Calculate the pH during the titration of 40.00 mL of 0.1000 M HCl with 0.1000 M NaOH solution after the following additions of base:(b) 25.00 mL

• given that volume = 230ml ,therefore mass of water = 230g

• ∆T = Tfinal-Tinitial =30.5-22.9 = 7.6°C

• Specific heat capacity of water , C= 4.184J/°C*g

• Therefore , q = mass* C * ∆T

= 230 * 4.184 * 7.6

=7313.6 J /1000

q= 7.314KJ

• given : mass of methanol burned = Mass F-Mass initial

=(2.51-1.65) = 0.86 g

• So ,moles of methanol , n = mass methanol/Mol. mass methanol

= 0.86g/32.04g/mol

=0.027 moles

• Finally , ∆H = q/n

= 7.314KJ / 0.027mol

=270.85KJ/mol

• However, this is an exorthemic reaction, heat is lost through combustion, our molar enthalpy should be negative.

Answer:

flammability, toxicity, acidity, reactivity, heat of combustion, chemical composition, structure

Explanation:

↦Give 8 properties of chemical compounds.

Hope it helpz!~

#Artemis_Pearl^^

The optimum wavelength for measuring the absorbance versus concentration of a series of Blue 1 dye concentrations is 628nm. The absorbance measurements are most accurate and sensitive for FD&C in the range of 0.2-1.0. Hence the estimated concentration of the dye was 7.0 uM (7.0 x 106 M).

Visible absorption spectra provide information about a dye or a compound's electronic structure and can be used to determine the concentration of a compound. To determine the optimum wavelength for measuring the absorbance versus concentration of a series of Blue 1 dye concentrations, we can refer to the visible absorption spectrum for Blue 1 dye.

The graph provided in the question shows that the maximum absorbance for Blue 1 dye occurs at approximately 628 nm. This is also confirmed by the Beer-Lambert law, which states that the concentration of a solution is proportional to its absorbance. Therefore, the optimum wavelength for measuring the absorbance versus concentration of a series of Blue 1 dye concentrations is 628 nm.

The range of 0.2-1.0 is where the absorbance measurements are most accurate and FD&C sensitive. Therefore, the absorbance measurements for Blue 1 dye should be taken at this wavelength. Hence the estimated concentration of the dye was 7.0 uM (7.0 x 106 M).

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Answer:

C.squeeze itself between layers of rock.

Explanation:

Edge 2021-because

Magma usually stays below the Earth's crust under great pressure. Sometimes, this very hot material can slowly flow into cracks of the crust.

C!

Explanation: skrunkly

Answer:

living part of the environment

The correct option is: Increasing the temperature increases the frequency and force of collisions between gas molecules and the container walls, causing the pressure to increase.

When the temperature of a gas in a closed container is increased, the gas molecules gain kinetic energy and move faster, colliding with the container walls more frequently and with greater force.

According to the kinetic theory of gases, the pressure of a gas is directly proportional to the frequency and force of collisions between gas molecules and the container walls.

Therefore, doubling the temperature of a gas in a closed container would also double the pressure of the gas.

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To calculate the pH of a 0.24 M solution of sodium propionate (NaC2H5CO2), we need to consider the dissociation of propionic acid (HC2H5CO2) and the hydrolysis of sodium propionate.

1. First, let's consider the dissociation of propionic acid:

HC2H5CO2 ⇌ H+ + C2H5CO2-

The equilibrium constant expression for this dissociation can be written as:

Ka = [H+][C2H5CO2-] / [HC2H5CO2]

Given that the pKa of propionic acid is 4.89, we can calculate the value of Ka as:

Ka = 10^(-pKa) = 10^(-4.89)

2. Since we have a 0.24 M solution of sodium propionate, the concentration of propionic acid can be assumed to be the same, as sodium propionate will hydrolyze to form propionic acid and sodium hydroxide:

[HC2H5CO2] = 0.24 M

3. The hydrolysis of sodium propionate can be represented as:

NaC2H5CO2 + H2O ⇌ NaOH + HC2H5CO2

Since sodium hydroxide is a strong base, it will completely dissociate in water, resulting in the formation of Na+ and OH- ions. Therefore, the concentration of NaOH will be equal to the concentration of OH-, which we can assume to be x M.

4. The concentration of HC2H5CO2 can be calculated using the initial concentration and the hydrolysis reaction:

[HC2H5CO2] = 0.24 M - x

5. From the dissociation equation, we know that the concentration of H+ ions will also be x M.

6. To calculate the pH, we can use the equation for the ionization constant (Ka):

Ka = [H+][C2H5CO2-] / [HC2H5CO2]

Substituting the values, we have:

10^(-4.89) = x * x / (0.24 - x)

Solving this equation will give us the value of x, which represents the concentration of H+ ions. Once we have x, we can calculate the pH using the formula:

pH = -log[H+]

However, solving this equation requires numerical methods or approximations, and it cannot be solved analytically. Therefore, I'm unable to provide the exact pH value based on the given information.

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The ratio of the masses of carbon that combine with 1.00 g of oxygen between the two compounds is: 2.46, which we can round to 2.

To find the ratio of the masses of carbon that combine with 1.00 g of oxygen between the two compounds, we need to find the empirical formula for each compound.

First, find the number of moles of carbon in each compound:

Compound 1: 22.0 g C / 12.01 g/mol = 1.83 moles

Compound 2: 34.5 g C / 12.01 g/mol = 2.87 moles

Next, we need to find the ratio of moles of oxygen to moles of carbon for each compound. To do this, we need to find the molecular weight of each compound and divide it by the number of moles of carbon to find the number of moles of oxygen.

Compound 1: 80.5 g / (1.83 moles C) = 43.96 g/mol

Number of moles of O in compound 1: 43.96 g/mol / 16.00 g/mol = 2.75 moles

Compound 2: 80.5 g / (2.87 moles C) = 27.98 g/mol

Number of moles of O in compound 2: 27.98 g/mol / 16.00 g/mol = 1.75 moles

Finally, divide the moles of O in each compound by the moles of C in each compound to find the ratio of moles of O to moles of C:

Compound 1: 2.75 moles O / 1.83 moles C = 1.5

Compound 2: 1.75 moles O / 2.87 moles C = 0.61

So the ratio of the masses of carbon which

combine with 1.00 g of oxygen between the two compounds is:

1.5 / 0.61 = 2.46, which we can round to 2.

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Answer:

D

Explanation:

Answer:

force had thrown the object with more

Answer:

If an object is in motion and more force is applied to it, the object will begin moving faster

Explanation:

don't have any (sorry:[ )

Taking into account the definition of calorimetry, sensible heat and latent heat,  the heat of fusion of water is 335.091 \(\frac{J}{g}\) .

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

In this case:

In firts place, you know that the melting point of water is 0°C. So, first of all you must increase the temperature from -25° C (in solid state) to 0 ° C, in order to supply heat without changing state (sensible heat).

The amount of heat a body receives or transmits is determined by:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing:

Q1= 2.03\(\frac{J}{gC}\) × 49.3 g× 25 °C

Solving:

Q1=2501.975 J=2.501975 kJ≅ 2.50 kJ

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

In this case, you know:

Replacing:

Q2= 49.3 g× ΔHfus

Similar to sensible heat previously calculated, you know:

Replacing:

Q3= 4.18\(\frac{J}{gC}\) × 49.3 g× 44.7 °C

Solving:

Q3= 9211.5078 J=9.2115078 kJ≅ 9.21 kJ

The total heat required is calculated as:

Total heat required= Q1 + Q2 + Q3

Total heat required= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ

Heating a 49.3 g sample of g ice from -25.0 °C to water at 44.7 °C requires 28.23 kJ of heat. This is, the total heat required is 28.23 kJ. Then:

28.23 kJ= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ

Solving:

28.23 kJ= 11.71 kJ + 49.3 g× ΔHfus

28.23 kJ- 11.71 kJ = 49.3 g× ΔHfus

16.52 kJ = 49.3 g× ΔHfus

16.52 kJ ÷ 49.3 g= ΔHfus

0.335091\(\frac{kJ}{g}\)= 335.091 \(\frac{J}{g}\) =ΔHfus

In summary, the heat of fusion of water is 335.091 \(\frac{J}{g}\) .

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The concentration of H+ (hydrogen) ions will increase, and the concentration of OH- (hydroxide) ions will decrease.

To understand why this happens, it's important to know that pH measures the acidity or alkalinity of a substance. A pH value less than 7 indicates acidity, and a pH value greater than 7 indicates alkalinity. A pH of 7 is considered neutral.

In this case, a substance with a pH of 3.2 is acidic. When it is added to water, it releases H+ ions into the solution. These H+ ions increase the concentration of H+ ions in the water, making it more acidic.

On the other hand, the concentration of OH- ions will decrease because the substance with a pH of 3.2 is acidic. Acids have a higher concentration of H+ ions compared to OH- ions. So, when the acidic substance is added to water, the H+ ions will combine with the OH- ions already present in the water, forming water molecules (H2O) and reducing the concentration of OH- ions.

In summary, when a substance with a pH of 3.2 is added to water, the concentration of H+ ions will increase, making the solution more acidic, while the concentration of OH- ions will decrease due to the combination with the H+ ions.

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Answer:

40/18AR

Explanation:

sorry my answer was late but i hope this helps someone else! I got it right on the test

Answer:

40/18 AR

Explanation:

Although TLC is a useful method for monitoring reactions, other observations like color changes, dissolution of solids, gas production, and crystal formation can also provide valuable information about a reaction's completion.

If you forget to monitor a reaction using TLC, there are other observations you can rely on to suggest that the reaction is complete. These observations may include color changes, dissolution of solids, gas production, and crystal formation.

First, a color change in the solution can indicate a reaction's progress. In this case, the solution turning green might signify a reaction completion. Chemical reactions often involve the formation or breakdown of compounds, which can result in a change in the solution's color.

Second, the dissolution of solids in the vial can be another sign. If all solids have dissolved, it could mean that the reactants have reacted completely and formed the desired product(s) in the solution.

Third, monitoring gas production can provide valuable information about the reaction. If you observe no more brown gas being produced, it could suggest that the gas-producing reactants have been used up, and the reaction is complete.

Lastly, crystal formation when the vial is cooled down can be an indication of product formation. Crystals can form when the reaction is complete, and the product(s) precipitate out of the solution as the temperature decreases.

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The concentration of hydrogen ions in the solution of pH 2.0 is 0.01 mol/L

The pH of a solution is a measure of the concentration of hydrogen ions, H+ in the solution.

The relationship between pH and the concentration of hydrogen ions is given by the equation:

pH = -log[H+]

Rearranging the equation gives:

[H+] = 10^(-pH)

Substituting pH = 2.0 into this equation gives:

[H+] = 10^(-2.0)

[H+] = 0.01 mol/L

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Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer:The relationship between acid strength and the pH of a solution. ... Typical concentrations of these ions in solution can be very small, and they also ... Acidic solutions have pH values less than 7, and basic solutions have pH values ... p, O, H, end text, it is a little more common to use pH \text{pH} pHstart text, p, H, end text.

Explanation:Therefore a strong acid will contribute more H+ ions than a weak acid. Therefore, the pH of a strong acid solution will be higher than a weak acid solution.

To determine the amount of zinc that can be collected from a 25g sample of ZnO, you need to calculate the theoretical yield of zinc. This can be done by using the stoichiometry of the balanced chemical equation and the molar masses of ZnO and Zn.

The balanced chemical equation for the reaction between ZnO and an appropriate reducing agent, such as carbon, can be represented as follows:

ZnO + C → Zn + CO

From the equation, we can see that the stoichiometric ratio between ZnO and Zn is 1:1. This means that for every 1 mole of ZnO reacted, 1 mole of Zn is produced.

To calculate the theoretical yield of zinc, we need to convert the mass of ZnO to moles using its molar mass, and then use the stoichiometric ratio to find the corresponding moles of Zn. Finally, we can convert the moles of Zn to grams using the molar mass of Zn.

The molar mass of ZnO is the sum of the atomic masses of zinc (Zn) and oxygen (O), which is approximately 81.38 g/mol. Using the molar mass of Zn (65.38 g/mol), we can now perform the calculation:

Theoretical yield of Zn = (25 g ZnO) × (1 mol ZnO/81.38 g ZnO) × (1 mol Zn/1 mol ZnO) × (65.38 g Zn/1 mol Zn)

Simplifying the calculation, the theoretical yield of Zn from a 25g sample of ZnO is obtained.

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Answer:

Caffeine has no atomic number

Explanation:

Caffeine is a compound, not an element. Therefore it cannot have an atomic number.

Answer:

water cycle

air pressure

Explanation:

Answer:

Should be water cycle, solar radiation, and air pressure!

The major organic product of the reaction between naphthalene and acetyl chloride in the presence of AlCl\(_{3}\) is 1-acetylnaphthalene.

When naphthalene reacts with acetyl chloride (CH\(_{3}\)C(O)Cl) in the presence of aluminum chloride (AlCl\(_{3}\)) as a catalyst, an acylation reaction occurs. The acetyl chloride undergoes acylation, where the acetyl group (CH\(_{3}\)C(O)-) replaces a hydrogen atom in the naphthalene molecule. This results in the formation of 1-acetylnaphthalene, which is the major product of the reaction. The aluminum chloride acts as a Lewis acid catalyst, facilitating the reaction by generating an electrophilic acylium ion (CH\(_{3}\)C(O)+) that reacts with the aromatic ring of naphthalene.

Therefore, the major organic product of the reaction is 1-acetylnaphthalene.

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An electrophoretic separation of lactate dehydrogenase isoenzyme that demonstrates elevation in LD-1 greater than LD-2 could be indicative of Hemolysis.

Hemolysis is a process (generally natural process) associated with the elimination of red blood cells.

Hemolysis can be defined as the removal of erythrocytes due to internal or external environmental factors.

Hemolysis can be discovered by analyzing (or counting) the number of certain proteins in plasma.

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Answer:

Energy of Movement.

Explanation:

Have a great day!

(a) The reduced mass of the muon in muonic hydrogen is 186.88 MeV/c².

(b) The binding energy of a muon in the ground state of muonic hydrogen is 207.6 keV.

(a) The reduced mass of the muon in muonic hydrogen is given by;

μ = (mμmH) / (mμ + mH)

where,

mμ is the mass of the muon and mH is the mass of the proton.

Reduced mass of the muon in muonic hydrogen:

μ = (0.1134 GeV/c² × 1.00783 GeV/c²) / (0.1134 GeV/c² + 1.00783 GeV/c²)

μ = 186.88 MeV/c²

(b) The binding energy, H of muonic hydrogen is given by;

H = (mc² - E)

where,

mc² is the mass of the muonic hydrogen and E is its total energy.

Hydrogen's binding energy is given by:

E = (-13.6 eV) / n²,

where

n is the principal quantum number.

μonic hydrogen's mass, mc² = mμ + mH - E/c²

Binding energy of a muon in the ground state of muonic hydrogen,

H1sH = (mμ + mH - E/c²) - mc²

H1sH = (0.1134 GeV/c² + 1.00783 GeV/c² - 2.24 GeV) - (0.1134 GeV/c² + 1.00783 GeV/c²)

H1sH = 207.6 keV

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Answer:

Nebula or nebulae

Explanation:

Answer:

Nebula or nebulae as it is spelled in the word bank

Explanation:

A nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases.

Upon dissociation of potassium chloride , the potassium ions will interact with the negative end of the water's dipole

As we know , dissociation of potassium chloride results into formation of K+ (potassium ion) and Cl- (chlorine ion ) . the potassium ion has positive charge hence it will attach to the negative part of the water , as opposite charges attracts each other .

The dissociation reaction of potassium chloride is given by ,

KCl + H2O → KOH +HCl

Here the water molecule splits into OH- ion and H+ ion . thus the potassium ion attach to the OH- ion .

potassium chloride is a colorless , odorless , white crystal .the solid dissolves readily in water , its solutions have a salt-like taste .

it is a type of reaction in which the compound splits into its corresponding ions , free radicals and atoms .in this the complex compound dissociate into simple compound .

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The pH of solution is 11. Option b is correct.

The way to measure of how acidic/basic water is pH. The range goes from 0 - 14, with 7 being neutral. pH of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

The full form of pH is “Potential of Hydrogen”. pH is known as the negative logarithm of H+ ion concentration.

pH = -log(H+)

Here, H+ = \(1 \times 10^{-11}\)

pH = \(-\log{10^{-11}}\)

pH = 11

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