Write a balanced half-reaction for the reduction of gaseous nitrogen to aqueous hydrazine in acidic aqueous solution. Be sure to add physical state symbols where appropriate.

Explanation:

We have a 63.9 g sample of calcium hydroxide. First we have to convert those grams into moles. To do that we have to use the molar mass of calcium hydroxide.

Calcium hydroxide = Ca(OH)₂

molar mass of Ca = 40.08 g/mol

molar mass of O = 16.00 g/mol

molar mass of H = 1.01 g/mol

molar mass of Ca(OH)₂ = 1 * 40.08 g/mol + 2 * 16.00 g/mol + 2 * 1.01 g/mol

molar mass of Ca(OH)₂ = 74.10 g/mol

mass of Ca(OH)₂ = 63.9 g

moles of Ca(OH)₂ = 63.9 g /(74.10 g/mol)

moles of Ca(OH)₂ = 0.862 moles

In 1 molecule of Ca we have 2 atoms of O. So in 1 mol of Ca(OH)₂ we will have 2 moles of O atoms.

1 mol of Ca(OH)₂ = 2 moles of O atoms

moles of O atoms = 0.862 moles of Ca(OH)₂ * 2 moles of O /1 mol of Ca(OH)₂

moles of O atoms = 1.724 moles

One mol is similar to a dozen. When we say that we need a dozen eggs we know that we need 12 eggs. If we want a mol of eggs, we want 6.022*10^23 eggs. So one mol of something is 6.022 * 10^23 of that.

1 mol of O atoms = 6.022 * 10^23 atoms

n° of O atoms = 1.724 moles * 6.022 * 10^23 atoms/1 mol

n° of O atoms = 1.04 * 10^24 atoms

Answer: In a 63.9 g sample of Ca(OH)₂ we have 1.04 *10^24 atoms of oxygen.

Answer:B

Explanation:

Answer:

need points sorry

Explanation:

The surface temperature of a block of solid carbon dioxide (dry ice) is -78.5 degrees Celsius (-109.8 degrees F). Once it reaches this temperature, carbon dioxide completely bypasses the liquid state and transforms into a gas. One pound of dry ice produces 250 liters of carbon dioxide gas!

Carbon dioxide in the form of dry ice is employed. Sublimation is the process by which CO2 transforms from a solid to a gas without first undergoing a liquid phase, and it takes place at pressures lower than 5.13 atm and temperatures higher than 56.4 °C (216.8 K; 69.5 °F) (the triple point).

When a substance changes immediately from a solid to a gas without melting beforehand. The carbon dioxide is still present; it simply passes.

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Answer:

Sublimation

Explanation:

C

Answer:

C- the breakdown of rock into sediment

Explanation:

Because sedimentary rocks have layers and are made of of those layers which are made up of the breakdown of rock into sediment.

hope this helps:)

An atom is said to be electrically neutral if it has an equal amount of protons and electrons. On the other hand, an atom is electrically charged if its protons and electrons are not distributed evenly.

Neutral atoms are defined as when an atom has an equal amount of protons and electrons, it also has an equal number of electric charges, both positive and negative. As a result, every element in the periodic table has a neutral atomic structure.

Normal atoms have an equal amount of positive and negative particles and a neutral charge. Accordingly, an atom with a neutral charge is one in which the atomic number is matched by the number of electrons.

Thus, an atom is said to be electrically neutral if it has an equal amount of protons and electrons. On the other hand, an atom is electrically charged if its protons and electrons are not distributed evenly.

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The molarity of the NaOH(aq) solution is 0.156 M.

The balanced equation for the reaction between sulfuric acid and sodium hydroxide is H₂SO₄(aq) + 2NaOH(aq) → Na₂SO₄(aq) + 2H₂O(l). From the balanced equation, it can be deduced that the mole ratio of NaOH to H₂SO₄ is 2:1. Hence, the moles of H₂SO₄ reacted = Molarity of H₂SO₄ × Volume of H₂SO₄ used in liters = 0.220 M × 0.03230 L = 0.007106 moles.

Using mole ratio, the moles of NaOH reacted = 2 × 0.007106 = 0.01421 moles. Molarity of NaOH = Moles of NaOH / Volume of NaOH used in liters= 0.01421 moles / 0.04630 L = 0.306 M or 0.156 M (rounded off to three significant figures). Thus, the molarity of the NaOH(aq) is 0.156 M.

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Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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A chemistry graduate student combines 3.90 grams of potassium and 12.7 grams of iodine to form potassium iodide. according to the law of conservation of mass, potassium iodide should be formed after the reaction is complete is 16.70 g.

According to the law of conservation mass, in a chemical reaction mass can neither be created nor destroyed.

According to the law, mass of the reactant is always equal to the mass of product, because in a chemical reaction, mass can neither be created nor destroyed.

The balanced chemical reaction is -

2 K      +       I₂    →      2 KI

3.90 g  +   12.7 g   =   16.70 g

16.70 g                  =   16.70 g

Therefore, when the reaction proceeds to completion, 16.70 g product is obtained as the sum of reactants is 16.70 g and according to law of conservation of mass, mass is neither created nor destroyed but it only converts from one form to another form.

Hence, potassium iodide formed is 16.70 g.

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The chemical formula of muscovite is given as (KF)₂(Al₂O₃)₂(SiO₂)(H₂O).

The mineral muscovite is very useful in the formation of rocks. It is composed of  aluminum and potassium in the hydrated form and is part of the mica family. It can be found in  igneous, metamorphic, and sedimentary rocks.

Rocks are massive structures which could be found above or below the earth's surface. They are formed by molten magma or by the deposition of materials in layers overtime. Some types of rocks are formed from changes in existing rocks.

The Muscovite could be used in cosmetics as well as to make a paint to shine The chemical formula of muscovite is given as (KF)₂(Al₂O₃)₂(SiO₂)(H₂O). We can see that it contains the elements aluminum, potassium and silicon.

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Answer:

It can mean "boardwalk" or a "board of a school."

~Mia Sedillo~

Answer:

The atomic number or proton number of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus

Explanation:

Can I get a brainliests please ☺️

C/ If Fe is greater than Fg, the negatively charged oil droplet will move freely toward the negatively charged plate.

In the Millikan oil droplet experiment, the negatively charged oil droplets are subjected to an electric field created by the charged plates. The electric force (Fe) acts on the oil droplet in a direction opposite to the gravitational force (Fg). When Fe is greater than Fg, the electric force overcomes the gravitational force, causing the negatively charged oil droplet to experience an upward force. As a result, the oil droplet moves freely upward toward the negatively charged plate.

Option B is incorrect because if Fe is equal to Fg, the forces balance each other, resulting in a stationary droplet. However, the question states that Fe is increased until it is greater than Fg, implying that the droplet is no longer stationary but moves in response to the electric force.

Therefore, option C is the correct answer, as it describes the effect of an electric field on the motion of a negatively charged oil droplet in the Millikan oil droplet experiment.

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In terms of increasing strength of intermolecular forces, with the weakest at the top of the list, the order for the given compounds would be:

A. CH3CH2CH2CH3 (n-butane)

B. CH3COON (ethyl ethanoate)

C. CH3CH2OCH3 (dimethyl ether)

D. CH3CH2CH2OH (1-butanol)

The intermolecular forces in these compounds can be ranked as follows:

1. A. CH3CH2CH2CH3 (n-butane): This compound consists of nonpolar covalent bonds and experiences only weak London dispersion forces between its molecules.

2. B. CH3COON (ethyl ethanoate): Ethyl ethanoate contains polar covalent bonds, and the intermolecular forces include London dispersion forces as well as dipole-dipole interactions. However, the dipole-dipole interactions are relatively weaker than the next two compounds.

3. C. CH3CH2OCH3 (dimethyl ether): Dimethyl ether has polar covalent bonds, leading to London dispersion forces and dipole-dipole interactions. The oxygen atom creates a stronger dipole moment than in ethyl ethanoate, resulting in slightly stronger intermolecular forces.

4. D. CH3CH2CH2OH (1-butanol): 1-butanol contains polar covalent bonds and experiences London dispersion forces, dipole-dipole interactions, and hydrogen bonding. Hydrogen bonding is the strongest intermolecular force among the four compounds, as the hydrogen atoms are directly bonded to the highly electronegative oxygen atom.

Thus, the correct order from weakest to strongest intermolecular forces is A < B < C < D.

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The total heat required to convert the ice to steam is 155,000 J.

The given parameters:

The heat required to raise the temperature to 0⁰C is calculated as;

\(Q = mc\Delta t\\\\Q_1 = 50 \times 4.184 \times (0 - (-10))\\\\Q_1 = 2092 \ J\)

The  heat required to melt the ice is calculated as follows;

\(Q_2 = mL_f\\\\Q_2 = 50 \times 333.55 \\\\Q_2 = 16,677.5 \ J\)

The heat raise the temperature to 100⁰C is calculated as;

\(Q_3 = 50 \times 4.184 \times (100 - 0)\\\\Q_3 = 20,920 \ J\)

The  heat required to boil the water is calculated as follows;

\(Q_4 = mL_v\\\\Q_4 = 50 \times 2230\\\\4_4 = 111,500 \ J\)

The heat raise the temperature to 120⁰C is calculated as;

\(Q_5 = 50 \times 4.184 \times (120 - 100)\\\\Q_5 = 4,184 \ J\)

The total heat required is calculated as follows;

\(Q_t = Q_1 + Q_2 + Q_3 + Q_4 + Q _5 \\\\Q_t = 2092 + 16,677.5 + 20,920 + 111,500 + 4,184\\\\Q_t = 155,373.5 \ J\\\\Q_t \approx 155,000 \ J\)

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Answer:

B.

Explanation:

Thus we can see that the mass of protons and mass of neutrons are approximately equal.

Answer:

for pH 13 it = strong based the ph 2 is= weak acid

Explanation:

Answer:

0.287 M

Explanation:

Multiply the concentration of each solution by the volume of each (in liters) to get the moles of NaOH in that solution.

0.15 M • 5.4000 L = 0.81 mol NaOH

4.0 M • 0.2012 L = 0.80 mol NaOH

Add the mol of NaOH together to get the total --> 0.81 + 0.80 = 1.61 mol NaOH

Divide by the total volume of solution (5400.0 mL + 201.2 mL = 5,601.2 mL = 5.6012 L)

1.61 mol / 5.6012 L = 0.287 M NaOH

The amount of solvent required to carry out the dilution will be 120 mL.

The concentration of the initial solution is 60% lansoprazole suspension, and the desired concentration is 40% lansoprazole suspension. To calculate the volume of solvent required to carry out the dilution, we can use the following formula:

C₁V₁ = C₂V₂

Where C₁ is the concentration of the initial solution, V₁ is the volume of the initial solution, C₂ is the desired concentration, and V₂ is the volume of the final solution.

Since the volume of the final solution is known (360 mL), we can rearrange the equation to solve for V1:

V1 = (C₂V₂) / C₁

V1 = (40% × 360 mL) / 60%

V1 = 240 mL

So the initial volume of the 60% lansoprazole suspension is 240 mL. To this volume, 360 mL - 240 mL = 120 mL of solvent is required to carry out the dilution to 40%. Therefore, the amount of solvent required is 120 mL.

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Answer: Calcium ion Ca² : 1 s² 2s² 2p ^6 (sorry I don't get 6 similar way as 2) 3s² 3p^6

Also 18 electrons, because Calcium donates two 4s electrons

Explanation:

The molar solubility of mercury (II) bromide (HgBr2) is 7.00 × 10^-7 M. This is the long answer to the problem.

To perform calculations using Ksp for the given equilibrium HgBr2(s)  ↔ Hg2+(aq) + 2Br-(aq) and find the molar solubility of mercury (II) bromide (HgBr2) we have to use the solubility product expression.Ksp for HgBr2 is 6.2 × 10^-20Ksp = [Hg2+][Br-]^2 Since the initial concentration of HgBr2 is given as s, and after dissociation, the concentration of Hg2+ becomes s, while the concentration of Br- becomes 2s.[Hg2+] = s M and [Br-] = 2s MThus,Ksp = [Hg2+][Br-]^2= s(2s)^2= 4s^3= 6.2 × 10^-20Molar solubility of HgBr2 is given as s, therefore;s = (6.2 × 10^-20/4)1/3s = 7.00 × 10^-7 M

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To determine whether the given percentage composition matches the theoretical composition of phencyclidine, we need to calculate the theoretical percentage composition of C, H, and N in phencyclidine and compare it with the given values.

The molar mass of phencyclidine (C17H25N) can be calculated as:

Molar mass = (17 x atomic mass of C) + (25 x atomic mass of H) + (1 x atomic mass of N)

          = (17 x 12.011) + (25 x 1.008) + (1 x 14.007)

          = 243.349 g/mol

The theoretical percentage composition of C, H, and N in phencyclidine can be calculated as follows:

Percentage of C = (17 x atomic mass of C x 100) / molar mass

               = (17 x 12.011 x 100) / 243.349

               = 83.54%

Percentage of H = (25 x atomic mass of H x 100) / molar mass

               = (25 x 1.008 x 100) / 243.349

               = 10.36%

Percentage of N = (1 x atomic mass of N x 100) / molar mass

               = (1 x 14.007 x 100) / 243.349

               = 5.10%

Therefore, the theoretical percentage composition of C, H, and N in phencyclidine is 83.54%, 10.36%, and 5.10%, respectively.

Comparing the theoretical and given percentage compositions, we can see that the values are very close. The given percentage composition of 83.71% C, 10.42% H, and 5.61% N are within acceptable limits of the theoretical values. Therefore, we can conclude that the sample is consistent with phencyclidine.

Note: small differences between the theoretical and experimental values can occur due to experimental errors and uncertainties.

Answer:

A.

Explanation:

A chemical formula tells us the number of atoms of each element in a compound.

It contains the symbols of the atoms of the elements present in the compound as well as how many there are for each element in the form of subscripts.

For outside treatment:

The cost is a fixed $15,000 per year for the entire 9-year period.

Therefore, the EUAC for outside treatment is simply $15,000.

Comparing the EUAC values, we find that the EUAC for in-house treatment is approximately $6,329, while the EUAC for outside treatment is $15,000.

To calculate the equivalent uniform annual cost (EUAC) of each alternative and determine the most economical option, we need to analyze the costs over the 9-year period.

For in-house treatment:

The cost in the first year is $30,000, and the cost declines by $3,000 each year. We can use the arithmetic gradient formula to calculate the equivalent uniform annual cost.

Using the formula for an arithmetic gradient, the EUAC for in-house treatment can be calculated as follows:

EUAC = C - (G/A) * (1 - (1 + i)^(-n))

Where:

C = Initial cost = $30,000

G = Gradient (decrease per year) = -$3,000

A = Annuity factor (obtained from the interest and annuity table for discrete compounding) for 9 years at 8% MARR = 6.71008 (rounded)

i = Interest rate = 8% = 0.08

n = Number of years = 9

Substituting the values into the formula:

EUAC = $30,000 - (-$3,000/6.71008) * (1 - (1 + 0.08)^(-9))

EUAC ≈ $6,329 (rounded)

For outside treatment:

The cost is a fixed $15,000 per year for the entire 9-year period.

Therefore, the EUAC for outside treatment is simply $15,000.

Comparing the EUAC values, we find that the EUAC for in-house treatment is approximately $6,329, while the EUAC for outside treatment is $15,000.

Since the EUAC for in-house treatment is lower, it is the more economical alternative for processing waste liquids.

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The property of matter that is conserved in chemical reactions and shown by balanced equations is known as the Law of Conservation of Mass. According to this law, mass can neither be created nor destroyed in a chemical reaction; it can only be transformed from one form to another.For instance, when two substances are combined, they react and form a new substance.

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The two conditions that can cause water or liquids to backflow into a water system are back siphonage and back pressure. Option (d) is the correct answer.

Back siphonage occurs when there is a sudden decrease in water pressure in the water supply system, causing the water to flow in the opposite direction, leading to backflow. This can happen when there is a break in the main water supply line, or when there is a sudden high demand for water, such as during firefighting activities. Backpressure, on the other hand, occurs when the pressure in the downstream water system is higher than the pressure in the upstream water system.

This can happen when a pump is connected directly to a potable water system without proper backflow prevention devices or when a boiler or other heating device is connected to a water system without proper safety valves. Both of these conditions can result in contaminated or unsafe water entering the potable water supply, leading to health hazards and water quality issues. It is important to have proper backflow prevention devices installed and regularly maintained to prevent such occurrences.

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Answer:

Explanation:

The arrow symbol in a chemical equation separates the reactants from products. A chemical reaction is process in which chemical changes leads to the formation of products from reactants.

Answer: b

Explanation: its b

re write the question.

Explanation:

it seems incomplete.