20 CCC Proportion What are the top three sources of U.S. electricity
generation? Estimate the overall efficiency of U.S. electricity
generation. How does this compare to the efficiency for
transportation?

The compound:

Can be called as Tungsten (V) hydroxide.

Answer:

Find the molar mass of each individual element, multiply that molar mass number by the element's subscript in the formula, and then add together.

Explanation:

The endpoint coordinates of the mid-segment of triangle JKL is (5.06, 4.04).

Given the triangle JKL in which mid-segment of triangle JKL is parallel to JL.

Now we need to find the endpoint coordinates of the mid-segment of triangle JKL.

Hence the midpoint of JK = M (3, 2.5) and the length of \(JK = JL/2= \sqrt{((5 - 1)^{2} + (4 - 1)^{2} )} / 2 = 4.12/2 = 2.06\)

Now we know the length of mid-segment JK = 2.06 and its midpoint, we can find the endpoint coordinates by using the slope formula

Endpoint of JK, K is(1, 3)

hence the coordinates are \((3 + 2.06, 2.5 + 1.54) = (5.06, 4.04)\)

Therefore, the endpoint coordinates of the mid-segment of triangle JKL is (5.06, 4.04).

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The molar concentration of the resulting NaCl solution is 0.538 M when 294 mL of 0.800 M and 627 mL of 0.460 M NaCl solutions are mixed.

We are given two arrangements with various centralizations of NaCl and volumes. We want to figure out the grouping of NaCl in the last arrangement when the two arrangements are blended.

To do this, we can utilize the equation:

\(C_{1} V_{1} + C_{2} V_{2} = C_{3} V_{3}\)

where \(C_{1}\) and \(V_{1}\) are the focus and volume of the main arrangement, \(C_{2}\) and \(V_{2}\) are the fixation and volume of the subsequent arrangement, and \(C_{3}\) and \(V_{3}\) are the focus and volume of the last arrangement.

Subbing the qualities given in the issue, we get:

(0.800 M) * (294 mL) + (0.460 M) * (627 mL) = C3 * (294 mL + 627 mL)

Working on this situation, we get:

(0.800 M * 294 mL) + (0.460 M * 627 mL) = C3 * 921 mL

Presently, we can address for C3 by separating the two sides of the situation by 921 mL:

C3 = [(0.800 M * 294 mL) + (0.460 M * 627 mL)]/921 mL

C3 = 0.538 M

Hence, the last grouping of NaCl in the blended arrangement is 0.538 M.This intends that if we somehow happened to allot a specific volume of the blended arrangement, how much NaCl present in that volume would be equivalent to that of a 0.538 M NaCl arrangement.

It's essential to take note of that when two arrangements are blended, the subsequent focus isn't just the normal of the two fixations. Rather, it relies upon how much every arrangement added and their individual fixations.

In this issue, we can see that the last convergence of NaCl is nearer to the centralization of the more weaken arrangement (0.460 M) than to the grouping of the more thought arrangement (0.800 M).

This is on the grounds that the bigger volume of the less focused arrangement weakens the more thought answer for a more prominent degree, bringing about a last fixation that is nearer to the less focused arrangement.

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Answer:

hydrogen gas

The reaction of sodium and water produces hydrogen gas and heat, which is not a good combination! Sodium must be stored under mineral oil, or some other high-molecular weight hydrocarbon. Chlorine gas is toxic, and extremely irritating to the eyes and mucous membranes.✨

Explanation:

It is from a website.

Have a great time studying

Answer:

B₃H₄

Explanation:

This is a covalent compound, therefore we use the prefixes in front of the words to know how many of each atom there are. Triboron means there are 3 boron atoms. Tetra means four, and hydride is just the suffix form of hydrogen. So there are 3 boron atoms and 4 hydrogen atoms to make B₃H₄

They give us the mass of H2O, to determine the moles we will use the molar mass of H2O equal to 18g/mol

a. The number of moles of H2O is 2.78

Now, the number of molecules is found using Avogadro's relation, which tells us that in one mole of any substance, there will be 6.022x10^23 molecules. So the molecules of H2O will be:

b. There are 1.67x10^24 molecules in 50 grams of H2O

The [H⁺] concentration, [OH⁻] concentration, pH, and pOH of a 7.5 x 10⁻² M H₂SO₄ solution are as follows:

[H⁺] = 7.5 x 10⁻² M, [OH⁻] = 1.33 x 10⁻¹³ M, pH = 1.12, pOH = 12.88.

H₂SO₄ is a strong acid that completely ionizes in water, producing H⁺ ions and sulfate ions (SO₄²⁻). The concentration of H⁺ ions in the solution is equal to the molar concentration of H₂SO₄, which is 7.5 x 10⁻² M.

Since H₂SO₄ is an acid, it donates H⁺ ions to the solution, and as a result, the concentration of OH⁻ ions is very low. In this case, it can be calculated using the relationship [H⁺] × [OH⁻] = 1 x 10⁻¹⁴ M² (for water at 25°C). Rearranging this equation, we find [OH⁻] = 1 x 10⁻¹⁴ M² / [H⁺] = 1.33 x 10⁻¹³ M.

The pH of a solution can be calculated using the equation pH = -log[H⁺]. Plugging in the value of [H⁺], we get pH = -log(7.5 x 10⁻²) = 1.12.

Similarly, the pOH of a solution can be calculated using the equation pOH = -log[OH⁻]. Plugging in the value of [OH⁻], we get pOH = -log(1.33 x 10⁻¹³) = 12.88.

In summary, the H⁺ concentration is 7.5 x 10⁻² M, the OH⁻ concentration is 1.33 x 10⁻¹³ M, the pH is 1.12, and the pOH is 12.88 for the 7.5 x 10⁻² M H₂SO₄ solution.

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Answer:

B

Explanation:

electron.elements of the same group have the same electrons

3 moles or 84.03 g of CO produces 3 moles of or 132 g of CO₂. Thus, the mass of CO required to produce 635 g of CO₂ is 404.23 g.

Carbon monoxide  is an inorganic gas produced from the covalent bonding  of carbon with oxygen. When carbon monoxide reacts with metal oxides it produces carbon dioxide.

From the given balanced reaction, 3 moles of CO produces 3 moles of CO₂.

Molar mass of CO = 28.01 g/mol, 3 moles =  (28.01 ×3) 84.03 g

molar mass of CO₂ = 44.01 g/mol , 3 moles = 132 g.

Thus, mass of CO required to produce 635 g of CO₂ is :

= (84.03 × 635 g) /132 g = 404.23 g.

Therefore, the mass of CO required to produce 635 g of CO₂ is 404.23 g.

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Answer:

The proportionality constant ( Henry’s constant) = 2.32 * 10^-5 M/kPa

Explanation:

Here in this question, we are concerned with calculating the proportionality constant for this gas.

Mathematically, we can get this from Henry law

From Henry law;

Concentration = Henry constant * partial pressure

Thus Henry constant = concentration/partial pressure

Henry constant = 0.00290 M/125 kPa = 2.32 * 10^-5 M/kPa

The characteristics and the type of molecular bond they describe:

1. Bonds found in Halite (between Na⁺ and Cl⁻): Ionic bond

2. Bonds found between Si and O in the Si-O tetrahedron: Covalent bond

3. Bonds inside the water molecule (between the H and O): Covalent bond

4. Bonds that exist between two water molecules: Hydrogen bond

5. Strongest bond type: Covalent bond

6. Weakest bond type: Van der Waals bond

7. Bonds that are used by water to dissolve salt: Ionic bond

The ionic bond is a type of molecular bond found in halite (between Na⁺ and Cl⁻). The Si-O tetrahedron is held together by a covalent bond. The bond inside the water molecule (between the H and O) is also a covalent bond. The hydrogen bond is the type of bond that exists between two water molecules. The covalent bond is the strongest bond type, while the van der Waals bond is the weakest bond type. Water uses the ionic bond to dissolve the salt.

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The equation for the reaction that goes with Ka1 for oxalic acid (H2C2O4) is:

H2C2O4 + H3O+ ⇌ HC2O4- + H2O

The equation for the reaction that goes with Ka2 for oxalic acid (H2C2O4) is:

HC2O4- + H3O+ ⇌ C2O4 2- + H2O

The equations given are related to the acid dissociation of oxalic acid (H2C2O4), which is a weak diprotic acid. The first equation represents the dissociation of the first proton (H+) from the acid, which has a dissociation constant Ka1 of 5.90×10^-2. The equation is:

H2C2O4(aq) + H2O(l) ⇌ H3O+(aq) + HC2O4-(aq)

In this equation, the acid (H2C2O4) reacts with water (H2O) to form hydronium ions (H3O+) and hydrogen oxalate ions (HC2O4-).

The second equation represents the dissociation of the second proton from the acid, which has a dissociation constant Ka2 of 6.40×10^-5. The equation is:

HC2O4-(aq) + H2O(l) ⇌ H3O+(aq) + C2O4^2-(aq)

In this equation, the hydrogen oxalate ion (HC2O4-) reacts with water (H2O) to form hydronium ions (H3O+) and oxalate ions (C2O4^2-).

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To differentiate between an alkane and an alkene, you can use a simple chemical test called the bromine test.

Here's how it works:

Obtain a small amount of the compound you want to test. Make sure you handle it safely in a well-ventilated area.

Add a few drops of a bromine solution (usually a solution of bromine in an organic solvent like tetrachloromethane) to the compound.

Observe the color change. Alkanes are saturated hydrocarbons and do not react with bromine. Therefore, if the compound remains orange/brown, it indicates that it is an alkane. On the other hand, alkenes are unsaturated hydrocarbons and readily react with bromine.

If the compound is an alkene, you will see the orange/brown color of bromine disappear rapidly as the alkene undergoes an addition reaction with bromine. The solution turns colorless or a lighter shade, indicating the presence of an alkene.

By performing the bromine test, you can differentiate between alkanes and alkenes based on their reactivity with bromine. Alkanes do not react, while alkenes undergo a noticeable reaction resulting in a color change.

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The isotope symbol that fits each description is as follows: 68 neutrons, 47 electrons is Ag b. mass number = 197, 79 electrons is Au c. atomic number = 86, 136 neutrons is Rn d. atomic number = 76, mass number = 192 is Os.

Isotopes are two or more atom types that share the same atomic number (number of protons in their nuclei), location in the periodic table, and chemical element but have distinct nucleon numbers (mass numbers) as a result of having a different number of neutrons in their nuclei. Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic weights and physical characteristics.

The name "isotope" refers to the fact that different isotopes of the same element occupy the same location on the periodic table. The word "isotope" is derived from Greek origins that mean "the same place".

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A 1.50-L vessel is filled with helium at 25.0 °C and 3.04 atm. Under these conditions, the mass of helium is 0.744 g.

An ideal gas is that whose particles have negligible volume and intermolecular forces.

A 1.50 L vessel at 25.0 °C contains He at a pressure of 3.04 atm.

We will use the following expression.

K = °C + 273.15 = 25.0 + 273.15 = 298.2 K

We will use the ideal gas equation.

P × V = n × R × T

n = P × V / R × T

n = 3.04 atm × 1.50 L / (0.0821 atm.L/mol.K) × 298.2 K = 0.186 mol

The molar mass of He is 4.00 g/mol.

0.186 mol × 4.00 g/mol = 0.744 g

A 1.50-L vessel is filled with helium at 25.0 °C and 3.04 atm. Under these conditions, the mass of helium is 0.744 g.

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Chemical bonds involve the interaction between nuclei and electrons. Option D.

Chemical bonds are formed through the interaction between atoms, where electrons in the outermost energy level (valence electrons) are shared, gained or lost between atoms.

This results in the formation of a more stable compound. In these interactions, the positively charged nucleus of each atom attracts the negatively charged electrons of the other atom, creating a bond.

The strength of the bond is determined by the distance between the nuclei and the number of electrons shared between them.

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The heat capacity of a material changes during phase transition under constant pressure because the temperature of the material does not change during phase transition.

The heat that is supplied to the material does not cause the temperature to increase, but rather causes the phase of the material to change. During the phase transition of a solid to a liquid, the temperature remains constant even when heat is added to the material. The added heat energy is used to break the intermolecular bonds that hold the solid together, which results in the solid changing into a liquid.

This means that during the phase transition from a solid to a liquid, the heat capacity of the material under constant pressure will increase because the added heat energy is being used to break the intermolecular bonds instead of increasing the temperature.

Furthermore, during the phase transition from a liquid to a gas, the heat capacity of the material under constant pressure will also increase because the added heat energy is being used to break the intermolecular bonds that hold the liquid together and to overcome the attractive forces between the gas molecules. This causes the liquid to turn into a gas.

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Approximately 3.04 grams of magnesium would be required to react with 0.25 moles of hydrochloric acid.

To determine the mass of Mg required, we need to use the balanced chemical equation for the reaction between hydrochloric acid (HCl) and magnesium (Mg):

2HCl + Mg → MgCl2 + H2

From the balanced equation, we can see that 2 moles of HCl react with 1 mole of Mg. Therefore, if 0.25 mol of HCl reacts, we would need half of that amount, which is 0.125 mol of Mg.

To calculate the mass of Mg required, we need to multiply the number of moles of Mg by its molar mass. The molar mass of Mg is given as 24.31 g/mol. Therefore, the mass of Mg required can be calculated as follows:

Mass of Mg = Number of moles of Mg × Molar mass of Mg

Mass of Mg = 0.125 mol × 24.31 g/mol

Mass of Mg = 3.04 g

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Answer:

Acid rain's effect on stone is a chemical change.

Explanation:

Acid rain has hydrochloric acid which reacts with the calcium carbonate in the stone.

I hope this helps. (Sorry if i am wrong)

Answer:

Plasma - state of matter consisting of freely moving icons and electrons

Differentiate - to distinguish between two or more objects

Ion - atom or molecule with a net electric charge

Primary - most important; fundamental

Answer: c) reflection

Explanation:

Answer:

The answer is C

Explanation:

The frequency of the wave is found to be 7.05×10¹⁴hertz.

The relation between speed of light, frequency and wavelength is given by,

C= fλ

f=c/λ

f= 3×10⁸/425×10⁻⁹

f=7.05×10¹⁴.

Thus, the frequency of the wave is found to be 7.05×10¹⁴ hertz.

The number of waves that pass a specific place in a given period of time is known as the wave frequency. The hertz (Hz) is the SI unit for wave frequency, and 1 hertz is equivalent to 1 wave crossing a fixed point in 1 second. A wave with a higher frequency has more energy than a wave with a lower frequency of the same amplitude.

A wave’s wavelength is the separation between two adjacent waves’ corresponding points. The Greek letter lambda () is typically used to represent a wave’s length. Wavelength is defined as the product of a wave train’s frequency (f) and speed (v) in a medium.

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Answer:

Water plays many important roles in the body including,flushing waste from the body,regulating body temperature,transportation of nutrients and is necessary for digestion.No wonder it is considered "essential"!.Plain water is the best choice for hydrating the body.

Explanation:

hope it helps you><

At equilibrium, the pressure in the container is 5.83 atm.

When dry ice (solid CO2) is placed in the container, it will start to sublimate and convert to gaseous CO2 until equilibrium is reached. At equilibrium, the rate of sublimation will be equal to the rate of deposition and the pressure inside the container will remain constant.

To calculate the pressure at equilibrium, we can use the ideal gas law which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant and T is the temperature in Kelvin.

We know that the initial mass of dry ice is 10.0 g, which is equivalent to 0.248 moles of CO2. Since the container is closed, the number of moles of CO2 at equilibrium will remain constant. Therefore, we can rearrange the ideal gas law to solve for the pressure:

P = nRT/V

Substituting the values, we get:

P = (0.248 mol) x (0.08206 L atm/mol K) x (298 K) / (12.0 L) = 5.83 atm

Therefore, the pressure in the container at equilibrium is 5.83 atm.

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Answer: The protonation of trimethylamine can be represented by the following equilibrium reaction:

(CH3)3N + H2O ⇌ (CH3)3NH+ + OH-

The equilibrium constant for this reaction, which is the base ionization constant (Kb) of trimethylamine, is 6.31 x 10^-5 at 25°C.

The Kb expression for this reaction is:

Kb = [ (CH3)3NH+ ][OH-] / [(CH3)3N]

At equilibrium, we can assume that [OH-] = [ (CH3)3NH+ ] since one mole of hydroxide ion is produced for every mole of trimethylamine that is protonated. Therefore, we can simplify the Kb expression to:

Kb = [ (CH3)3NH+ ]^2 / [(CH3)3N]

We can rearrange this expression to solve for [ (CH3)3NH+ ]:

[ (CH3)3NH+ ] = sqrt(Kb * [(CH3)3N])

Plugging in the given values, we get:

[ (CH3)3NH+ ] = sqrt(6.31 x 10^-5 * 0.36 M) = 0.0104 M

The concentration of hydroxide ion in the solution is also equal to [ (CH3)3NH+ ] since the reaction produces one mole of hydroxide ion for every mole of trimethylamine that is protonated.

pOH = -log[OH-] = -log[ (CH3)3NH+ ] = -log(0.0104) = 1.98

Using the relation pH + pOH = 14, we get:

pH = 14 - pOH = 14 - 1.98 = 12.02

Therefore, the pH of the 0.36 M solution of trimethylamine is 12.0 (rounded to 1 decimal place).

The reaction would be endothermic since heat flowed INTO the system

The temperature of the water bath would down since heat left the water and entered the system

The piston would move in since it is doing work ON the system.

The reaction would absorb energy since both heat and work are being done ON the system

∆E = q + w = 270. kJ + 365. kJ = 635 kJ of energy absorbed by the reaction

How hot or cold something is can be expressed numerically using the physical concept of temperature. Temperature is measured with a thermometer.

Different temperature scales, which traditionally established various reference points and thermometric materials, are used to calibrate thermometers. The most widely used scales are the Kelvin scale (K), which is mostly used in science, the Fahrenheit scale (°F), and the Celsius scale, also referred to as centigrade and denoted by the unit symbol °C. The kelvin is one of the seven base units in the International System of Units (SI).

The complete question is:

A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1atm. The cylinder is also submerged in a large insulated water bath.

The temperature of the water bath is monitored, and it is determined from this data that  270.kJ of heat flows into the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the piston does 365.kJ of work on the system during the reaction.

a) Is the reaction endo- or exo- thermic?

b) Does the temp. of the water bath go up or down?

c) Does the piston move in or out?

d) Does the reaction absorb or release energy?

e) How much energy does the reaction absorb or release? Be sure your answer has the correct number of significant digits.

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