1(a). Derive the mathematical expression for (i). calculating the equilibrium constant (K) for a redox reaction at 25∘C(5mks) (ii) the Nernst equation. (5mks). (b). A silver-plated spoon typically contains about 2.00 g of Ag. If 12.0 h are required to achieve the desired thickness of the Ag coating, what is the average current per spoon that must flow during the electroplating process, assuming an efficiency of 100%? F=9.65X104C/Niol,MAg​=107.868 g/mol.(7.5mks) 2(a) Calculate the Ecell of the following cells at 25∘C : (i) Cu(s)/Cu2+(aq,1.0M)//Cu2+(aq,1.0M)/Cu.(5mks) (ii) Cu(s)/Cu2+(aq,0.0050M)//Cu2+(aq,1.0M)/Cu. (5mks) (b) Khaothar, a B.Sc. Industrial Chemistry student wishes to plate 11.74 gNi(s) onto a piece of metal using 2 mol/L solution of NiBr2​. How long shall she run a 0.500 A current in order to produce the desired mass of nickel? F=9.65X104C/Mol,MNi​= 58.89 g/mol. (7.5 mks)

Answer:

yo what

Explanation:

The specific exergy of the system is 718 kJ/kg.

Given data:

Mass of Hydrogen (H2) = 3 pounds

Temperature of Hydrogen (H2) = 70 °C

= (70+273.15)

= 343.15 K

Pressure of Hydrogen (H2) = 1.2 MPa

Dead state temperature = 20 °C = (20+273.15) = 293.15 K

Dead state pressure = 101.325 kPa

Properties of hydrogen and water:

Here, we need to calculate the specific exergy of the system by using dead state temperature and pressure.

The specific exergy is defined as the maximum work obtainable when a system is brought to the dead state.

The formula for specific exergy is given as:

Exergy = h - hds

Where,h = specific enthalpy of the system

hds = specific enthalpy of the system at the dead state

We need to first calculate the specific enthalpy of Hydrogen (H2) at 70 °C and 1.2 MPa using the following table:

Hydrogen 70°C, 120k Pa 3162 54.7 4578 11.8

Here, Specific enthalpy of Hydrogen (H2) at 70 °C and 1.2 MPa

(h) = 4578 kJ/kg

Similarly, we need to calculate the specific enthalpy of Hydrogen (H2) at dead state conditions of 20 °C and 101.325 kPa:

Hydrogen 20°C, 101.325 kPa 2650 53.13 3860 11.94

Here,

Specific enthalpy of Hydrogen (H2) at dead state conditions of 20 °C and 101.325 kPa (hds)

= 3860 kJ/kg

Therefore, the specific exergy of the system is:

Exergy = h - hds

Exergy = 4578 - 3860

Exergy = 718 kJ/kg

Therefore, the specific exergy of the system is 718 kJ/kg.

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Materials generally become warmer when they are "absorbed" by light, this statement is more detailed. So, the correct answer is "absorbed by them."

Explanation: When a material absorbs light, it receives energy from the light, which leads to an increase in temperature. When light is absorbed by a material, the energy of the light is transformed into internal energy in the material. The temperature of a material can increase as a result of this energy absorption.

This is due to the fact that the increased internal energy of the molecules in the material causes them to vibrate more quickly and hence results in a temperature rise.

The light reflects or transmits when it passes through the material. When light reflects off a surface, it bounces back in the opposite direction. Transmitted light travels through a material without being absorbed by it.

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Answer:

A: sink

Explanation: If an object's density is:

GREATER than \(1gcm^{3}\), it will SINK in water.

LESS than \(1gcm^{3}\), it will FLOAT in water.

hope this helps

Answer:

The water will evaporate and fly out of the bucket; the process will not stop until there is enough water vapor in the atmosphere that the vapor pressure stops the water from boiling further.

Explanation:

The velocity of an  object is the ratio of the distance to the time. The distance travelled by Kangaroo is 396 m in 12 seconds. So its velocity is 33 m/s.

Velocity is a physical quantity and it is the measure of distance travelled per unit time. Velocity is the rate of speed and it  is a vector quantity.The velocity can be expressed in terms of m/s, Km/hr etc.

Mathematically, velocity is the ratio of distance to the time.

Given that, distance covered by kangaroo is 396 meters.

time taken = 12 s.

therefore, velocity can be calculated as follows:

velocity = distance/time

             = 396 m / 12 s

             = 33 m/s.

Therefore, the velocity of the kangaroo is 33 m/s.

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CrBr3(aq) + 3NaOH(aq) = NaBr + Cr(OH)3s

How do you tell whether a solution is watery?

The most common way to represent it in chemical equations is to add (aq) to the appropriate chemical formula. For instance, the formula for a solution of table salt, or sodium chloride (NaCl), in water is Na +(aq) + Cl (aq).

Water with one or more dissolved substances is known as an aqueous solution. An aqueous solution can contain dissolved gases, particles, or other liquids.

In a mixture called a solution, every component is well combined. Solutions can contain solids, liquids, and gases and are regarded as homogenous mixes. A solute and a solvent make up a solution. Any substance that dissolves in a solvent is referred to as a solute.

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The 0.27 moles of CO2 and 11.88 grams of CO2.

What is mole?

The term "mole" refers to the quantity of a substance that contains the same number of elementary particles (ions, molecules, or atoms) as there are carbon atoms.

What is molarity?

The volume of solution containing a substance determines its molarity (M). Molarity refers to how many moles of a solute there are in a solution per liter. A different term for molarity is a solution's molar concentration.

Explanation: Use the Ideal Gas Law, PV = nRT, substitute the values given and solve.

P = 1.5atm

V = 4.5L

n = moles

R = 0.0821gr/mol (when using atm, kPa is 8.31)

T = 300K

Isolate what you don't have, in this case n. Change PV = nRT to PV/RT = n. Substitute the values to get moles. Once you have this, multiply the value by the molar mass of CO2 (44gr/mol) to get the mass of CO2 in grams.

Therefore,0.27 moles of CO2 and 11.88 grams of CO2.

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The phase transition which occurs when a substance increases temperature at constant pressure is solid to liquid. The correct option is A.

It can be seen in the attached diagram that when the substance is at 120 degrees C and 925 mmHg, it is in the solid phase. Then, if we increase the temperature while keeping the pressure as constant, it will change to the liquid phase.

The lines represent the combinations of pressures and temperatures where two phases can exist in equilibrium. In another words, these lines show phase change points. The line divides the solid and gas phases, defines sublimation (solid to gas) and deposition (gas to solid).

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Although part of your question is missing, you might be referring to this full question: Consider the phase diagram shown here. A sample of the substance in the phase diagram is initially at 120 degrees C and 925 mmHg. What phase transition occurs when a substance increases temperature at constant pressure?

a) solid to liquid

b) liquid to gas

c) solid to gas

d) liquid to solid

Answer:

Hot magma rises from the mantle at mid-ocean ridges pushing the plates apart. Earthquakes occur along the fractures that appear as the plates move apart.:

The initial temperature of the calorimeter was approximately 50.25 °C.

To determine the initial temperature of the calorimeter, we need to consider the heat gained and lost by each component involved.

First, let's calculate the heat gained or lost by the hot metal block. Using the formula Q = mcΔT, where Q is the heat absorbed or released, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature, we can calculate:

Q_hot metal = (21.491 g) * (1.457 J/g°C) * (33.46°C - 95.84°C) = -3507.67 J

Step 2: Next, we calculate the heat gained or lost by the cold metal block:

Q_cold metal = (21.491 g) * (54.01 J/°C) * (33.46°C - (-5.90°C)) = 18067.31 J

Step 3: Finally, we calculate the heat gained or lost by the calorimeter:

Q_calorimeter = (30.57 J/°C) * (33.46°C - T_calorimeter) = 3507.67 J + 18067.31 J

Since the heat gained by the hot metal block and the cold metal block must be equal to the heat gained by the calorimeter (assuming no heat is lost to the surroundings), we can set up the equation:

3507.67 J + 18067.31 J = (30.57 J/°C) * (33.46°C - T_calorimeter)

By solving this equation, we find T_calorimeter to be approximately 50.25°C.

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Answer:

With greater depth of the atmosphere, more air is pressing down from above. Therefore, air pressure is greatest at sea level and falls with increasing altitude

Explanation:

On top of Mount Everest, which is the tallest mountain on Earth, air pressure is only about one-third of the pressure at sea level.

Answer: I'm not for sure but the sun ?

Answer:

the distance between the electron and nucleus

Answer:

The energy required is 158 J

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

When the heat added or removed from a substance causes a change in temperature in it without affecting its molecular structure, this heat is called sensible heat.

In other words, when a system absorbs (or gives up) a certain amount of heat, it can happen that it experiences a change in its temperature, which implies sensible heat.

The equation that allows calculating heat exchanges is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

Replacing:

Q= 0.79 \(\frac{J}{g*C}\) *10 g* 20 C

Solving:

Q= 158 J

The energy required is 158 J

Answer:

d. both b and c

Explanation:

Standard enthalpy is typically measured at standard atmospheric pressure and standard state conditions, which means a pressure of 1 atmosphere and at a specified temperature that may vary depending on the context. However, it is common to use room temperature (around 25 degrees Celsius or 298 Kelvin) as the standard temperature for measuring enthalpy. Therefore, the standard enthalpy is measured at both standard atmospheric pressure and standard state conditions, as well as at room temperature and 1 atmosphere.

Explanation:

PH=14-POH

=14-2.6

=11.4

The balanced net-ionic equation for the sulfide ions (S2-) oxidizing to elemental sulfur (S8) in the presence of permanganate (MnO4-) under acidic conditions is:

2 MnO4-(aq) + 8 S2-(aq) + 16 H+(aq) → S8(s) + 2 Mn2+(aq) + 8 H2O(l)

To balance the equation, we start by balancing the atoms other than hydrogen and oxygen. In this case, we have 2 manganese (Mn) atoms on the product side, so we place a coefficient of 2 in front of MnO4-. Now, there are 8 oxygen (O) atoms on the reactant side, so we need 8 H2O molecules as products to balance the oxygens. Next, we balance the hydrogen (H) atoms by adding 16 H+ ions on the reactant side.

After balancing the atoms other than hydrogen and oxygen, we check the charge on both sides. We have a total charge of -8 on the reactant side due to the 8 sulfide (S2-) ions, and a total charge of +4 on the product side due to the 2 manganese (Mn2+) ions. To balance the charges, we add 8 electrons (e-) on the reactant side.

The final balanced equation for the sulfite test is:

2 MnO4-(aq) + 8 S2-(aq) + 16 H+(aq) → S8(s) + 2 Mn2+(aq) + 8 H2O(l) + 8 e-

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A photon with a wavelength of 91.2 nm would be required to ionize a hydrogen atom in the ground state and give the ejected electron a kinetic energy of 14.5 eV.

To ionize a hydrogen atom in the ground state and give the ejected electron a kinetic energy of 14.5 eV, the wavelength of the required photon can be calculated using the equation:
E = hc/λ - Eionization
Where E is the energy of the photon, h is Planck's constant, c is the speed of light, λ is the wavelength of the photon, and Eionization is the ionization energy of hydrogen (13.6 eV).
Plugging in the values, we get:
14.5 eV = hc/λ - 13.6 eV
Solving for λ, we get:
λ = 91.2 nm
Therefore, a photon with a wavelength of 91.2 nm would be required to ionize a hydrogen atom in the ground state and give the ejected electron a kinetic energy of 14.5 eV.

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0.0305mol of carbon dioxide can be produced when 3.05 mole of calcium carbonate are heated.

Carbon dioxide is a chemically compound made up of molecules that each one have  one carbon atomclick covalently double bonded to two oxygen atoms. It is founded in the gas state at room temperature. In the air, carbon dioxide is to the  transparent to visible light of the  but absorbs infra-red by radiation, acting as the  greenhouse gas.

CaCO3 ---> CaO + CO2

Mass of CaCO3 mol = 40 + 12 + (16 x 3) = 100g/mol

Number of CaCO3 moles heated = 3.05/100 = 0.0305 mol

One CaCO3 mol produces 1 mol CO2

Therefore 0.0305mol  of CO2 produced.

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Answer:

a)Mg(s) + 2HCl(aq) -------> MgCl2(aq) + H2(g)

b) 0.125 moles of hydrogen gas is reduced in the reaction.

C) 3.18 L

d)2.25 g of water

Explanation:

a) the equation of this reaction is;

Mg(s) + 2HCl(aq) -------> MgCl2(aq) + H2(g)

b)

Number of moles= concentration × volume= 1.0 × 250/1000 = 0.25moles of HCl

From the equation;

2 moles of HCl yields 1 mole of hydrogen gas

Hence 0.25 moles of HCl yields 0.25 × 1/2 = 0.125 moles of hydrogen gas

Thus 0.125 moles of hydrogen gas is reduced in the reaction.

c)

P= 760 mmHg (standard pressure)

V= ????

T= 298 K

n= 0.125 moles

R= 0.082 atm dm-3K-1mol-1

Since the gas is collected over water, SVP of hydrogen at 25°c is 28mmHg

Therefore; P=760-28= 732mmHg

But

1 atm =760 mmHg

Therefore 732 mmHg= 732/760= 0.96 atm

PV=nRT

V= nRT/P

V= 0.125 × 0.082 × 298/0.96

V= 3.18 L

Note 1dm-3=1L

d)

2H2(g) + O2(g) ----> 2H2O(g)

From the equation;

2 moles of hydrogen yields 2 moles of water

0.125 moles of hydrogen yields 0.125 moles of water

Mass of water = 0.125 moles × 18gmol-1 = 2.25 g of water

Answer:

Lithium (Li)

Explanation:

Lithium has an atomic number of  3

A catalyst used in a reaction remains unchanged

Large things are made of more molecules than smaller things.

Larger objects have more total kinetic energy than smaller objects at the same temperature.

Kinetic energy is defined as the energy of an object due to its motion. If we want to speed up an object, then we must apply a force on it. Applying a force needs us to do work. After work has been done, energy has been transferred to the body or object, and the object will be moving at a constant speed.

Every moving object has kinetic energy. Examples of kinetic energy at work are a person walking, a moving baseball, an object falling from a table, and a charged particle in an electric field.

So we can conclude that large and kinetic energy are the correct answers.

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Answer:

3.56

Explanation:

Answer:

Accuracy of a measured value refers to how close a measurement is to the correct value. The uncertainty in a measurement is an estimate of the amount by which the measurement result may differ from this value. Precision of measured values refers to how close the agreement is between repeated measurements.

Explanation:

Answer:

4.4 g

Explanation:

The equation of the reaction is;

NaHCO3 (aq) + CH3COOH (aq) ----> CO2 (g) + H2O (l) + CH3COONa (aq)

Mass of baking soda - 4.5 g

Molar mass of NaHCO3 = 84.007 g/mol

Number of moles of baking soda= 4.5 g/84.007 g/mol = 0.0536 moles

If 1 mole of NaHCO3 yields 1 mole of CH3COONa

0.0536 moles of NaHCO3 also yields 0.0536 moles moles of CH3COONa

Hence;

Theoretical yield of CH3COONa =  0.0536 moles * 82.0343 g/mol = 4.4 g

Answer:

Wavelength (D)............

Answer:

A

Explanation:

the amplitude is measured from the dotted line to the top of the crest. Looking at the picture the amplitude gets smaller