Describe a circumstance in food analysis where you would use standard addition for quantitation. Describe a circumstance in food analysis where you would use internal standard for quantitation. In lab-7, was pure caffeine used as an external standard, an internal standard, or standard addition?

If more \(H_{2}\) and \(N_{2}\) are added to the reaction 3\(H_{2}\) + N2 → 2\(NH_{3}\) after it reaches equilibrium, two events will occur Shift in Equilibrium and Increased Yield of \(NH_{3}\)

1. Shift in Equilibrium: According to Le Chatelier's principle, when additional reactants are added, the equilibrium will shift in the forward direction to consume the added reactants and establish a new equilibrium. In this case, more \(NH_{3}\) will be produced to counteract the increase in \(H_{2}\) and \(N_{2}\).

2. Increased Yield of \(NH_{3}\): The shift in equilibrium towards the forward reaction will result in an increased yield of \(NH_{3}\). As more \(H_{2}\) and \(N_{2}\) are added, the reaction will favor the production of \(NH_{3}\) to maintain equilibrium. This will lead to an increase in the concentration of \(NH_{3}\) compared to the initial equilibrium state.

It is important to note that the equilibrium position will ultimately depend on factors such as the concentrations of \(H_{2}\), \(N_{2}\), and \(NH_{3}\), as well as the temperature and pressure of the system. By adding more reactants, the equilibrium will adjust to achieve a new balance, favoring the formation of more \(NH_{3}\).

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To quickly find the number of resonating structures of O3 and SO4-2, you can use the formula:

Number of resonating structures = 2^(number of equivalent resonance structures)

For O3, each oxygen atom is equivalent and there are two possible equivalent resonance structures:

O = O - O and O - O = O

Therefore, the number of resonating structures for O3 is:

2^(2) = 4

For SO4-2, there are two equivalent resonance structures for the sulfur-oxygen bonds and four equivalent resonance structures for the sulfate ion as a whole:

S = O and S - O(-)

O(-) - S - O and O = S = O(-)

Therefore, the number of resonating structures for SO4-2 is:

2^(2) x 2^(4) = 16

So the number of resonating structures for O3 is 4, and the number of resonating structures for SO4-2 is 16.

Explanation:

i have done

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Answer:

restore adequate breathing

Explanation:

If you suspect smoke breathing, inquire healing consideration and stimulate crisis aids. If the martyr is in a held room and you suspect poisonous vapor, open the doors roomy and allow the smoke escape before permanently introducing.'

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Answer:

hydrogen nucleus formed, isotope of hydrogen, trítium formed, helium nucleus formed

Explanation:

Nucleosynthesis is the process which took place within few minutes of formation of universe . In this process initial lighter elements were formed from hydrogen atoms . The correct chronology is as follows .

1 ) Hydrogen nucleus

2 ) Deuterium

3 ) Tritium

4) Helium nucleus .

The correct order of events during the process of nucleosynthesis is hydrogen nucleus formed, isotope of hydrogen, tritium formed, helium nucleus formed.

Nucleosynthesis is a process that occurred within a few minutes of the universe's birth. Hydrogen atoms were used to create the first lighter elements in this process.

The following is the correct sequence of events.

Thus, the correct option is A.

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According to the VSEPR (Valence Shell Electron Pair Repulsion) theory, the most likely shape or geometry of a molecule is determined by the arrangement of electron pairs around the central atom. ]

To identify the shape, we need to draw the electron dot diagram for each molecule.

1. CH2S: The central atom is carbon (C). Carbon has 4 valence electrons, hydrogen (H) has 1 valence electron, and sulfur (S) has 6 valence electrons. To satisfy the octet rule, carbon forms 4 single bonds with hydrogen and sulfur. The electron dot diagram shows that carbon is surrounded by 4 electron pairs, resulting in a tetrahedral geometry.

2. CHF2: The central atom is carbon (C), and it has 4 valence electrons. Carbon forms a single bond with hydrogen (H) and two single bonds with fluorine (F). The electron dot diagram shows that carbon is surrounded by 3 electron pairs, resulting in a trigonal planar geometry.

3. As3: The central atom is arsenic (As), and it has 5 valence electrons. Arsenic forms 3 single bonds with three other atoms. The electron dot diagram shows that arsenic is surrounded by 4 electron pairs, resulting in a tetrahedral geometry.

4. TeCl2: The central atom is tellurium (Te), and it has 6 valence electrons. Tellurium forms 2 single bonds with chlorine (Cl). The electron dot diagram shows that tellurium is surrounded by 3 electron pairs, resulting in a V-shaped or bent geometry.

Therefore, the most likely shape (geometry) for each of the molecules is:
1. CH2S - tetrahedral
2. CHF2 - trigonal planar
3. As3 - tetrahedral
4. TeCl2 - V-shaped (bent)

Remember, the VSEPR theory helps us predict the molecular geometry based on the arrangement of electron pairs around the central atom.

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Answer: Copper (I) Carbide

Explanation:

Copper is a polyatomic ion, meaning it has multiple charges. Carbon has an outer shell consisting of 4 valence electrons so it can either add or lose 4 electrons so it’s charge can be -4 or +4. As said Copper has multiple charges but they are positive, so in this case Cu4 would be 4 +1 charges compared to C which would be -4. Therefore this is a 4:1 ratio, meaning Cu4C is Copper (I) Carbide

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Answer:

it would be answer (B)

Explanation:

Answer:

True

Explanation:

In an electrolytic cell, nitrate ions (NO3^2-) being anions, do migrate to the anode. However, you would expect water (H2O) to be oxidized at the anode instead of nitrate ions because of the oxidation state of nitrogen in the nitrate ion.

In an electrolytic cell, the anode is the electrode where oxidation occurs. When nitrate ions (NO3^2-) migrate to the anode, they cannot be oxidized because they are already in their highest possible oxidation state (-1 for each oxygen atom and -3 for nitrogen atom).

This means that the nitrate ions are already fully oxidized and cannot undergo further oxidation at the anode. Instead, water (H2O) molecules are more likely to be oxidized at the anode.

This is because water molecules can be oxidized to form oxygen gas (O2) and hydrogen ions (H+), which are both able to participate in further reactions within the cell.

Additionally, water molecules have a lower oxidation state than nitrate ions, which makes them more susceptible to being oxidized. Therefore, it is expected that water rather than nitrate ions will be oxidized at the anode in an electrolytic cell.

Nitrogen in the nitrate ion has an oxidation state of +5, which is already its maximum possible oxidation state. Since it cannot be further oxidized, water molecules present in the solution will be preferentially oxidized at the anode, producing oxygen gas and releasing H+ ions.

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The end of a very long 5-mm-diameter rod is held at 124°C. The surface of the rod is exposed to ambient air at 30°C, with a convective heat transfer coefficient of 100 W/m2K. Determine the temperature at a radial distance of 2.5 mm from the rod's center. The thermal conductivity of the rod is 15 W/mK.b) What is the temperature gradient in the rod at this location?c).

What is the heat flux at this location?The temperature at a radial distance of 2.5 mm from the rod's center is 79.58°C.The solution for this problem can be found by following the steps below:Solution:a) The temperature of the rod, T, can be calculated using the formula for one-dimensional conduction:q/A = -k (d T/d r)whereq is the heat flux,A is the cross-sectional area of the rod,r is the radial distance from the center of the rod,k is the thermal conductivity of the rod,and T is the temperature of the rod.

Taking the boundary condition into account,T(r=0) = 124°CandT(r=2.5 mm) = 30°C, the solution to the differential equation is:T = T0 + (T1 - T0) (r/R)2whereT0 = 30°CT1 = 124°CR = 2.5 mm/2 = 1.25 mmso,T = 30 + (124 - 30) (r/1.25)2 = 30 + 78 (r/1.25)2at r = 2.5 mm,T = 79.58°Cb) The temperature gradient, d T/d r, is given by the derivative of the above equation:d T/d r = 124 (r/1.25)2 / 1.25where d T/d r = 98.72°C/mat r = 2.5 mmc) The heat flux, q/A, is given by the Fourier's law of heat conduction:q/A = -k (d T/d r)whereq/A = -15 (98.72/1000) = -1.48 W/m2at r = 2.5 mmTherefore, the temperature at a radial distance of 2.5 mm from the rod's center is 79.58°C, the temperature gradient in the rod at this location is 98.72°C/m, and the heat flux at this location is -1.48 W/m2.

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Answer:

To separate sand and table salt you would add water. Table salt dissolves in water leaving salt water and sand. The sand then will go through the process of filtration leaving salt water and sand separated.

Explanation:

Explanation:

(a):their malleability:

>iron making. iron worker heat the meat and hammer it to give them the desired shape.

> in the jewelry making process, like the gold or silver you wear are results due to the malleability of metal

(b):their ductility:

>for the making of high tension cable that connects different cities for transferring of electricity.

>for making wire gauze

(c):their ability to conduct electricity:

>for lighting up your house with light bulbs

>for using cooking stoves

>to make refrigerator work.

Answer:

a)gold and silver-used to make jewellery

b)gold and copper(we draw them in wires easily because they are not brittle)

c)copper and iron(this is because both of them are metal and metaps are best conductors of electricity)

Explanation:

uses of copper- to make utensils

to make wires for circuits

uses of silver-to make jewellery

to make mirrors

malleability is the property of a meta in which the metal can be changed into different shapes.

Ductility-can be drawn into thin wires.

Answer:

Physical change

Explanation:

Chemical change is defined as the process in which new substance with different properties is formed from old substance and the process is irreversible while physical change is a reversible process and changes only physical properties of a substance.

The given experiment is an example of physical change because it is just the physical act of dissolving. The metal disk is dissolving in sodium acetate and the process is exothermic and the process is reversible as well.

Hence, the correct answer is "physical change".

Answer:

i dk how ur school works, but you'll most likely have to take that science again to get the credits u need to graduate

Explanation:

What is mechanism ?

Around the turn of the twenty-first century, a framework for thinking about the philosophical presumptions underlying many branches of research, particularly in sciences like biology, neurology, and psychology, came to be known as the new mechanical philosophy (or, for brevity, the new mechanism). The unique characteristics of this framework are introduced and briefly summarized in this entry, and we also go over how it addresses a number of traditional problems in the philosophy of science, such as explanation, metaphysics, the relationships between scientific disciplines, and the process of scientific discovery. We demonstrate how the mechanistic framework has reoriented philosophical work for each of these problems, what the new mechanism has added to the conversation, and what needs to be done.

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Answer: Small intestine

Explanation:

Answer:

The periodic table will say it underneath the symbol.

Explanation:

I don't know how else to describe it but I hope this helps. :)

I believe it's (A). It will double.

Explanation:

Charles law states that the volume of an ideal gas is directly proportional to the absolute temperature at constant pressure. (Charles's law).

The pressure, volume, and temperature are the main factors of the ideal gas. At constant pressure when the temperature is doubled, then volume also gets doubled. Thus, option A is correct.

The ideal gas law has been known as the law that relates the pressure, volume, moles, and temperature of the gas particles. The relationship between the volume and the temperature of the gas was given by Charle's law.

According to Charle's law, the volume and the temperature have been known to have direct relation when the factor of pressure is said to be constant. If they exhibit the direct relation then doubling the temperature will double the volume of the gas.

Therefore, option A. the doubling of temperature doubles the volume is correct.

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0.21 L volume would be required to obtain 0. 70 moles of cl⁻ ions

What is Molarity??

Molarity (M) is amount of a substance in a certain volume of solution. It is defined as the moles of a solute per liters of a solution

M = n / V

where

n = no of moles

V = volume in litres

M = Molarity

FeCl3 --> Fe³⁺ + 3Cl⁻

From POAC

3 mole of Cl- = 1 mole of FeCl3

0.7 mole of Cl- = ( 1/3 ) × 0.7 = 0.7/3

Now, Molarity of FeCl3 = 1.1

M = n / V

V = n / M

= (0. 7 / 3) / 1.1 = 0.7/3.3 = 0.21 L

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Answer:

it is indeed a compound

Explanation:

Therefore, the freezing point of water will be lowered by 5.58 °C when 1.5 mol/kg of this salt is added to the water.

Freezing point is the temperature at which a liquid substance turns into a solid state at a given pressure. It is the temperature at which the solid and liquid states of the substance are in equilibrium. The freezing point is a physical property of a substance that depends on its chemical composition and pressure. The freezing point of pure water, for example, is 0 degrees Celsius (32 degrees Fahrenheit) at standard atmospheric pressure. However, the freezing point of a substance can be lowered or raised by adding solutes to the liquid or by increasing the pressure on the liquid.

Here,

Assuming the molality of the salt is 1.5 mol/kg, the freezing point depression can be calculated using the formula:

ΔTf = Kf x molality x i

where ΔTf is the freezing point depression, Kf is the freezing-point depression constant, molality is the molality of the solution, and i is the vent Hoff factor that takes into account the dissociation of the salt into ions. Since the salt breaks into two ions (Na+ and Cl-), i = 2.

Substituting the given values, we get:

ΔTf = -1.86 °C/m x 1.5 mol/kg x 2

ΔTf = -5.58 °C

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Answer:

it have been already balanced

2H2 + O2 = 2H2O.

Answer:

Explanation:

NaNO3

Just do a double displacement reaction, this is what you get (plus water)

The reaction shifts to the left, and the concentrations of SO2(g) and O2(g) increase.

Simply put, the system will seek to stay at equilibrium by shifting to compensate for change.

Complicatedly put, consider the fact that K (the equilibrium constant) is the concentration of products raised to their coefficients over the concentration of the reactants raised to their coefficients. If we write an expression for K, we get this:

\(K=\frac{[SO_3]^2}{[SO_2]^2[O_2]}\)

If we assume that, at equilibrium, all of the substances have a concentration of 1 molar, we get that

\(K=\frac{[1]^2}{[1]^2[1]}=1\)

If we increase SO3, K will increase. This means the system has now been removed from equilibrium. For example, if you add another mole of SO3, you get

\(Q=\frac{[2]^2}{[1]^2[1]}=4\)

(Q is just K, but not at equilibrium.)

Since the system wants to stay at equilibrium, it will work to restore equilibrium. The only way to do this is to increase the value of the reactants (the bottom numbers), meaning the reaction will shift to the left. Worded differently, when Q>K, the reaction will shift left.

Answer:

is not completely ionized in water

The ethanoic acid (acetic acid) is considered as a weak acid because it does not releases all of its hydrogen in water, rather it dissociates partially and establishes an equilibrium with its conjugate base.

The percentage of dark moths decreased over time, while the percentage of light moths increased. This is because the dark moths were more easily seen by predators on the light tree trunks. In the fifth year, the percentage of dark moths had returned to its original level.

Year | Dark moths | Light moths

-------|------------|------------

0      | 100%    | 0%

1       | 67%      | 33%

2      | 33%      | 67%

3      | 0%        | 100%

4      | 67%      | 33%

5      | 100%    | 0%

This experiment is a classic example of natural selection. Natural selection is the process by which organisms that are better adapted to their environment are more likely to survive and reproduce.

In this case, the light moths were better adapted to the environment because they were less visible to predators. As a result, they were more likely to survive and reproduce, and their population increased.

The peppered moth experiment is a powerful demonstration of how natural selection can work over time. It is also a reminder that the environment can change and that organisms must adapt to those changes in order to survive.

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