The si system unit for the amount of a substance is.

As per the given problem, 400 kg of a solution containing 35 wt % acetic acid in water is contacted with 400 kg of pure isopropyl ether. We need to calculate the amounts and compositions of the extract and raffinate layers, and the percentage of acetic acid removed.

Using the lever-arm rule, we can determine the amounts of the extract and raffinate layers. Since the two solvents are being mixed in equal quantities, the total weight of the system is 800 kg. The lever arm for the isopropyl ether is 1, and for the acetic acid/water solution is (0.35/0.65) = 0.538. Therefore, the weight of the extract can be calculated as (1/1.538) × 400 kg = 259.97 kg, and the weight of the raffinate can be calculated as (0.538/1.538) × 400 kg = 140.03 kg.

To determine the compositions of the extract and raffinate layers, we use the lever-arm rule and the equilibrium data from Appendix A.3. For the extract layer, the lever-arm for isopropyl ether is 1, and for acetic acid, it is (0.90/0.10) = 9. Therefore, the weight percent of acetic acid in the extract layer is (1/10) × 35% = 3.5%. Similarly, for the raffinate layer, the lever arm for isopropyl ether is 0, and for acetic acid, it is (0.04/0.96) = 0.042. Therefore, the weight percent of acetic acid in the raffinate layer is (0.042/1.042) × 35% = 1.48%.

To determine the percentage of acetic acid removed, we need to calculate the amount of acetic acid that remains in the raffinate layer. The weight of acetic acid in the original solution is 0.35 × 400 kg = 140 kg. The weight of acetic acid in the raffinate layer is 0.0148 × 140.03 kg = 2.07 kg. Therefore, the amount of acetic acid removed is 140 kg - 2.07 kg = 137.93 kg. The percentage of acetic acid removed is (137.93 kg/140 kg) × 100% = 98.52%.

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The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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Type of reinforcement schedule is Variable-ratio.

A type of operant conditioning called a variable-ratio reinforcement schedule gives rewards after a varied number of answers. It has been discovered that this schedule, which is frequently utilised in gambling, is most efficient at generating the strongest and most resistant behaviour. The best response rates and greatest resistance to extinction are produced by variable-ratio regimens. This happens because the subject exhibits persistent behaviour for prolonged lengths of time since they are unsure of when they will receive reinforcement. A person learns more quickly and effectively when the reward is unpredictable since it keeps them motivated and interested.

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Answer:

The two correct statements about the molecules of butane gas in the cylinder are:

- Further apart than those in the liquid

- The gas molecules exert a pressure on the inside of the cylinder.

The moving molecules cause this pressure because they collide with the walls of the cylinder and exert a force on them, creating a pressure. More collisions per unit time mean a higher pressure.

Explanation:

Answer:

thank you for this oibnki

Answer:

Sure I'll go ahead and like your answers and follow you if that's what you wanted! :)

Explanation:

False.

Radiation itself does not typically have a green glow, intense heat, crackling sound, or ammonia smell. These descriptions do not accurately represent the properties of radiation.

The emission of energy in the form of particles or electromagnetic waves is referred to as radiation. Our senses cannot immediately notice it. Radiation is measured and detected using specialized apparatus and detectors.

Alpha particles, beta particles, gamma rays, and X-rays are a few examples of different forms of radiation that have unique characteristics and may be identified with the right tools. For instance, ionizing radiation is typically detected using Geiger-Muller counters or scintillation detectors, whereas radiation exposure is measured using dosimeters.

For precise radiation risk identification and protection, it's crucial to rely on the right detection tools and follow safety procedures.

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To answer your question, in the electrolysis of a molten mixture of RbF and CaCl2, the product that forms at the negative electrode is Rb metal and F2 gas.

To answer your question, in the electrolysis of a molten mixture of RbF and CaCl2, the product that forms at the negative electrode is Rb metal and F2 gas. This is because the negative electrode, also known as the cathode, attracts positively charged ions, which in this case is Rb+. The Rb+ ions are reduced by gaining electrons from the cathode and form Rb metal. At the same time, the F- ions in the molten mixture are also attracted to the cathode, and they gain electrons to form F2 gas.
On the other hand, the product that forms at the positive electrode, also known as the anode, is Cl2 gas and Ca metal. This is because the positive electrode attracts negatively charged ions, which in this case is Cl-. The Cl- ions are oxidized by losing electrons at the anode to form Cl2 gas. At the same time, the Ca2+ ions in the molten mixture are also attracted to the anode, and they lose electrons to form Ca metal.
It is important to note that in electrolysis, the cathode is the electrode where reduction occurs, while the anode is the electrode where oxidation occurs. Electrodes are conductive materials that allow the flow of electricity and are used in electrolysis to transfer electrons between the solution and the power source.

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Charles law states that there is a directly proportional relationship between the volume and the temperature of the gas at certain pressure.

Therefore,

V1/T1 = V2/T2

V1 is unknown

T1 = 159K

V2 = 15.5m3

T2 = 456K

V1/159 = 15.5/456

V1 = (15.5*159)/456 = 5.404m3.

When the volume of a gas is changed from 5.404 m3 to 15.5 m3 the temperature will change from 159 K to 456 K.

'The particles in all states of matter, including liquids, have Kinetic energy.

Kinetic energy is the energy possessed by an object due to its motion. It is the energy associated with the movement of an object. Kinetic energy is related to the object's mass and velocity and is calculated by using the mass of the object and its velocity.

Therefore, with this data, we can see that Kinetic energy is motion energy and it depends on the mass and velocity of a given object in a period of time.

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Answer:

C

Explanation:

There are 5 valence electrons

Answer:

5

Explanation:

simply add exponents of the highest energy level (the big number in the front says what energy level it is in)

The percent of s character of the hybrid oxygen orbital in water is 25%.

The oxygen atom in water undergoes sp3 hybridization, which means that its three 2p orbitals and one 2s orbital combine to form four hybrid orbitals.

These hybrid orbitals are oriented towards the corners of a tetrahedron and have a mixture of s and p character.

The hybrid orbitals in water are often referred to as sp3 hybrid orbitals, which suggests that they have 25% s character and 75% p character.

However, this is an oversimplification, as the hybrid orbitals in water have a more complex wave function that cannot be described by a single percentage value.

The hybridization of the oxygen atom in water involves the combination of the 2s orbital and three 2p orbitals of the oxygen atom.

The resulting hybrid orbitals are called sp3 hybrid orbitals because they are made up of one s orbital and three p orbitals, which combine to form four hybrid orbitals that are oriented tetrahedrally around the oxygen atom.

The sp3 hybrid orbitals have a mixture of s and p character. This means that they are not purely s orbitals or purely p orbitals, but rather a combination of both.

The amount of s and p character in each hybrid orbital depends on the exact geometry of the molecule and the particular hybridization scheme.

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Answer:

Nitrogen is a naturally occurring element that is essential for growth and reproduction in both plants and animals. It is found in amino acids that make up proteins, in nucleic acids, that comprise the hereditary material and life's blueprint for all cells, and in many other organic and inorganic compounds.

Explanation:

Amino acids and nucleic acids are both monomers containing nitrogen​ is a true statement as both monomers have nitrogen in them.

There are four major macromolecules that are used by the body of an organism that helps in getting energy and growth and development of the organism.

1. The building blocks of DNA or nucleic acid are nucleotides:

2. Amino acids are the building blocks of proteins:

Thus, the correct answer is - true.

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Answer:

569K

Explanation:

Q = 3.5kJ = 3500J

mass = 28.2g

∅1 = 20°C = 20 + 273 = 293K

∅2 = x

c = 0.449

Q = mc∆∅

3500 = 28.2×0.449×∆∅

3500 = 12.6618×∆∅

∆∅ = 3500/12.6618

∆∅ = 276.4220

∅2 - ∅1 = 276.4220

∅2 = 276.4220 + ∅1

∅2 = 276.4220 + 293

∅2 = 569.4220K

∅2 = 569K

When the temperature is increased, there is the increase in thermal energy of the system. The final temperature of the iron in kelvins is 570 K.

The energy is the ability to do work.

Given is the energy Q = 3.5 kJ = 3500 J, mass of sample m = 28.2 g, specific heat of iron Cp = 0.449 J(g•K).

The initial temperature in kelvins is T1 = 20°C = 20 + 273 = 293K

The heat is related to the temperature difference as

Q = m c ∆T

Substitute the values into the expression,

3500 = 28.2 × 0.449 × ∆T

3500 = 12.6618 × (T2 -T1)

T2 - T1 = 276.4220

T2 = 276.4220 K +293 K

T2 = 569.4220K

The temperature of the iron is approximately 570 K.

Thus, the final temperature of the iron in kelvins is 570K.

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Answer:

falso

Explanation:

tiempo no determinado El circulation de elctrones

Answer:

5.54mL = V2

Explanation:

V1 = 11.5mL

T1 = 415k

T2 = 200k

V2 = ?

\(\frac{V1}{T1 } = \frac{V2}{T2 }\)  so this means \(\frac{11.5}{415} = \frac{V2}{200 }\) then you cross multiply

(11.5)(200) = (415)(V2)

2300 = 415 x V2

then you have to divide

\(\frac{2300}{415} = \frac{415+V2}{415}\)  

then you cross out the 415 from the top and bottom of second part so its not there so it would be \(\frac{2300}{415 } = V2\)

then divide

\(\frac{2300}{415 } = V2\)  so V2 = 5.54mL (mL bc thats the only volume in the equation)

If four years is the one-third total time of decay of a radioactive material then the half-life of that substance is six years.

Elements such as thorium, radium, and uranium have a high atomic number and emit invisible, high radiation of very high energy. This property of these elements is called radioactivity. Three types of radiation released by radioactive materials are alpha, beta, and gamma radiation.

The time interval in which the mass of radioactive materials or the number of atoms is reduced to half its original shape is known as the half-life of that material. When it decays, a radionuclide changes into a different atom decay product.

So we can conclude that the given radioactive substance will take about one to two years to get decay.

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Answer:

Due to the difference in the relative atomic masses and therefore, the molecular masses of Zn and Pb, one mole of Zn is about 3.2 times lighter than one mole of Pb

Explanation:

From the periodic table, we have;

The atomic number of zinc, Zn = 30

The atomic mass of zinc, Zn = 65.38 amu

The molar mass of zinc, Zn = 65.38 g/mol

The atomic number of lead, Pb = 82

The atomic mass of lead, Pb = 207.2 amu

The molar mass of lead, Pb = 207.2 g/mol

Therefore, whereby equal number of moles of Zn is lost and Pb is gained, we have;

Mass of 1 mole of Zn = 65.38 grams

Therefore, 1 gram of Zn = 1/65.38 moles = 0.0153 moles

0.12 grams of Zn = 0.12×0.0153 = 0.00184 moles of Zn

Given that equal number of moles of Zn and Pb are involved in the reaction, the number of moles of Pb gained = 0.00184 moles

The mass of Pb gained = Number of moles of Pb gained × Molar mass of Pb

The mass of Pb gained = 0.00184 × 207.2 = 0.38 g ≈ 0.4 g.

Amount of Pb gained = 0.43 g ≈ 0.4 g

Answer: \(2168 ^{\circ} \text{C}\)

Explanation:

For this question, we can use the formula \(Q=mc \triangle T\), where \(Q\) is the amount of heat absorbed, \(m\) is the mass of the sample, \(c\) is the specific heat constant, and \(\triangle T\) is the change in temperature (final temperature minus initial temperature as stated in the question).

From the question, we know that \(m=175, Q=1.57 \times 10^{6}\). Furthermore, we know that \(c=4.18\) (this is just a fact).

So, we get that \(1.57 \times 10^{6}=175(4.18)(\triangle T)\), meaning \(\triangle T=2146\).

Thus, \(t_{f}-22.0=2146 \longrightarrow t_{f}=\boxed{2168 ^{\circ} \text{C}}\)

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

What is pressure?

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Various units are used to express pressure. Some of these are units of force divided by units of area. For example, the SI unit of pressure, Pascal (Pa), is 1 Newton per square meter (N/m2). Similarly, pounds force per square inch (psi, symbol lbf/in2) is the traditional unit of pressure in imperial and US systems. Pressure can also be expressed as standard atmospheric pressure. Atmospheric pressure (atm) is equal to this pressure and torr is defined as 1/760 of this. Manometric units such as centimeters of water, millimeters of mercury, and inches of mercury are used to express pressure as the height of a particular liquid column within a manometer.

If the balloon is closed, then yes, both volume and pressure will increase when the gas inside is heated.

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Explanation:

A and D. the answer is a and d

Answer:

A location that is humid, would most likely support a marsh ecosystem.

Explanation:

The Florida Everglades are an example of a marsh :)

"Marshes are a type of wetland ecosystem where water covers the ground for long periods of time. Marshes are dominated by herbaceous plants, such as grasses, reeds, and sedges."

Answer:

Identify arrows pointing to bonding electrons.

✔ a, b, d

Identify arrows pointing to nonbonding electrons.

✔ c

Identify arrows pointing to structures containing sigma bonds.

✔ a, b, d

Identify arrows pointing to structures containing pi bonds.

✔ a

Explanation:

Answer:

1) option c 2) c 3) option b 4) a

Explanation:

Answer:

a. phisical change

Explanation:

Answer:

A

Explanation:

Answer:

B.) 117 g

Explanation:

(Step 1)

To find the mass, you need to first find the moles of NaCl using the molarity  ratio.

Molarity = moles / volume (L)

2.00 M = moles / 1.0 L

2.00 = moles

(Step 2)

Now that you know the moles, you can convert it to grams using the molar mass.

Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol

Molar Mass (NaCl): 58.443 g/mol

2.00 moles NaCl          58.443 g
---------------------------  x  -----------------  =  117 g NaCl
                                        1 mole

The time taken for the isotope of the sample element having a half life of 27.7 days to decay from its 600 g sample to 75 g is 36.09 days.

Radioactive decay is a nuclear reaction by which an unstable nuclei will undergo emission of charged particles such as alpha, beta, gamma.

By this process unstable nuclei will form their stable isotope or other new atoms. The decay constant k for the nuclear reaction is calculated from the half life time as below:

decay constant = 0.693 /27.7 days

                          = 0.025 days-1

Now the time taken for the decay of 600 g of the sample to 75 g is calculate as follows:

t = 1/(0.025) log (600/75)

  = 36.09 days

Hence,  time taken for the isotope of the sample element having a half life of 27.7 days to decay from its 600 g sample to 75 g is 36.09 days.

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When 4.72 g of carbon react with excess oxygen gas to produce carbon dioxide, 609.6 kJ of energy will be released

This is because the reaction between carbon and oxygen is exothermic, meaning that energy is released when the reaction takes place.

For carbon, the energy released per mole is 717 kJ. For oxygen, the energy released per mole is 498 kJ.

The total energy released in the reaction, you need to multiply the energy released per mole by the number of moles of each element present in the reaction.

In this reaction, 4.72 g of carbon and excess oxygen are present. The atomic mass of carbon is 12.0107 g/mol, which means that 0.3948 moles of carbon are present in 4.72 g.

The atomic mass of oxygen is 15.999 g/mol, which means that 6.26 moles of oxygen are present.

Multiplying the energy released per mole of each element by the number of moles present in the reaction yields the total energy released.

This is equal to 717 kJ/mol x 0.3948 mol = 282.3 kJ, and 498 kJ/mol x 6.26 mol = 3127.48 kJ.

Adding these two values together gives the total energy released in the reaction,

which is equal to 3127.48 kJ + 282.3 kJ = 3409.78 kJ. Since 1 kJ = 1000 J, the total energy released in this reaction is 3409.78 kJ = 3.40978 x 10^6 J.

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Kinetic molecular theory states that there is no attractive and repulsive force between the gas molecules. So option (3) is false.

According to the kinetic molecular theory the gases are composed of a large number of particles that behave like hard, spherical objects in a state of constant which is in random motion. This theory states that the energy that an object has because of its motion. The Kinetic Molecular Theory can be explained as the forces between molecules and the energy that they possess. This is explained as a theoretical model which describes the molecular composition of the gas in terms of a large number of submicroscopic particles that includes atoms and molecules. This states that the gas pressure arises due to particles colliding with each other and the walls of the container.

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The complete question is,

Which of the following statements about the kinetic-molecular theory of gases is false?

1. the average kinetic energy of a gas molecule is independent of the temperature.

2. collisions between molecules are elastic.

3. Attractive and repulsive forces are present between gas molecule.