 atm

T = -48 °c

  = 273 - 48 K

  = 225 K

PV = nRT

n = PV/RT

   = 1.24 × 433 / 8.314 × 225 K

   = 0.287 mole

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The name of the element is Gallium and the symbol is Ga.

Solution:

Abundance of second isotope = (100 - 60.11) = 39.89 %

Atomic mass of element = 68.9255 * (60.11 / 100) + 70.9247 * (39.89 / 100) = 69.72 AMU

The atomic mass of an element is 69.72 AMU which is matched with the atomic mass of gallium.

so,

The name of the element is Gallium and the symbol is Ga.

The atomic mass of an element is the weighted average of the atomic masses of the naturally occurring isotopes of that element. Atomic mass calculations use the abundance ratios of each isotope. Isotopes are members of a family of elements that all have the same number of protons and different numbers of neutrons.

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A piece of dry ice, which is solid CO2, vanishes after some time at normal temperature. There is no liquid puddle. The CO2 gas solidified.

Carbon dioxide freezes into a substance called dry ice. Carbon dioxide travels directly from a gas to a solid rather than first becoming a liquid and then a solid. As a result, whenever it melts, gas is created as well.

Typically, dry ice is utilized in industry for tasks like blasting, preserving frozen goods, and transporting drugs. In addition, dry ice is employed in our daily lives for a variety of other things, such as producing special effects for movies and events.

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the enthalpy change when 1.75 moles of diethyl ether changes from the liquid to the gas phase is ΔH= 47.775 KJ

What is enthalpy?

Enthalpy is an energy-like attribute or state function; it has the dimensions of energy (and so is measured in joules or ergs), and its value is controlled wholly by the system's temperature, pressure, and composition, rather than its history.

What is enthalpy with example?

This Enthalpy is equal to the sum of the internal energy of such a system with the constant. You must realise that the forms of energy fluctuate, while Enthalpy remains constant. For example, when water freezes into ice, some energy is used in the process, which is referred to as Enthalpy.

Here ΔH°vap for die ethyle ether = 27.3 KJ/mol

The enthalpy change when 1.75moles of die ethyle ether charges from the liquid to the gas phase will be,

ΔH = (27.3 × 1.75)KJ

ΔH= 47.775 KJ

Hence47.775 KJ is a correct answer.

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True , Energy is released during bond formation, whereas energy is required to break the bonds between the reactants.

Chemical bonds maintain the interconnectedness of molecules' atoms.. Positively charged subatomic particles and electrons with negative charge interact electrostatically to form bonds. A liquid forms gas bubbles when it reaches its boiling point, which rise to the surface and then burst into the air.

Chemical bonds are formed when the atoms in a compound's molecule are brought together and kept together by a powerful combining force. Ionic and covalent bonds are the two different types of chemical bonds.

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The five correct steps on oxidative decarboxylation of pyruvate are:

These steps are correct in the process of oxidative decarboxylation of pyruvate, because they describe the complete process of pyruvate decarboxylation, from the initial conversion of pyruvate to hydroxyethyl-TPP, to the transfer of the acetyl group to CoA, to the reoxidation of FADH2. This sequence of steps ensures that the energy from the oxidation of pyruvate is captured and stored as energy-rich molecules, such as NADH and acetyl-CoA.

Is a type of metabolic reaction in which a carboxylic acid is converted into an aldehyde, alcohol, or ketone by the addition of an oxidizing agent, such as oxygen or a metal compound.

This reaction involves the removal of a carboxyl group (COOH) and the addition of an oxygen atom (O). The resulting product contains either an aldehyde, alcohol, or ketone group, depending on the starting material.

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We have a large mass thus our associated wavelength is small for humans.

We know that the wavelength has to do with the distance that is covered by a  wave. This would normally refers to the horizontal distance. According to the wave particle duality theory that was put forward  by the man Louis  DeBroglie, he said that when matter is in motion, it must have an associated wavelength.

We know from the theory that;

λ = h/p

λ = wavelength of the object

h = Plank's constant

p = momentum of the objects.

We have to note that the momentum is the product of the mass and the velocity of the object.

We now know that as the mass of the object increases, the velocity becomes infinitesimal and may not be felt.

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