Which statement is correct regarding the rate of the reaction below? 3A + B yields 4X + 2Y

Answer:

[tex]Keq =\frac{[H+]^{2} [SO4^{2-}]^{2}  }{[H2SO4]}[/tex]

Explanation:

The equilibrium constant K is a parameter that relates the concentration of products to that of the reactants at equilibrium and under a given temperature.

Consider a hypothetical reaction:

xA + yB ↔ zC

where A and B are the reactants ;  C is the product

x and y are the coefficients of the reactants; z is the product coefficient

The equilibrium constant is given as:

[tex]Keq = \frac{[C]^{z} }{[A]^{x}[B]^{y}}[/tex]

The given reaction is:

[tex]H2SO4(aq)\rightleftharpoons 2H+(aq)+ SO_{4}^{2-}(aq)[/tex]

[tex]Keq =\frac{[H+]^{2} [SO4^{2-}]^{2}}{[H2SO4]}[/tex]

Formation of Y and Z directly depends on initial amount of X present.

Further Explanation:

Le Chatelier’s principle:

This states that any change in pressure, temperature or concentration in any reaction that is present in equilibrium tends to shift equilibrium in such direction that reverses the effect of changed quantity in reaction.

Given reaction occurs as follows:

[tex]2\text{X(g)}\rightleftharpoons\text{Y(g)}+\text{Z(g)}[/tex]

According to this reaction, two moles of X decompose to form one mole of Y and one mole of Z.

Amounts of Y and Z formed during the given reaction depend on initial amount of X present. More the amount of X, higher will be formation of products Y and Z and vice-versa. So if amount of X is increased, equilibrium will tend to shift in direction that reverses this effect. This is done only by increased consumption of X that results in more formation of products. Therefore more amounts of Y and Z are formed if initial amount of X is increased and formation of Y and Z decreases if initial amount of X is decreased.

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Chemical Equilibrium

Keywords: Le Chatelier’s principle, equilibrium, shift, direction, X, Y, Z, 2X, pressure, temperature, concentration, consumption, increase, decrease, two moles, one mole.

Final answer:

The initial amount of gas x does not affect the equilibrium quantities at a constant temperature. The concentration of solid z is constant and it is omitted from the equilibrium expression, meaning only gaseous reactants y and products are considered. The equilibrium position is dependent on the partial pressures of the gases, set by the equilibrium constant for given temperature conditions.

Explanation:

When a generic gas x decomposes in a sealed glass jar to form gaseous y and solid z following the reversible reaction 2x(g) ⇌ y(g) + z(s), the initial amount of x(g) does not affect the equilibrium quantities. This is established by Le Chatelier’s Principle and the concept of equilibrium constants. In a heterogeneous equilibrium like this, where a solid is involved, the concentration of the solid remains constant and it is omitted from the equilibrium expression. Only the concentrations of the gaseous reactants and products are variable and are included in the expression.

The equilibrium composition in the gas phase at a constant temperature remains the same, regardless of the initial amount of x(g). This is because the solid z(s) does not appear in the equilibrium constant expression and does not have a concentration that changes. What really matters for the position of equilibrium is the ratio of the concentrations (partial pressures) of the gaseous reactants and products, something that is fixed by the equilibrium constant at a given temperature.

Moreover, the system’s response to a change in volume or pressure depends on the stoichiometry of the gaseous components according to their molar quantities. In a reaction where the total molar amounts of reactants and products are equal, a change in volume does not shift the equilibrium. If the molar amounts are different, a volume change will shift the equilibrium in a direction that accommodates the volume change. However, as the temperature is held constant in this scenario, volume changes are not being considered, simplifying the analysis of the system.

Answer:

The percentage is 50.7%

Explanation:

The formula of chromium (III) carbonate is (Cr₂(CO₃)₃)

Let us calculate the molar mass of (Cr₂(CO₃)₃)

molar mass of (Cr₂(CO₃)₃) =

2X atomic mass of Cr + 3X atomic mass of C + 9X atomic mass of O

molar mass of (Cr₂(CO₃)₃) = 2X 52 + 3X12 +9X16 = 284g/mol

As per the formula there are nine moles of oxygen in each mole of (Cr₂(CO₃)₃).

so we can say that

In 284g of (Cr₂(CO₃)₃) the mass of oxygen = 144g

so 1 g of (Cr₂(CO₃)₃) the mass of oxygen = [tex]\frac{144}{284}=0.507g[/tex]

Therefore

the mass of oxygen in 100g of(Cr₂(CO₃)₃) =0.507X100=50.7

Thus percentage of Oxygen in (Cr₂(CO₃)₃) =50.7%

Answer:

The correct answer is option A, that is, treating inherited diseases.

Explanation:

Genetic testing comprises testing the DNA, that is, the chemical database, which conducts instructions for the functions of the body. Investigation of genes can demonstrate modifications in the genes, which may lead to a disease or illness.  

If someone is exhibiting signs of a disease, which may be a result of genetic modifications, also known as mutated genes. Then in such cases, the examination of genes can show if one is exhibiting a suspected disorder. For example, genetic testing may be done to confirm a diagnosis of Huntington's disease or cystic fibrosis.  

Factor would you expect the reaction rate to increase at 25 C is [tex]1.8*10^{12}[/tex]

Suppose that a catalyst lowers the activation barrier of a reaction from 125 kj/mol to 57 kj/mol . Assume that the frequency factors for the catalyzed and uncatalyzed reactions are identical:  by what factor would you expect the reaction rate to increase at 25 C?

Catalysis is process of increasing the chemical reaction rate by adding a substance known as catalyst. Reaction rate is the speed at which a chemical reaction proceeds. Activation energy is the energy which must be provided to a chemical or nuclear system with potential reactants to result in chemical reaction, nuclear reaction, etc

The rates of reaction question in Kelvin [tex]25 C = 273 + 25 = 298 K[/tex]

The rate constants under catalysed and non‐catalysed conditions:

Catalysed: [tex]k_{cat} = A e^{\frac{-Ea(cat)}{RT} } = A e^{\frac{‐55000}{(8.314 x 298)}} = A e^{-22.2}[/tex]

Uncatalysed: [tex]k_{uncat} = A e^{\frac{-Ea(uncat)}{RT} } = A e^{\frac{‐125000}{8.314* 298} } = A e^{-50.4}[/tex]

Ratio of catalysed to uncatalysed reaction rates is

[tex]\frac{k_{cat}}{k_{uncat}} = \frac{Ae^{-22.2}}{Ae^{-50.4}}[/tex]

The A values are the same for both processes, therefore [tex]\frac{A}{A} = 1[/tex]

[tex]\frac{k_{cat}}{k_{uncat}} =\frac{e^_{-22.2}}{e^{-50.4}} = 1.8 * 10^{12}[/tex]

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The factor by which reaction rate is more in the presence of catalyst as compared to uncatalysed reaction is 1.8 × 10¹².

From the Arrhenius equation, we can calculate the effect of chnage in the activation energy as well as of temperature on the rate of the reaction.

Arrhenius equation will be represented as:

[tex]k = Ae^{-Ea/RT}[/tex], where

k = rate constant

A = frequency factor = 1 (given)

Ea = activation energy

R = universal gas constant = 8.314 J/ mol.K

T = temperature = 25 degree celsius = 298 K

Activation energy = 57 kJ/mol = 57000 J/mol

[tex]k1 = e^{-57000/8.314\times 298}[/tex] = [tex]e^{-22} \\[/tex]

Activation eneregy = 125 kJ/mol = 125000 J/mol

[tex]k2 = e^{-125000/8.314\times 298}[/tex] = [tex]e^{-50.4}[/tex]

Ratio of both the rates will be :

k1/k2 = [tex]e^{-22} \\[/tex] / [tex]e^{-50.4}[/tex] = 1.8 × 10¹²

Hence, the rate is 1.8 × 10¹² times more.

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Explanation:

A polar covalent bond is formed due to unequal sharing of electrons between the combining atoms.

For example, HCl is a polar covalent compound.

This is because of the difference in electronegativities of both hydrogen and chlorine, partial opposite charges tend to develop on the hydrogen and chlorine atoms.

Whereas [tex]CHCl_{3}[/tex] is a non-polar compound and when HCl is added to it then HCl being polar in nature is unable to dissolve.

On the other hand, water is a polar compound and when HCl is dissolved in it then it will dissociate into hydrogen and chlorine ions.

As electricity is the flow of ions or electrons. Therefore, HCl in water is able to conduct electricity because it dissociates into ions.

Therefore, we can conclude that HCl in water exists as [tex]H^{+}[/tex] and [tex]Cl^{-}[/tex] ions. And, HCl in [tex]CHCl_{3}[/tex] exists as HCl.

Answer:  [tex]Na_2S+CdSO_4\rightarrow Cd_2S+Na_2SO_4[/tex]

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

Double displacement reaction is one in which exchange of ions take place.

The balanced chemical reaction will be:

[tex]Na_2S+CdSO_4\rightarrow Cd_2S+Na_2SO_4[/tex]

Answer: This chemical reaction is defined as synthesis reaction.

Explanation:

Synthesis reaction is defined as the reaction in which two or more substances combine in their elemental state to produce a single compound.

The general chemical equation representing this reaction is:

[tex]A+B\rightarrow AB[/tex]

For the given chemical reaction:

[tex]2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)[/tex]

Hence, this chemical reaction is defined as synthesis reaction.

Final answer:

Coal is formed from plant matter, while oil and natural gas are derived from marine organisms. A turbine produces electricity by spinning its blades with energy from different sources, transferring this motion to a generator.

Explanation:

The correct statement that compares the formation of coal to the way natural gas and oil are formed is: Coal results from the compressed remains of plant matter. Both oil and natural gas are compressed remains of marine organisms. So the correct answer is B. Coal, oil, and natural gas are all fossil fuels, but they form from different types of organic matter and under varying conditions of heat and pressure.

Coal is typically found as coal seams within rock layers and is formed from ancient swamp vegetation, whereas oil and natural gas originated from microorganisms in prehistoric water bodies and are often found together due to their similar formation processes.

A turbine works to produce energy for electricity by harnessing energy from various sources, such as the wind, water flow, or steam generated from the combustion of fossil fuels, to spin its blades. This motion is transferred to a generator, which converts the kinetic energy into electrical energy. The correct answer that describes this process is A: Energy from sources such as wind or from burning fossil fuels is used to spin the blades of the turbine. The turbine then powers a generator which produces electricity.

Answer:

V_{solution}=0.355L

Explanation:

Hello,

Potassium bromide moles are computed as:

[tex]n_{KBr}=30.5gKBr*\frac{1molKBr}{119.9gKBr}=0.254gKBr[/tex]

Now, by recalling the molarity formula and solving for the volume, one obtains:

[tex]M=\frac{n_{KBr}}{V_{solution}} \\V_{solution}=\frac{n_{KBr}}{M}\\V_{solution}=\frac{0.254mol}{0.716mol/L}\\ V_{solution}=0.355L[/tex]

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The rate of the dihydrogen production is 0.0175 kg/sec for the given reaction.

The given reaction

[tex]\bold {CH_4 + H_2O \rightarrow CO + 3H_2}[/tex]

One mole of Methane is react with one mole of water to form 1 mole of CO and 3 moles of Hydrogen.

The rate of hydrogen production can be calculated from ideal gas law

[tex]\bold {pV = nRT}[/tex]

Where,

p- pressure = 0,86 atm · 101,325 kPa/atm = 87,14 kPa.

V- volume of methane =  159 L

T -  temperature= 294°C = 567 K.

R - gas constant = 8,314 J/K·mol.

n - number of moles = ?

Put the values in the formula, sole it for n,

[tex]\bold{n(CH₄) = \dfrac {pV} {RT}}\\\\\bold {n(CH₄) = \dfrac {87,14 kPa \times 159 L} {8,314 J/K.mol \times 567 K}.}\\\\\bold {n(CH₄) = 2,93 mol}[/tex]

Since, the molar ratio of methane to hydrogen is 3:1.

SO,

[tex]\bold {n(H_2) = 2,93 mol \times 3 }\\\\\bold {n (H_2) = 8,79 mol.}\\[/tex]

Hence, the mass of the dihydrogen produced,

[tex]\bold{ m(H_2) = 8.79 mol \times 2 g/mol.}\\\\\bold {m(H_2) = 17.58 g \times 0.001 kg/g}\\\\\bold {m(H_2) = 0.01758 kg}[/tex]

Therefore, the rate of the dihydrogen production is 0.0175 kg/sec for the given reaction.

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A combination of sand, salt, and water is an example of a heterogeneous mixture, where you can distinguish between the different components - the sand settles at the bottom, the water above it, and the salt dissolves in the water but can still be separated.

A combination of sand, salt, and water is an example of a heterogeneous mixture. This is because in a heterogeneous mixture, the individual components can be visibly distinguished. Sand, salt, and water are each physically distinct within the mixture. For instance, if you look closely at such a mixture in a clear glass, you would see the sand settling at the bottom, the water above it, and the salt would have dissolved in the water but could still be separated by means of evaporation.

This is different from a homogeneous mixture, where all the components are evenly distributed and cannot be visually distinguished, such as salt fully dissolved in water. It's also not a compound, where different elements are chemically combined and cannot be separated by physical methods. Nor is it a pure substance which consists of only one type of atom, element, or compound. Finally, it's not just a solid because it contains both solid (sand, salt) and liquid (water) states of matter.

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The concentration of chloride ions in a saturated lead solution can be calculated using the given solubility and the stoichiometry of the dissolution reaction. The concentration is determined to be 1.3 × 10-6 M.

The concentration of chloride ions in a saturated solution is determined by the solubility product constant, Ksp, and the solubility of the particular compound. Using the provided information, the concentration of chloride ions is given as [Cl] = 7.6 × 10-³ M initially. However, with further calculations by applying quadratic equation and taking into account the dissolution stoichiometry, it is found that the concentration of chloride ions in the solution is [Cl] = 1.3 × 10-6 M. The composition of chlorine in its isotopic form is also considered which consists of 75.76% 35Cl and 24.24% 37Cl. Hence, consider all these factors when calculating the concentration of ions in a solution.

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Taking into account the definition of avogadro's number, 7.59×10⁻¹¹ moles of copper are 4.57×10¹³ atoms of copper.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 6.023×10²³ atoms are contained in 1 mole of copper, then 4.57×10¹³ atoms are contained in how many moles of copper?

amount of moles of copper= (4.57×10¹³ atoms × 1 mole)÷ 6.023×10²³ atoms

amount of moles of copper= 7.59×10⁻¹¹ moles

Finally, 7.59×10⁻¹¹ moles of copper are 4.57×10¹³ atoms of copper.

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The most polar bond in acetic acid is [tex]\boxed{{\text{O - H bond}}}[/tex].

Further explanation:

Electronegativity:

The tendency of an atom to attract the shared electrons in the bond towards itself is known as electronegativity. The more electronegative atom will more attract the bonding electrons towards itself than the less electronegative one.

Higher the electronegativity value of the element more will be its tendency to accept an electron towards itself.

A polar bond is defined as a covalent bond between two atoms where the electrons that form the bond are unequally distributed. This is reason for the positive charge at one end and the negative charge at other end.

The bond or the molecular polarities are related to the electronegativity of the atoms or the molecules. The polarity of a bond is given by the difference in electronegativity between the two atoms that form polar bond

The factors on which the polarity of bonds depends are as follows:

1) Relative electronegativity of participating atoms:

Since the bond polarity involves pulling of electrons towards itself, hence a more electronegative element will be able to attract the electrons more towards it. As a result, the electrons will definitely move towards the more electronegative element.

2) The spatial arrangement of various bonds in the atom:

The shared pair of electrons also experience pulling force from the other bonded and non-bonded pair of electrons. This results in different bond polarities between same participating atoms that are present in different molecules. For example, bond polarity of O-H bond in a water molecule and acetic acid molecule is different. This is due to the different spatial arrangements of various bonds in the molecule.

Acetic acid also called as ethanoic acid is a colorless organic compound. It consists of methyl group that is bonded to carboxyl group.

The structure of acetic acid is attached in the image.

In acetic acid, two oxygen atoms are present in which one oxygen atom is double-bonded to carbon atom, and another one is single bonded to the carbon atom. Also, oxygen is bonded to hydrogen.

As oxygen is electronegative, the two oxygen atoms draw electron density away from the O-H bond and make the bond polar. Also, the electronegativity difference between oxygen and hydrogen is high due to which electrons are attracted towards oxygen and make the bond most polar.

Hence, in acetic acid O-H bond is most polar.

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Organic compounds

Keywords: acetic acid, polar bond, polarity, electronegativity, O-H bond, CH3COOH, and carboxylic group.

Final answer:

The O-H bond in acetic acid is the most polar due to a large difference in electronegativity between oxygen and hydrogen.

Explanation:

The bond in the acetic acid molecule CH3COOH that is the most polar is the O-H bond. This polarization is due to the difference in electronegativity between oxygen (3.5) and hydrogen (2.1), which is 1.4 according to the Pauling scale. This significant difference leads to a highly polar covalent bond, meaning the electrons are more attracted to the oxygen atom, giving it a partial negative charge and the hydrogen a partial positive charge.

The heat of reaction for this system can be calculated using the formula: Heat of reaction = mass of the calorimeter x specific heat of the calorimeter x change in temperature.

The heat of the reaction for this system can be calculated using the formula:

Heat of reaction = mass of the calorimeter x specific heat of the calorimeter x change in temperature.

Plugging in the given values:

Using the formula, we can calculate:

Heat of reaction = 1.500 kg x 0.00252 J/kg•K x 0.985 K = 0.0037072 J

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