how many coulombs are required to produce 91.6 g of potassium metal from a sample of molten potassium chloride?

Answer: False

Explanation:

false

Answer:

Explanation:

Silicon dioxide doesn't have any mobile electrons or ions - so it doesn't conduct electricity either as a solid or a liquid.

The types of chemical bonds present in a mixture of water (water molecules) and oil (triglyceride molecules) are: Hydrogen bonds and van der Waals interactions.

Water molecules are polar and form hydrogen bonds with each other. These hydrogen bonds result from the attraction between the partially positive hydrogen atom of one water molecule and the partially negative oxygen atom of another water molecule.

Oil, on the other hand, primarily consists of nonpolar molecules such as triglycerides. Nonpolar molecules do not form hydrogen bonds but can interact through weak attractive forces known as van der Waals interactions. These interactions occur due to temporary fluctuations in electron distribution, resulting in induced dipoles that attract each other.

Therefore, in the mixture of water and oil, hydrogen bonds form between water molecules, while van der Waals interactions occur between oil molecules and potentially between water and oil molecules.

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a) The temperature of the air after passing through the heating section is 28°C, and the relative humidity is 50%.

b) The rate of heat transferred to the air is 452.25 kW.

c) The rate of water added by the evaporative cooler is 0.305 kg/min or 18.3 kg/h.

d) The evaporative cooler is important because it adds moisture to the air.

To determine the temperature and relative humidity of the air after it passes through the heating section, we can follow the following steps:

a) Temperature and Relative Humidity Calculation:

The air enters the evaporative cooler at 10°C with a relative humidity of 60%.

We need to calculate the water vapor pressure (Pw) using the saturation vapor pressure at 10°C, which is 1.227 kPa.

Pw = 60% x 1.227 = 0.736 kPa

The remaining partial pressure of the air (Pa) can be calculated by subtracting the water vapor pressure from the atmospheric pressure (101.3 kPa).

Pa = 101.3 - 0.736 = 100.56 kPa

Next, the air enters the heating section at 28°C. We need to calculate the water vapor pressure using the saturation vapor pressure at 28°C, which is 3.733 kPa.

Pw = 50% x 3.733 = 1.866 kPa

Again, calculate the remaining partial pressure of the air (Pa) by subtracting the water vapor pressure from the atmospheric pressure (101.3 kPa).

Pa = 101.3 - 1.866 = 99.43 kPa

Therefore, the temperature of the air after passing through the heating section is 28°C, and the relative humidity is 50%.

b) Rate of Heat Transfer Calculation:

The mass flow rate of the air is given as 25 m³/min.

We can convert the mass flow rate to kg/min by using the density of air.

Mass flow rate = Volume flow rate x Density

Density of air is approximately 1.225 kg/m³.

Mass flow rate = 25 x 1.225 = 30.625 kg/min

The specific heat capacity of air at constant pressure is 1.005 kJ/(kg·K).

Now we can calculate the rate of heat transferred using the formula:

Rate of heat transferred = mass flow rate x specific heat capacity x (Tout - Tin)

Tin = 10°C (temperature of air entering the evaporative cooler)

Tout = 28°C (temperature of air leaving the evaporative cooler)

Rate of heat transferred = 30.625 x 1.005 x (28 - 10) = 452.25 kW

Therefore, the rate of heat transferred to the air is 452.25 kW.

c) Rate of Water Added Calculation:

The mass flow rate of the dry air is the same as the mass flow rate of the air, which is 25 kg/min.

To calculate the specific humidity at the inlet and outlet, we need to determine the mass of water vapor and the mass of dry air.

Specific humidity at inlet = Pw / (Pa - Pw)

Pw = 0.736 kPa (calculated earlier)

Pa = 100.56 kPa (calculated earlier)

Specific humidity at outlet = Pw / (Pa - Pw)

Pw = 1.866 kPa (calculated earlier)

Pa = 99.43 kPa (calculated earlier)

Now we can calculate the rate of water added using the formula:

Rate of water added = mass flow rate of dry air x (specific humidity outlet - specific humidity inlet)

Rate of water added = 25 x (0.0193 - 0.0074) = 0.305 kg/min or 18.3 kg/h

Therefore, the rate of water added by the evaporative cooler is 0.305 kg/min or 18.3 kg/h.

d) Importance of Evaporative Cooler:

The evaporative cooler plays an important role in the air conditioning system because it adds moisture to the air. When hot and dry air enters the evaporative cooler, it passes through water-saturated pads that absorb moisture from the water and add it to the air. This process cools and humidifies the air, making it more comfortable to breathe. By increasing the relative humidity, the evaporative cooler helps to alleviate dryness and provides a more pleasant environment.

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Answer:

melting

Explanation:

the answer is D. The rain cycle says that Evaporation turns water into gas

amount of time the two substances are in contact. area in contact between the two substances. specific heat of the material that makes up the substances. the density of the two substances in contact.

The characteristics determine how easily two substances change temperature is amount of time the two substances are in contact, area of contact between the two substances, specific heat of the material that makes up the substances and the density of the two substances in contact. Therefore, option B, C, D and E are correct.

When two substances that have different surface temperatures come in contact, conduction happens. The substance with the higher temperature always transfers energy to the one with the lower temperature.

When two objects with different temperatures come in contact with one another, energy moves from the hotter (higher temperature) object to the cooler (lower temperature) object until both objects reach the same temperature.

The latitude of the location has an impact on the air temperature there. The location's elevation. separation from the ocean.

Thus, option B, C, D and E are correct.

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If the product contain succinimide, its IR spectra should show aprominent peak at around 1700 cm-1, indicating an incomplete reaction.

Because various elements have varying quantities of protons and varied numbers and configurations of electrons, they also have different spectra. The variations in spectra are a result of the energy that atoms absorb or emit as their electrons shift between different energy levels.

Every element generates an own collection of spectral lines. A line spectrum can be used to distinguish between different elements because no two produce the same spectral lines.

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E) 40.7 g Ar. The pressure of a gas is directly proportional to the number of moles of gas present. Therefore, if we want to decrease the pressure of the system by half, we need to reduce the number of moles of gas by half as well.

We need to use the Ideal Gas Law: PV=nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature. Since the pressure of Ar is half of Ne, we can set up a ratio:

(n_Ne/2) / n_Ar = (P_Ne/2) / P_Ar

Given the molar masses of Ne (20.18 g/mol) and Ar (39.95 g/mol), we can find the number of moles for Ne:

n_Ne = 41.1 g Ne / 20.18 g/mol = 2.04 mol Ne

Now, we can solve for n_Ar:

n_Ar = n_Ne/2 = 2.04 mol Ne / 2 = 1.02 mol Ar

Finally, convert n_Ar back to mass:

mass_Ar = 1.02 mol Ar * 39.95 g/mol = 40.7 g Ar

Your answer: E) 40.7 g Ar

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Answer:

One joule of work is defined as the amount of energy required to move an object one meter in the direction of the applied force. Work is a measure of the energy transfer that occurs when a force acts on an object and moves it over a distance.

A rotating fan and stretched rubber both contain kinetic energy and potential energy.

rotating fan has kinetic energy

Stretched rubber, on the other hand, has potential energy due to its elasticity.

Answer: this might have something to do with the pancreas

Explanation:

the pancreas produces insulin if subject a produces more insulin than subject b the reaction to the glucose will be different the pancreas breaks down the glucose into sugar and protiens hope this helps

Answer:

C

Explanation:

electronic waves transmits energy but mechanical waves require a medium in order to transport their energy from bgg one place to another.

Answer:

it is B.) Electromagnetic waves vibrate in two directions that are

Explanation:

stay safe 2021

Answer:

C?

Explanation:

I think it is C if not let me know i will help furthermore

Plz mark brainlyiest

The proteins that speed up chemical reactions in cells are known as enzymes. Enzymes act as biological catalysts by lowering the activation energy required for a chemical reaction to occur. They are highly specific in the reactions they catalyze and are able to function under mild conditions of temperature and pH.

Enzymes are proteins that speed up chemical reactions in cells. Enzymes act as biological catalysts by lowering the activation energy required for a chemical reaction to occur. They do this by bringing the reactants together in the correct orientation and in the correct proximity to each other. They are highly specific in the reactions they catalyze and are able to function under mild conditions of temperature and pH.The activity of an enzyme is affected by a number of factors, including temperature, pH, and the concentration of substrates and products. Enzymes are used in a wide range of industrial applications, including the production of food, pharmaceuticals, and chemicals. The study of enzymes is an important field in biochemistry and is essential for understanding many aspects of cell biology.

Enzymes are proteins that are essential for many biological processes. They speed up chemical reactions in cells by acting as biological catalysts, and they are highly specific in the reactions they catalyze. The study of enzymes is an important field in biochemistry and is essential for understanding many aspects of cell biology.

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Answer:

I think its B but i may be wrong

Explanation:

Sorry if im wrong!! Took that test but i dont rm the answer well enough to be for sure

The reaction is non-spontaneous

this is the correct answer

Answer:

The reaction has a high activation energy

Explanation:

The burning of methane is a spontaneous reaction. Once the burning begins, the flame is able to sustain itself without any additional input of energy. It is an exothermic reaction in which energy is given out in the form of heat.

The reason why heat from the match is needed to start the burning of methane is that the activation energy of the combustion of methane is high. Activation energy is the energy that must be supplied in order for the collision of reactants to result in chemical reaction.

As long as the activation energy is high, the reaction can not occur without an external input of energy (e.g striking a match). Hence the answer.

Answer: Solar eclipse

Explanation:

Answer:

We can not swim in 1.00 × 10²⁷ molecules of water

Explanation:

The given number of molecules of water = 1.00 × 10²⁷ molecules

The Avogadro's number, \(N_A\), gives the number of molecules in one mole of a substance

\(N_A\) ≈ 6.0221409 × 10²³ molecules/mol

Therefore

Therefore, we have;

The number of moles of water present in 1.00 × 10²⁷ molecules, n = (The number of molecules of water) ÷ \(N_A\)

∴ n = (1.00 × 10²⁷ molecules)/(6.0221409 × 10²³ molecules/mol) = 1,660.53902857 moles

The mass of one mole of water = The molar mass of water = 18.01528 g/mol

The mass, 'm', of water in 1,660.53902857 moles of water is given as follows;

Mass = (The number of moles of the substance) × (The molar mass of the substance)

∴ The mass of the water in the given quantity of water, m = 1,660.53902857 moles × 18.01528 g/mol ≈ 29.9150756 kg.

The density pf water, ρ = 997 kg/m³

Volume = Mass/Density

∴ The volume of the water present in the given quantity of water, v = 29.9150756 kg/(997 kg/m³) ≈ 30.0050909 liters

The volume of the water present in 1.00 × 10²⁷ molecules of water ≈ 30.0 liters

The average volume of a human body = 62 liters

Therefore, we can not swim in the given quantity of 1.00 × 10²⁷ molecules = 30.0 liters water

The lowest whole number ratio of atoms present in a compound is given by the most straightforward formula or empirical formula. This formula indicates the proportion of atoms of each element in the compound.

Let's start with the information provided in the issue, which is the weight in grammes of each constituent.

If percentages are provided, we'll assume that there is a total mass of 100 grammes, making each element's mass equal to the specified percentage.

Convert each element's mass to a mole by using its molar mass from the periodic table.

Multiply the lowest calculated number of moles by each mole value.

To the nearest entire number, round up. The mole ratio of the elements is indicated by subscripts in the empirical formula.

If the number is too large to round off, multiply each response by the same factor to obtain the lowest whole number multiple (x.1 – x.9).

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Answer:

Caffeine has no atomic number

Explanation:

Caffeine is a compound, not an element. Therefore it cannot have an atomic number.

Answer:

Lithospheric plates are regions of Earth's crust and upper mantle that are fractured into plates that move across a deeper plasticine mantle. Earth's crust is fractured into 13 major and approximately 20 total lithospheric plates.

Explanation:

I hope this helps

The correct option from the given statements concerning mixtures is (d) more than one correct response.

The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.

The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).

The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.

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Answer:

The stomach.

Explanation:

The vacuole is like the stomach because it stores food and water for later use. This allows the body and or cell to get energy when needed.

The final temperature, in degrees Celsius, of the gas is 34.62 °C

From the question, we are to determine the final temperature, in degrees Celsius

From the Pressure law or Gay-Lussac's law

We have that, for a given mass and constant volume of an ideal gas, the pressure exerted on the sides of its container is directly proportional to its absolute temperature.

Using the formula,

\(\frac{P_{1} }{T_{1}} = \frac{P_{2} }{T_{2}}\)

Where P₁ is the initial pressure

T₁ is the initial temperature

P₂ is the final pressure

and T₂ is the final temperature

From the given information,

P₁ = 739 mmHg

T₁ = 23 °C = 23 + 273.15 = 296.15 K

P₂ = 768 mmHg

T₂ = ?

Putting the parameters into the formula, we get

\(\frac{739}{296.15}=\frac{768}{T_{2} }\)

Then,

\(T_{2} = \frac{768 \times 296.15}{739}\)

T₂ = 307.77 K

Therefore,

T₂ = 307.77 - 273.15 = 34.62 °C

Hence, the final temperature, in degrees Celsius, of the gas is 34.62 °C

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Here is the complete question:

A gas sample has a pressure of 739 mmHg when the temperature is 23 °C. What is the final temperature, in degrees Celsius, when the pressure is 768 mmHg, with no change in the volume or amount of gas?

Evaporation occurs when a liquid turns into vapour . The particles in the liquid gain energy and move faster and further until some of them escape from the surface and become a vapour

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