A buffer that contains 1.05 M B and 0.750 M BH⁺ has a pH of 9.50. What is the pH after 0.0050 mol of HCl is added to 0.500 L of this solution?

\(4.05 * 10 ^{4}\)

To find the pressure in kPa we use the conversion

1 atm = 101.3 kPa

If 1 atm = 101.3 kPa

400 atm = 400 × 101.3 = 40520 kPa

Expressing it in standard form we have the final answer as

4.05 × 10⁴ kPa

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere (atm) is equal to this pressure, and the torr is defined as 1⁄760 of this. Manometric units such as the centimeter of water, millimetre of mercury, and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer.

P = F / A

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Answer:

When fireworks explode in the sky, the gunpowder reactions create a lot of heat, causing the metallic substances pres- ent in the stars to absorb energy from the heat and emit light. ... These electrons absorb energy from the heat, which causes them to move from their original ground-energy state to an excited state.

Explanation:

:))

The process which generates energy in sun and other stars is nuclear fusion. The emission of light energy is thus the result of fusion reaction taking place in stars.

Nuclear fusion is a chemical process in which two light nuclei or isotopes of an atom fuse together to form a heavy nuclei with the release of million tons of energy.

The process in which a heavy atom breaks into lighter atoms is called nuclear fusion and it is also releasing massive energy but less than the from fusion because, the breaking of chemical bonds needs some energy to absorb.

Fusing two chemical bonds is needs no more energy and it is an energy releasing process. Millions of hydrogen atoms and its isotopes fuse together in several steps and form helium atoms.

This process of release million tons of heat energy and light energy. This will make the stars glow.

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1. The coefficient (green) is 45

2. The exponent (yellow) is 9

To convert from giga grams (Gg) to grams (g), the following coversion scale can be use:

1 Gg = 10⁹ g

With the above convesion scale, we can convert 45 Gg to g as follow

1 Gg = 10⁹ g

Therefore,

45 Gg = 45×10⁹ g

Thus, 45 Gg is equivalent to 45×10⁹ g. Hence, we can conclude as follow:

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There are 0.100 moles of calcium carbonate (CaCO₃) present in 10 grams of the substance.

To find the number of moles of a substance, you can use the formula:

moles = mass / molar mass

First, we need to find the molar mass of calcium carbonate (CaCO₃). The molar mass of a compound is the sum of the molar masses of each element in the compound.

So, the molar mass of calcium carbonate (CaCO₃) is:

CaCO₃ = 40 + 12 + (16 x 3) = 100

Now, we can use the formula to find the number of moles:

moles = mass / molar mass = 10 / 100 = 0.100

Therefore, there are 0.100 moles of calcium carbonate (CaCO₃) present in 10 grams of the substance.

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Answer:

0.659 mol

Explanation:

n(NH3)/n(N2) = 4/5

n(NH3) = 4/5×0.824

= 0.659 mol

The balanced equation in which ammonia reacts with nitrogen monoxide to produce nitrogen and water. 4NH3(g) + 6NO(g) → 5N2(g) + 6H2O. 0.659 moles of NH3 are necessary to produce 0.824 mol N2.

The term balanced chemical equation is defined as  has number atoms of each element equal on both left and right sides of the reaction.

The chemical equation must be balanced in order to obey the law of conservation of mass. When the number of different atoms of elements in the reactants side equals the number of atoms in the products side, the chemical equation is balanced.

The balanced chemical equation is as follows:

4NH3(g) + 6NO(g) → 5N2(g) + 6H2O

n (NH3) / n(N2) = 4 / 5

n (NH3) = 4 / 5 × 0.824

= 0.659 mol

Thus, 0.659 moles of NH3 are necessary to produce 0.824 mol N2.

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In a solution of magnesium ions and sulfate ions, if the reaction quotient is less than the solubility product, all ions remain solvated.

When the reaction quotient (Q) is less than the solubility product (Ksp), it indicates that the concentrations of the dissolved ions in the solution are below the equilibrium concentrations. In this case, the solution is not saturated and there is no excess of ions to form a precipitate. Instead, the ions continue to stay in their solvated state, meaning they are surrounded by water molecules and are dispersed evenly throughout the solution. Therefore, in the given scenario, when the reaction quotient is less than the solubility product, there is no precipitation or formation of an emulsion. All ions remain solvated in the solution.

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The concentration of A and B after 80 s  if the initial concentration of ab is 0.260 m, and the reaction mixture initially contains no products is 0.0091 M.

To find the concentrations of A and B after 80 s, we must write the kinetic data is given as follows for the reaction:

AB ⟶ A + B

Initial rate of the reaction is 1.62 x 10⁻³ mol/L/s

Order of reaction for AB is first order (n = 1). Now, using the first-order rate equation, the concentration of AB at time t, [AB]t can be calculated as follows:

ln [AB]0/[AB]t = k

tHere, [AB]0 is the initial concentration of AB, [AB]t is the concentration of AB at time t, k is the rate constant, and t is the time interval.

To determine the rate constant, we can use the initial rate of reaction.

Initial rate, ri = k[AB]n

Here, n is the order of reaction.

So, k = ri/[AB]n

Substituting the given values:

ri = 1.62 x 10⁻³ mol/L/s[AB]0

= 0.260 mk = ri/[AB]n

= 1.62 x 10⁻³ mol/L/s / (0.260 m)1

= 6.23 s-1

Now, we can use the rate constant to determine the concentration of AB at 80 seconds:

ln [AB]0/[AB]80 = kt

Here, k = 6.23 s-1, [AB]0 = 0.260 m, and t = 80 s.

Substituting the values:

ln (0.260 m)/[AB]80

= (6.23 s-1) (80 s)[AB]80

= [AB]0 e-kt

= (0.260 m) e-(6.23 s-1) (80 s)

= 0.0091 m

Now, since the stoichiometry of the reaction is 1:1, the concentration of A and B will be equal to each other. Therefore, [A]80 = [B]80 = 0.0091 m.

Thus, the final concentrations of A and B are 0.0091 M after 80 seconds.

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The number of moles of NaCl contained in 5 L of a 2.2 M solution is 11 moles

The molarity of a solution gives a relationship between volume and mole of substance. The mathematical relationship is given below:

Molarity = number of mole / Volume

With the above formula, we can determine the number of mole of NaCl in the solution. Details below:

Molarity = number of mole / Volume

Cross multiply

Number of mole = molarity × volume

Number of mole of NaCl = 2.2 × 5

Number of mole of NaCl = 11 moles

Thus, the number of moles of NaCl is 11 moles

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Answer: a compound!

Explanation: a compound is something that contains two or more elements that are chemically combined in a fixed proportion!

A solution is composed of a solute dissolved in a solvent. Solute refers to the minor component in a solution that is dissolved in the solvent while solvent refers to the major component of a solution that is responsible for dissolving the solute.

Identifying the solvent and solute in the given solutions:

a. White gold is a solid solution containing 58.3% gold, 17.0% copper, 7.7% zinc, and 17.0% nickel. In the given solution, gold, copper, zinc, and nickel are components. Out of these, the metal component with the highest percentage is gold. Therefore, the solvent in this case is gold. Copper, zinc, and nickel are solutes.

b. Clean, dry air contains about 78.1% nitrogen, 21.0% oxygen, 0.9% argon, and very small amounts of other gases.In this solution, nitrogen is the component that has the highest percentage. Therefore, nitrogen is the solvent in this solution while oxygen, argon, and other gases present are the solutes.

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The correct option from the given statements concerning mixtures is (d) more than one correct response.

The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.

The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).

The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.

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The number of moles of water vapor formed in the reaction is 0.158 moles

The ideal gas equation shows the relationship between number of moles, temperature, volume and pressure.

Now;

P = 122.3 kilopascals or 1.21 atm

V = 5.4 L

T = 730°c or 1003 K

n = ?

R = 0.082 atmLK-1mol-1

PV = nRT

n = PV/RT

n =  1.21  *  5.4/0.082 * 1003

n = 6.53/82.2

n = 0.079 moles

The equation of the reaction is; O2 (g) + 2H2(g) ---->2H2O(g)

If 1 mole of O2 formed 2 moles of H2O

0.079 moles of O2 yield x moles of H2O

x = 0.079 * 2/1

= 0.158 moles

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The number of moles in container 2 is 33.3moles when the container has 27.32L of gas inside it

The number of moles of gas in container 2 can be calculated using the Ideal Gas Law:  

n = PV/RT  

where n is the number of moles of the gas with known volume,

P is the pressure (assumed to be 1 atm for ideal gases),

V is the volume (27.32 liters),

R is the ideal gas constant (0.0821 L·atm/mol·K) and

T is the temperature (assumed to be 273.15 K).  

Plugging in the values, we get:  

n = (1 atm)(27.32 L)/(0.0821 L·atm/mol·K)(273.15 K)

n = 33.3 mol  

Therefore, there are 33.3 moles of gas in container 2.

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The [OH⁻] of the solution is approximately 7.14 x 10⁻¹³ M, and the pH is approximately 5.85.

To determine the [OH⁻] and pH of a solution, we need to consider the concentration of hydroxide ions ([OH⁻]) or the hydronium ions ([H₃O⁺]). In this case, we are given the concentration of fluoride ions (F⁻), which is the conjugate base of hydrofluoric acid (HF). Since HF is a weak acid, it partially dissociates in water to produce F⁻ and H₃O⁺ ions.

The concentration of F- ions is given as 0.140 M. To find the [OH⁻], we can use the fact that [OH⁻] = Kw / [H₃O⁺], where Kw is the ion product of water (approximately 1.0 x 10⁻¹⁴ M² at 25°C).

Assuming the [H₃O⁺] concentration is equal to the F- concentration, we can calculate the [OH⁻] as follows:

Kw = [H₃O⁺][OH⁻]

1.0 x 10⁻¹⁴ = (0.140)([OH⁻])

[OH-] = (1.0 x 10⁻¹⁴) / (0.140)

[OH-] ≈ 7.14 x 10⁻¹³ M

To find the pH, we can use the relationship pH = -log[H₃O⁺]. Since [H₃O⁺] is assumed to be equal to the F⁻ concentration, we can calculate the pH as follows:

pH = -log(0.140)

pH ≈ 5.85

Therefore, the [OH⁻] of the solution is approximately 7.14 x 10⁻¹³ M, and the pH is approximately 5.85.

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The complete question is:

Determine the [OH-] and pH of a solution that is 0.140 M in F-.

There are approximately 0.38133 moles of nitrogen in the sample of epinephrine. Epinephrine is both a neurotransmitter and a hormone, but it acts mainly as a hormone. Epinephrine, also known as adrenaline, plays an important role in your body's fight-or-flight response. It's also used as a medication to treat many life-threatening conditions

To determine the number of moles of nitrogen in the sample of epinephrine, we need the molar ratio between carbon and nitrogen in the compound. Without this information, we cannot provide a direct answer. The molar ratio can be obtained from the chemical formula of epinephrine (C9H13NO3), which indicates that there is 1 nitrogen atom for every 9 carbon atoms.

Using this information, we can set up a proportion:

(Number of moles of nitrogen) / (Number of moles of carbon) = (Number of nitrogen atoms) / (Number of carbon atoms)

Since we know the number of moles of carbon is 3.432, we can solve for the number of moles of nitrogen:

(Number of moles of nitrogen) / 3.432 = 1/9

Cross-multiplying, we get:

(Number of moles of nitrogen) = (3.432 * 1) / 9

Calculating the result:

(Number of moles of nitrogen) = 0.38133 moles

Therefore, there are approximately 0.38133 moles of nitrogen in the sample of epinephrine.

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Answer:

correct is A, but it isn't quite right. Only when the electronegativity values of the two atoms are the same will the bond be 100% covalent.

When drawing the Lewis structure of a molecule, start by determining the total number of available valence electrons based on each element's group number. Then, use the total number of electrons needed for each element to be stable, generally based on its charge, to determine the ionic charge by finding the difference between the number of needed and available electrons divided by two.

For example, for a neutral oxygen atom in Group 6A or 16, it has six valence electrons. To achieve a stable octet, it needs two more electrons, which makes its ionic charge -2. Similarly, a nitrogen atom in Group 5A or 15 has five valence electrons, and it needs three more electrons to achieve a stable octet, which makes its ionic charge -3.

Once you have determined the ionic charges for each element in the molecule, you can start constructing the Lewis structure by placing the atoms in a way that satisfies the octet rule, where each atom (except hydrogen) has eight electrons in its outermost shell

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Answer:

rate of change

Explanation:

Answer:

see below

Explanation:

All of them are considered reactants because a reactant is a a substance that takes part in and undergoes change during a reaction.

Answer:

D. How several food chains are related

Explanation:

Answer:

radiation because heat is being transferred

Answer:

It is ultraviolet radiation, which is going to be radiation.

Explanation:

When ultraviolet radiation from the sun reaches the skin, it damages the skin cells and causes mutations in their DNA.

The most likely ion of Aluminum is Al³⁺ (group 3A) since losing three electrons is the most energetically favorable way for it to follow the octet rule.

Because the charge on ions is equivalent to their oxidation state, then +3 is the most likely oxidation number of Aluminum.

Answer:

the protons

Explanation:

the number of protons is constant for each sample of the element. If the number of protons differs, then it is a different element.

The characteristic of an element's atoms that always determines the element's identity is the number of protons. The correct option is C.

A chemical element is a substance that cannot be broken down further through any chemical reaction. Each element's atom contains a distinct number of protons.

A hydrogen atom, for example, has one proton, whereas a carbon atom has six. Ions are created by varying the number of electrons in an element's atom.

The number of protons determines an element's identity. The number of protons cannot be changed without changing the element's identity.

The atomic number increases by one when a proton is added, and the element identity changes.

Color, density, melting point, boiling point, and thermal and electrical conductivity are all properties of elements.

Thus, the correct option is C.

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Your question seems incomplete, the missing options are:

The location of valence electrons.

The number of energy levels.

The number of protons.

The number of neutrons.

A gas, liquid, and solid can all be captured from fossil fuel emissions.

The term fossil fuel refers to the kind of fuel that is obtained from carbonaceous materials. This is the kind of material that serves as a source of energy for automobiles and for heating. It could also be used in the production of electricity.

The burning of fossil fuels leads to the emission of carbon which hurts the environment. Thus, from the passage, we can deduce the a gas, liquid, and solid can all be captured from fossil fuel emissions.

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Answer:

b

Explanation:

When solid converts to gas then heat is required to break the intermolecular forces of attraction between the particles. Therefore, the correct option is option B.

Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.

During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing. the solution can be broken down as Cool liquid from 314 K to 273 K, freeze liquid at 273 K.

Therefore, the correct option is option B.

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What happens to the state of liquid water if enough heat is added?

==============================

Answer:

An object with a high mass close to the Earth could be sent out into a collision course with the asteroid, knocking it off course. When the asteroid is still far from the Earth, a means of deflecting the asteroid is to directly alter its momentum by colliding a spacecraft with the asteroid.

Hope it helps!!

Answer:

1. deflect it 2. grab it with a claw 3. blast it to smithereens

Explanation:

To prepare 0.250 M solution, the 0.0667 mol of KCl should be diluted up to 266.8mL

From the question,

We are to determine to what volume the KCl should be diluted, in order to prepare 0.250 M solution

From the formula,

Numer of  moles = Concentration × Volume

Then, we can write that

\(Volume= \frac{Number\ of\ moles}{Concentration }\)

From the given information,

Number of moles = 0.0667 mole

Concentration = 0.250 M

Then,

\(Volume = \frac{0.0667}{0.250}\)

Volume = 0.2668 L

Volume = 266.8 mL

Hence, to prepare 0.250 M solution, the 0.0667 mol of KCl should be diluted up to 266.8mL

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