a buffer that contains 1.10 m base, b, and 0.800 m of its conjugate acid, bh , has a ph of 9.100. what is the ph after 0.0055 mol of hcl is added to 0.500 l of this solution?

hi <3

isotopes have the same number of protons but different numbers of neutrons, and thus a different mass number.

chlorine has isotopes and so does hydrogen

hope this helps :)

Isotopes are atoms of same element having same atomic number but different mass numbers.

i.e because of different number of neutrons.

Example 1 : isotopes of Hydrogen

Example 2 : isotopes of Carbon

I hope it helped...

To buy two chocolate bars, one pack of peanuts, and a can of soda with a snack machine that only accepts 5-centavo coins, we need to Solve the Equation to calculate the total cost and the number of coins required. The answer to this question is 21 coins.

One chocolate bar costs 25 cent, so two chocolate bars cost 25 x 2 = 50 cent.One pack of peanuts costs 75 cent.A can of soda costs 50 cent.The total cost of these snacks is 50 + 75 + 50 = 175 cent.Now, we need to find how many 5-centavo coins make up 175 cent.1 centavo is equal to 0.05 cents.Therefore, 175 cent is equal to 175/0.05 = 3,500 centavos.

To find the number of 5-centavo coins required, we need to divide 3,500 by 5.3,500 ÷ 5 = 700 coins.So, it will take 700 5-centavo coins to buy two chocolate bars, one pack of peanuts, and a can of soda.

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Answer:

The pool float looked would have looked deflated the next morning.

Explanation:

When temperature decreases the volume decreases

Answer:

The pool float most likely looked a little deflated or pushed in

Explanation:

The pool float most likely looked a little deflated or pushed in. This is because during the night temperatures most likely dropped. These cold temperatures during the night would have caused the air molecules inside the pool float to come closer together which would cause there to be more excess space inside the pool float. Therefore, allowing it to collapse into itself. This would be far worse if the float was filled with helium or another gas other than O2.

Benzene will undergo an electrophilic aromatic substitution reaction more rapidly than hexadeuteriobenzene.

Hexadeuteriobenzene will undergo an electrophilic aromatic substitution reaction more slowly than benzene. This is because the deuterium atoms, being heavier than hydrogen atoms, reduce the rate of reaction due to their higher zero-point energy. The deuterium atoms also reduce the reactivity of the ring because they decrease the electron density of the aromatic system, making it less likely to react with electrophiles. Therefore, benzene, which lacks deuterium atoms, is expected to undergo an electrophilic aromatic substitution reaction more rapidly than hexadeuteriobenzene.

This is due to the kinetic isotope effect, where the presence of deuterium atoms in hexadeuteriobenzene leads to a slower reaction rate compared to benzene, which has hydrogen atoms. The heavier mass of deuterium results in a stronger carbon-deuterium bond, making it more difficult for electrophiles to break the bond and substitute the deuterium during the reaction.

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A pool fire is the most common type of fire that can occur from atmospheric pressure storage tanks storing flammable liquids. To prevent fires, it is important to follow safety standards and handle the flammable liquid carefully. This will help ensure the safety of workers, the public, and the environment.

Flammable liquids are substances that can ignite and burn easily. They are commonly used in industrial processes and transportation, and are often stored in atmospheric pressure storage tanks. These tanks are designed to maintain the liquid at a constant pressure and temperature, but they can also pose a fire hazard if not handled properly.

There are different types of fires that can occur from atmospheric pressure storage tanks storing flammable liquids, depending on the specific characteristics of the liquid and the tank. However, the most common type of fire is a pool fire, which occurs when a flammable liquid spills and forms a pool on the ground or a surface.

Pool fires can be very dangerous because they can spread quickly and generate intense heat and flames. The heat from the fire can cause the tank to rupture, which can release more flammable liquid and make the fire even worse. In addition, pool fires can produce toxic fumes and smoke, which can be harmful to human health and the environment.

To prevent fires from atmospheric pressure storage tanks, it is important to store the flammable liquid in tanks that are designed and maintained according to safety standards. This includes ensuring that the tank is properly grounded to prevent static electricity, and that it is equipped with safety features such as pressure relief valves and flame arrestors. It is also important to handle the flammable liquid carefully, and to train workers on the proper procedures for handling, storing, and transporting it.

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Answer:

It is a force of attraction that holds the atoms/ions with each other to form a molecule or between the molecules to form a substance.

Explanation:

The chemical bond can be thought of as a force that holds the atoms of various elements together in such compounds.

Answer: In the given reaction:

Cl⁻ + H₃O⁺ ⇋ H₂O⁻ + HCl

Acid: H₃O⁺ (hydronium ion)

Base: Cl⁻ (chloride ion)

Conjugate acid: H₂O⁻ (hydroxide ion)

Conjugate base: HCl (hydrochloric acid)

In this reaction, H₃O⁺ acts as an acid because it donates a proton (H⁺ ion) to Cl⁻, which acts as a base. After the proton transfer, H₃O⁺ becomes its conjugate base, H₂O⁻, and Cl⁻ becomes its conjugate acid, HCl.

The rules of conservation of mass and ensuring that the number of atoms is the same for each element on both sides, we arrive at the balanced equations shown above for each reaction.

Balanced equations for the given reactions are as follows:

NH4NO2 → N2 + 2 H2O

Fe3O4 + 8 Al → 4 Al2O3 + 3 Fe

C10H20 + 13 O2 → 10 CO2 + 10 H2O

2 H3PO4 + 3 Mg(OH)2 → Mg3(PO4)2 + 6 H2O

4 Na + O2 → 2 Na2O

To balance these equations, you need to ensure that the number of atoms of each element is the same on both sides of the equation. Coefficients are placed in front of the reactants and products to achieve this balance. It's important to note that subscripts within the chemical formulas should not be changed to balance the equations.

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The percent by mass of sodium sulfide in the solution is approximately 25.7%.

To calculate this, we use the equation: mass of solute / mass of solution x 100.

First, we need to calculate the mass of the sodium sulfide in the solution.

Since the concentration of the solution is given as 0.326 molal, we can calculate the mass using the following equation: mass = molal x molar mass.

The molar mass of sodium sulfide is 119.06 g/mol, so the mass of the sodium sulfide in the solution is 38.90 g.

Next, we need to calculate the total mass of the solution.

Since we are dealing with an aqueous solution, the mass of the water can be assumed to be the total mass of the solution.

The density of water is 1 g/mL, so we can calculate the total mass of the solution by multiplying the volume of the solution by the density.

Finally, we can use the equation: mass of solute / mass of solution x 100 to calculate the percent by mass of sodium sulfide in the solution. The result is approximately 25.7%.

In summary, the percent by mass of sodium sulfide in the solution is approximately 25.7%. This value was determined by calculating the mass of the sodium sulfide in the solution, the mass of the solution, and using the equation: mass of solute / mass of solution x 100.

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As per the given statements : 1. Particle A is an atom because it has protons, electrons and neutrons.2. A, B and C are all particles of the same element. No, A, B and C are not the particles of same element as there no. of electrons differ. 3.Particles A and C are isotopes of the same element. Yes.

The smallest unit of matter in which it can be broken without exhibiting any charged particle is termed as atom. atom is made up of three particles of which Proton (+ivly charged) and electron (-ivly charged) are charged particles while neutron is a neutral particle , doesn't have any charge.

They are the particles of same element and have same no . of protons and electrons i.e. is same atomic number but they differ in no. of neutrons.

So bcz of the above reason in statement three Particles A and C are isotopes of the same element is correct.

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The color of stool can be an indicator of various health conditions, dietary habits, and medication use. The normal color of stool varies from light to dark brown, depending on the amount of bile pigment present in the stool. Following ingestion of carrots or beets, the nurse would expect a temporary alteration in stool color to a reddish or orange tint due to the pigments present in these vegetables.

This change in stool color is harmless and usually lasts for a day or two until the pigments are fully digested and eliminated from the body. It is important to note that any persistent or unexplained changes in stool color should be reported to a healthcare provider for further evaluation.

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Electron and proton attract each other.

Two electrons will repel each other.

An electron is a negatively charged subatomic particle that can be either sure to an atom or free (no longer certain). An electron this is certain to an atom is one of the three primary varieties of particles inside the atom -- the other  are protons and neutrons. collectively, electrons, protons and neutrons shape an atom's nucleus.

A proton is a subatomic particle observed inside the nucleus of each atom. The particle has a positive electric price, same and opposite to that of the electron. If remoted, a single proton could have a mass of best 1.673 ? 10-27 kilogram, simply barely much less than the mass of a neutron.

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Explanation:

No of moles = mass/ molar mass

MgCl2 = 24+35.5*2

= 24+70

= 94 gmol—1

No of moles = 1.25/94

= 0.013 moles

One mole of magnesium chloride weighs 95.21 grams. Therefore, the number of moles in  1.25 grams of the compound is 0.0131 moles.

Magnesium chloride is an ionic compound formed by the electron transfer from magnesium metal to the chlorine atoms.

To determine the number of moles of MgCl₂ in 1.25 grams, we need to use the formula:

moles = mass / molar mass

The molar mass of MgCl₂ can be calculated by adding up the atomic masses of its constituent atoms, which are:

Mg: 24.31 g/mol

Cl: 35.45 g/mol (x2, since there are two Cl atoms in MgCl2)

So, the molar mass of MgCl₂ is:

MgCl₂: 24.31 g/mol + 35.45 g/mol x 2 = 95.21 g/mol

Now we can use the formula to calculate the number of moles:

moles = mass / molar mass = 1.25 g / 95.21 g/mol

moles = 0.0131 mol (rounded to four significant figures)

Therefore, there are approximately 0.0131 moles of MgCl₂ in 1.25 grams.

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Answer:

The major potential environmental impacts associated with mining and associated mineral processing operations are related to erosion-prone landscapes, soil and water quality, and air quality.

Explanation:

Plants were native to the mining site and making sure the soil is healthy are the examples of environmental concerns taking into account by a mining company when it created a reclamation plan for a mine site.

Land use may change as a result of mine exploration, construction, operation, and maintenance.

It may also have detrimental effects on the environment, such as deforestation, erosion, contamination of nearby streams and wetlands, alteration of soil profiles, increased noise levels, and dust.

Mining is a naturally invasive operation that can alter the landscape over a much wider region than the actual mining site.

Therefore, years after a mine closes, the impacts of this harm can still be felt, adding to greenhouse gas emissions, causing flora and fauna to die, and eroding the land and environment.

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1 . 3 3 7 5 × 1 0 2 3 f o r m u l a u n i t s

One percent  of a human's DNA is used for coding Information for the synthesis of proteins.

DNA  is a hereditary material which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus  and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.

DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule  and a phosphate group. A base, phosphate  sugar are together called as nucleotides.

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Your question is incomplete, but most probably your full question was,approximately what percentage of a human's DNA is used for coding Information for the synthesis of proteins?

5%

25%

99%

95%

1%

Answer: force velocity

Explanation:

Answer:

12 and 20 moles ratios, respectively.

Explanation:

Note that the number of mole ratios you can write for a chemical reaction involving a total of n substances is (n)(n–1). Thus, for reactions involving four and five substances, you can write 12 and 20 moles ratios, respectively.

*** HOPE IT HELPS! :)

Answer:

3: 1 CH4+ 2 O2-> 1 CO2 + 2 H2O

4: 2 K+ 2 H2O -> 2 KOH+ 1 H2

Explanation:

Answer:

This question is incomplete

Explanation:

This question is incomplete. However, the beaker that contained some water before NaOH were added means that the resulting solution in that beaker will be more dilute. When this diluted sodium hydroxide solution is added to HCl (not hci), the reaction below occurs

HCl + NaOH ⇒ NaCl + H₂O

The reaction above is a neutralization reaction. The concentration of the acid (HCl) will reduce when a base (sodium hydroxide) is added and will also reduce more because of the presence of more water (in the base) which normally reduces the concentration of ions present in an acid or a base to become more dilute.

1. X is ethanol - CH3CH2OH. Y is Sodium ethoxide  - CH3CH2ONa. Chemical equation for the reaction is: 2CH3CH2OH+2Na→2CH3CH2ONa+H2. When Ethanol is heated with excess of conc. sulphuric acid, it leads to dehydration of ethanol to ethene - CH2=CH2. CH3CH2OHconc.H2SO4CH2=CH2+H2O

Fuel gas is any of a variety of fuels that are gaseous under normal circumstances. The majority of fuel gases are made up of hydrocarbons, hydrogen, carbon monoxide, or a combination of these. These gases are energy sources that can be easily carried and disseminated via pipelines. A combustible gas is one that may burn in either air or oxygen. Combustible gases include hydrogen, methane, propane, and isobutane. In the presence of an ignition source, a mixture of flammable gas and oxygen will explode. Combustible gas is a common cause of gas explosions.

Here,

If a small piece of sodium is dropped into ethanol, it reacts steadily to give off bubbles of hydrogen gas and leaves a colorless solution of sodium ethoxide CH3CH2ONa. Hydrogen gas that is released burns with a pop sound.

1. X is ethanol - CH3CH2OH

2. Y is Sodium ethoxide  - CH3CH2ONa

3. Chemical equation for the reaction is:

     2CH3CH2OH+2Na→2CH3CH2ONa+H2

4. When Ethanol is heated with excess of conc. sulphuric acid, it leads to dehydration of ethanol to ethene - CH2=CH2.

    CH3CH2OHconc.H2SO4CH2=CH2+H2O

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Answer:

Probably B?

Explanation:

I don't have one...

Hope it helps I guess..

Answer: i think is B

Explanation: HATE ME IF IM WRONG

Answer:

higher than 59 c because dipole- dipole interactions in iodine monocholoride are stronger than dispersion forces in bromine

The boiling point is the temperature at which the pressure of the liquid is equal to the vapor pressure. The b.p of iodine monochloride will be higher than 59 °C because dipole-dipole interactions are stronger. Thus, option C is correct.

A dipole-dipole interaction is the type of electrostatic attractive force that exists between the positive and the negative side of the polar molecule. They are strong interactions between polar molecules.

The Iodine monochloride (ICl) has a higher boiling point as compared to bromine as the former is a polar molecule with a dipole-dipole bond. The bromine shows the dispersion forces that are the weakest forces.

The polar molecules have differences in their electronegativities that make them have strong dipole interactions. As a result, will need higher temperatures to break bonds.

Therefore, option C. ICl will need a higher boiling temperature than bromine due to the presence of strong dipole forces.

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The given reaction is the calcium carbide reaction of calcium hydroxide with water to produce acetylene.

The balanced equation is CaC2+2H2OCa(OH)2+C2H2.

Molar mass of acetylene, C2H2 = 2x12+2x1 = 26 g/mol

we get 64 g of CaC2 becomes 26 g of C2H2. 5.0g CaC2..

Molecular weight of Ca(OH)2=1(atomic weight of Ca)+2(atomic weight of O)+2(atomic weight of H)=40+2(16)+2(1)=40+32+2=74.

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Answer: 1

Explanation:

Answer:

4NaHCO3---->2Na2CO3+2CO2+2H2O

Explanation:

3,11 g   *  7.9 C  * .130  J/(g C)  = 3.19 J

See how the   'g'   the 'C' cancel out and you are left with  'J ' for an answer?

Answer:

The correct answer is 1.66 atm ≅ 1.7 atm

Explanation:

Given:

T₁ = -13°C + 273 = 260 K (initial temperature)

T₂ = 15°C + 273 = 288 K (final temperature)

P₁ = 1.5 atm

P₂= ?

We use the mathematical expression of Gay Lussac's Law to calculate P₂, as follows:

P₁/T₁ = P₂/T₂

P₂= P₁/T₁ x T₂ = (1.5 atm)/(260 K) x 288 K = 1.66 atm ≅ 1.7 atm

Since the law says that the temperature of a gas is directly proportional to the pressure, when the temperature is increased, the pressure increases.