Pb2+ (aq) + Mg (s) --> Pb (s) + Mg2+ (aq) If [Pb2+] = 0.10 M and [Mg2+] = 2.0 M, calculate the cell potential for this system. Please show your work for credit

Answer:

(b) The change favors the reactants which has more gas molecules. ... Describe the effect of increasing the concentration of nitrogen gas or hydrogen gas inside the ... (c) The change causes an decrease in ammonia favoring the reactants. ... (c) Catalysts do not affect the equilibrium only the rate of reaction

The flow of chilled water through the cooling coil is regulated by a control valve.

In HVAC systems, the flow of chilled water through the cooling coil is regulated by a device called a control valve. The control valve is responsible for adjusting the flow rate of chilled water based on the cooling demand of the system. It ensures that the right amount of chilled water is supplied to the cooling coil to maintain the desired temperature in the conditioned space.

The control valve is typically controlled by a building automation system or a thermostat. These devices monitor the temperature in the conditioned space and send signals to the control valve to open or close. When the temperature rises above the set point, the control valve opens to allow more chilled water to flow through the cooling coil, cooling the air. Conversely, when the temperature falls below the set point, the control valve closes to reduce the flow of chilled water.

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The flow of chilled water through the cooling coil is regulated by a control valve. This valve adjusts the flow rate based on the cooling needs of the system.

A thermostat or temperature sensor provides signals to the control valve, which opens or closes accordingly.

When the temperature exceeds the desired setpoint, the control valve opens, allowing more chilled water to pass through the cooling coil.

This increases cooling capacity and lowers the air or space temperature.

Conversely, the control valve closes when the temperature reaches or falls below the set point, reducing chilled water flow.

The control valve ensures precise temperature control and efficient cooling operation in the system.

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Answer:

3.39 mol

Explanation:

n = m/M, where n is moles, m is mass and M is molar mass.

n = 149/44.01

n = 3.38559418314 mol

n = 3.39 mol

Hope that helps

The number of protons in an isotope atom does not change but the number of neutrons does. The iron atom has about twenty-eight isotopes. Such as 45Fe, 46Fe, 47Fe, 48Fe, 49Fe, 50Fe, 51Fe, 52Fe, 53Fe, 54Fe, 55Fe, 56Fe, 57Fe, 58Fe, 59Fe, 60Fe, 61Fe, 62Fe, 63Fe, 64Fe, 65Fe, 66Fe, 67Fe, 68Fe, 69Fe, 70Fe, 71Fe and 72Fe.

Among the isotopes, 54Fe (Observationally Stable), 56Fe, 57Fe, and 58Fe are stable and formed naturally. The remaining isotopes of iron are highly unstable and their half-lives are very short.

Isotope Mass number (A) Atomic number (Z) Neutron number = A – Z

45Fe 45.01458 26 19

46Fe 46.00081 26 20

47Fe 46.99289 26 21

48Fe 47.98050 26 22

49Fe 48.97361  26 23

50Fe 49.96299 26 24

51Fe 50.956820 26 25

52Fe 51.948114 26 26

53Fe 52.9453079 26 27

54Fe 53.9396090 26 28

55Fe 54.9382934 26 29

56Fe 55.9349363 26 30

57Fe 56.9353928 26 31

58Fe 57.9332744 26 32

59Fe 58.9348755 26 33

60Fe 59.934072 26 34

61Fe 60.936745 26 35

62Fe 61.936767 26 36

63Fe 62.94037 26 37

64Fe 63.9412 26 38

65Fe 64.94538 26 39

66Fe 65.94678 26 40

67Fe 66.95095 26 41

68Fe 67.95370 26 42

69Fe 68.95878 26 43

70Fe 69.96146 26 44

71Fe 70.96672 26 45

71Fe 71.96962 26 46

Answer:

Protons: 26

Neutrons: 30

Electrons: 24

Explanation:

Answer: (2S,3S)-2-Bromo-3-phenylbutane will undergo E2 reaction and form trans product of elimination due to its thermodynamic stability

Explanation:

Answer:

378mL

Explanation:

The following data were obtained from the question:

Pressure (P) = 99.19 kPa

Temperature (T) = 28°C

Number of mole (n) = 0.015 mole

Volume (V) =...?

Next, we shall convert the pressure and temperature to appropriate units. This is illustrated below:

For Pressure:

101.325 KPa = 1 atm

Therefore, 99.19 kPa = 99.19/101.325 = 0.98 atm

For Temperature:

T(K) = T(°C) + 273

T(°C) = 28°C

T(K) = 28°C + 273 = 301K.

Next we shall determine the volume of N2. The volume of N2 can be obtained by using the ideal gas equation as shown below:

PV = nRT

Pressure (P) = 0.98 atm

Temperature (T) = 301K

Number of mole (n) = 0.015 mole

Gas constant (R) = 0.0821atm.L/Kmol.

Volume (V) =...?

0.98 x V = 0.015 x 0.0821 x 301

Divide both side by 0.98

V = (0.015 x 0.0821 x 301) /0.98

V = 0.378 L

Finally, we shall convert 0.378 L to millilitres (mL). This is illustrated below:

1L = 1000mL

Therefore, 0.378L = 0.378 x 1000 = 378mL

Therefore, the volume of N2 collected is 378mL

Answer:

here down below is the anwser

Explanation:

Iron (III) oxide can be produced by the reaction shown in this equation:

2Fe +3C2 (arrow) 2FeCl3

Calculate the maximum mass of Iron (III) chloride that can be produced from 11.20 grams of iron?

Relative atomic masses: Cl= 35.5 , Fe =56

The time taken to decay from 308 g to 4.8125 g is approximately 114 days, or 3.8 months.

The radioactive decay formula is given by,N(t) = N0 * e^(-λ*t),

where N(t) is the amount of remaining radioactive sample at time t, N0 is the initial amount of the radioactive sample, λ is the decay constant, and e is the mathematical constant approximately equal to 2.71828.

Given,Initial mass, N0 = 308 g

Mass after decay, N(t) = 4.8125 g

We need to find the time taken to reach this decay.

First, we need to find the decay constant from the given half-life,The half-life of the given radioactive sample is 14.3 days.

We know that,Half-life, t(1/2) = 14.3 days.

Decay constant, λ = ln(2) / t(1/2)λ

= 0.0484 / day

Substitute the given values in the radioactive decay formula,N(t) = N0 * e^(-λ*t)

We get,4.8125 = 308 * e^(-0.0484 * t)

Divide both sides by 308,0.015625 = e^(-0.0484 * t)

Taking natural logarithm on both sides, ln(0.015625) = ln(e^(-0.0484 * t))

ln(0.015625) = -0.0484 * t

ln(0.015625) / -0.0484 = t

Hence, the time taken to decay from 308 g to 4.8125 g is approximately 114 days, or 3.8 months.

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The gas is most likely to be Xenon. So the correct option is (a)

The rate of diffusion, is the change in the number of diffusing molecules inside the cell over time i.e. \(d_{n}\) / \(d_{t}\). As the net movement of diffusing molecules depends on the concentration gradient then the rate of diffusion is directly proportional to the concentration gradient (\(d_{C}\)/\(d_{t}\)) across the membrane.

Since,  \(\frac{1}{time}\) \(\alpha\) \(\frac{pressure}{\sqrt{molar weight} }\)

In the given question time required for 0.010 moles of SO₃ is 22 s

Time required for 1 mole of SO₃ is  \(\frac{22}{0.01}\) × 1 = 2200 s

Now,  \(\frac{1}{2200}\) \(\alpha\) \(\frac{1}{\sqrt{80} }\)

For unknown gas

\(\frac{1}{2800}\) \(\alpha\) \(\frac{1}{\sqrt{m} }\)

Now combining both the equation;

Since,

\(\frac{1}{2200}\) × 2800 = \(\frac{1}{\sqrt{80} }\) ×\(\sqrt{m}\)

m = 129.02 g/mole

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Potassium-41 has 22 neutrons, which is the same number of neutrons as argon-40. Thus, the statement is true.

Both potassium-39 and argon-40 have 20 neutrons. Isotopes are elements that have the same number of protons but different numbers of neutrons. Since the isotope of potassium in the question has the same number of neutrons as argon-40, it means that they have the same atomic mass number. This phenomenon is due to the fact that argon-40 is formed from the radioactive decay of potassium-40, which has 21 neutrons. Therefore, the correct answer to the question is true.
The statement "An isotope of potassium has the same number of neutrons as argon-40" is True (a).

Potassium and argon are two different elements, but isotopes of these elements can have the same number of neutrons. To determine this, we need to look at the isotope of potassium that has the same number of neutrons as argon-40.

Argon-40 is an isotope of argon, which has an atomic number of 18. The atomic mass number of argon-40 is 40, so it has 22 neutrons (40 - 18 = 22).

Potassium has an atomic number of 19, meaning it has 19 protons. To find an isotope of potassium with the same number of neutrons as argon-40, we need to find a potassium isotope with an atomic mass number that results in 22 neutrons.

Potassium-41 is an isotope of potassium with an atomic mass number of 41. To find the number of neutrons in potassium-41, subtract the atomic number (protons) from the atomic mass number:

41 - 19 = 22

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Answer:

option C) Two liquids mixing to produce a precipitate.

this one is correct, because precipitate is only formed in a chemical reaction.

The compound:

Can be called as Tungsten (V) hydroxide.

Answer:

pH is an index of how many protons, or hydrogen ions (H+) are dissolved and free in a solution. The pH scale goes from 0 to 14. A fluid with a pH of 7 is neutral. Below 7, it is acidic; above 7, it is alkaline.

The more below or above 7 a solution is, the more acidic or alkaline it is. The scale is not linear—a drop from pH 8.2 to 8.1 indicates a 30 percent increase in acidity, or concentration of hydrogen ions; a drop from 8.1 to 7.9 indicates a 150 percent increase in acidity. Bottom line: Small-sounding changes in ocean pH are actually quite large and definitely in the direction of becoming less alkaline, which is the same as becoming more acidic.

If you think about it, we use descriptive words like this all the time. A person who stands 5’5” tall and weighs 300 pounds isn’t thin. If he loses 100 pounds, he still won’t be thin, but he will be thinner than he was before he went on the diet. (And we are more likely to comment that he’s looking trimmer than to say he’s not as fat as he used to be.)

The method cbo.additem(s) adds an item s into a combobox cbo. Option C

The method that adds an item 's' into a ComboBox 'cbo' depends on the programming language or framework being used. However, based on common naming conventions and methods used in various programming languages, the most likely correct option is (c) cbo.addItem(s).

In many programming languages and frameworks, the method to add an item to a ComboBox is typically named 'addItem' or 'add' followed by the item's name or value. Let's analyze the given options to determine the most appropriate choice:

(a) cbo.addChoice(s):

This option uses the term 'addChoice,' which is not commonly used for adding items to ComboBoxes. It is less likely to be the correct method name.

(b) cbo.addObject(s):

Similar to option (a), 'addObject' is not a common method name for adding items to ComboBoxes. It is often used for adding objects to other data structures but not ComboBoxes specifically.

(c) cbo.addItem(s):

This option is the most commonly used method name for adding items to a ComboBox. It follows standard naming conventions and accurately describes the action of adding an item to the ComboBox.

(d) cbo.add(s):

This option is less specific and might be used in some cases, but 'addItem' is a more appropriate and descriptive method name for ComboBoxes.

(e) cbo.getItems():

This option retrieves the items from the ComboBox rather than adding an item. It is used to get the existing items in the ComboBox and not to add new ones.

In summary, based on standard naming conventions and commonly used methods in programming languages, the most appropriate method for adding an item 's' to a ComboBox 'cbo' is (c) cbo.addItem(s).

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The rate of speed of gas is inversely proportional to its square root of molecular mass according to  Graham's law. From this concept the average speed of butane gas at the same temperature is 165.37 m/s.

Graham's law states that the rate of diffusion of a gas at a temperature is inversely proportional to its molecular weight. Let A and B are two different gases taken at same temperature and Ma and Mb b their molecular mass.

Then,

Rate a/rate b = √(Mb/Ma)

Here, the gas a be neon , then

rate a = 400 m/s

and Ma = 20 g/mol

gas b is butane with Mb = 58 g/mol

then rate b can be calculated as follows:

400 m/s / Rb = √(58 g/mol / 20 g/mol)

400 m/s/ Rb = 2.418

then Rb = 165.37 m/s.

Therefore, the rate of speed of butane at the given temperature is 165.3 m/s.

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Answer: B

Explanation: Because it has 4  things to up down right and left

To determine the theoretical yield of 1-hexanol in grams, we need to calculate the moles of 1-hexene, borane, and hydrogen peroxide, and then determine the limiting reagent.

Moles of 1-hexene = Volume (ml) x Density (g/ml) / Molar mass

Moles of 1-hexene = 0.90 ml x 0.673 g/ml / 84.16 g/mol (molar mass of 1-hexene)

Moles of 1-hexene = 0.0071779 mol

Moles of borane = Volume (ml) x Molarity (mol/L)

Moles of borane = 1.65 ml x 1.00 mol/L

Moles of borane = 0.00165 mol

Moles of hydrogen peroxide = Volume (ml) x Concentration (% m/v) / (100 x Molar mass)

Moles of hydrogen peroxide = 1.28 ml x 30.0 g/100 ml / (100 x 34.0147 g/mol)

Moles of hydrogen peroxide = 0.01182 mol

Since the moles of borane (0.00165 mol) are the lowest among the three compounds, it is the limiting reagent.

Theoretical yield = Moles of limiting reagent x Molar mass of 1-hexanol

Theoretical yield = 0.00165 mol x 102.18 g/mol (molar mass of 1-hexanol)

Therefore, the theoretical yield of 1-hexanol in this reaction is approximately 0.171 grams.

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The mechanisms include:

Step 1: The chlorine atom in Cl2 is electrophilic, meaning that it has a partial positive charge. The carbonyl carbon of acetophenone is nucleophilic, meaning that it has a partial negative charge. The chlorine atom and the carbonyl carbon form a new covalent bond, and a chloride ion is formed.

Step 2: The chlorinated intermediate is unstable because it has a positive charge on a carbon atom. The carbon atom loses a proton, forming a carbocation.

Step 3: A chloride ion attacks the carbocation, forming chloroacetophenone. The chloride ion is a good nucleophile because it has a lone pair of electrons. The lone pair of electrons on the chloride ion attacks the carbocation, forming a new covalent bond.

Step 4: The water molecule abstracts a proton from chloroacetophenone, forming the final product, 2-chloro-1-phenylethanol. The water molecule is a good base because it has a lone pair of electrons. The lone pair of electrons on the water molecule attacks the proton on chloroacetophenone, forming a new covalent bond and a hydroxide ion. The hydroxide ion then leaves, taking the proton with it.

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Answer:

the same number of molecules.

Explanation:

According to Avogadro's hypothesis, two samples of gas of equal volume, at the same temperature and pressure, contain the same number of molecules.

Answer:

78.894g of NaCl

Explanation:

This requires some dimensional analysis:

Using the molar mass of NaCl we get the answer we are looking for.

1.35 Moles of NaOH * \(\frac{58.44g NaCl}{ 1 mole NaCl}\) = 78.894 g of NaCl

According to the research, the correct option is d. Fernando is currently going through Detoxification process in which his body is cleared of drugs.

This is the treatment aimed at restoring the body's physiological homeostasis after it has been disturbed by the consumption of psychotropic substances as drugs.

In this sense, this process is carried out under the supervision of specialists in the treatment of addictive behaviors.

Therefore, we can conclude that Detoxification is a process of eliminating drugs or substances harmful to health to achieve physiological stability in the body.

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yes the taste of acid is sour

Explanation:

the acid increase the hydrogen concentration, which provides more ions for the tongue. Because the tongue gains ions, it registers the flavor as sour.

The mass percent composition of 2.45 g of calcium in 3.43 g of calcium oxide is 28.54%.

To determine the mass percent composition of calcium in calcium oxide, we can calculate the mass of calcium in the calcium oxide sample and express it as a percentage of the total mass of the sample.

First, let's find the mass of calcium that reacted:

mass of calcium = 3.43 g - mass of oxygen = 3.43 g - (2.45 g - mass of calcium) = 0.98 g

Next, let's find the percent of calcium in the calcium oxide:

mass percent of calcium = (mass of calcium / mass of calcium oxide) x 100%

mass percent of calcium = (0.98 g / 3.43 g) x 100%

mass percent of calcium = 28.54%

So the mass percent composition of calcium in calcium oxide is 28.54%.

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The solution of 100.0 mL of 0.250 M BaCl2 contains the largest number of ions among the given options.

To determine which of the given solutions of strong electrolytes contains the largest number of ions, we need to consider the dissociation of each compound and calculate the total number of ions produced.

1. NaOH:

NaOH is a strong electrolyte that dissociates completely in water into sodium ions (Na⁺) and hydroxide ions (OH⁻).

NaOH → Na⁺ + OH⁻

Since the concentration of NaOH is 0.175 M, we have 0.175 moles of NaOH in 1 liter (1000 mL) of solution. In 50.0 mL of solution, we have:

0.175 M × (50.0 mL / 1000 mL) = 0.00875 moles of NaOH

Therefore, the number of ions produced from NaOH is:

2 ions (Na⁺ and OH⁻) × 0.00875 moles = 0.0175 moles of ions

2. BaCl_2:

BaCl2 is also a strong electrolyte that dissociates completely in water into barium ions (Ba²⁺) and chloride ions (Cl⁻).

BaC_l2 → Ba²⁺ + 2Cl⁻

The concentration of BaCl_2 is 0.250 M, and we have 0.250 moles of BaCl_2 in 1 liter (1000 mL) of solution. In 100.0 mL of solution, we have:

0.250 M × (100.0 mL / 1000 mL) = 0.025 moles of BaCl_2

Therefore, the number of ions produced from BaCl_2 is:

3 ions (Ba²⁺ and 2Cl⁻) × 0.025 moles = 0.075 moles of ions

3. Na_3PO_4:

Na_3PO_4 is also a strong electrolyte that dissociates completely in water into sodium ions (Na⁺) and phosphate ions (PO₄³⁻).

Na_3PO_4 → 3Na⁺ + PO₄³⁻

The concentration of Na_3PO_4 is 0.050 M, and we have 0.050 moles of Na_3PO_4 in 1 liter (1000 mL) of solution. In 250.0 mL of solution, we have:

0.050 M × (250.0 mL / 1000 mL) = 0.0125 moles of Na_3PO_4

Therefore, the number of ions produced from Na_3PO_4 is:

4 ions (3Na⁺ and PO₄³⁻) × 0.0125 moles = 0.050 moles of ions

Comparing the number of moles of ions produced in each solution, we find that the solution of 100.0 mL of 0.250 M BaCl_2 contains the largest number of ions:

0.075 moles of ions.

Therefore, the solution of 100.0 mL of 0.250 M BaCl2 contains the largest number of ions among the given options.

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Answer: 1.21 moles to 3 sig figs

Explanation:

All gases occupy 22.4 liters per mole of gas at STP.

(22.4 L/mole) at STP is an imoportant conversion factor.  It helps to remember it and is good cocktail party conversation, for the right crowd.

(27.2L CO2 gas)/(22.4 L/mole) = 1.21 moles to 3 sig figs

Amides are not strongly acidic or basic, but rather amphoteric, meaning they can act as both an acid and a base. (None of the above)

This is due to the presence of a lone pair of electrons on the nitrogen atom and the presence of a carbonyl group. In acidic conditions, the amide can donate a proton from the nitrogen, making it act as a base. In basic conditions, the carbonyl group can accept a proton, making the amide act as an acid. However, the amphoteric nature of amides is relatively weak, and they are typically considered to be neutral compounds.

However, they are not considered strongly basic, acidic, or amphoteric. Therefore, the correct answer to your question is "none of the above." Amides are less basic than amines due to the resonance stabilization provided by the carbonyl group, which reduces the electron density on the nitrogen atom.

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Answer:

Veins

Explanation:

Veins, which usually look blue, return blood to the heart.

Answer:

so i think mass of water is 235 ml

Answer:

Which of the elements below will form an anion?

CI (Chlorine)

Explanation: Chlorine generally behaves as an anion having an oxidation state -1