A) The equilibrium between carbon dioxide gas and carbonic acid is very important in biology and environmental science.
CO2 (aq) + H2O (l) H2CO3 (aq)
Which one of the following is the correct equilibrium constant expression (Kc) for this reaction?
a) K =[H2CO3]/ [CO2]
b) K=[CO2]/ [H2CO3]
c) K=[H2CO3]/ [CO2][H2O]
d) K=[CO2][H2O]/ [H2CO3]
e) K=1/[H2CO3]
B) For the reaction PCl3(g) + Cl2(g) <-->PCl5(g) at a particular temperature, Kc = 24.3. Suppose a system at that temperature is prepared with [PCl3] = 0.10 M, [Cl2] = 0.15 M, and [PCl5] = 0.60 M. Which of the following is true based on the above?
a) Qc > Kc, the reaction proceeds from right to left to reach equilibrium
b) Qc < Kc, the reaction proceeds from right to left to reach equilibrium
c) Qc > Kc, the reaction proceeds from left to right to reach equilibrium
d) Qc < Kc, the reaction proceeds from left to right to reach equilibrium
e) Qc = Kc, the reaction is currently at equilibrium

Water molecules form hydrogen bonds between each others. Hydrogen bonds are Non - Covalent bond. Hence the correct option is (b).

Hydrogen bonds are a type of non-covalent bond that form between electronegative atoms, such as nitrogen, oxygen, or fluorine, and hydrogen atoms that are covalently bonded to these electronegative atoms. In water molecules, hydrogen bonds form between the partially positive hydrogen atoms of one water molecule and the partially negative oxygen atoms of another water molecule. Hydrogen bonds are relatively weak compared to covalent bonds, but they play a crucial role in determining the properties of water and many other biologically important molecules. For example, the hydrogen bonds between water molecules are responsible for the high boiling point and low vapor pressure of water, as well as its high surface tension. Hydrogen bonds also play a key role in stabilizing the shape and function of proteins, DNA, and RNA, as well as in mediating the interactions between these biological molecules. Overall, hydrogen bonds are a unique type of non-covalent interaction that are essential for the stability and function of many important biological and chemical systems.

To know more about hydrogen bonds please refer: https://brainly.com/question/21220768

#SPJ4

Question - Water molecules form hydrogen bonds between each others. hydrogen bonds are_____. Select the correct option from the following:-

(a) Covalent bond

(b) Non - Covalent bond

(c) Ionic bond

(d) Polar bond

Answer:

F = 150 N

Explanation:

Given data:

Mass of bicycle = 15 kg

Acceleration = 10 m/s²

Force needed = ?

Solution:

Formula:

F = ma

F = force

m = mass

a = acceleration

now we will put the values in formula.

F = 15 Kg × 10 m/s²

F = 150 Kg.m/s²

      Kg.m/s² = N

F = 150 N

Answer:

0.76 moles

Explanation:

mole = mass ÷ molar mass

mass = 143.50

molar mass = 189.36

189.36÷143.50 = 0.757 = 0.76

The moles of Zn(NO3)2 in 143.50 g of this substance is 0.7578.

The molar mass of a substance is defined as the mass of one mole of that substance expressed in grams per mole, which is equal to the mass of 6.022 10 23 atoms, molecules, or formula units.

Molar mass is generally defined as the mass of an Avogadro number of atoms, molecules, or compounds, whereas molecular mass is defined as the sum of all the atomic masses present in the given molecule or compound.

Molecular mass is also referred to as molecular weight. Because the mass is relative to carbon-12, the term "relative molecular mass" is more appropriate.

Molar mass is a related term that refers to the mass of one mole of a sample.

Here, it is given that 143.50 g is the mass of substance.

Mole = mass ÷ molar mass

Mass = 143.50gm

Molar mass = 189.36gm

Mole = 143.50/189.36

Mole = 0.7578

Thus, the answer is 0.7578.

For more details regarding molar mass, visit:

https://brainly.com/question/22997914

#SPJ2

Answer: The bond angle remains 120

Explanation:

Answer:

Please find the complete question in the attached file.

Explanation:

Balanced equation: \(8KMnO_4+14NaOH +Na_2S_2O_3 \longrightarrow 8Na_2MnO_4 +2K_2SO_4 +5H_2O +4KOH\)

Ionic equation:

\(8K^{+} + 8MnO_4^{-}+14Na^{+}+ 14OH^- +2Na^+ S_2O_3^{-}\longrightarrow16Na^+8MnO_4^- +4K^+ + 2SO_4 +5H_2O+4K^+ +4OH^-\)

Net Ionic equation:

\(10 OH^- +S_2O_3^- \longrightarrow 2SO_4^- +5H_2O\)

Answer: the percent composition of Al in Al2(SO4)3 is 15.771%, and the best option to answer the question is letter C.

Explanation:

The question requires us to calculate the percent composition of aluminum (Al) in the compound aluminum sulfate (Al2(SO4)3).

To calculate the percent composition of an element in a compound, such as Al in Al2(SO4)3, first we need to calculate the total molar mass of the compound, then calculate the molar mass that corresponds to the element in the compound, and then estabilish the relationship between these two values.

1) Calculating the molar mass of Al2(SO4)3:

The atomic masses of Al, S and O are 26.981, 32.065 and 15.999 amu, respectively. Thus, we can calculate the molar mass of Al2(SO4)3 as:

Therefore, the molar mass of Al2(SO4)3 is 342.15 g/mol.

2) Calculating the mass of Al in Al2(SO4)3:

There are 2 atoms of Al in the molecule of Al2(SO4)3, thus we can calculate how much, in g/mol, of Al is there in the molecule as:

Therefore, we can say that each mol of Al2(SO4)3 contains 53.962 g of Al.

3) Calculating the percent composition of Al in Al2(SO4)3:

If we consider the molar mass of Al2(SO4)3 as 100%, we can calculate the percentage of Al in this mass as it follows:

mass of 1 mol of Al2(SO4)3 = 342.15 g ------------------------ 100%

mass of Al in 1 mol of Al2(SO4)3 = 53.962 g ---------------- x

Solving for x, we'll have:

Therefore, the percent composition of Al in Al2(SO4)3 is 15.771%, and the best option to answer the question is letter C.

Look for the ones with the same number of protons and different neutrons number

Answer:

c

Explanation:

total production of the three shifts/ total of prediction of each yield x 100%

Answer:

C.) 74.25%

Explanation:

I got it correct on founders edtell

Explanation:

Round 87.073 meters to 3 significant figures. write your answer in scientific notation. step 1: 87.073 rounds to step 2: write scientific notation : meters...

One mole of aluminum contains 6.022 × 10²³ atoms. This number is called Avogadro number. Therefore, 0.55 moles of aluminum contains 3.31 × 10²³ atoms.

One mole of any substance contains 6.022 × 10²³ atoms. This number is called Avogadro number. One mole of every elements contains Avogadro number of atoms.

Aluminum is 13th element in  periodic table. It shows metallic properties as well as some non-metallic properties. The symbol of aluminum is Al. It forms compounds mostly through covalent bonding.

One mole of aluminum contains 6.022 × 10²³ atoms.

Thus, number of atoms in 0.55 moles = 0.55 × 6.022 × 10²³  = 3.31 × 10²³ atoms.

Therefore, the number of Al atoms in 0.55 moles is 3.31 × 10²³ .

Find more on Avogadro number:

https://brainly.com/question/11907018

#SPJ2

The amount in, formula unit. of 33.4 g sodium hydroxide is 5.03 x \(10^{23\) . Option C.

In order to calculate the mass of NaOH from formula units, first, we need to know the molar mass of NaOH, which is 40 g/mol1.

The formula units are related to moles by Avogadro’s number which is 6.022 x 10^23 formula units per mole.

Therefore, we can calculate the mass of NaOH as follows:

33.4 g NaOH = (33.4 g NaOH / 40) x (6.022 x 10^23) = 5.03 x \(10^{23\) formula units.

In other words, there are 5.03 x \(10^{23\) formula units in 33.4 g sodium hydroxide.

More on formula units can be found here: https://brainly.com/question/21494857

#SPJ1

Answer:

The yeast present contains an enzyme called catalase which catalyses the reaction. More the amount of the catalyst added, faster will be the decomposition of the hydrogen peroxide.

According to the claim, Balloon A, which has more blue and less orange, exhibits accurate effusion at a relative effusion rate of 1.303. (orange is 1.303 times more effused than blue).Relative rate of effusion for the orange to blue spheres = 1.531.

The process of effusion is when a gas escapes from a container through a hole that is significantly smaller in diameter than the molecules' mean free path.

Gas molecules flow through a small opening in one container and into another by effusion. Graham's law allows rates of effusion to be compared at the same temperature. Diffusion is the random molecular motion-based movement of gas molecules through one or more other types of gas.

Rate of effusion of Orange / Rate of effusion of blue

= [Mblue / Morange]^1/2

Vrms = sqrt [(3RT/M)]

Vorange / Vblue = [ Mblue / Morange]^1/2

Rate of effusion of Orange / Rate of effusion of blue

= 565/ 369

= 1.531

Thus,  Balloon A, which has more blue and less orange, exhibits accurate effusion at a relative effusion rate of 1.303.

To learn more about the effusion, follow the link;

https://brainly.com/question/26882632

#SPJ1

Answer:

18,300 J

Explanation:

In order to be able to answer this question, you must know the value of water's enthalpy of fusion,  

, which is listed as

ΔH↔ = 18,300J

Now, a substance's enthalpy of fusion tells you how much heat is needed in order to convert   of said substance from solid at its melting point to liquid at its melting point.

In water's case, an enthalpy of fusion equal to  

333.55 J g

333.55 J

of heat.

Your ice cube has a mass of  

55.0 g

Answer:

The ion-electron method involves breaking the reactants into their component ions and transferring electrons between the ions to balance the charge and the atoms. In a basic solution, the S²⁰⁸² ion will gain two electrons to form SO₂. The I¹⁻ ion will lose one electron to form I³⁻. The balanced redox equation using the ion-electron method is:

S²⁰⁸² + 2e⁻ + 2OH⁻ → SO₂ + H₂O

I¹⁻ + e⁻ → I³⁻

The overall balanced equation is:

2S²⁰⁸² + 2OH⁻ + I¹⁻ → 2I³⁻ + SO₂ + H₂O

Answer:

1. To find the mass of water inside the calorimeter, subtract the mass of the calorimeter from the mass of the calorimeter and water.

Trial 1: 2.7691g - 1.3470g = 1.4221g

Trial 2: 2.4351g - 1.3210g = 1.1141g

2. To find the temperature change of the copper, subtract the initial temperature from the highest temperature reached.

Trial 1: 29.6°C - 22.4°C = 7.2°C

Trial 2: 29.8°C - 22.6°C = 7.2°C

3. To find the temperature change of the water inside the calorimeter, subtract the initial temperature from the highest temperature reached.

Trial 1: 29.6°C - 22.4°C = 7.2°C

Trial 2: 29.8°C - 22.6°C = 7.2°C

4. To find the specific heat capacity of copper, use the formula q = mcΔT, where q is the heat absorbed by the copper, m is the mass of the copper, c is the specific heat capacity of copper, and ΔT is the temperature change of the copper.

Trial 1: q = mcΔT = (1.5990g)(0.385J/g°C)(7.2°C) = 4.32J

c = q/mΔT = 4.32J/(1.5990g)(7.2°C) = 0.356J/g°C

Trial 2: q = mcΔT = (1.6193g)(0.385J/g°C)(7.2°C) = 4.37J

c = q/mΔT = 4.37J/(1.6193g)(7.2°C) = 0.361J/g°C

5. To find the average specific heat capacity of copper, add the specific heat capacity of copper for trial 1 to the specific heat capacity of copper for trial 2 and divide by 2.

Average: (0.356J/g°C + 0.361J/g°C)/2 = 0.358J/g°C

When the equilibrium constant (Keq) value is large, it indicates that the forward reaction is favored and the concentration of products is significantly higher than that of the reactants at equilibrium.

In the expression for Keq, [A]a[B]b represents the concentrations of reactants and products raised to their respective stoichiometric coefficients

.For a large Keq value, it implies that the numerator of the expression, which corresponds to the concentrations of the products raised to their stoichiometric coefficients, is much larger than the denominator, which represents the concentrations of the reactants raised to their stoichiometric coefficients.

Consequently, the number representing [A]a[B]b must be relatively small compared to the number representing the products. This suggests that the concentrations of reactants [A] and [B] are considerably lower than the concentrations of products, emphasizing the strong predominance of the forward reaction at equilibrium.

For more such questions on equilibrium

https://brainly.com/question/3159758

#SPJ8

Answer: AYO!

Explanation:

CAUGHT IN 4K

Answer:

It appears that the diagram you provided represents the chemical compound chlorine monofluoride (CI-F). The arrow below the compound may be intended to indicate the movement or flow of electrons in the compound.

Chlorine monofluoride is a highly reactive and toxic compound that is used as a powerful oxidizing agent. It is a compound of chlorine and fluorine, with the chemical formula ClF. It is a yellowish gas at room temperature and has a strong, pungent smell. Chlorine monofluoride is highly reactive and can ignite or explode upon contact with many materials, including water. It is used in a variety of industrial processes, such as the production of semiconductors and the purification of aluminum. However, it can also be harmful to human health if inhaled or ingested, and it should be handled with caution.

Explanation:

The substance that releases 21.2 KJ of energy when 1.42 mol of it freezes is iron, Fe

From the question given above, the following data were obtained from the question:

To determine the substance that will release 21.2 KJ of energy when 1.42 mole of it freezes, we shall shall determine the heat of fusion of the subtance. This can be obtained as illustrated below:

Q = n × ΔHf

Divide both sides by n

ΔHf = Q / n

ΔHf = 21.2 / 1.42

ΔHf = 14.9 KJ/mol

Comparing the heat of fusion of the substance obtained (14.9 KJ/mol) with those given in the table (see attached photo), we can conclude that the substance is iron, Fe

Learn more about heat transfer:

https://brainly.com/question/6363778

#SPJ1

Complete question

See attached photo

Answer:

Preventing erosion – Land Reclamation

Protecting nesting areas – Protecting Biodiversity

Preventing littering – Land Reclamation

Preventing habitat disruption – Protecting Biodiversity

Protecting native species – Protecting Biodiversity

Preventing contamination of soil – Land Reclamation

Explanation:

I really hope I'm right! I tried my hardest, please give me brainliest :)

have a good day!

This is the answer: There have been changes in Earth's life forms over time.

Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

Answer:

The absolute zero temperature T = - 269.91° C

Explanation:

From the given information:

The plot of the volume of the experimental data against the celsius temperature can be expressed mathematically as:

V = mT + c

V = 0.0741 × T+c --- (1)

where;

m, which is the straight line of the slope = 0.0741

replacing the value of V to be = 20 L, T= 0.

Then:

20 = 0.0741 × 0 + c

20 = c

From equation (1), replacing the value of c with 20, we have:

V = 0.0741 × T+20

SO, to determine absolute zero temperature: we have the volume to be zero at absolute zero temperature, Thus:

0 = 0.0741 × T+20

0.0741 T + 20  = 0

0.0741 T = - 20

\(\mathbf{T = \dfrac{-20}{0.0741}}\)

T = - 269.91° C

The fuel released 90 calories of heat.

Let suppose that water experiments an entirely sensible heating. Hence, the heat released by the fuel is equal to the heat absorbed by the water because of principle of energy conservation. The heat released by the fuel is expressed by the following formula:

\(Q = m\cdot c \cdot \Delta T\) (1)

Where:

If we know that \(m = 10\,g\), \(c = 1\,\frac{cal}{g\cdot ^{\circ}C}\) and \(\Delta T = 9\,^{\circ}C\), then the heat released by the fuel is:

\(Q = (10\,g)\cdot \left(1\,\frac{cal}{g\cdot ^{\circ}C} \right)\cdot (9\,^{\circ}C)\)

The fuel released 90 calories of heat.

We kindly invite to check this question on sensible heat: https://brainly.com/question/11325154

Answer:

3rd one

Explanation:

dont have one, i think just think it makes most sense

Answer:It is made up of a single element or type of compound

Explanation: This answer is right because for something to be pure it has to only be made up of 1 thing.

The value of the rate constant at 9.30×102 K is 2.03×102 s–1.

To solve this problem, we can use the Arrhenius equation:

k = A * exp(-Ea/RT)

where:

k = rate constant

A = pre-exponential factor or frequency factor

Ea = activation energy

R = gas constant (8.314 J/mol·K)

T = temperature in Kelvin

We can rearrange this equation to solve for the rate constant at the new temperature:

k2 = A * exp(-Ea/RT2)

where k2 is the rate constant at the new temperature T2.

We are given k1 = 3.241×10-5 s–1 at T1 = 800 K, and Ea = 255 kJ/mol. We need to find k2 at T2 = 9.30×102 K.

To find A, we can rearrange the Arrhenius equation to solve for A:

A = k / exp(-Ea/RT)

Using k1 and T1, we get:

A = 3.241×10-5 s–1 / exp(-255000 J/mol / (8.314 J/mol·K * 800 K))

A = 7.07×1013 s–1

Now we can use A, Ea, k1, and T2 to find k2:

k2 = A * exp(-Ea/RT2)

k2 = 7.07×1013 s–1 * exp(-255000 J/mol / (8.314 J/mol·K * 930 K))

k2 = 2.03×102 s–1

Therefore, the value of the rate constant at 9.30×102 K is 2.03×102 s–1. using Arrhenius equation.

Learn more about Arrhenius equation below.

https://brainly.com/question/14739712

#SPJ1