student added solid Na2O to a volumetric flask of volume 200.0 mL, which was then filled with water, resulting in 200.0 mL of NaOH solution. Then 5.00 mL of the solution was transferred to another volumetric flask and diluted to 500.0 mL. The pH of the diluted solution is 13.25. (a) What is the molar concentration of hydroxide ions in (i) the diluted solution, (ii) the original solution

Answer:

Explanation: Coefficients and Subscripts There are two types of numbers that appear in chemical equations. There are subscripts, which are part of the chemical formulas of the reactants and products; and there are coefficients that are placed in front of the formulas to indicate how many molecules of that substance is used or produced.

(c) 2AgNO3 + Ni --> Ni(NO3)2 + 2Ag

The work performed on the surroundings by the one-mole ideal gas, which is expanded from 1.00 liter to 3.23 liters against a constant external pressure of 1.00 atm, is -225.51 J.

To calculate the work performed on the surroundings by the ideal gas, we need to use the formula:

W = -PextΔV

where W is the work done on the surroundings, Pext is the external pressure, and ΔV is the change in the volume of the gas.

In this case, we have a one-mole ideal gas that is expanded from 1.00 liter to 3.23 liters against a constant external pressure of 1.00 atm. So, the change in volume is:

ΔV = 3.23 L - 1.00 L = 2.23 L

Since the pressure is constant, we can use the given value of 1.00 atm for Pext. Therefore, the work performed on the surroundings by the ideal gas is:

W = - (1.00 atm) (2.23 L) = -2.23 atm·L

To convert this value to joules, we need to use the following conversion factor:

1 atm·L = 101.325 J

So, the work performed on the surroundings by the ideal gas is:

W = (-2.23 atm·L) (101.325 J/atm·L) = -225.51 J

The negative sign in the answer indicates that the work is performed by the gas on the surroundings, which is consistent with the fact that the gas is expanding.

To learn more about ideal gas

https://brainly.com/question/31463642

#SPJ4

Answer:

The combustion will release -3,321 KJ/mol of energy

Explanation:

What we need to do here is to first calculate the number of moles of methane burnt.

Mathematically, the number of moles of methane burnt = mass of methane/molar mass of methane

Molar mass of methane = 16g /mol

Thus the

number of moles will be ;

59.7/16 = 3.73 moles

Now, 1 mole of methane produces -890 KJ/mol if energy

Then the energy produced by by 3.73 moles of methane would be 3.73 * 890 = -3,320.8125

which is approximately -3,321 KJ/mol

Kindly note that the amount of heat is negative because it is an exothermic reaction

Answer:

Calcium

Explanation:

The number of protons is the atomic number of the element. Number 20 on the periodic table is Calcium.

Answer:

4 sublevels are completely filled.

Explanation:

Magnesium is present in group 2.

Its atomic mass is 24 g/mol.

Its atomic number is 12.

It is alkaline earth metal.

Electronic configuration of Mg:

Ma₁₂ = 1s² 2s² 2p⁶ 3s²

From above given electronic configuration we can see all sublevels are completely filled.

The 1st energy level have one sub level (1s)  which is completely filled, 2nd energy level have 2 sublevel (2s and 2p) and 3rd energy level have one sublevel (3s) completely filled. So all are completely filled.

Answer:

um i think 20

Explanation: because 20

Answer:gear

Explanation:just did it right now

Answer: Gear

Explanation: just did it on Edge 2021

If 0.50 liter of a 2.0 m hcl is diluted with h2o to a volume of 1.0 liter. The molarity of the new solution is 2.0M.

The molarity of the new solution can be calculated by using the following equation:

M1V1 = M2V2, where M1 is the initial molarity, V1 is the initial volume, M2 is the new molarity, and V2 is the new volume. In this case, M1 is 2.0M, V1 is 0.50L, V2 is 1.0L.

Plugging these values into the equation we get:

2.0M x 0.50L = M2 x 1.0L, which simplifies to M2 = 2.0M.

Molarity (M) is a unit of concentration used in chemistry that expresses the number of moles of solute in one liter of solution. Mathematically, it is defined as:

Molarity (M) = moles of solute / liters of solution

For more question on molarity click on

https://brainly.com/question/14469428

#SPJ11

The pH of the buffer solution after adding 5.00 ml of 4.0 mol NaOH (aq) is 1.591.  

To calculate the pH of a buffer solution after adding a strong acid or base, you can use the buffer equation:

pH = pKa - log [A-]/[HA]

where pH is the pH of the solution, pKa is the acid dissociation constant for the weak acid (A-), HA is the conjugate base of the weak acid, and [A-] and [HA] are the concentrations of the weak acid and conjugate base in the solution.

In this case, the weak acid is chloride ion (Cl-), and its pKa is approximately 1.8. The conjugate base of chloride ion is hydrogen chloride (HCl), which is the strong acid being added. The concentrations of the weak acid and conjugate base can be calculated from the initial concentrations of the chloride ion and the hydrogen chloride, as well as the volume of the solution.

The initial concentrations of chloride ion (Cl-) and hydrogen chloride (HCl) can be calculated from the given amounts of the weak acid and the strong acid, and the volume of the solution:

[Cl-] = 0.30 mol / 1.00 L = 0.3 mol/L

[HCl] = 0.30 mol / 1.00 L = 0.3 mol/L

To find the concentration of hydrogen chloride (HCl) after adding the 4.0 mol of NaOH (aq), you can use the equilibrium equation:

[H+][Cl-] = [HCl]

The concentration of hydrogen ions (H+) can be calculated using the equilibrium constant for the reaction between water and hydrogen ions:

[H+] = [H₂O] * K_w

where K_w is the water dissociation constant, which is approximately 1.8 x \(10^-1.\)

[H+] = [H₂O] * 1.8 x 10⁻¹ = 5.4 x 10⁻⁴ M

The concentrations of the hydrogen ion (H+) and the chloride ion (Cl-) can be used to calculate the pH of the solution using the buffer equation:

pH = pKa - log [H+]/[HCl]

where pKa is the acid dissociation constant for the weak acid (chloride ion).

Using these values, you can calculate the pH of the solution:

pH = 1.8 - log [H+]/[HCl]

pH = 1.8 - log (5.4 x 10⁻⁴ M) / (0.3 x 10⁻¹ M)

pH = 1.8 - 0.309

pH = 1.591

Therefore, the pH of the buffer solution after adding 5.00 ml of 4.0 mol NaOH (aq) is 1.591.  

Learn more about buffer solution

https://brainly.com/question/24262133

#SPJ4

Answer: A

Explanation:

The answer is the first option: A

The Milky Way is a spiral galaxy with a black hole in the center named Sagittarius A. The sun is located with the other middle aged stars in the Milky Way galaxy, which means it is placed midway from the center or edge of the galaxy.

By looking at a nuclear reaction, a fission reaction can be easily identified as it shows the breakdown of a larger atom into two or more smaller nuclei.

it is the formation of one or more new nuclides by the collision of two nuclei or external subatomic particles. Nuclear reactions are of two types:

In nuclear fission reaction, a heavier nucleus splits into several smaller lighter nuclei fragments and two or more neutrons. These fragments, or fission products, are either equal to or half of the original mass of the atom The reaction proceeds with a very high emission of energy.

\(238_{92}\)U → \(234_{90}\)Th + \(4_{2}\)\(\alpha\)

To know more about nuclear fission reaction visit:

https://brainly.com/question/913303

#SPJ4

2. The new pressure, given the data is 3.0 atm

3. The new temperature in K is 361 K

4. The new temperature in K is 348 K

The new pressure of the gas can be obtained by using the combined gas equation as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

(3.4 × 1500) / 298 = (P₂ × 2000) / 348

Cross multiply

P₂ × 2000 × 298 = 3.4 × 1500 × 348

Divide both sides by 2000 × 298

P₂ = (3.4 × 1500 × 348) / (2000 × 298)

P₂ = 3.0 atm

The new temperature of the gas can be obtained by using the combined gas equation as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

(167 × 450) / 295 = (230 × 400) / T₂

Cross multiply

T₂ × 167 × 450 = 295 × 230 × 400

Divide both sides by 167 × 450

T₂ = (295 × 230 × 400) / (167 × 450)

T₂ = 361 K

The new temperature of the gas can be obtained by using the combined gas equation as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

(9.2 × 3.6) / 298 = (7.3 × 5.3) / T₂

Cross multiply

T₂ × 9.2 × 3.6 = 298 × 7.3 × 5.3

Divide both sides by 9.2 × 3.6

T₂ = (298 × 7.3 × 5.3) / (9.2 × 3.6)

T₂ = 348 K

Learn more about gas laws:

https://brainly.com/question/6844441

#SPJ1

Motion is the act of shifting one's position.

The physics term for a body's position or orientation changing over time. Translation is the movement along a straight or curved path.. Rotation is a motion that modifies a body's orientation.

According to the information provided,

a body is said to be in motion if its position varies over time. Speed, velocity, distance traveled, displacement, acceleration, and time may all be quantitatively described.

Physics' discipline of kinematics discusses a body's motion without mentioning its cause, while dynamics examines forces as well as how they affect motion.

When it is discovered that an object is not altering its location with respect to a certain frame of reference, it is said to be at rest. Another word for the condition of rest is stationary.

Thus, we could draw the conclusion that motion is the process by which an object's location changes over time.

to know more about Motion visit;

https://brainly.com/question/3421105

#SPJ9

Answer:

c. c. c c c c c cçcc. ccccccccc

Explanation:

ccc cc

When solid converts to gas then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. So option A is correct option.

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. Hence option A is correct.

To learn more about phase transition, here:

https://brainly.com/question/3255181

#SPJ2

Answer:

D. Nuclei with small masses combine to form nuclei with larger masses.

B. A small amount of mass in the nuclei that combine is converted to energy

Explanation:

A nuclear fusion, in contrary to fission, is the process by which the nuclei of two atoms combine to form a much larger atom with a large nuclei. Likewise, during a fusion reaction, a large amount of energy is released from the small amount of mass in the nuclei (two) that combines.

According to this question, the following are true of a fusion reaction:

- Nuclei with small masses combine to form nuclei with larger masses.

- A small amount of mass in the nuclei that combine is converted to enormous energy.

Answer:

four

Explanation:

There is four

CH 4    methane

O2      oxygen

CO2    carbon dioxide

H20    water

Based on the relationship between the number of turns of the coils and the strength of an electromagnet, the true options are:

The hypothesis was supported by the results of the experiment:

The correct option is II only.

The strength of the electromagnet rises with the number of turns in the coil.

This is due to the fact that as the coil "cuts" through the magnetic field, the sum of the individual emf s created by each turn increases with the number of coils turns.

The relative speed between the coil and magnet, as well as the magnet's strength, are additional elements that influence the strength of the induced current in a dynamo in addition to the number of coils. The intensity of the generated current increases with magnet strength and relative speed.

Learn more about electromagnets at: https://brainly.com/question/17231807

#SPJ1

To solve such this we must know the concept of chemical reaction. Therefore, in a chemical change, different  materials are formed that are different from the starting materials.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.

There are so many types of chemical reaction reaction like combination reaction, double displacement reaction. Chemical reaction is a chemical process in which different materials are formed that are different from the starting materials.

Therefore, in a chemical change, different  materials are formed that are different from the starting materials.

Learn more about the chemical reactions, here:

brainly.com/question/3461108

#SPJ1

Answer:

C.Sound waves.

Δ'∘ for the reaction is approximately -1.1 kJ/mol.

Δ for the reaction is approximately -1.69 kJ/mol.

The initial concentrations of reactant and product being 1 M is not consistent with the conditions at which Δ'∘ is measured, as the concentrations used for the calculation are different (1.2 M and 0.65 M).

To determine the values of Δ'∘ and Δ for the given interconversion reaction, we need to use the equation:

Δ'∘ = -RT ln(K'eq)

Where:

Δ'∘ is the standard Gibbs free energy change for the reaction at 25 °C,

R is the gas constant (8.314 J/(mol·K)),

T is the temperature in Kelvin,

ln represents the natural logarithm,

K'eq is the equilibrium constant at the given temperature.

Given that K'eq is 1.97, we can calculate Δ'∘ as follows:

Δ'∘ = -(8.314 J/(mol·K))(298 K) ln(1.97)

Δ'∘ ≈ -1.1 kJ/mol

Therefore, Δ'∘ for the reaction is approximately -1.1 kJ/mol.

To calculate Δ, the Gibbs free energy change under the given conditions with adjusted concentrations, we can use the equation:

Δ = Δ'∘ + RT ln(Q)

Where:

Δ is the Gibbs free energy change,

Δ'∘ is the standard Gibbs free energy change (previously calculated),

R is the gas constant (8.314 J/(mol·K)),

T is the temperature in Kelvin,

ln represents the natural logarithm,

Q is the reaction quotient.

Given the concentrations of fructose 6-phosphate (1.2 M) and glucose 6-phosphate (0.65 M), the reaction quotient (Q) is:

Q = ([glucose 6-phosphate]^n)/([fructose 6-phosphate]^m)

Q = (0.65 M)^1 / (1.2 M)^1

Q ≈ 0.54

Now, we can calculate Δ using the equation:

Δ = -1.1 kJ/mol + (8.314 J/(mol·K))(298 K) ln(0.54)

Δ ≈ -1.1 kJ/mol - 0.59 kJ/mol

Δ ≈ -1.69 kJ/mol

Therefore, Δ for the reaction is approximately -1.69 kJ/mol.

Among the given statements, the ones that are consistent with the conditions at which Δ'∘ is measured are:

The temperature is 273 K.

The pH is 7.

The pressure is 101.3 kPa (1 atm).

The initial concentrations of reactant and product being 1 M is not consistent with the conditions at which Δ'∘ is measured, as the concentrations used for the calculation are different (1.2 M and 0.65 M).

Know more about  initial concentrations   here:

https://brainly.com/question/31259432

#SPJ11

Answer:

135.80 g of Ag

Explanation:

\(40gCu *\frac{1mol Cu}{63.546g Cu} *\frac{2mol Ag}{1molCu} *\frac{107.868g Ag}{1mol Ag}\)

~ 135.80 g of Ag

Answer:

C. Mass extinctions

Explanation:

Mass extinctions happen because of climate change, asteroid impacts, massive volcanic eruptions or a combination of these causes. ... This event seems to be the combination of massive volcanic eruptions (the Deccan Traps) and the fall of a big meteorite.

Answer:

Seattle is shielded from extreme weather by the Cascade and Olympic mountain regions to the east and west, respectively. Low pressure systems tend to come from the south while high pressure systems tend to come from the north.

The modified circuit can no longer boil water because: "The hot plates use electrical energy to generate heat. When a second load is added, electrical energy from the circuit is now shared between two hot plates.Therefore, the correct option is D.

Electrical energy is a form of energy that results from the movement of charged particles, such as electrons. It is the energy that is transferred when an electric current flows through a conductor, and can be converted into other forms of energy, such as heat, light, or mechanical energy.

When a second load is connected, the circuit's electrical power is now split between two hot plates. Because of this, each hot plate uses less electricity and cannot produce as much heat.Therefore, the correct option is D.

Learn more about electrical energy, here:

https://brainly.com/question/1698090

#SPJ1

The question is incomplete, but most probably the complete question is,\

You build a circuit to power a hot plate. The hot plate can quickly heat up and boil a pot full of water. You add a second hot plate to the same circuit. Both plates heat up, but neither plate gets hot enough to boil water. Explain why the modified circuit can no longer boil water. (1 point)

A. The hot plates use electrical energy to generate heat. By adding a second hot plate, you have made an open circuit. This means the path of electricity from the energy source to the hot plates is interrupted.

B. The hot plates use electrical energy to generate heat. If the plates do not generate enough heat to boil water, both loads must be broken.

C. The hot plates use electrical energy to generate heat. If the plates do not generate enough heat to boil water, the energy source of the modified circuit must be broken.

D. The hot plates use electrical energy to generate heat. When a second load is added, electrical energy from the circuit is now shared between two hot plates. This means each hot plate receives less electrical energy and cannot generate as much heat.

Answer:

Ground state means when n = 1

and here the electronic configuration is 2:8:2