If 30.0 ml of 0.20 M ethanol solution reacts with 1.80 g potassium permanganate, what will be the final pH of the solution

Answer:

On number 2.

its c

Answer:

1. A) 2. D) 4. A)

Explanation:

Here is a list of some renewable resources, I hope these help answer the question, or help to answer it.

-ethanol

-hydropower

-geothermal power

-wind energy

-solar energy

-biomass

(Biomass refers to organic material from plants and animals)

Wind, forest, tides and geothermal energy are the resouces of renewable energy.

Renewable resources are energy sources that never run out and can provide a steady supply of clean energy.

Hence resouces of renewable energy are wind, forest, tides and geothermal energy.

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Answer:

a.N

b.Al

Explanation:

nitogen is N in upper case and aluminium is Al.always the second letter is lower case

Recall the heat capacity equation:

q = mc∆T

We're given mass, specific heat capacity, as well as the change in temperature. All we need to do is plug the numbers into the variables and we'll have our answer!

Although this question doesn't try to trick you, more often than not questions regarding energy change will attempt to throw you off with specific heat capacity. It's extremely important to note the units of the specific heat capacity and ensure that the numbers you use are in those units. As an example, the specific heat capacity might be given to you in J/mol*K - in this case, you'd have to do some unit conversions with your given data in order to fit all the numbers. In this question, we're given the specific heat capacity in J/gºC, so we don't need to change anything since all of our data is already in these units.

Anyways, back to the actual question:

q = mc∆T

q = (8.50 * \(10^{2}\)) * (0.900) * (94.6 - 22.8)

q = 54927 (J)

Remeber to include significant figures:

54927 = 5.49 * 10^4 (J)

The required energy is 5.49 * \(10^{4}\) Joules, or 5.49 * \(10^{1}\) kJ

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A reaction is said to have reached equilibrium when the reaction rate is equal in both directions (c).

Like, take the example of copper in copper sulphate solution. When you add Cu to CuSO4 soln., there won't be any change occurring as the reaction rate is equal (Cu is added to CuSO4 soln., there won't be any change as displacement reaction won't take place due to Cu being the same metal as in CuS04 soln...their reaction is the same).

_____

RainbowSalt2222 ☔

The approximate balance in the account at the end of 6 years is $159,074. Rounded to the nearest dollar, it is $159,074.

Assuming that the annual rate of $20,000 is deposited at the beginning of each year, the total amount deposited over 6 years would be $120,000. With continuous compounding at 5% interest rate, the formula to calculate the balance in the account after 6 years is:
A = Pe^(rt)
Where A is the balance, P is the principal (amount deposited), e is the mathematical constant approximately equal to 2.71828, r is the interest rate in decimal form, and t is the time in years.
Plugging in the values, we get:
A = $120,000e^(0.05*6)
A = $159,073.51
Therefore, the approximate balance in the account at the end of 6 years is $159,074. Rounded to the nearest dollar, it is $159,074.

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Answer

1.0 mol

Explanation

Given:

Volume, V = 5.0 L

Temperature, T = 215 K

Pressure, P = 342 kPa

The gas constant, R = 8.31 L kPa/mol K

What to find:

The number of moles of the gas sample.

Step-step-solution:

The number of moles of the gas can be determine using the ideal gas equation formula:

Put the given values into the formula and calculate for n:

The number of moles of the gas sample is 1.0 mol.

The member with the higher entropy in pair A is K(s),

pair B is CuSO45 H2O(s) and pair C is BaCl2(s)

a) The member with the higher entropy is K(s).

This is because K(s) has a larger atomic radius than Na(s), leading to greater disorder and more possible arrangements of atoms/molecules.

(b) The member with the higher entropy is CuSO45 H2O(s). This is because the presence of water molecules allows for more possible arrangements of molecules compared to just CuSO4(s).

(c) The member with the higher entropy is BaCl2(s). This is because BaCl2(s) has more possible arrangements of ions compared to CaF2(s) due to the larger size and charge of the Ba2+ ion.

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Answer:

(a) K(s) has a higher entropy than Na(s) at the same temperature.

(b) CuSO4(s) CuSO4.5H2O(s) has a higher entropy than CuSO4(s) at the same temperature.

(c) BaCl2(s) has a higher entropy than CaF2(s) at the same temperature.

Explanation:

(a)  This leads to a higher entropy for K(s) at the same temperature.

K(s) has a larger atomic radius than Na(s), which means that the number of possible microstates (positions and velocities of individual atoms or molecules) available to the atoms in the solid is higher for K(s).

(b) The hydrated form of CuSO4 has more particles than the anhydrous form, which means that it has a higher entropy at the same temperature.

(c) BaCl2(s) has a more complex crystal structure than CaF2(s), which means that it has a higher entropy at the same temperature.

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No, input energy is not equal to useful output energy, if it is an electric toothbrush.

Electrical Energy is the useful type of energy produced in an electric toothbrush.

If input energy is equal to useful output energy. This means that the total amount of energy that is in an isolated system (such as an engine or a generator) remains constant (conserved) over time.

However, the total amount of useful energy output of an isolated system is never equal to the total energy input.

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γ-ray photons with a wavelength of 2.45x10⁻⁵ nm the energy numerically in kilojoules per mole is 8.118 kJ

Photon is the tiny particles and bundles of electromagnetic radiation

Here given data is

y-ray wavelength = 2.45x10⁻⁵ nm

We have to calculate energy = ?

E = hf

E= Energy of the photon

h= Plank's constant = 6.63×10⁻³⁴

f= frequency of the radiation

But f = c/λ

c= speed of light

λ= wavelength

Hence

E = hc/λ

E = 6.63×10⁻³⁴×3×10⁸/2.45x10⁻⁵

E = 8.118 kJ

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When 156.32 g of barium hydroxide is reacted, approximately 142.34 g of aluminum hydroxide can be produced, based on the balanced chemical equation and stoichiometry.

To determine the amount of aluminum hydroxide that can be produced when 156.32 g of barium hydroxide is reacted, we need to consider the balanced chemical equation for the reaction and use stoichiometry.

The balanced chemical equation for the reaction is:

Ba(OH)2 + 2AlCl3 → 2Al(OH)3 + 3BaCl2

From the balanced equation, we can see that for every 1 mole of Ba(OH)2, 2 moles of Al(OH)3 are produced.

First, we need to calculate the number of moles of barium hydroxide (Ba(OH)2) in 156.32 g:

Molar mass of Ba(OH)2 = (137.33 g/mol + 2(16.00 g/mol + 1.01 g/mol)) = 171.34 g/mol

Moles of Ba(OH)2 = mass / molar mass = 156.32 g / 171.34 g/mol = 0.911 mol

Now, using the stoichiometry of the balanced equation, we can determine the moles of aluminum hydroxide (Al(OH)3) produced:

Moles of Al(OH)3 = 2 × Moles of Ba(OH)2 = 2 × 0.911 mol = 1.822 mol

Finally, to convert the moles of aluminum hydroxide to grams, we need to multiply by the molar mass of Al(OH)3:

Molar mass of Al(OH)3 = (26.98 g/mol + 3(16.00 g/mol + 1.01 g/mol)) = 78.00 g/mol

Mass of Al(OH)3 = Moles of Al(OH)3 × molar mass = 1.822 mol × 78.00 g/mol = 142.34 g

Therefore, when 156.32 g of barium hydroxide is reacted, approximately 142.34 g of aluminum hydroxide can be produced.

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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:

(b) that is hydrophobic

Explanation:

e.g, alanine

Cause, Alanine possess hydrophobic side chain and the most appropriate answer is (d) part......

Alanine is an aliphatic amino acid, because the side-chain connected to the α-carbon atom is a methyl group (-CH3), alanine is the simplest α-amino acid after glycine. The methyl side-chain of alanine is non-reactive and is therefore hardly ever directly involved in protein function..

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Answer:

(b) that is hydrophobic

Explanation:

e.g, alanine

Cause, Alanine possess hydrophobic side chain and the most appropriate answer is (d) part......

Alanine is an aliphatic amino acid, because the side-chain connected to the a-carbon atom is a methyl group (-CH3), alanine is the simplest a-amino acid after glycine. The methyl side-chain of alanine is non-reactive and is therefore hardly ever directly involved in protein function...

Hope it helps....

Explanation:

This is the answer

Calculate the moles of any compound or element and use molar ratio

Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

Answer:

Zn + 2HCl => ZnCl2 + H2

Explanation:

Zn + 2HCl => ZnCl2 + H2

1 Zn +

2 HCl =>

1 ZnCl2 +

1 H2

According to the concept of solubility, the pH of saturated solution of calcium hydroxide is 9.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Significant figures are measure of resolution of a number that are reliable Significant figures include certain digits plus some uncertainty. Therefore, the statement is incorrect.

Just the digits allowed by the measurement resolution are dependable, hence only these can be important figures if a number expressing the outcome of a measurement (such as mass, pressure, length, volume etc.) has more digits than the number of digits allowed by the measurement resolution.

The first three numbers (1, 1 and 4, showing 114 mm) are certain and hence significant figures if, for instance, a length measurement yields 114.8 mm and the smallest distance between markings on the ruler used in the measurement is 1 mm.

Significant figures also include uncertain but dependable digits. Even though there are other significant figures in this case, the final digit (8, which adds 0.8 mm), is also seen as significant. Therefore, the statement is false.

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Answer:

Energy is absorbed because the product has more energy than the reactants have.

Explanation:

its A

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When the cold balloon filled with 2.30 L of helium is brought into the salt-conditioned car, the balloon is likely to shrink or decrease in size.

The volume of a gas is directly affected by temperature. When the cold balloon filled with helium is brought into a salt-conditioned car, the temperature inside the car is likely to be lower than the temperature outside. As a result, the temperature of the helium gas inside the balloon will decrease. According to Charles's Law, the volume of a gas decreases with a decrease in temperature, assuming constant pressure. Therefore, the helium gas inside the balloon will contract, causing the balloon to shrink or decrease in size.

Thus, the balloon will shrink or decrease in size when brought into the salt-conditioned car.

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Answer:Ag

Explanation:

Erosion and weathering convert boulders and mountains into sediments, such as sand or mud.This method uses slightly acidic water to gradually wear away stone.

The term erosion is defined as when small pieces of the Earth's surface are moved from one place to another. Boulders and mountains become sediments, such as sand or mud, as a result of erosion and weathering.

Chemical weathering, or dissolution, is one type of weathering.The starting materials for new, sedimentary rocks are produced by these three processes.

Thus, Erosion and weathering convert boulders and mountains into sediments, such as sand or mud.

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We need to add 2.73 mL of the concentrated acid to obtain a total volume of 175 mL of the dilute solution.

Molarity is defined as the number of moles of solute per liter of solution. A solution that contains one mole of solute per liter of solution is said to be 1 molar (1 M).

We wish to make a 0.186 M nitric acid solution from a stock solution of 12.0 M nitric acid and we want to obtain a total volume of 175 mL of the dilute solution, the amount of concentrated acid we need to add can be determined using the formula shown below: M1V1 = M2V2 where:

M1 is the initial molarity (concentration) of the concentrated acid (12.0 M)

V1 is the initial volume of the concentrated acid (unknown)

M2 is the final molarity (concentration) of the dilute solution (0.186 M)

V2 is the final volume of the dilute solution (175 mL)

Rearranging the formula above, we get: V1 = (M2V2) / M1

Substituting the values given: M1 = 12.0 MM2 = 0.186 MV2 = 175 mL= 0.175 L

Therefore: V1 = (0.186 M x 0.175 L) / 12.0 M= 0.00273 L = 2.73 mL (to two decimal places)

Hence, we need to add 2.73 mL of the concentrated acid to obtain a total volume of 175 mL of the dilute solution.

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Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

i. Ionic bond: bond between an anion and a cation. ii. Polar covalent: bond between atoms of the same element but different electronegativities. iii. Non-polar covalent: weak intramolecular bond. iv. Hydrogen: bond between the hydrogen atom in one molecule and a more electronegative atom in another molecule

Based on their properties, chemical bonds are classified into four major types. These include Ionic bonds, covalent bonds, polar covalent bonds, and hydrogen bonds. Some characteristics of the four types of chemical bonds are as follows:

i. Ionic bond: An ionic bond is formed when electrons are transferred from one atom to another atom. The resulting ions are attracted to each other and form an ionic bond. Ionic bonds are typically between metals and nonmetals.

ii. Polar covalent bond: Polar covalent bonds occur when atoms of the same element but different electronegativities bond. The atoms share the electrons unequally in a polar covalent bond, creating a partial positive charge on the less electronegative atom and a partial negative charge on the more electronegative atom. Polar covalent bonds typically occur between nonmetals.

iii. Non-polar covalent bond: Non-polar covalent bonds occur between two atoms of the same element or between different elements with the same electronegativity. The sharing of electrons between the atoms in a nonpolar covalent bond is equal. As a result, there is no net charge distribution across the molecule, and the bond is nonpolar. Nonpolar covalent bonds typically occur between nonmetals.

iv. Hydrogen bond: Hydrogen bonds are weak intramolecular bonds that occur between the hydrogen atom in one molecule and a more electronegative atom in another molecule. Hydrogen bonds are important in the secondary and tertiary structures of proteins and the structure of water.

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When a metal is exposed to photons at a frequency of 1.05 × 1015 s−1, electrons are emitted with a maximum kinetic energy of 3.80 × 10−19 J.

The experiment implies that when photons with a frequency greater than the threshold frequency fall on the surface of a metal, electrons are emitted from it. If the frequency is less than the threshold frequency, no electrons will be emitted regardless of the intensity of the light. If the frequency of the light is equal to or greater than the threshold frequency, the number of emitted electrons increases with the increase in light intensity.

The maximum kinetic energy of emitted electrons increases linearly with the frequency of the incident radiation. The maximum kinetic energy, Kmax is given by Einstein's photoelectric equation: Kmax = hf − φWhere h is Planck's constant (6.626 × 10−34 J s), f is the frequency of the light, and φ is the work function of the metal. The work function (φ) of a metal is the minimum energy required to remove the most loosely bound electron (electron in the outermost shell) from the metal surface.

So, the above information can be concluded as the photoelectric effect refers to the emission of electrons from a metal surface when light of sufficient frequency falls on it. It was discovered by Hertz and explained by Einstein.

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The pressure of the gas using the ideal gas equation and by using the van der Waals equation is 2.52 atm and 0.164 atm.

Ideal gas equation is defined as the state equation for a fictitious perfect gas. Although it has significant drawbacks, it is a decent approximation of the behavior of many gases under various conditions.

Given n = 3.21 moles

V = 5.22 L

T = 50 °C

R = 0.0821 L atm K-1 mol-1

a = 4.17 atm L2 mol-2

b = 0.0371 L mol-1

Ideal gas equation

PV = nRT

P = nRT / V

P = 3.21 x 0.0821 x 50.0 / 5.22

P = 2.52 atm

Van der Waals equation

P = RT / V - b - a / V²

P = 0.0821 x 50.0 / 5.22 - 0.0371 - 4.17 / ( 5.22 )²

P = 0.317 - 0.153

P = 0.164 atm

Thus, the pressure of the gas using the ideal gas equation and by using the van der Waals equation is 2.52 atm and 0.164 atm.

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The moles of kmno4 are present in 345 ml of 1.22 m kmno4 solution are 0.421 moles.

To calculate the moles of KMnO4 present in 345 mL of a 1.22 M KMnO4 solution, you can follow these steps:
1. Convert the volume of the solution from milliliters (mL) to liters (L): 345 mL * (1 L / 1000 mL) = 0.345 L
2. Use the molarity formula: moles of solute = molarity (M) * volume of solution (L)
3. Plug in the values: moles of KMnO4 = 1.22 M * 0.345 L
4. Calculate the moles of KMnO4: 1.22 * 0.345 = 0.4209

To three significant figures, there are 0.421 moles of KMnO4 present in 345 mL of a 1.22 M KMnO4 solution.

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