em
RT In K
nF
where E is standard
electrode potential of a reaction, increasing the
yalue of K will
12. From E =

vaporization's enthalpy is 40.88 kJ/mol.

The amount of energy (enthalpy) required to turn a portion of a liquid into a gas is known as the enthalpy of vaporization (symbol Hvap), also known as the (latent) heat of vaporization or heat of evaporation.

Enthalpy of vaporization  ∆Hvap

T1 = 25 + 273 = 298 K

T2 = 100 + 273 = 373 K

Cp(1) = 0.07529 kJ/K.mol

Cp(2) = 0.03358 kJ/K.mol

So dHvap at 100 oC would be,

dHvap = dHvap at 25 oC + (Cp(2) - Cp(1)(T2-T1)

= 44.01 + (0.03358 - 0.07529)(373-298)

= 40.88 kJ/mol

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The value of concentration of [tex]H^{+}[/tex] and [tex]OH^{-}[/tex]  of three solutions whose pH  is given are ,

( a ) The  [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of  solution is 0.11 M and  7.28 × [tex]10^{-6}[/tex] M.

( b ) The  [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of  solution is  4.69 × [tex]10^{-6}[/tex] M and  0.177 M .

( c ) The  [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of  solution is 0.002 M and  3.28 × [tex]10^{-4}[/tex] M .

( a )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

Given pH =  2.17

then pH = - ㏒ [  [tex]H^{+}[/tex] ] = 2.17

[  [tex]H^{+}[/tex] ]  = 0.11 M

pH + pOH = 14

pOH =   14 - pH =  14 -  2.17 = 11.83

pOH =  - ㏒ [  [tex]OH^{-}[/tex] ] = 11.83

[  [tex]OH^{-}[/tex] ]  = 7.28 × [tex]10^{-6}[/tex] M

Therefore , the  [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of  solution is 0.11 M and  7.28 × [tex]10^{-6}[/tex] M.

( b )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

Given pH =  5.96

then pH = - ㏒ [  [tex]H^{+}[/tex] ] = 12.27

[  [tex]H^{+}[/tex] ]  = 4.69 × [tex]10^{-6}[/tex] M

pH + pOH = 14

pOH =   14 - pH =  14 -  12.27= 1.73

pOH =  - ㏒ [  [tex]OH^{-}[/tex] ] = 1.73

[  [tex]OH^{-}[/tex] ]  = 0.177 M

Therefore , the  [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of  solution is 4.69 × [tex]10^{-6}[/tex] M and  0.177 M .

( c )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

Given pH =  5.96

then pH = - ㏒ [  [tex]H^{+}[/tex] ] = 5.96

[  [tex]H^{+}[/tex] ]  = 0.002 M

pH + pOH = 14

pOH =   14 - pH =  14 -  5.96 = 8.04

pOH =  - ㏒ [  [tex]OH^{-}[/tex] ] = 8.04

[  [tex]OH^{-}[/tex] ]  = 3.28 × [tex]10^{-4}[/tex] M

Therefore , the  [tex]H^{+}[/tex] and [tex]OH^{-}[/tex] of  solution is 0.002 M and  3.28 × [tex]10^{-4}[/tex] M .

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Answer:

Balancing a chemical equation involves a certain amount of trial and error. In general, however, you should follow these steps:

Count each type of atom in reactants and products. Does the same number of each atom appear on both sides of the arrow? If not, the equation is not balanced, and you need to go to step 2.

Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances. Use the smallest coefficients possible. Warning! Never change the subscripts in chemical formulas. Changing subscripts changes the substances involved in the reaction. Change only the coefficients.

Repeat steps 1 and 2 until the equation is balanced.

Explanation:

Gravitational force between the moon and the astronaut change are decrease

The force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them

We can visualize the effect mathematically via the equation for newton's law of gravitation

Fgrav = Gm₁m₂/r₂

From this relationship, we can see that force Fgrav and square of the distance rare inversely proportional as one increases the other decreases

Therefore, as the distance between the astronaut and earth increases, the magnitude of the gravitational force will decrease

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The density of the metal cube is  7.874 kg/m³

Density is a word we use to describe how much space an object or substance takes up means its volume in relation to the amount of matter in that object or substance means its mass and another way to put it is that density is the amount of mass per unit of volume and if an object is heavy and compact it has a high density

Here given data is metal cube with a volume = 20 cubic centimeters and mass = 157.48 gram so we have to find density of the metal cube = ?

So, density = mass/volume means ρ = m/V

Density = 157.48 gram/20 cubic centimeters

Density = 7.874 kg/m³

The density of the metal cube is  7.874 kg/m³

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Based on the cryoscopic constant and the ebullioscopic constant of benzene, we can calculate that the boiling point of this solution will be 82.33 °C.

For this calculation, we require both the cryoscopic constant (Cf = 5.12 °Ckg/mol) and the ebullioscopic constant (Cb = 2.52 °Ckg/mol) for benzene. These describe the shifts in benzene's freezing and boiling points based on the molality of the solution (with benzene as the solvent).

Because we know that the change in benzene's freezing point is 5.53 °C - 1.00 °C = 4.53 °C, we can now calculate the molality of the solution and use it to calculate the boiling point of the same solution.

Δt(freezing) = m * Cf ⇒ m = Δt / Cf = 4.53 °C / 5.12 °Ckg/mol = 0.885 mol/kg

Δt(boiling) = m * Cb = 0.885 mol/kg * 2.52 °Ckg/mol = 2.23 °C

t (boiling) = 80.10 °C + 2.23 °C = 82.33 °C

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Explanation:

A. mole=mass/molar mass

Molar mass of NaCl=23+35.5g

NaCl=58.5g

from

mole=0.90/58.5mol

mole=0.90g/58.5mol

mole=0.15

B. concentration=number of moles of solute/volume of solution

concentration=0.15mol/250cm^3

1dm^3=1000cm^3

250=0.25

concentration=0.6mol/dm^3

Answer:

need They need water, nutrients and sun

Both need to capture certain substances from the environment, with the only difference being the method they use. Thus, while animals ingest them with food, plants absorb them from the soil. This is the case of water and nutrients.

The volume of O₂ produced at STP after 5.0g of KCIO3 is decomposed is 1.317L.

For experimental measurements to be established under standard conditions that allow for comparisons between various sets of data, standard temperature and pressure must be met. The nominal atmospheric conditions at sea level are referred to as "standard temperature and pressure" (STP). The temperature and pressure are both zero degrees Celsius (atm). STP, or Standard Temperature and Pressure, refers. 2. The STP value of gas temperature, according to IUPAC, is 15 K. 2. According to IUPAC, gas is at 15 K in the STP. VSTP is equal to V* (273.15/T)* (P/760) Kelvins, Torrs, and Liters are used in the STP formula. The number of gas molecules at a standard temperature and pressure, or STP, has been calculated using this law. STP is measured in Kelvin and atmospheres.

39.01 g [tex]mol^{-1}[/tex]  +  35.45 g[tex]mol^{-1}[/tex]   + 3.1600 g[tex]mol^{-1}[/tex]

= 122.46 g[tex]mol^{-1}[/tex]

To get the material's molecular weight, divide the overall mass of the substance by its relative mass.

5g/ 122.46g[tex]mol^{-1}[/tex]  = 0.041mol

There are two moles of KLC[tex]CO_{3}[/tex]  for every 3 moles of [tex]O_{2}[/tex] , that can be seen from the equation. Using the ratio 2:3 and inserting 0.048 mol we find that there must be 0.0612 mol [tex]O_{2}[/tex].

At STP (standard temperature and pressure), a mole of an ideal gas takes up 22.4 liters.

Hence

22.4 l[tex]mol^{-1}[/tex] × 0.0612 mol

= 1.317 L

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( a ) The pH of 5.9 × [tex]10^{-8}[/tex]  M hydronium-ion concentrations is 7.22 .

( b ) The pH of 3.5 × [tex]10^{-12}[/tex]  M hydronium-ion concentrations is 11.45

( c ) The pH of 7.0 × [tex]10^{-3}[/tex]  M hydronium-ion concentrations is 2.14 .

( d ) The pH of 6.66× [tex]10^{-9}[/tex]  M hydronium-ion concentrations is 8.17

( a )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

pH = - ㏒ [ 5.9 × [tex]10^{-8}[/tex]  M ]

pH = 7.22

Therefore , the pH of 5.9 × [tex]10^{-8}[/tex]  M hydronium-ion concentrations is 7.22 .

( b )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

pH = - ㏒ [ 3.5 × [tex]10^{-12}[/tex]  M ]

pH = 11.45

Therefore , the pH of 3.5 × [tex]10^{-12}[/tex]  M hydronium-ion concentrations is 11.45 .

( c )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

pH = - ㏒ [ 7.0 × [tex]10^{-3}[/tex]  M ]

pH = 2.14

Therefore , the pH of 7.0 × [tex]10^{-3}[/tex]  M hydronium-ion concentrations is 2.14 .

( d )

pH = - ㏒ [  [tex]H^{+}[/tex] ]

pH = - ㏒ [ 6.66× [tex]10^{-9}[/tex]  M ]

pH = 8.17

Therefore , the pH of 6.66× [tex]10^{-9}[/tex]  M hydronium-ion concentrations is 8.17

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i do not know much about that

The enthalpy of reaction for the solution of barium sulphate and sodium nitrate in a coffee cup calorimeter is 1170.4 J.

The enthalpy associated with a reaction is the heat absorbed or released by the reaction system. In a coffee cup calorimeter, the reaction enthalpy is equal to the heat change in the reaction system.

The reaction enthalpy is calculated as follows:

ΔH (rxn) = cmΔT, where c is specific heat capacity.

c for barium sulphate solution is 4.18 J/(g K) and weight is 200 with a temperature change if 23.5 degree Celsius (296.65 K) to 24.9 (298.05 K).

Apply these values to the equation above.

ΔH (rxn) = (4.18 J/(g K) × 200 g) ×(298.05-296.65)K = 1170.4 J.

Hence, enthalpy of the given reaction is 1170.4 J.

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In Bohr's Model of the atom, the option that is included  is option b, c and e:

As long as the energy of the photon was equal to the energy difference between the beginning and final energy levels, the Bohr model predicts that an electron would take in energy in the form of photons to be excited to a higher energy level.

The ground state, which describes the electrons when they are at their lowest energy, is typical. An atom's electrons can absorb energy by moving up to a higher energy level, or excited state, if they are supplied energy (via heat, electricity, as well as light, etc.).

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By using the no. of moles, the mass of AgCl formed is determined to be 23.50g.

The mass of a material that includes the substance's particles is referred to as a mole.

The number of moles of a material equals to the ratio of its given mass to the mass of one mole of that substance in a chemical reaction. A mole / the no. of moles of any substance is equal to Avogadro's number, which is 6.023 x [tex]10^{23}[/tex]. Additionally, no. of moles is employed to represent concentration measurements like mole per liter and molecular weight.

[tex]2AgNO_3 (aq) + CaCl_2 (aq) \rightarrow 2AgCl (s) + Ca(NO_3)_2 (aq)[/tex]

Since [tex]AgNO_3[/tex] is in excess, the amount of product formed will be decided by the quantity of [tex]CaCl_2[/tex], which is the limiting reagent.

1 mole of [tex]CaCl_2[/tex] produces 2 moles of AgCl

No. of moles of [tex]CaCl_2[/tex] = mass of [tex]CaCl_2[/tex] / molar mass of [tex]CaCl_2[/tex]

No. of moles of [tex]CaCl_2[/tex] = 9.11 / 110.98 = 0.0820 moles

No. of moles of AgCl formed = 2 x 0.0820 = 0.164 moles

Mass of AgCl formed = No. of moles x molar mass

Mass of AgCl formed = 0.164 x 143.3 = 23.5012g

Result:

23.50g of AgCl is formed.

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The alkoxide group responsible for the nucleophilic attack on the carbonyl group (more precisely the carbon atom) during peptide bond cleavage in chymotrypsin belongs to the serine 195 side-chain.

Because only serine and threonine of all the amino acids contain hydroxy-groups, only they qualify as possible answers. When we look at the structure of the chymotrypsin, we can see that there is a serine 195, so it must be it. Indeed, during peptide bond cleavage, histidine 57 side-chain deprotonates the serine 195 side chain, turning into a nucleophilic hydroxy-group, which can then attack the carbonyl group, held in place by the glycine 193's residue.

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Answer: the speed of something in a given direction

Explanation:

yuuuuuuh

Answer:

Velocity defines the direction of the movement of the body or the object.

Explanation:

velocity is the speed of motion, action, or operation

Answer:

Breaking the bread

Explanation:

Because you're just breaking the bread into pieces.

The balanced chemical reaction for this process looks like this:
[tex]Pb(NO_{3} )_{2} (aq) + 2 KCl (aq)[/tex] → [tex]PbCl_{2} (s) + 2KNO_{3} (aq)[/tex]
The reaction includes forming a precipitate.

The exact grams of the salts are unnecessary, because the chemical reaction will happen no matter the ratio, and the precipitate formed will not dissolve in excess of either reagent.

Both lead(II) nitrate and potassium chloride are salts that are very soluble in water. However, halogenides of lead (chloride, bromide, iodide) are insoluble in water (solubility decreases from chloride to iodide) and so, upon mixing of the two solution, a precipitate of lead(II) chloride will form. Potassium nitrate remains soluble, as most of potassium salts are very soluble in water.

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Ryan calculates that he requires 4 ice cubes for 250mL of hot tea to reach the optimal drinking temperature by using the specific heat capacity of tea.

A substance's potential to hold heat is indicated by its specific heat capacity. This substance size reflects the amount of heat required to raise a certain volume of a material's temperature by one Kelvin. Specific heat capacity is a distinguishing feature of every substance and is useful for material identification.

Given:

Final temperature of system is 57.8℃

dT1 = 79.1 - 57.8 = 21.3℃

dT2 = 0 - (-8.33) = 8.33℃

dT3 = 57.8 - 0 = 57.8℃

Mass of tea, m1 = 250.0mL = 250.0g = 0.250kg

Specific heat capacity of tea, C1 = 4186 J/kg℃ = Specific heat capacity of water

Specific heat capacity of ice, Ci = 2090 J/kg℃

Mass of each ice cubes, m of i = 18.8g

Latent heat of fusion of ice, Lf = 334 kJ/kg

To find:

No. of ice cubes required = ?

Calculations:

Suppose equilibrium temperature is T, then

Heat released by Tea = Heat gained by Ice

Q1 = Q2

m1x C1x dT1 = mi x Ci x dT2 + mi x Lf + mi x Cw x dT3

0.250x 4186 x 21.3 = mi x (2090 x 8.33 + 3.34 x [tex]10^4[/tex] + 4186 x 57.8)

mi = 0.250 x 4186 x 21.3 / (2090 x 8.33 + 3.34 x [tex]10^4[/tex] + 4186 x 57.8)

mi = 0.0761kg = 76.1g

Mass of ice required = 76.1g

Number of ice cube required will be:

n = Total mass of ice/mass of each ice cube

n = 76.1/18.8

n = 4.04 ice cubes = 4.0 ice cubes

Result:

Ryan requires 4 ice cubes to bring 250mL of hot tea to the optimal drinking temperature.

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To slow down that particular cellular activity by controlling the enzyme we wil decrease the temperature of the incubator where the cells are growing.

Anselme Payen was the first to discover an enzyme. A biological catalyst which alter the rate of the chemical reaction is known as Enzyme. It is not destroyed during the reaction and is used over and over. These are proteins made up of of amino acids linked together in one or more polypeptide chains.

We need to  decrease the temperature of the incubator where the cells are growing to slow down that particular cellular activity by controlling the enzyme.

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Answer: Cubic meters: .01176

Liters: 11.76

Cubic inches: 717.639231

Cubic feet: 0.415300481

Explanation:

Velocity = Frequency x Lambda

Assuming that this is referring to an electromagnetic wave. The velocity of light is 2.998 x 10^8 m/s.

Convert the wavelength from cm to m. So divide it by 100 and you get 5.4x10^-7 meters.

2.998 x 10^8 = 5.4 x 10^-7 (λ)

Solve for λ and you get 5.55 x 10^14 Hz

The frequency of the wave is equal to 5.55 ×10¹⁴ s⁻¹.

Frequency can be defined as the number of oscillations of a wave in one second. The frequency of the wave has S.I. units which are per second or hertz.

Wavelength can be described as the distance between the two most adjacent points in phase with each other. Two adjacent crests or troughs on a wave are separated by a distance of a single wavelength.

The relationship between frequency, speed of light, and wavelength is:

c = νλ

Given, the wavelength of the wave, λ = 5.4 ×10⁻⁵ cm

Then the speed of the wave is speed of light, c = 3 ×10¹⁰ m/sc

The frequency of the waves can be calculated from the above mentioned relationship:

The frequency of the given wave will be equal to:

ν = c/λ = 3× 10¹⁰/5.4 ×10⁻⁵ = 5.55 ×10¹⁴ s⁻¹

Therefore, the frequency of the wave is equal to 5.55 ×10¹⁴ s⁻¹.

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The equation for gravitational potential energy is GPE = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 on Earth), and h is the height above the ground in meters.

So there for larger objects have greater cause an object with greater mass will have more gravitational potential energy than an object with less mass, when the objects are at the same height.

Five observable properties for separating mixtures are particle size, colour, texture, shape, magnetic attraction.

Mixtures are compounds that are made up of two or more chemical compounds which are not linked to each other chemically. They can be easily separated.

The mixtures can be separated by properties like particle size, colour, density, shape, magnetic attraction.

Sieving can be used to separate compounds based on particle size. Chromatography can be used to separate compounds based on colour as each colour would have differences in properties. Flotation can be used to separate compounds based on density like oil in water. Centrifugation can be used to separate compounds based on shape. Magnetic separation can be used to separate metals from non-metal compounds in a mixture.

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Jupiter have the force of gravity 2.54 times that of earth

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Elements that can conduct electricity include metals. One of three classes of elements, they (the other two classes are nonmetals and metalloids). The largest of the three classes is by far metals.

Metals are all elements besides hydrogen that undergo chemical reactions and lose electrons to produce positive ions. Metals are electropositive elements as a result. They are distinguished by their brilliant brilliance, hardness, capacity for resonance, and excellence as heat- and electricity-conductors.

Brass, steel, aluminium, copper, silver, and other metals are frequently used as electrical conductors. Silver, copper, and gold are the metals that conduct electricity the best.

Among the physical characteristics used to separate the three groups are: A substance's capacity to reflect light is referred to as luster. The adjectives are often either metallic or non-metallic. The ability of a substance to carry electricity is referred to as conductivity. You might use a conductivity meter to test this.

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Answer:

Solid

Explanation:

Solid state because carbon dioxide can go sublimation so generally at relatively lower temperature it is found in solid form but at room temperature,ie, 25 to 30°C it is found in gaseous state.

Dietary fats include saturated fat. Along with trans fat, it is one of the harmful fats. Most of the time, these fats are solid at room temperature. High quantities of saturated fat are found in foods like butter, palm and coconut oils, cheese, and red meat.

Stearic acid, palmitic acid, myristic acid, and lauric acid are examples of typical dietary saturated fatty acids.

Each carbon molecule in saturated fat is bonded to hydrogen, or "saturated," as a result of which the molecules are stable when the fat is cooked. As a result, heat won't cause them to oxidize or go rancid. The finest fats to use while cooking at temperatures above 180°C are saturated fats.

Unsaturated fats, which are liquid at room temperature, are regarded as healthy fats because they have a range of positive effects on health, including lower blood cholesterol levels, less inflammation, stable cardiac rhythms, and more.

The more polyunsaturated a fat is, the quicker it will oxidize since unsaturated fats are more prone to oxidation than saturated fats. Due to the more brittle double bonds, which permit more oxygen to react at those sites, this has occurred.

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Answer: 63.6166 amu (atomic mass units)

Explanation: When an element X is written in the form of X-N, N will the atomic mass of that element. So we have copper with a mass of 63 and 65. We are given percentages of each one. 69.17/100 of the copper atoms will be of weight 63 while 30.83/100 will be of weight 65. Keep in mind that amu does not actually mean weight but I'm just using it as a tool to help explain the general concept. Assume you have 100 copper atoms, and you need to find the average atomic mass for them, if you do this you will solve the problem. Due to the fractions, 69.17 of them will be 63 amu and the rest will be 65. So do 69.17*63+65*30.83 and divide by one hundred. By doing this you will get 63.6166. If my answer doesn't make sense, search up how to calculate weighted averages

Hope this helps

Answer:

That is it are you okay.

Explanation:

thank you

A reference value is provided by the control, which can then be compared to the samples in which the value of a variable was altered.

This is further explained below.

Generally, Control is a management function that aids in mistake detection and the implementation of remedial measures.

This is done to reduce departure from standards and make that the organization's stated objectives are met in the desired way.

In conclusion, The control offers a standard against which samples with varying changes may be measured.

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