Two kg of aturated aqueou olution of a highly oluble component A at 50 °C i cooled of A are (0. 5 kg 4)/(kgwater) at 50 °C and to 30 °C. The olubility of A (0. 3 kg 4)/(kgwater) at 30 °C. The amount in kg of the crytal formed i-----?
a) 1. 47 kg
b) 0. 57 kg
c) 0. 68 kg
d) 0. 07 kg

: PM2.5 is defined as the mass concentration of particles in the air less than or equal to 2.5 micrometers in diameter.Question 15: False, carbon dioxide (CO2) is not considered a criteria air pollutant.

Question 16: The closest answer is 50%, but the exact percentage is not provided in the question.Question 17: The term "photochemical smog" is most synonymous with ozone (O3), which is a criteria air pollutant.Question 18: True, attainment of ambient air quality standards requires that measured concentrations at all monitoring stations within an air district are below ambient air standards.

Question 14 asks about the definition of PM2.5. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 micrometers. It represents the mass concentration of particles suspended in the air, which are small enough to be inhaled into the respiratory system and can have adverse health effects.

Question 15 states whether carbon dioxide (CO2) is a criteria air pollutant. Criteria air pollutants are a set of pollutants regulated by environmental agencies due to their detrimental impact on air quality and human health. However, carbon dioxide is not considered a criteria air pollutant because it does not directly cause harm to human health or the environment in the same way as pollutants like ozone or particulate matter.

Question 16 asks about the percentage of carbon monoxide (CO) emissions from mobile sources in Santa Clara County. While the exact percentage is not provided in the question, the closest answer option is 50%. However, it is important to note that the precise percentage may vary depending on specific local conditions and emissions sources.

Question 17 inquires about the criteria air pollutant most synonymous with the term "photochemical smog." Photochemical smog is primarily associated with high levels of ground-level ozone (O3). Ozone is formed when nitrogen oxides (NOx) and volatile organic compounds (VOCs) react in the presence of sunlight, creating a hazy and polluted atmospheric condition.

Question 18 addresses the concept of "attainment" of ambient air quality standards. To achieve attainment, measured concentrations of pollutants at all monitoring stations within an air district must be below the established ambient air quality standards. This ensures that the air quality in the given area meets the required standards for protecting human health and the environment.

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The missing part of the equation is found to be 4/2He. Option A

The term nuclear equations have to do with the type of equation in which one type of nucleus is transformed into another sometimes by the bombardment or loss of a particle.

Now the full equation ought to be written as 7/3Li + 1/1H -----> 4/2He + 4/2He. This is because the total mass on the left is 8 and the total charge on the left is 4.

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The type of chemical reaction that occurs in the equation C6H12 + 9O2 → 6CO2 + 6H2O is combustion.

The given chemical equation represents the combustion of C6H12, which is a hydrocarbon compound, in the presence of oxygen (O2). Combustion is a type of chemical reaction in which a substance reacts with oxygen gas to produce heat and light. In this reaction, C6H12 reacts with O2 to form carbon dioxide (CO2) and water (H2O), releasing a large amount of energy in the form of heat and light. Combustion reactions are exothermic, meaning they release energy in the form of heat. They are often used as a source of energy in various applications, including combustion engines and power plants.

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The required volume flow rate of liquid ethyl alcohol to supply at a rate of 2000 kJ/s is approximately 164.9 L/min.

To determine the required volume flow rate of liquid ethyl alcohol, we need to calculate the fuel flow rate first. Then, we can convert it to volume flow rate.

Given:

Rate of energy release (Q) = 2000 kJ/s

Excess air = 40% (or 0.4)

First, let's calculate the fuel flow rate (m f):

Q = m f × Lower Heating Value (LHV)

The Lower Heating Value (LHV) for ethyl alcohol can be calculated using the enthalpy of vaporization:

LHV = enthalpy of vaporization / molecular weight of fuel

LHV = 42,340 kJ/k mol / 46.07 kg/k mol = 920.11 kJ/kg

Now, we can calculate the fuel flow rate:

m f = Q / LHV

m f = 2000 kJ/s / 920.11 kJ/kg ≈ 2.173 kg/s

Next, let's convert the fuel flow rate to volume flow rate:

Volume flow rate (V f) = m f / density

V f = 2.173 kg/s / 790 kg/m³ = 0.002749 m³/s

Finally, we can convert the volume flow rate to L/min:

V f = 0.002749 m³/s × (1000 L/1 m³) × (60 s/1 min) ≈ 164.9 L/min

Therefore, the required volume flow rate of liquid ethyl alcohol to supply at a rate of 2000 kJ/s is approximately 164.9 L/min.

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Answer:

1.A 2.C 3.B

4. d

Explanation:

Answer:

Aquatic life

Elevation

Salinity

Temperature

Explanation:

Aquatic life- animals living in water use up dissolved oxygen.

Elevation- the amount of oxygen in elevation increases.

Salinity- Salty water holds less oxygen than fresh water.

Temperature- cold water holds more dissolved oxygen than warm water.

The balanced half-reaction describing the reduction of solid diiodine (I2) to aqueous iodide anions (I-) can be represented as follows:

I2 + 2e- -> 2I-

In this half-reaction, two electrons (2e-) are added to diiodine (I2), resulting in the formation of two iodide anions (2I-). This reduction process involves the gain of electrons by diiodine, leading to the conversion of neutral diiodine molecules to negatively charged iodide ions.

The balanced equation illustrates that for every molecule of diiodine (I2) reduced, two iodide anions (I-) are formed. The transfer of electrons from the reducing agent (in this case, the diiodine) to the oxidizing agent results in the formation of the reduced species (iodide ions).

It is important to note that this is only a half-reaction, and the overall redox reaction would require a corresponding oxidation half-reaction to complete the balanced equation. The reduction half-reaction described above represents the reduction of diiodine to iodide ions.

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The theoretical characteristic exhaust velocity, c* is 2850.7 m/s, and specific impulse Isp is 2556.5s for this new engine.

Using the following formula, the theoretical typical exhaust velocity, c*, can be determined:

sqrt(2 * * R * Tc / M) = c*.

where Tc is the combustion temperature in Kelvin, M is the molecular mass of the combustion products, and is the ratio of specific heats. R is the universal gas constant (8.314 J/mol.K).

Inputting the values provided yields:

c*= sqrt(2 * 1.225 * 8.314 * 3415 / 21.79), which equals 2850.7 m/s.

The following formula can be used to determine the particular impulse, Isp:

Isp equals c* * ln(m0/mf).

where the rocket's beginning mass is m0 and its ultimate mass, after the propellant has been burned, is mf.

Let's suppose that the mass ratio of the rocket to the propellant is 3:1 since we don't know the rocket's mass. The mass of propellant would then equal 3/4 of the rocket's original mass.

As a result, we get:

Isp = 2556.5 * ln(m0 / (3/4 * m0)) = 2850.7 * ln(4/3)

Therefore, the particular impulse, Isp, is 2556.5 s, and the predicted typical exhaust velocity, c*, is 2850.7 m/s.

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Answer:

Explanation:

1 mol of Aluminum = 26.98 grams

550 mol of Aluminum = x

1 * x = 550 * 26.98

x = 14839 grams

Answer:

omg

Explanation:

omg omg omg omg omg omg omg omg omg omg I can't either ehhhhhh

Answer:

To use the Clausius-Clapeyron equation, we need to know two sets of conditions for the substance in question. Let's start with question 1:

Question 1:

Given:

Enthalpy of vaporization, ΔHvap = 35.2 kJ/mol

Vapor pressure at T1 = 1 atm (or 760 torr), T1 = 64.7°C

We want to find: Vapor pressure at T2 = 41.9°C

First, we need to convert temperatures to Kelvin:

T1 = 64.7 + 273.15 = 337.85 K

T2 = 41.9 + 273.15 = 315.05 K

Now we can use the Clausius-Clapeyron equation:

ln(P2/P1) = -ΔHvap/R * (1/T2 - 1/T1)

where P1 and P2 are the vapor pressures at temperatures T1 and T2, respectively, R is the gas constant (8.314 J/mol·K), and ln is the natural logarithm.

Solving for P2, we get:

P2/P1 = e^(-ΔHvap/R * (1/T2 - 1/T1))

P2 = P1 * e^(-ΔHvap/R * (1/T2 - 1/T1))

Substituting the given values, we get:

P2 = 1 atm * e^(-35.2 kJ/mol / (8.314 J/mol·K) * (1/315.05 K - 1/337.85 K))

P2 = 0.496 atm

Rounding to three decimal places, the vapor pressure of methanol at 41.9°C is 0.496 atm.

Answer: 0.496 atm

Question 2:

Given:

Enthalpy of vaporization, ΔHvap = 27.5 kJ/mol

Vapor pressure at T1 = 760 torr, T1 = 34.6°C

We want to find: Vapor pressure at T2 = 0.1°C

Converting temperatures to Kelvin:

T1 = 34.6 + 273.15 = 307.3 K

T2 = 0.1 + 273.15 = 273.25 K

Using the Clausius-Clapeyron equation:

ln(P2/P1) = -ΔHvap/R * (1/T2 - 1/T1)

Solving for P2, we get:

P2/P1 = e^(-ΔHvap/R * (1/T2 - 1/T1))

P2 = P1 * e^(-ΔHvap/R * (1/T2 - 1/T1))

Substituting the given values, we get:

P2 = 760 torr * e^(-27.5 kJ/mol / (8.314 J/mol·K) * (1/273.25 K - 1/307.3 K))

P2 = 7.25 torr

Rounding to one decimal place, the vapor pressure of dimethyl ether at 0.1°C is 7.3 torr.

Answer: 7.3 torr

The coefficient of Fe would be 2, the coefficient of Cl2 would be 3, while the coefficient of FeCl2 would be 2.  

The balanced equation of the reaction would be as follows:

\(2Fe(S) + 3Cl_2 ---> 2FeCl_3(S)\)

Thus, the coefficients of Fe, Cl2, and FeCl3 respectively would be 2, 3, and 2.

In other words, 2 moles of Fe require 3 moles of Cl2 to produce 2 moles of FeCl3 in a complete reaction.

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Answer:

wow ok have fun

Explanation:

Answer:

hiiiiiiiii

Explanation:

thank you

Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

Answer:

na+then mg2+ then al3+

Explanation:

this is due to the distance between their nucleus and valence electron

279.448 kJ/mol is ΔH∘(rxn) for the given reaction. An attribute or state function that mimics energy is enthalpy.

The entire internal energy of a thermodynamic system is known as enthalpy, which is also known as the volume-to-pressure ratio. It has the same dimensions as energy and therefore can be expressed in joules or ergs. The value of enthalpy is solely dependent on the pressure, temperature, and chemical makeup of the system, not on its history.

Cr\(_2\)O\(_3\)(s)= -1128.4 kJ/mol

CO (g)=-110.525 kJ/mol

Cr (s)=0 kJ/mol

CO\(_2\) (g)=-393.509 kJ/mol

ΔH∘(rxn) = ΔH∘(products) - ΔH∘(reactants)

ΔH∘(rxn) = ΔH∘(products) - ΔH∘(reactants)

(2×0) + (3×-393.509) = -1,180.527 kJ/mol=ΔH∘(products)

(1×-1128.4) + (3×-110.525) = -1,459.975 kJ/mol=ΔH∘(reactants)

ΔH∘(rxn) = -1,180.527 - (-1,459.975) = 279.448 kJ/mol

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Answer:

During sexual reproduction the genetic material of two individuals is combined to produce genetically diverse offspring that differ from their parents. The genetic diversity of sexually produced offspring is thought to give species a better chance of surviving in an unpredictable or changing environment.

A buffer of 300 ml of 100 mM Tris pH 7.8 and 250 mM NaCl can be prepared by dissolving 3.64 g of Tris and 4.27 g of NaCl in 300 ml of water, and adjusting the pH to 7.8 using 10 ml of 1 M HCl. The % v/v refers to the volume of the solute while % w/v refers to the weight of the solute.

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The correct question would be as

How do you prepare 300 ml buffer of 100 mM Tris pH 7.8 and 250 mM NaCl? % v/v,% w/v Questions.

The pressure of the gas inside the canister can be determined using the ideal gas equation. The pressure inside the canister is 126.7 atm.

Ideal gas equations states the relation between volume, pressure, temperature and number of moles of gas as written below:

PV = nRT.

Where R is the universal gas constant equal to 0.082 L atm/K mol.

Given the volume of the tank  V = 1 L

number of moles n = 2 moles

temperature = 500 ° C = 773 k

Then pressure P = nRT/V.

Pressure of  gas = 2 moles ×773 K× 0.082 L atm/K mol /(1 L)

P = 126 atm.

Therefore, the pressure of the gas in the canister is 126 atm.

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Answer:

sublimation:heat taken in

condensation:heat given out

evaporation:heat taken in

boiling:heat taken in

melting:heat taken in

freezing:heat given out

Processes listed can be classified into two groups based on whether heat is taken in or given out by the particles.Heat is taken in melting,evaporation, sublimation while heat is given out in boiling,condensation and freezing.

Heat taken in by the particles:

1. Sublimation: This process occurs when a substance changes from a solid directly to a gas without passing through the liquid phase. Heat is absorbed to break the intermolecular forces holding the particles in the solid phase.

2. Evaporation: This process happens when a liquid changes into a gas at temperatures below its boiling point. Heat is absorbed from the surroundings to overcome the intermolecular forces between the liquid particles.

3. Melting: Melting occurs when a solid substance changes into a liquid. Heat is absorbed to break the intermolecular forces holding the particles in the solid phase.

Heat given out by the particles:

1. Condensation: Condensation occurs when a gas changes into a liquid. Heat is released to the surroundings as the gas particles lose energy and come together to form liquid droplets.

2. Boiling: Boiling is the process where a liquid changes into a gas throughout its entire volume. Heat is released to the surroundings as the liquid particles gain energy and escape the liquid phase.

3. Freezing: Freezing is the process where a liquid changes into a solid. Heat is released to the surroundings as the liquid particles lose energy and arrange themselves into a regular pattern.

Thus, heat is taken in melting,evaporation, sublimation while heat is given out in boiling,condensation and freezing.

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Answer:

A small positively charged nucleus surrounded by revolving negatively charged electrons in fixed orbits

Answer:

magnesium sulfate + water + carbon dioxide

Explanation:

The bond angles in SF₅⁺ are expected to be 90°, 120°, and 180°.

The correct option is E.

Bond angles refer to the angles between the bond linking the atoms of elements in a compound or ion.

The bond angles exist as a result of either electrical repulsion between the electrons in the bonds.

The ion SF₅⁺ contains one atom of sulfur and five atoms of fluorine linked together by covalent bonds. The shape of the ion or the molecular geometry is square pyramidal. Hence, the bond angles are 90°, 120°, and 180°.

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Answer: Mg and Ca

Explanation:

In the modern periodic table, Mg and Ca are the last pair of elects for which Newlands' Law of Octaves would hold true.

Law of Octaves is the generalization that was made by Newlands. It states that when chemical elements are arranged based on their increasing atomic weight, then the ones that have the same chemical and physical properties will occur after an interval of seven elements.

In such a case, every eighth element will have identical properties when the elements in the periodic table are arranged based on their atomic masses.

Based on the above information, Magnesium (Mg) has an atomic number of 12 while Calcium (Ca) has an atomic number of 20. Therefore, the elements follow the law of Octaves as they have a difference of 8 in their atomic numbers.

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The statement "molecules move in random directions when heated in a heat engine, and because of the lack of uniformity in the direction of molecular movement" is true.

When a heat engine is heated, molecules absorb heat energy and their kinetic energy increases. The kinetic energy of molecules causes them to move around. However, this movement is not uniform, and the molecules move in random directions.

A heat engine is a device that converts thermal energy into mechanical energy. Heat engines operate on the principle of thermodynamics.

They work by taking in thermal energy from a high-temperature reservoir, converting some of it into mechanical energy, and then releasing the remaining thermal energy to a low-temperature reservoir.The internal combustion engine in a car, the steam engine in an old locomotive, and the turbine in a power plant are all examples of heat engines. They all convert heat energy into mechanical energy to perform work.

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