24. Under what conditions are AH and AU for a reaction involving gases and/or liquids or solids equal? (1) AH = AU if all reactants and products are in their standard reference states (2) AH = AU if the change in the number of moles of gaseous species in the reaction is zero. (3) AH = AU if all reactants and products are liquids or solids because, to a good approximation, the volume does not change as a result of the reaction (a) Only (1) and (2) (d) All (1), (2), and (3) (b) Only (2) and (3) (e) None of those are necessary (c) Only (1) and (3) 25. Why are activity coefficients calculated using the Debye-Hückel limiting law always less than one? (a) Because the law does not consider the net electrostatic interaction among ions. (b) Because according the law ions form associates. (c) Because the net electrostatic interaction among ions surrounding an arbitrarily chosen central ion is attractive rather than repulsive. (d) Because the net electrostatic interaction among ions surrounding an arbitrarily chosen central ion is repulsive rather than attractive. (e) Activity coefficients calculated using the Debye-Hückel limiting law can actually be > 1

Answer:It is a gas because its particles move in many different directions.

Answer:

C - It is not a gas because its particles do not have large space between them.

Explanation:

correct on edg 2020 <3

A scientists is scientific knowledge established through direct observation and remains constant. Scientific knowledge can change with facts and conduct of experiment.

Scientific theories that have been accepted for a long time may change throughout time. Changes in societal, political, or religious ideas could occur together with new scientific discoveries. To obtain a deeper understanding, students should perform historical research on the era when scientific theories were developed.

Observations and supporting data are the basis of scientific understanding. It could change as new facts and observations are discovered. Examining recent discoveries will advance science.

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Answer:

Pascal (1 N/m²) (Pa) 101,325 Pa = 1 atm.

Pounds per square inch (psi) 14.7 psi = 1 atm.

Torr (1 mmHg) 760 torr = 1 atm.

Inches of Mercury (in Hg) 29.92 in Hg = 1 atm.

Atmosphere (atm) 1 atm = 1 atm.

Hope this helps :)

Pls brainliest...

A home heating system typically includes two other feedback control systems: thermostat control and water heater control.

Thermostat control is a widely used feedback control system in residences to regulate indoor temperature. It consists of a sensor, actuator, and controller. The sensor, usually a thermometer, measures the ambient temperature in the living space. The controller compares the measured temperature with the desired setpoint and determines if heating or cooling is required. The actuator, typically a furnace or air conditioning unit, adjusts the heating or cooling output based on the controller's instructions. Once the ambient temperature reaches the setpoint, the controller signals the actuator to stop heating or cooling, maintaining a comfortable temperature in the residence.

Another common feedback control system found in residences is the water heater control. This system ensures the water temperature is maintained at a desired level. The sensor, often a thermostat, measures the temperature of the water in the heater. The controller compares the measured temperature with the desired setpoint. If the water temperature falls below the setpoint, the controller activates the actuator, such as a heating element, to raise the water temperature. Once the desired temperature is reached, the controller instructs the actuator to stop heating, ensuring a constant supply of hot water for various household needs.

Overall, both thermostat control and water heater control systems in residences rely on sensors to measure relevant parameters, controllers to compare the measured values with desired setpoints, and actuators to adjust the heating or cooling output or water temperature accordingly. These feedback control systems play crucial roles in maintaining comfort and convenience in households.

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Answer:

NH4

Explanation:

Answer:

C

Explanation:

Mitochondria provides energy (ATP) for cells to use

Nucleus provides genetic code (DNA)

Ribosomes assemble amino acids chains based on the DNA from nucleus to form proteins

Answer:

c

Explanation:

Answer:

When deionized water is electrolyzed, it has a very low conductivity, which means that it does not conduct electricity well. This is because there are no ions (charged particles) present in deionized water to carry an electrical charge.

By adding Na₂SO4 (sodium sulfate) to the deionized water, the chemist is introducing ions into the solution. Na₂SO4 dissociates into sodium ions (Na+) and sulfate ions (SO4 2-) in water. These ions increase the conductivity of the water, allowing for the flow of electric current during the electrolysis process.

Additionally, Na₂SO4 serves as an electrolyte that helps to transfer electrons between the electrodes during the electrolysis process. Without an electrolyte, the electric current would not be able to flow through the water, and electrolysis would not occur.

Therefore, the purpose of adding Na₂SO4 to deionized water is to increase its conductivity and serve as an electrolyte to facilitate the electrolysis process.

When an object of mass mo is released from rest above the spring, it falls and then makes contact with the top of the spring with a speed v0. The spring then compresses such that the object reaches a position x0 below the spring’s equilibrium position, where the object comes to rest. The object is then directed upward by the spring until it is no longer in contact with the spring. The object then continues upward. The object-spring-earth system has zero gravitational potential energy at the instant shown in figure 2. All frictional forces are considered to be negligible.

According to the law of conservation of mechanical energy, the sum of kinetic and potential energies in the system should be constant. Thus, when the object falls, it loses gravitational potential energy and gains kinetic energy. The kinetic energy gained is given as1/2 mo v0^2Where mo is the mass of the object, and v0 is the speed with which the object comes in contact with the spring. When the spring is compressed to x0 below its equilibrium position, the kinetic energy is converted into the spring potential energy, which is given as1/2 k0 x0^2Where k0 is the spring constant, and x0 is the displacement of the spring from its equilibrium position. The spring potential energy is at its maximum value when the spring is fully compressed and the object comes to rest.At this point, all the kinetic energy has been converted into spring potential energy. The object then starts moving upward. At the point where the spring has been fully extended, the object's potential energy is at its maximum value. However, since all the kinetic energy has been converted into spring potential energy, the object's potential energy is equal to the spring potential energy at the point where the spring is fully compressed and the object comes to rest.The object's potential energy is given bymghWhere m is the mass of the object, g is the acceleration due to gravity, and h is the height above some arbitrary reference level.

Thus, the spring potential energy when the spring is fully compressed is equal to the object's potential energy when it reaches its maximum height above the equilibrium position. The initial kinetic energy of the object is equal to the sum of the maximum potential energy of the spring and the maximum potential energy of the object.

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Answer:

C) creating a relationship between mass and volume

g/L

g or gram is mass

L or Litres is for volume

The empirical formula, which represents the simplest ratio of atoms in a compound, may be useful in the lab setting but not useful for predicting the properties and functions of materials.

In the lab, the empirical formula can be useful for identifying the composition of a compound, especially if the molecular formula is unknown. It can also help in determining the stoichiometry of a reaction, which can be important for conducting experiments. However, the empirical formula does not provide information about the actual number of atoms or the arrangement of atoms within a molecule, which can greatly affect the properties and functions of a material.

Therefore, while the empirical formula can be a useful tool in the lab setting, it may not be sufficient for predicting the properties and functions of materials. More detailed information about the molecular formula and structure is needed for accurate predictions.

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Answer:

481.6x10^23

Explanation:

Answer:

\(\boxed {\boxed {\sf About \ 4.82 *10^{24} \ atoms \ K_2CrO_4}}\)

Explanation:

To convert from moles to atoms, Avogadro's Number must be used.

This number tells us how many particles (atoms, molecules, ions. etc.) in 1 mole of a substance. In this case, it is atoms of potassium chromate (K₂CrO₄) in 1 mole.

\(6.022*10^{23} \ atoms \ K_2CrO_4 / 1 \ mol \ K_2CrO_4\)

Use this number as a fraction.

\(\frac{6.022*10^{23} \ atoms \ K_2CrO_4}{1 \ mol \ K_2CrO_4}\)

Multiply by the given number of moles (8.00).

\(8.00 \ mol \ K_2CrO_4 *\frac{6.022*10^{23} \ atoms \ K_2CrO_4}{1 \ mol \ K_2CrO_4}\)

The moles of potassium chromate will cancel.

\(8.00 *\frac{6.022*10^{23} \ atoms \ K_2CrO_4}{1}\)

The denominator of 1 can be ignored.

\(8.00 *(6.022 *10^{23} \ atoms \ K_2CrO_4)\)

Multiply.

\(4.8176*10^{24} \ atoms \ K_2CrO_4\)

The original measurement of moles (8.00) has 3 significant figures, so we must round our answer to 3 sig figs.

For the number we calculated, that is the hundredth place. The 7 in the thousandth place tells us to round the 1 up to a 2.

\(4.82 *10^{24} \ atoms \ K_2CrO_4\)

There are about 4.82* 10²⁴ atoms of potassium chromate in 8.00 moles.

Answer:

All are reflective except for stone

i guess it is stone

Explanation:

Hope it helps!!!

\(\large\underline{\underline{\maltese{\orange{\pmb{\sf{\: Reasoning :-}}}}}}\)

The mass of 0.105 mole of sucrose is 36 g.

Number of moles of sucrose (C12H22O11) = 0.105 moles

Mass of 1 mole of sucrose (C12H22O11) = 342.3 g

According to the Avogadro’s Law, “Equal volumes of all gases, at the same temperature and pressure, have the same number of molecules.”This law helps to establish the relationship between the number of moles and the mass of the substance.

The mass of one mole of any substance is called its molar mass.The molar mass of sucrose (C12H22O11) is calculated by summing up the masses of all the atoms present in its molecular formula.

n = Number of moles of sucrose (C12H22O11)

M = Mass of 1 mole of sucrose (C12H22O11)

The formula for the calculation of mass of sucrose is, m = n × M

Putting the values of n and M, we get, m = 0.105 mol × 342.3 g/mol

M = 36.0 g

Therefore, the mass in grams, of 0.105 mole of sucrose (C12H22O11) is 36.0 g.

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Actually Welcome to the Concept of the Acceleration.

a = V2-V1/t

so the correct answer is, a = ∆v/t

option C.) is correct, a = ∆v/t

Answer:

m = y2-y1 / x2-x1

Explanation:

Answer:

sunlight, light energy from the sun

Explanation:

energy is transferred from the sun to plants then animal's eat plants

Acetic acid and sodium hydroxide used to make a buffer solution.

What is buffer solution?

buffer solution is a waterproof solvent based solution in  which consists of a mixture of  containing a weak acid and  the conjugate base of the weak acid, or a weak base of the solution and the conjugate acid of the weak base. They resist to a  change in pH upon to the  dilution or upon the addition of small amounts of a  acid/alkali to them. Buffer solution resist of a  change in pH when smallest amounts of a stronger acid or a stronger base are added.

Sol-Acetic acid is a weaker acid and  its conjugate base is the acetate anion. That's why the addition of the strong base, hydroxide, which neutralized half of a  acetic acid created a buffer and  solution because we are having  significant amounts of both acetic acid and its conjugate base, the acetate anion, in the solution.

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Answer:

28.69 grams

Explanation:

To find the mass, we first need to find the moles. Once we have the moles, it is easy to use the molar mass of H2SO4 to find its mass.

To find the moles, remember that molarity (M) is equal to the moles divided by the volume (L). The volume HAS TO be converted to liters!

M = moles / V

5.85 M = moles / 0.05 L

moles = 0.2925

Now we know that we have 0.2925 moles of sulfuric acid. The molar mass of sulfuric acid is 98.08 g/mol.

0.2925 moles * (98.08 g / mol) = 28.69 grams

Make sense? If you have any questions, don't hesitate to ask!

Answer:

Giant cell, also called Langhans giant cell, large cell characterized by an arc of nuclei toward the outer membrane. The cell is formed by the fusion of epithelioid cells, which are derived from immune cells called macrophages. Once fused, these cells share the same cytoplasm, and their nuclei become arranged in an arc near the outer edge of the cell. Langhans giant cells typically form at the centre of granulomas (aggregates of macrophages) and are found in the tubercle, or primary focus of infection, in tuberculosis, in lesions of syphilis, leprosy, and sarcoidosis, and in fungal infections.Large cells that form by fusion in reaction to the presence in the body of foreign substances differ from Langhans giant cells in that their many nuclei are scattered throughout the cell. In giant-cell tumours of bone and tendon the cells have many nuclei crowded together. The megakaryocytes, the normal bone-marrow cells thought to be the source of the blood platelets, are also called giant cells.

Explanation:

I'M WORKING ON THIS SUBJECT TOO!!!!!

The possible values of the quantum numbers are:

Orbital shape quantum number l: 0, 1, 2, 3, 4, or 5.

Magnetic quantum number m: -l to +l.

Spin quantum number, s: +1/2 or -1/2.

For the principal quantum number n = 6, the possible values of the azimuthal (orbital shape) quantum number l are 0, 1, 2, 3, 4, and 5.

The magnetic quantum number m can have values ranging from -l to +l, inclusive.

The spin quantum number, s can be either +1/2 or -1/2.

So, the valence electrons in an atom with principal quantum number n = 6 can have the following quantum numbers:

Azimuthal quantum number, l can be 0, 1, 2, 3, 4, or 5.

Magnetic quantum number, m can range from -l to +l, inclusive.

Spin quantum number, s can be either +1/2 or -1/2.

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The diagram is in the given picture. Ketones are more reactive towards the base than aldehydes.

On using a base,  the bottom abstracts a proton from alpha hydrogen to form a carbanion. Carbanion formed is stabilized because the negative charge formed participates in resonance with the carbonyl group.

What is the carbonyl group?

A  group consists of a double bond linking a carbonyl carbon atom and a carbonyl oxygen atom. The carbonyl oxygen atom shares two of its six valence electrons with the carbonyl atom. Its remaining four valence electrons remain as two sets of electron lone pairs.

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In a saturated aqueous solution of CdF2, the equilibrium is represented by the equation CdF2(s) ⇌ Cd2+(aq) + 2F-(aq). The question asks about the concentration of Cd2+ in the solution at equilibrium, represented as [Cd2+]eq. To determine this, we need to consider the solubility product constant, Ksp, of CdF2.

The Ksp expression for CdF2 is given by:

We can set up an equilibrium expression for CdF2:

So, we can substitute [F-]eq = 2[Cd2+]eq into the equilibrium expression: [Cd2+]eq = (2[Cd2+]eq)^2. Simplifying the equation, we get:

Factoring out [Cd2+]eq, we get [Cd2+]eq([Cd2+]eq - 4) = 0. This equation has two possible solutions:

An aqueous solution is a solution in which the solvent is water. These solutions are often labeled in chemical equations. For example, a solution of table salt or sodium chloride can be written NaCl. The word "aqueous" here means related to, similar to, or soluble in water. Aqueous humor functions to provide nutrition (in the form of glucose and amino acids) to the eye tissues in the anterior segment, such as the lens, cornea and TM. In addition, waste products of metabolism (such as pyruvic acid and lactic acid) are also removed from these tissues. Aqueous humor is a clear fluid in the eyeball that is continuously produced by the ciliary body. Reporting from All About Vision, aqueous humor is located in the anterior chamber (between the cornea and the iris) as well as in the posterior chamber (between the iris and the front of the lens).

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0.67 moles of glucose are dissolved in 250 mL of a 2.67 M solution.

Thus, The name "glucose" is derived from the Greek word for "sweet." Your body uses this particular sort of sugar, which it obtains from the food you consume, as fuel.

It is referred to as blood glucose or blood sugar when it passes through your bloodstream to reach your cells. The hormone insulin transports glucose from the blood into the cells for use as fuel and storage. Blood glucose levels are higher in diabetics than in healthy people.

Either their cells don't react to insulin as insulin should or they don't have enough insulin to get it through. Long-term high blood glucose levels can harm your kidneys, eyes, and other organs.

Thus, 0.67 moles of glucose are dissolved in 250 mL of a 2.67 M solution.

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Answer:  410 nm

Explanation: Energy of a photon is E = hf = hc/λ. The smaller wavelength λ, the greater energy

500 mL D5W is infusing at the rate of 25 macrogtt / min. The drop factor is 10 gtt /m L and it will take 20 minutes for the IV to infuse.

First, we need to calculate the flow rate in mL/min using the given information.

25 macrogtt/min × 10 gtt/mL = 250 gtt/mL

The flow rate in mL/min is the same as the number of drops per minute divided by the drop factor, which is:

250 gtt/mL ÷ 10 gtt/mL = 25 mL/min

Now we can use the formula:

time = volume ÷ rate

where volume is the total volume to be infused and rate is the flow rate.

Plugging in the given values, we get:

time = 500 mL ÷ 25 mL/min

time = 20 minutes

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Answer: Van't Hoff factor, i is less than expected from the formula of the compound and this decreases the effective concentration of particles.

Explanation:

Strong electrolytes are defined as the solutions which completely dissociate into their ions.

But, most of the strong electrolytes do not dissociate completely (act ideally) but remain partially undissociated into the ions. Thus, giving a lesser number of ions in the solution than expected.

This means that the Van't Hoff factor, i which denotes the number of ions is less than expected.

As fewer ions are released in the solution, the concentration of the solution is expected to decrease.

Hence, van't Hoff factor, i is less than expected from the formula of the compound and this decreases the effective concentration of particles.

The flaw in Regina’s plan is that the time frame is unrealistic (option B).

Goal setting involves the development of an action plan designed in order to motivate and guide a person or group toward a goal, which is a result that one is attempting to achieve.

Effective goal setting lets you measure progress, overcome procrastination and visualize your dreams. However, setting goals is said to be effective when it is done in an adequate time frame.

According to this question, Regina identifies her goal and hastily writes it down as follows: I will make an A on my English literature term paper that is due next week.

This goal, although is great, is unlikely to be met because of the time frame. One cannot get an excellent result in something that lacks adequate preparation, which includes adequate time.

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Answer: Groups

Explanation:

I took the quiz

Answer:

Apply pressure

Explanation:

I took the Test and got it right.

Answer:

A

Explanation: