draw the step-by-step mechanism for the pechmann condensation reaction performed using correct curved arrow notation and all proton transfer steps.

Answer:

Democritus

Explanation:

Democritus first introduced the idea of the atom almost 2500 years ago. Democritus was an important philosopher however if your talking about how the atom is today look at first rudimentary   pudding model by JJ Thomson first design then its Neils  Bohr whos model we look at today

The cell reaction is Ag(aq) + Cr3+(aq) → Ag(s) + Cr2+(aq). The standard cell potential is 0.742 V.

A voltaic cell is a device that utilizes a spontaneous chemical reaction to generate electricity. A half-cell is a component of the voltaic cell that contains either an oxidizing or reducing agent.

The salt bridge is used to connect the two half-cells and prevent mixing of the solutions.The given cell reaction is Ag(aq) + Cr3+(aq) → Ag(s) + Cr2+(aq).

This reaction takes place in two half-cells.

In one half-cell, Ag is oxidized to Ag+.

In the other half-cell, Cr3+ is reduced to Cr2+.

The cell potential, Ecell, can be calculated using the Nernst equation:

Ecell = E°cell - (RT/nF)

lnQwhere E°cell is the standard cell potential,

R is the gas constant,

T is temperature in kelvin,

n is the number of electrons transferred in the reaction,

F is the Faraday constant, and

Q is the reaction quotient.

The standard cell potential for the given cell reaction is 0.742 V.

Therefore, the cell generates 0.742 volts of electrical potential difference.

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Answer:

3000 Nm^2

Explanation:

We must remember that pressure is defined as force per unit area.  

We have been given the following information in the question;

Area of the tank= 1.5 m^2

Weight of water in the tank = 4500N

And;

P = F/A

F= force

A = area

P = 4500 N/1.5m^2

P= 3000 Nm^2

Answer: heat

Explanation:

Heat conduction, commonly known as diffusion, is the direct microscopic exchange or transfer of kinetic energy between particles (such as molecules) or quasiparticles (such as lattice waves) across a boundary.

The volume of 28.9grams of sulfur dioxide at STP is 10.11L.

The volume of a gas can be calculated using the ideal gas law equation as follows:

PV = nRT

Where;

According to this question, 28.9grams of sulfur dioxide is given. First, we convert the mass to number of moles as follows:

moles = 28.9g ÷ 64.066 g/mol = 0.451moles

At STP, the following applies;

1 × V = 0.451 × 0.0821 × 273

V = 10.11L

Therefore, 10.11L is the volume of the sulfur dioxide gas.

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Answer:

Hess’s Law describes how the __Heat__ energy of a reaction consists of the _Enthalpy__ of the energy changes of the individual step reactions

Explanation:

Hess law is a legendary law which is given by

\(\\ \rm\Rrightarrow ∆H_{net}=\sum \delta H_r\)

The fuel value of the sugar in the 2.0 L pitcher of sweetened Kool-Aid is 6,800 kg.

To calculate the fuel value of the sugar in the 2.0 L pitcher of sweetened Kool-Aid, we need to multiply the mass of the sugar by its fuel value.

Given that the average fuel value of sugars is 17 kg/g and the pitcher contains 400 g of sugar, we can calculate the fuel value as follows:

Fuel value = Mass of sugar * Fuel value of sugar

= 400 g * 17 kg/g

= 6,800 kg

Therefore, the fuel value of the sugar in the 2.0 L pitcher of sweetened Kool-Aid is 6,800 kg.

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The fact that real yield is lower than theoretical yield is not due to the conservation of mass. According to the rule of conservation of mass, no new mass may be formed during a chemical process.

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the question is incomplete. the question you are looking for is

Which of the following is not a reason why actual yield is less than theoretical yield?

A. Impure reactants present

B. Loss of product during purification

C. Conservation of mass

D. Competing side reactions

Answer:

Warming it would make it come out. On a cold day the honey is frozen and atoms will not move as fast and are close toghether. When you warm it the atoms will move faster and the honey will come out of the bottle

Explanation:

Answer:

0.10 moles H₂O

Explanation:

The unbalanced equation:

NH₃ (g) + O₂ (g) ----> NO (g) + H₂O (g)

Reactants: 1 nitrogen, 3 hydrogen, 2 oxygen

Products: 1 nitrogen, 2 hydrogen, 2 oxygen

The balanced equation:

4 NH₃ (g) + 5 O₂ (g) ----> 4 NO (g) + 6 H₂O (g)

Reactants: 4 nitrogen, 12 hydrogen, 10 oxygen

Products: 4 nitrogen, 12 hydrogen, 10 oxygen

Now that the reaction is balanced, you can use the coefficients of the desired molecules to construct the mole-to-mole ratio. This ratio should be multiplied by the given value (0.085 moles). It is important to arrange the ratio in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 2 sig figs to match the given value.

0.085 moles O₂          6 moles H₂O
-------------------------  x  ------------------------  =  0.10 moles H₂O
                                      5 moles O₂

Answer:

I THINK expose all six plants to green light

Explanation:

Decreasing the afferent arteriole radius would decrease glomerular filtration rate.

The glomerular filtration rate (GFR) is the rate at which blood is filtered by the glomerulus in the kidneys. It is influenced by various factors, including the radius of the afferent and efferent arterioles.

The afferent arteriole supplies blood to the glomerulus, while the efferent arteriole carries blood away from it. The radius of these arterioles affects the pressure and flow of blood into and out of the glomerulus.

If the afferent arteriole radius is decreased, it will result in constriction, which will decrease the blood flow into the glomerulus. This decrease in blood flow will lead to a decrease in GFR.

If the efferent arteriole radius is increased, it will result in dilation, which will decrease the resistance to blood flow out of the glomerulus. This decrease in resistance will also lead to a decrease in GFR.

Therefore, the option that would decrease glomerular filtration rate is option b) decreasing the afferent arteriole radius.

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The glomerular filtration rate decreases the afferent arteriole radius. So The correct answer is (b).

Glomerular filtration rate (GFR) is the measure of how much blood passes through the glomeruli each minute. GFR is determined by three factors:

Renal blood flow

The amount of filtrate that can be formed from the blood

The amount of resistance in the glomerular capillaries.

The glomerular capillaries are encircled by two arterioles:

The diameter of the afferent and efferent arterioles has a significant impact on GFR. If the diameter of the afferent arteriole decreases, the glomerular filtration rate (GFR) will also decrease. which states that decreasing the afferent arteriole radius would decrease the glomerular filtration rate.

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Today, the voltaic pile is better known as a battery.

Alessandro Volta's 1800 invention, the voltaic pile, is today better known as an electric battery. The voltaic pile was the first electrical battery that could continuously provide an electric current to a circuit. The invention of the voltaic pile opened up new avenues of research and exploration in the field of electrochemistry, which studies the relationship between electricity and chemical reactions.

It consisted of alternating layers of zinc and copper discs separated by pieces of cardboard or cloth soaked in an electrolyte solution such as brine or dilute acid. The Voltaic pile produced a continuous and stable electric current, which was a groundbreaking discovery in the field of electricity. Although the Voltaic pile was eventually replaced by more efficient battery designs, its invention laid the foundation for the development of modern batteries and the field of electrochemistry.

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Answer:

D. It is supported by adequate data

Explanation:

A theory is a well-substantiated explanation

Hope this helps!

Have a great day. :)

Pyruvate carboxylase converts pyruvate into acetyl-CoA. 2. Acetyl-CoA carboxylase transforms acetyl-CoA into a-ketoglutarate.

1) Acetyl CoA condenses with oxaloacetate to create citrate (6C), which releases coenzyme A.

2. The transformation of citrate into its isomer, isocitrate.

3) Dehydrogenation and decarboxylation of isocitrate result in the formation of -ketoglutarate (5C)

Pyruvate is transformed into phosphoenolpyruvate (PEP) by the enzyme pyruvate carboxylase, and then PEP is transformed into oxaloacetate (OAA) by the enzyme phosphoenolpyruvate carboxy-kinase. This process results in the net synthesis of a ketoglutarate from pyruvate. Following this, the enzyme glutamate dehydrogenase transforms oxaloacetate into ketoglutarate (KG). Since all three enzymes are not dependent on the citric acid cycle, this process does not remove any intermediates from the cycle. 

Also, because all three enzymes have reversible catalysis, the finished product (KG) can be reversed to its original starting substance (pyruvate). It is both a glutamate and glutamine source and a nitrogen scavenger, which encourages muscle protein synthesis and prevents muscle protein breakdown.

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The periodic table has changed very little since it was originally developed by Mendeleev and Meyer is referred to as a false statement.

This is defined as the arrangement of elements based on their atomic number in a tabular form. It consists of 18 vertical columns which re referred to as groups and seven horizontal rows called period.

Henry Moseley in 1913 organized Mendeleev's periodic table based on physical properties.This took into consideration their atomic number rather than atomic mass and other missing elements.

This is the periodic table which is used currently and therefore hasn't changed much which is why false was chosen.

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The steps done and develops human skills or builds structures to reduce risk you are doing​ is a. capacity building.

The capacity building is the process of the developing the skill or the strengthening the skills. There are the four steps in the capacity building.

1) Needs the assessment

2) Design

3) Implementation

4) Monitoring

These are process to reduce the risk of what you are doing. The capacity building includes the leadership developments. The capacity budling consist of the training and the mentorships.

Thus the capacity budling is The steps done and develops human skills or builds structures to reduce risk you are doing​

This question is incomplete, the complete question is :

The step done and develops human skills or builds structures to reduce risks you are doing.

a. capacity building

b. training

c. facility constructing

d. skills honing

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The Lewis acid is BBr3. In order to understand the answer more precisely, let's discuss the given terms and the question

What is a Lewis Acid?

In chemistry, the Lewis acid is a species of the compound or ion that can act as an electron pair acceptor to form a chemical bond. In other words, it is an electron acceptor. For example, Boron trifluoride (BF3) is a Lewis acid because it can accept an electron pair from the Lewis base such as NH3 and form a bond. This reaction is called Lewis Acid-Base reaction.The question states that which one of the following is a Lewis acid.

There are four options; NH3, BBr3, OH-, and Br-. Out of these options, NH3, OH-, and Br- are Lewis bases. Because they can donate an electron pair and form a bond with a Lewis acid.On the other hand, BBr3 is the only Lewis acid in the given options. It can accept an electron pair and form a bond with the Lewis base.

Thus, the answer is BBr3. It is important to note that if the question provides some other options, we will have to compare all of them to decide which one is a Lewis acid.

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Isomers are compounds that have the same molecular formula, meaning they contain the same types and numbers of atoms but differ in their structural arrangement or spatial orientation.

The five possible isomers corresponding to the formula C7H16, along with their names:

1.  Heptane:

    CH3-CH2-CH2-CH2-CH2-CH2-CH3

2. 2-Methylhexane:

    CH3-CH2-CH(CH3)-CH2-CH2-CH3

3. 3-Methylhexane:

    CH3-CH2-CH2-CH(CH3)-CH2-CH3

4. 2,2-Dimethylpentane:

    CH3-C(CH3)2-CH2-CH2-CH3

5. 2,3-Dimethylpentane:

    CH3-CH(CH3)-CH(CH3)-CH2-CH3

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Answer:

Because the sun is low on the horizon, sunlight passes through more air at sunset and sunrise than during the day, when the sun is higher in the sky. More atmosphere means more molecules to scatter the violet and blue light away from your eyes.

When 1 mol of liquid diethyl ether at its standard boiling point is given an enthalpy of vaporization of 26.52 kJ/mol, the temperature of the liquid will remain the same, but the physical state of the diethyl ether will change from liquid to vapor.

The enthalpy of vaporization is the energy required to convert one mole of a liquid into a vapor and is also known as the heat of vaporization. When the enthalpy of vaporization is applied to liquid diethyl ether, it causes the liquid to become a vapor.

In order to understand this concept, it is helpful to look at the thermodynamic process of vaporization, or boiling. Vaporization involves the conversion of liquid to a gas at the standard boiling point by the absorption of energy, which is provided in the form of heat.

During vaporization, the liquid molecules move quickly and gain enough energy to escape the surface of the liquid and form a gas. This process is also reversible, so as the vaporized molecules lose energy, they can condense back into the liquid state.

Therefore, the temperature remains the same, but the liquid is converted to a vapor. This vapor can eventually condense back into liquid form, depending on the temperature and pressure of the system.

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Answer:

The Milky Way

Explanation:

Answer:

The Milky Way

Explanation:

Plants produce glucose and oxygen in an endothermic reaction called photosynthesis. The mass of glucose, C6H12O6, made when 1.0g of water reacts with carbon dioxide is 60gm.

Photosynthesis is a process used by plants and other organisms to change light energy into chemical energy that, through cellular respiration, can later be passed to fuel the organism's activities.

6H₂O + 6CO₂ CH12O6 + 602

We must convert the water to moles. We know that the molar mass of

Water 18

= 1 / 18

= 0.055

Now we look at our chemical equation's mole ratios. We can see that

6 moles of water produce 1 mole of glucose.

therefore, we will have 1/3 mol of glucose

The molar mass of glucose is 180

= 60gm of glucose will produce.

Thus, the mass of glucose, C6H12O6, made when 1.0g of water reacts with carbon dioxide is 60gm.

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Answer:

Periodic Table

hope this helps

have a good day :)

Explanation:

The periodic table allows you to compare the elements and understand their properties​.

Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.

It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.

Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.

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Answer:

129.50 N/kg

Explanation:

125 kg + 4.50 N

129.50 N/kg

The solutions to the system with the second right-hand side are x = 10/3 and y -5/3.

To choose a right-hand side which gives no solution, we need to make the two equations inconsistent. Let's consider the equation 3x + 2y = 10.

If we choose a right-hand side of 20, the equation becomes 3x + 2y = 20.

To make this inconsistent with the second equation, we can choose a right-hand side of 30. So, the first right-hand side that gives no solution is 20.

To choose a right-hand side which gives infinitely many solutions, we need to make the two equations dependent. Let's consider the second equation 6x + 4y = ?.

To make this dependent with the first equation, we need the two equations to be scalar multiples of each other. We can achieve this by choosing a right-hand side of 0 for the second equation. So, the second right-hand side that gives infinitely many solutions is 0.

For the two equations 3x + 2y = 10 and

6x + 4y = 0, the solutions can be found by solving the system of equations.

By substitution or elimination, we can find that the solution to this system is x = 10/3

and y = -5/3.

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Answer:

Water (H2O) and Sodium (Na) are reactants.

Explanation:

2H2O+2Na......2NaOH+H2

In the above reaction the water (H2O) and sodium (Na) are reactants and sodium hydroxide (NaOH) and hydrogen are products.

And this is the single displacement reaction.