calculate the ph of a solution formed by mixing 250.0 ml of 0.900 m nh4cl with 250.0 ml of 1.60 m nh3. the kb for nh3 is 1.8 × 10-5.

The amount of heat gained by the water is 500 calories. Thus, option D is correct.

Given:

Mass of water (m) = 100 g

Change in temperature (ΔT) = 30°C - 25°C = 5°C

The specific heat capacity of water (c) is approximately 1 calorie/gram°C.

Now, the amount of heat gained by the water,

Q = mcΔT

Where:

Q is the heat gained or lost by the substance

m is the mass of the substance

c is the specific heat capacity of the substance

ΔT is the change in temperature

Plugging in the values into the formula:

Q = 100 × 1 × 5

Q = 500 calories

Therefore, the amount of heat gained by the water is 500 calories.

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Answer:

protons and neutrons

Explanation:

The nucleus of the atom contains protons and neutrons. The electrons of the atom orbit the nucleus.

Answer:

Its a

Explanation:

i took the quiz

The sentence that is inappropriate in an informational piece of writing with a formal tone is "People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play." The correct option is A.

In academic or professional settings, a formal writing tone is common. This tone emphasizes thoroughness and directness while remaining respectful.

It emphasizes facts and grammatical correctness and uses full words rather than contractions.

The use of standard English, more complex sentence structures, the infrequent use of personal pronouns, and the absence of colloquial or slang terms characterize formal language.

In informal language, nonstandard English forms, colloquial vocabulary, and typically shorter sentence structures are permitted.

"People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play," is an inappropriate sentence in a formal informational piece of writing.

Thus, the correct option is A.

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Answer:

20 atoms total

Explanation:

N (3) + H (12) + P (1) + O(4) = 20 atoms

Answer:

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Which is the best metal to use in an alloy to increase its electrical conductivity?

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Silver(Ag)..........

From the options The metal that would increase the electrical conductivity of an alloy is ; Silver ( Ag )

Silver ( Ag ) with an electrical conductivity of 6.3x10⁷ m/ohm is the best electrical conductor in its pure state. although aluminum and copper are good conductors of electricity.  Silver been the best conductor should be the best metal to be used in an alloy to increase the electrical conductivity of the alloy.  

Hence we can conclude that The metal that would increase the electrical conductivity of an alloy is ; Silver ( Ag

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The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

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Answer:

Option d is correct

Explanation:

The basis of the VSEPR model of molecular bonding is that to minimize repulsions, electron domains in the valence shell of an atom arrange on their own.

According to VSEPR theory, if there are two electron domains on a central atom, they will be arranged such that the angles between the domains are 180°

The mass of (NH4) 2S in the solution is : Mass = 0.0600 mol × 60.08 g/mol = 3.60 g.

The given molarity and volume of the solution can be used to calculate the number of moles of ammonium sulfide (NH4)2S.Then, the number of moles can be converted to mass using the molar mass of (NH4)2S.Mass of ammonium sulfide (NH4)2S in 3.00 L of a 0.0200 M solution is given by : Mass = moles × molar mass.The number of moles of (NH4)2S can be found using the equation:Molarity = Number of moles / Volume.Rearranging this equation, we get:Number of moles = Molarity × Volume Number of moles of (NH4)2S = 0.0200 M × 3.00 L.Number of moles of (NH4)2S = 0.0600 mol.The molar mass of (NH4)2S can be calculated by summing the molar masses of ammonium (NH4) and sulfide (S) ions.Molar mass of (NH4)2S = (2 × Molar mass of NH4) + Molar mass of S= (2 × 14.01 g/mol) + 32.06 g/mol= 60.08 g/mol.

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Explanation:

my answere is drought the first option

Answer:

The spectra can be divided into two types viz., emission and absorption spectra. The differences between them are given below. 1) The emission spectrum is obtained due to emission of radiation from the substances. The absorption spectrum is obtained when the substance absorbs the radiation.

Explanation:

Lewis Dot (Electron-Dot) Structures are used to depict the valence electrons of an atom in an easy way. To create a Lewis dot structure for any element, you must first know its valence electrons.

The electrons in the outermost shell of an atom are referred to as valence electrons, and they participate in chemical reactions. Each dot in the Lewis structure represents a valence electron of the element. When representing the Lewis structure for an element with more than four valence electrons, dots may also be placed around the symbol in the shape of a triangle, a square, or a pentagon.

Here are the Lewis structures of the given neutral atoms:

Carbon (C):C has 4 valence electrons, which means there are four dots on the Lewis structure:

Oxygen (O):O has 6 valence electrons, which means there are six dots on the Lewis structure

:Nitrogen (N):N has 5 valence electrons, which means there are five dots on the Lewis structure:

Hydrogen (H):H has 1 valence electron, which means there is one dot on the Lewis structure:

Helium (He):He has 2 valence electrons, which means there are two dots on the Lewis structure:

As we have completed all Lewis Dot (Electron-Dot) structures for the given neutral atoms,

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The complete question is-

"How many valence electrons and dots are there in the Lewis Dot (Electron-Dot) structures for the following neutral atoms: carbon, oxygen, nitrogen, hydrogen, and helium?"

Answer:

*Ions

*Cation

*Anion

*Monoatomic ion

*Electrostatic forces

When phenol is prepared industrially in the process that involves the formation and oxidation of cumene, then industrially important by-product acetone is formed.

When oxidation of cumene takes place in the presence of air, cumene hydroperoxide is obtained. Phenols are obtained on further treatment of cumene hydroperoxide with dilute acid,  Acetone is produced as one of the by-products of this reaction.

The process of acidifying sodium salt results in phenol. A diazonium salt is created by reacting an aromatic primary amine with nitrous acid (NaNO2 + HCl) at 273-278 K. By heating diazonium salts in water or subjecting them to weak acids, phenols are produced as a byproduct.

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Answer: 13.11L

Explanation:

17 g = 22.4 L

10g = 13.11 L

The one that is accompanied by the lactic acid formation is the Anaerobic glycolysis.

The Lactic acid will be mainly produced in the muscle cells and the red blood cells. It will forms when the body will breaks down the carbohydrates in to the use for the energy when the oxygen levels are low.

The Anaerobic glycolysis can be define as the energy production in the cells that cannot be produce the adequate energy through the oxidative phosphorylation. In the poorly oxygenated tissue, the glycolysis produces the 2 ATP by shunting the pyruvate away from the mitochondria and via the lactate dehydrogenase reaction.

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A chemical that bonds to the active site of an enzyme, thus blocking its function, is known as a competitive inhibitor.

A competitive inhibitor is a type of inhibitor that binds to the active site of an enzyme, preventing the substrate from binding and blocking the enzyme's function.

The active site is the specific region of the enzyme where the substrate binds and undergoes a chemical reaction.

By occupying the active site, the competitive inhibitor competes with the substrate for binding, reducing the enzyme's catalytic activity.

The term "competitive" refers to the competition between the inhibitor and the substrate for binding to the active site.

When the concentration of the competitive inhibitor is high, it becomes more likely to bind to the active site, reducing the availability of the active site for the substrate.

However, the binding of a competitive inhibitor can be reversed by increasing the substrate concentration, as it can outcompete the inhibitor and regain access to the active site.

Competitive inhibitors are important in understanding enzyme kinetics and designing drugs that target specific enzymes.

By selectively blocking enzyme activity, competitive inhibitors can regulate biological processes and serve as potential therapeutic agents.

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The term mole concept is used here to determine the mass of butane. The mass of butane needed to produce 47.6 grams of H₂O is 30.68 g.

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:

Number of moles = Given mass / Molar mass

Here the balanced equation is:

2 C₄H₁₀ + 13 O₂ --> 8 CO₂ + 10 H₂O

From the equation, we can see that 10 moles of H₂O are produced for every 2 moles of C₄H₁₀ used. We can use this ratio to convert the given mass of H₂O to the corresponding mass of C₄H₁₀.

mass of H₂O = 47.6 g

moles of H₂O =  47.6 g / 18.02 g/mol = 2.64 mol

moles of C₄H₁₀ = (2.64 mol H₂O) / (10 mol H₂O / 2 mol C₄H₁₀) = 0.528 mol C₄H₁₀

molar mass of C₄H₁₀ = 58.12 g/mol

mass of C₄H₁₀ = 0.528 mol x 58.12 g/mol ≈ 30.68 g

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Elements below and above each other belongs to same group.

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Answer:

The ratio of the particles that make it up is fixed

Explanation:

When pentanoyl chloride (CH3CH2CH2CH2COCl) is treated with an excess of NH3 (ammonia) as the reagent, an amide is formed as the organic product.

The structure of this product is CH3CH2CH2CH2CONH2.

Here is a step-by-step explanation:

1. The nucleophile, NH3, attacks the carbonyl carbon of the pentanoyl chloride.
2. The carbonyl oxygen gains a positive charge as the double bond shifts to the oxygen.
3. A bond forms between the carbonyl carbon and the nitrogen from NH3.
4. The chloride ion, Cl-, acts as a leaving group and takes away the positive charge from the oxygen by breaking the bond with the carbonyl carbon.
5. The final product is an amide, with the structure CH3CH2CH2CH2CONH2.

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The molarity of lead(II) ion in the original solution is 0.0112 M.

The balanced chemical equation for the reaction between lead(II) nitrate and sodium iodide is:

Pb(NO3)2 + 2 NaI → PbI2 + 2 NaNO3

From this equation, we can see that 1 mole of lead(II) nitrate reacts with 2 moles of sodium iodide to produce 1 mole of lead(II) iodide precipitate.

First, let's calculate the number of moles of lead(II) iodide precipitate formed in the reaction:

mass of PbI2 = 0.699 g

The molar mass of PbI2 is 461.01 g/mol, so the number of moles of PbI2 formed is:

moles of PbI2 = 0.699 g ÷ 461.01 g/mol = 0.001515 mol

Since the reaction is between lead(II) nitrate and sodium iodide, the number of moles of lead(II) nitrate present in the solution can be calculated using the stoichiometry of the balanced chemical equation:

moles of Pb(NO3)2 = 1/2 × moles of PbI2 = 0.0007575 mol

Now, we can calculate the molarity of lead(II) ion in the original solution using the volume of the lead(II) nitrate solution:

volume of Pb(NO3)2 solution = 67.9 mL = 0.0679 L

Molarity of Pb2+ = moles of Pb(NO3)2 / volume of Pb(NO3)2 solution

Molarity of Pb2+ = 0.0007575 mol / 0.0679 L = 0.0112 M

Therefore, the molarity of lead(II) ion in the original solution is 0.0112 M.

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- The atmospheric pressure in Denver, Colorado, is approximately 0.829 atm.

- The atmospheric pressure in Denver, Colorado, is approximately 627.522 torr.

The atmospheric pressure in Denver, Colorado, is usually about 84.0 kPa. To convert this pressure to atm and torr units, we can use the following conversion factors:

1 atm = 101.325 kPa

1 atm = 760 torr

First, let's convert 84.0 kPa to atm:

Pressure in atm = 84.0 kPa × (1 atm / 101.325 kPa) ≈ 0.829 atm

Therefore, the atmospheric pressure in Denver, Colorado, is approximately 0.829 atm.

Next, let's convert 84.0 kPa to torr:

Pressure in torr = 84.0 kPa × (760 torr / 101.325 kPa) ≈ 627.522 torr

Therefore, the atmospheric pressure in Denver, Colorado, is approximately 627.522 torr.

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Answer: Helium is an type of air that can be used to inflate balloons, balls,  and other things that require air. The carbon dioxide we breath out is similar to this helium.

Hope this helps!

\(^{10}_{4} \text{Be} \longrightarrow ^{0}_{-1} \beta+^{10}_{5} \text{B}\)

Answer:

it have been already balanced

2H2 + O2 = 2H2O.

Answer:

The measurement between to points is known as the distance

Answer:

One type of cleaner that is highly effective for removing mineral deposits is an acid-based cleaner.

Explanation:

Mineral deposits, such as limescale, rust, or hard water stains, can be stubborn and difficult to remove. Acid-based cleaners are specifically formulated to dissolve and break down these mineral deposits. The acidic properties of these cleaners work by reacting with the minerals, causing them to loosen and dissolve, making it easier to remove them from various surfaces.

Two commonly used acid-based cleaners for removing mineral deposits are vinegar and lemon juice. Vinegar, which contains acetic acid, can be applied directly or used as a soak to effectively remove mineral deposits on surfaces.

A mineral deposit refers to the accumulation or concentration of minerals in a specific location or geological formation. It occurs through natural processes over extended periods of time. Mineral deposits can be found in various forms, such as solid masses, veins, or scattered grains within rocks or sediments.

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One type of cleaner that is highly effective for removing mineral deposits is an acid-based cleaner. Mineral deposits, such as those caused by hard water or limescale, are often composed of calcium, magnesium, and other minerals that can be dissolved by acidic substances.

Acid-based cleaners work by reacting with the mineral deposits, breaking them down and dissolving them. Common examples of acid-based cleaners include vinegar (acetic acid), lemon juice (citric acid), and commercial descaling products that contain stronger acids like hydrochloric acid or phosphoric acid. The acidic nature of these cleaners allows them to effectively remove mineral deposits from various surfaces, such as sinks, faucets, showerheads, and toilet bowls. The acids react with the minerals, causing them to dissolve and be easily wiped or rinsed away. However, it's important to exercise caution when using acid-based cleaners as they can be corrosive to certain materials, such as marble or some types of metal. It's recommended to follow the manufacturer's instructions and test the cleaner on a small, inconspicuous area before applying it to the entire surface.

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The amplitudes of sound waves from these sources in order from greatest to least is chainsaw, diesel truck, rustling leaves.

A sound wave is described as the pattern of disturbance caused by the movement of energy traveling through a medium (such as air, water or any other liquid or solid matter) as it propagates away from the source of the sound.

The amplitude of the sound wave is described as the maximum displacement of the particles from their resting position. That means that higher the amplitude equals high sound.

So the sound of a chainsaw is high, hence its amplitude will be great and after that the amplitude of diesel truck is high and rustling leaves have the lowest amplitude.

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Answer:

50g

Explanation:

moalr mass of CaCO3= 40g/mol+ 12g/mol+(16g/mol*3)

                                   =52g/mol+48g/mol

                                   =100g/mol

1 mol= 100g

0.5mol=x

by cross multiplication,

0.5*100gmol=x mol

x=50g

Answer:

It has become evident in recent years that established water policies, under the current laws and management regimes that have allowed a flourishing agriculture and economy in the Southwest, are not appropriate to the challenges facing water demand in the 21st century. Yet only limited institutional and policy steps have been taken to develop new tools and approaches addressing these challenges. The circumstances listed below illustrate some of the more important unsustainable aspects of water use in the Southwest.