consider the half reactions below for a chemical reaction.what is the overall equation for this chemical reaction?

To use Hess's Law to calculate the reaction \(C(s) + H_2O(g)\) → \(CO(g) + H_2(g)\), three thermochemical equations are used: \(C(s) + O_2(g)\)→ \(2CO_2(g)\), \(2CO(g) + O_2(g)\) → \(2CO_2(g)\), and\(2H_2(g) + O_2(g)\) → \(2H_2O(g)\). For each equation, the corresponding value needs to be manipulated.

To use Hess's Law, we need to manipulate the given thermochemical equations in a way that they can be added to give the desired equation. For the equation \(C(s) + H_2O(g)\) → \(CO(g) + H_2(g)\), we need to manipulate the given thermochemical equations such that they add up to the desired equation.

The first equation \(C(s) + O_2(g)\)→ \(CO_2(g)\) needs to be multiplied by a factor of 2 and reversed. The second equation \(2CO(g) + O_2(g)\) → \(2CO_2(g)\) can be used as it is. The third equation \(2H_2(g) + O_2(g)\) → \(2H_2O(g)\)needs to be reversed.

The manipulated values for the three equations are:

\(2CO_2(g)\) → \(2CO(g) + O_2(g)\) \(H = \(\Delta \)-566 kJ/mol\) (reverse the first equation and multiply by 2)

\(2CO(g) + O_2(g)\) →\(2CO_2(g)\) \(\(\Delta \)H = -566 kJ/mol\) (use the second equation as is)

\(2H_2O(g)\) → \(2H_2(g) + O_2(g)\) \(\(\Delta \)H = +484 kJ/mol\) (reverse the third equation)

By adding these manipulated values, we get the desired equation \(C(s) + H_2O(g)\) → \(CO(g) + H_2(g)\) with a calculated ΔH of -131 kJ/mol.

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Answer:

Start with your basic equation for pH

pH = - log [H+]

then rearrange the equation to solve for [H+]

just like to get move something multiplied from the one side to the other you divide both sides by that number ( a*b = c …. a*b/b = c/b …. a = b/c), you do the ‘inverse’ of a log function, which is 10^

first bring the - over

-pH = log [H+]

then remove the log by taking 10^ on both sides

10^(-pH) = 10^(log [H+])

10^(-pH) = [H+]

and there is your relationship.

Explanation:

Balanced Equation: CaSiO3 + 2 CO2 + H2O = Ca(HCO3)2 + SiO2

One or more chemical substances can react with each other and form one or more new substances through a process which is referred to as chemical reaction.

Reactants are the elements required for a reaction's initialization.

The components that remain after a reaction are called products.

Each kind of atom is to be present on both the reactant and product side of a chemical equation in a chemical reaction in order for it to be balanced.

On both sides of balanced chemical equations, the same number and type of each atom can be found.

A balanced chemical equation must have coefficients that are the smallest whole number ratio.

Mass is always conserved in chemical processes.

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The air-fuel ratio (mass basis) for complete combustion of pentane (C5H12) with the stoichiometric amount of air is approximately 46 parts of air to 1 part of pentane.

To determine the air-fuel ratio for complete combustion, we need to balance the chemical equation for the combustion of pentane (C5H12) with oxygen (O2) from the air.

The balanced equation is as follows:

C5H12 + 8O2 -> 5CO2 + 6H2O

From the balanced equation, we can see that for every 1 mole of pentane, we need 8 moles of O2 for complete combustion. To convert this to a mass basis, we need to consider the molecular weights of pentane (C5H12) and oxygen (O2).

The molecular weight of pentane (C5H12) is:

(5 * atomic weight of carbon) + (12 * atomic weight of hydrogen)

= (5 * 12.01 g/mol) + (12 * 1.01 g/mol)

= 72.11 g/mol + 12.12 g/mol

= 84.23 g/mol

The molecular weight of oxygen (O2) is:

2 * atomic weight of oxygen

= 2 * 16.00 g/mol

= 32.00 g/mol

Now we can calculate the air-fuel ratio (mass basis):

Air-fuel ratio = (8 * molecular weight of O2) / molecular weight of pentane

Air-fuel ratio = (8 * 32.00 g/mol) / 84.23 g/mol

Air-fuel ratio  = 256.00 g/mol / 84.23 g/mol

Air-fuel ratio  ≈ 3.04

This means that for every 1 gram of pentane, approximately 3.04 grams of oxygen from the air are required for complete combustion.

The air-fuel ratio (mass basis) for complete combustion of pentane (C5H12) with the stoichiometric amount of air is approximately 46 parts of air to 1 part of pentane.

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Answer:

Chromatography

Explanation:

Chromatography is a technique for separating mixtures that involves the use of a moving liquid and filter paper. The solvent travels through the spots on the paper, taking the chemicals away in the opposite direction. If the solvent combination has been properly chosen, each of them will move at a different velocity than the others.

You have two gases, A and B, each in its own container of equal volume, pressure, and temperature. As a result, each gas must contain the same number of moles.

Because the two temperatures are the same, the two samples' average kinetic energies are also the same.

Kinetic energy is a type of energy that a moving object or particle possesses. When an item undergoes work—the transfer of energy—by being subjected to a net force, it accelerates and acquires kinetic energy. A moving object or particle's kinetic energy, which depends on both mass and speed, is one of its properties. The type of motion could be vibration, rotation on an axis, translation (or travel along a path from one place to another), or any combination of these.

A body's translational kinetic energy, or 1/2mv2, is equal to one-half the product of its mass, m, and the square of its velocity, v. In chemistry, the moles, sometimes spelled mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or other predetermined particles. The mole represents 6.02214076 1023 units, which is a very huge number.

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Answer:

Fe₂O₃

Explanation:

To solve this question we must find the moles of Iron in 1.68g. With the difference of the masses we can find the moles of oxygen. The formula will be obtained with the ratio of both amount of moles:

Moles Fe:

1.68g * (1mol / 56g)  =0.03moles

Moles O:

2.40g-1.68g = 0.72g * (1mol/16g) = 0.045moles

The ratio O/Fe is:

0.045moles / 0.03moles = 1.5 moles. this ratio is obtained if the formula is:

Answer:

Photosynthesis is the process takes place in green plants in which the plants convert the carbon dioxide and water into the sugar molecule and oxygen in presence of the sunlight. The sunlight is trapped by the chlorophyll pigment, carbon dioxide uptake is facilitated by the stomata present on the leaves in the epidermis.

The water moves from the roots to the leaves and stem where it is used for photosynthesis and transpiration. The movement of water is through the xylem and sugar is move through the phloem from the leaves to a different part of the plant for nutrition and further process.

Chemical similarity (or molecular similarity) is the likeness of chemical elements, molecules, or chemical compounds in terms of either structural or functional features, i.e. the impact that the chemical substance has on reaction partners in inorganic or biological environments.

The empirical formula of a molecular simplification is defined as the lowest ratio of atoms. The empirical formula and the molecular formula are therefore connected. The information about the elements contained in a molecule and their ratios is provided by both the molecular formula and the empirical formula.

While a compound's structural formula provides the same information as its molecular formula, it additionally reveals the atoms' connections inside the molecule.

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Answer:

C

Explanation:

Mitochondria provides energy (ATP) for cells to use

Nucleus provides genetic code (DNA)

Ribosomes assemble amino acids chains based on the DNA from nucleus to form proteins

Answer:

c

Explanation:

Answer:

This all should be correct:

c

a

c

a

Answer:

C, A, B, B

Explanation:

Question 1: C. inner core

Why? Because the inner core is literally the center of the Earth. Meaning it is the hottest part of the Earth.

Question 2: A. crust

Why? The crust is the outer most layer which is the layer we walk on so to speak. The Earth can be broken up into four layers and as said before the crust is the outer part of it. It is actually amounts to less than 1% of Earth's volume.

Question 3: B. basalt

Why? If we were to average the oceanic crust we would get something around six kilometers and this is the thickness. This is mostly made up of basalt.

Question 4: B. outer core

Why? Due to difference in pressure and temperature the outer core tends to release dense matter which sinks while warm (less dense rises). This causes the Coriolis force, resulting from the Earth's rotations.

Answer: 157.8 g

Explanation: I hope this help my child UwU

What is the weight of the ethyl alcohol that exactly fills a 200.0 mL container the density of ethyl alcohol is 0.789 g ml?

Density review

A

B

What is the weight of the ethyl alcohol that exactly fills a 200.0 mL container? The density of ethyl alcohol is 0.789 g/mL.

g = (0.789 g/mL) (200.0 mL) = 158 g

Answer:

\(\boxed {\tt 197.25 \ grams }\)

Explanation:

The density formula is:

\(d=\frac{m}{v}\)

Rearrange the formula for m, the mass. Multiply both sides of the equation by v.

\(d*v=\frac{m}{v} *v\)

\(d*v=m\)

Mass can be found by multiplying the density and volume. The density of ethyl alcohol is 0.789 grams per milliliter. The alcohol fills a 250 milliliter graduated cylinder, so the volume is 250 milliliters.

\(d= 0.789 \ g/mL \\v= 250 mL\)

Substitute the values into the formula.

\(0.789 \ g/mL * 250 \ mL=m\)

Multiply. Note that the milliliters, or mL will cancel each other out.

\(0.789 \ g * 250=m\)

\(197.25 \ g=m\)

The mass of the ethyl alcohol is 197.25 grams.

The carbonyl stretching frequency in the infrared spectrum depends on the nature of the carbonyl group and the adjacent functional groups or substituents. Based on this, we can rank the given molecules in terms of their carbonyl stretching frequency, from highest to lowest:

2,4-cyclohexadienone > 2-cyclohexenone > cyclohexenone > cyclohexanone

In general, a carbonyl group adjacent to an electron-withdrawing group will have a higher stretching frequency compared to a carbonyl group adjacent to an electron-donating group.

In 2,4-cyclohexadienone, the two carbonyl groups are conjugated with each other and with the double bonds in the ring, resulting in a very high carbonyl stretching frequency. In 2-cyclohexenone, the carbonyl group is conjugated with the double bond in the ring, resulting in a slightly lower stretching frequency.

In cyclohexenone, the carbonyl group is adjacent to a single double bond in the ring, resulting in a lower stretching frequency compared to 2-cyclohexenone. In cyclohexanone, the carbonyl group is not conjugated with any other functional group, resulting in the lowest carbonyl stretching frequency among the given molecules.

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The maximum pressure that the tank can with stand before bursting is 50.0 atm when the butane gas is heated to a temperature of 500.0°C.

The pressure in the tank of butane gas will rise when the temperature is raised from 22.0°C to 500.0°C. With the help of the original pressure, temperature, and quantity of gas in the tank, along with the Ideal gas law PV=nRT, the new pressure may be determined. Approximately 49.4 atm will be the new pressure.

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Answer:

d

Explanation:

stop answering people questions and not actually helping them typing random stuff like i just did here

It describes DNA passed from parent to offspring as the driving force of evolution.

What is evolution?

therefore option D is the correct answer.

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Answer:

If the molecules are heated further, the liquid water will become water vapor, which is a gas. Gas particles have more energy and are on average at distances from each other which are much larger than the size of the atoms/molecules themselves.

The cube root of a number is the reverse of the cube of a number and it can be found by prime factorization method. The cube root of 8000 is 20.

Prime Factorization is the finding which prime numbers multiply together to make the original number. A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number.

Prime factorization of 8000 is 2 × 2 × 2 × 2 × 2 × 2 × 5 × 5 × 5

Simplifying the above expression: \(2^{6}\) * \(5^{3}\)

Simplifying further: \(20^{3}\)

Therefore, the cube root of 8000 by prime factorization is (2 × 2 × 2 × 2 × 2 × 2 × 5 × 5 × 5)1/3 = 20.

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Answer

acidic

Explanation

The pH scale ranges from 0 to 14, with 7 being neutral. pHs less than 7 are acidic while pHs greater than 7 are alkaline (basic).

Hence, coffee has a pH of about 5 which means it is considered to be in the acidic range.

The molarity of the base would be 0.36 M.

What is Molarity?

The number of moles of dissolved solute per litre of solution is the definition of molarity, a unit of concentration. Molarity is defined as the number of millimoles per millilitre of solution by dividing the number of moles and the volume by 1000. A precise 1.000 mole of KCl (74.55 g) must be dissolved in a quantity of water or another solvent to produce a precise 1.000 litre of solution in order to create a 1.000 M solution of KCl.

In actuality, this concentration unit is frequently abused. Since KCl is totally dissociated, the solution, for instance, with water as the solvent, is exactly 1.000 M in K+ and 1.000 M in Cl.

Recall that: mole = molarity x volume

Also; molarity = mole/volume

Mole of 0.624 M, 27.4 mL HBr = 0.624 x 27.4/1000

                                                 = 0.017 mol

If the mole of HBr is 0.017 mol, the equivalent mole of NaOH will also be 0.017 mol.

0.017 mol of 47.2 mL (0.0472 L) NaOH would molarity of:

0.017/0.0472 = 0.36 M

In other words, the molarity of the NaOH is 0.36 M.

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Lowering the temperature and increasing the pressure of the solution would generally result in a solid coming out of a solution through crystallization.

Crystallization is a process in which a solid forms from a solution by the arrangement of particles into a regular, repeating pattern. Here are the steps involved:

1. Dissolving: Initially, a solute is dissolved in a solvent to form a solution. The solute particles are dispersed and surrounded by the solvent molecules.

2. Saturation: The solution is then brought to a state of saturation by adding more solute or removing the solvent, such that no more solute can dissolve. At this point, the solution contains a high concentration of the solute.

3. Nucleation: When the solution becomes saturated, it becomes unstable, and the solute molecules start to come together and form tiny clusters or nuclei. These nuclei serve as the starting points for crystal growth.

4. Crystal Growth: Once the nuclei form, they start growing as more solute particles join the crystal lattice. This growth occurs by the addition of solute molecules from the solution onto the existing crystal surface.

Now, let's look at how temperature and pressure affect this process:

- Lowering the temperature: Decreasing the temperature of the solution slows down the movement of solute molecules, reducing their kinetic energy. This leads to a decrease in solubility, meaning less solute can remain dissolved in the solution. As a result, excess solute comes out of the solution and starts forming crystals.

- Increasing the pressure: When the pressure of the solution is increased, it compresses the solvent and alters its properties. This compression can enhance the solubility of the solute, allowing it to dissolve more effectively. Consequently, increasing pressure generally inhibits crystallization as more solute remains dissolved in the solution.

Therefore, lowering the temperature favors crystallization by decreasing solubility, while increasing the pressure generally inhibits crystallization by increasing solubility.

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Explanation:

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Food group has the largest carbon footprint and requires the most water to produce is bovine meat

The carbon footprint is the total amount of greenhouse gases that are generated by our action and the average carbon footprint for a person in the united state is 16 tons and one of the highest rates in the world and globally the average carbon footprint is closer to 14 tons and beef has the highest carbon footprint of any food and this is because of what is required to raise and farm cattle and animals used for beef production require a tremendous amount of feed and which must be grown on its own and they also produce an extremely high amount of methane and meat as well as cheese and eggs have the highest carbon footprint and in the fruits, vegetables as well as beans and nuts have much lower carbon footprint

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The correct answer is C, pOH=14−pH.

In pure water, the concentration of H+ ions is equal to the concentration of OH- ions, which means that the pH and pOH of pure water are equal at 7. At higher temperatures, some of the water molecules ionize into H+ and OH- ions, causing the pH to decrease and the pOH to increase.

Since the measured pH at 50°C is 6.6, we can calculate the pOH using the equation:

pH + pOH = 14

pOH = 14 - pH

Substituting the measured pH of 6.6 into the equation gives:

pOH = 14 - 6.6 = 7.4

Therefore, the correct answer is C, pOH=14−pH.

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The scientific notation : A. 9.594 x 10⁻³

Scientific Notation consists of 2 parts  

1. the first part: the first digit followed by the decimal point  

2. The second part: the power of 10 (the exponents).which shows the number of digits after the decimal point

Multiply scientific notation :

1. multiply coefficients

2. add the exponents.

3. converted to scientific notation.

3.120 x 10⁻⁷ x 3.075 x 10⁴ =

\(\tt 3.120\times 3.075=9.594\)

\(\tt 10^{-7}\times 10^4=10^{-7+4}=10^{-3}\)

\(\tt 9.594\times 10^{-3}\)

Answer:

Here boron-11 means the name of the element is boron and the mass number is 11

Explanation:

Answer:

8.59 g/cm3

Explanation:

mass = 535,000 mg = 535,000 x 10^-3 g = 535 g

volume = 62.3 cm3

density = m/V = 535 / 62.3 = 8.58747993579 g/cm3 or 8.59 g/cm3

Answer:

pH=14-pOH

1. B

pOH= 14- pH

2.B

Explanation:

Answer:

1. B

pH=14-pOH

2.B

pOH= 14- pH

Explanation: