How many moles of sodium acetate must be added to a liter of 0.5 N acetic acid to produce a buffer solution of pH 4.5 (ignore the volume change)? The pKa of acetic acid is 4.76. How many grams of sodium acetate (M.W. 82 g/mole) would be required?

Answer:

● They have more than two carbons that are bonded to only one other

Explanation:

They have carbons bonded in a single row from one end of the molecule to the other end of the molecule. ... The straight-chain alkane has two more hydrogen atoms than the cycloalkane

Answer:

D. They have carbons bonded in a single row from one end of the molecule to the other end of the molecule.

Explanation:

I got it wrong when I chose C - They have more than two carbons that are bonded to only one other carbon. So yeah p.s UNUS ANNUS

When alkaline hydrolysis was first invented, people were hired for various roles related to the process and implementation of this technology. Some of the jobs that emerged include Chemical engineers, Technicians and operators, Waste management specialists, Scientists and researchers.

Chemical engineers: These professionals played a crucial role in developing and optimizing the alkaline hydrolysis process. They were responsible for designing the equipment, developing the necessary chemical reactions, and ensuring the efficient operation of the system.

Technicians and operators: Skilled technicians and operators were hired to operate and maintain the alkaline hydrolysis equipment. They were trained to monitor the process parameters, handle the chemicals involved, and ensure the proper functioning of the system.

Waste management specialists: With the introduction of alkaline hydrolysis as a method for disposal of organic waste, specialized professionals in waste management were employed to oversee the proper handling and treatment of the waste materials. They were responsible for implementing safety protocols, managing waste streams, and complying with environmental regulations.

Scientists and researchers: Alkaline hydrolysis required scientific expertise for continuous improvement and innovation. Scientists and researchers were hired to study the process, analyze the results, and explore potential applications in various fields such as biofuel production and chemical synthesis.

Overall, the introduction of alkaline hydrolysis created employment opportunities for professionals in engineering, chemistry, waste management, and research, among others, as this technology gained recognition and adoption.

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Answer:

Heat is transferred by conduction when adjacent atoms vibrate against one another, or as electrons move from one atom to another. Conduction is the most significant means of heat transfer within a solid or between solid objects in thermal contact.

Explanation:

have a great day

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Answer:

its molecules

Explanation:

2021 edge

The actual molecule of SeO2 is a resonance hybrid of the two resonance structures. In the correct resonance structure (B), there is a double bond between each oxygen atom and the selenium atom. This gives SeO2 a resonance hybrid that is the average of the two resonance structures.

Resonance structure is a hypothetical structure which represents the actual bonding in a molecule. It is different from the actual structure but provides a better description of the bonding in the molecule. The correct resonance structures for SeO2 are:

A: It is incorrect as it has an extra double bond.

B: It is the correct resonance structure of SeO2

C: It is incorrect as it has no resonance effect in the molecule.

D: It is incorrect as it has an extra double bond, which is not present in the actual molecule.

In the actual molecule, the Se atom is bonded to two O atoms, and each O atom is bonded to Se by a double bond. Therefore, the actual molecule of SeO2 is a resonance hybrid of the two resonance structures. In the correct resonance structure (B), there is a double bond between each oxygen atom and the selenium atom. This gives SeO2 a resonance hybrid that is the average of the two resonance structures.

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The two resonance structures for SeO2 (selenium dioxide) depict the different ways the bonds and electrons could be arranged within the molecule. The molecule has a V-shape with Selenium at the center, connected to two Oxygen atoms. The delocalization of pi electrons is shown by two major resonance structures.

The resonance structures for the compound SeO2 (selenium dioxide) are determined by the placement of electrons and bonds within the molecule. A molecule can have multiple possible structures, known as resonance structures, which depict the various ways that bonds and electrons can be arranged.

The molecule SeO2 features a V-shaped molecular geometry, with the Selenium (Se) atom at the center connected to two Oxygen (O) atoms, and has two pairs of lone electrons on Selenium. There are two major resonance structures: one with a double bond between Selenium and one Oxygen atom, and a single bond with the other Oxygen atom, and another with the positions of these bonds reversed. This shows the delocalization of pi electrons.

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The potential energy decreases as kinetic energy increases. Hence, option C is correct.

Potential energy is stored energy that depends upon the relative position of various parts of a system.

To shoot an arrow, the string has to be released. The kinetic energy is converted by the potential energy of the bow. Therefore, potential energy is converted into kinetic energy.

Hence, option C is correct.

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A positive ion is a neutral atom that has lost one or more protons. A negative ion is a neutral atom that has gained one or more protons.

A positive ion is a neutral atom that has lost one or more electrons. In contrast, a negative ion is a neutral atom that has gained one or more electrons. In addition, when an atom loses or gains one or more electrons, it acquires a charge. A positive ion is created when an atom loses one or more electrons, resulting in a net positive charge. An atom that has one fewer electrons than protons will have a net positive charge. On the other hand, a negative ion is formed when an atom gains one or more electrons, resulting in a net negative charge. An atom that has one more electron than protons will have a net negative charge.

Electrically charged atoms are known as ions. Positively charged ions are known as cations, whereas negatively charged ions are known as anions. The charge of an ion is determined by the number of protons and electrons it has gained or lost.

A positive ion has also gained one or more electrons, while a negative ion has lost one or more electrons. Additionally, a positive ion has lost one or more neutrons, and a negative ion has gained one or more neutrons.

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Answer:

which question is it for

Answer:

It's Simple earth just moves noob

By the use of the Boyle's law as we can see in the solution below, the pressure is  51.5 units.

Boyle's law is a principle in physics that describes the relationship between the pressure and volume of a gas at a constant temperature.

It states that the pressure of a gas is inversely proportional to its volume, meaning that if the volume of a gas is decreased, the pressure will increase proportionally, and if the volume is increased, the pressure will decrease proportionally.

Using the Boyles law;

P1V1 = P2V2

P2 = P1V1/V2

P2 = 12.8 * 40.2/10

P2 = 51.5

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Salt X is 0.05 M (molar concentration) soluble at 25°C.

To calculate the solubility of salt X at 25°C, we need to determine the amount of salt that dissolves in a given volume of solution. In this case, we have a saturated solution containing 0.28 g of salt X in 100 cm³ of solution.

The solubility is defined as the maximum amount of solute that can dissolve in a given amount of solvent at a specific temperature. Therefore, the solubility of salt X is given by the ratio of the mass of the solute (0.28 g) to the volume of the solution (100 cm³).

Solubility = Mass of solute / Volume of solution

Solubility = 0.28 g / 100 cm³

Since the solubility is expressed in grams per cubic centimeter (g/cm³), we can directly use the given values.

Solubility of salt X = 0.28 g / 100 cm³

To determine the solubility in mol/L (Molar concentration), we need to convert the mass of the solute to moles. The molar mass of salt X is given as 56 g/mol.

Number of moles = Mass / Molar mass

Number of moles = 0.28 g / 56 g/mol

Number of moles = 0.005 mol

Now, we can calculate the solubility in mol/L (M).

Solubility = Number of moles / Volume of solution (in L)

Solubility = 0.005 mol / 0.1 L

Solubility = 0.05 M

Therefore, the solubility of salt X at 25°C is 0.05 M (molar concentration).

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all of them are right

pls give brainly i really need it PLEASE

Answer:

They can travel at the speed of light.

Explanation:

all electromagnetic waves have the same speed which is equal to the speed of the light.

The fact which all electromagnetic waves have in common is that "They can travel at the speed of light".

Electromagnetic radiation is a type of energy waves that is all around us and takes many forms, such as radio waves, microwaves, X-rays and gamma-rays. Sunlight is also a form of electromagnetic energy, but visible light is only a small portion of the electromagnetic spectrum, which contains a broad range of wavelengths.

In order from highest to lowest energy, the sections of the EM spectrum are named: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves. In order from highest to lowest wavelength, the series is just opposite.

Electromagnetic radiations don't require any medium to travel and also travel in speed of light. They have Electric field vector and magnetic field vector that is perpendicular to each other and also are perpendicular to the direction of propagation.

Therefore, The fact which all electromagnetic waves have in common is that "They can travel at the speed of light".

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The procedure for swapping the titrant with the aliquot volume typically involves filling the buret with the titrant solution and adding it gradually to the solution in the flask until a reaction is complete.

However, if you were to put the NaOH solution in the Erlenmeyer flask and then fill the buret with the KHP solution, there are several procedural considerations that you would need to be aware of.

Firstly, it would be important to ensure that the buret is properly calibrated and that the volume of KHP solution dispensed is accurately recorded to avoid any errors in the final results.

Secondly, the NaOH solution in the Erlenmeyer flask should be stirred thoroughly to ensure that it is well-mixed before adding the KHP solution. This is to ensure that the reaction is completed efficiently and the endpoint is accurately determined.

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Answer:

B

Explanation:

Answer:

D. 3 mol/0.5 L

Explanation:

Just took the quiz

Answer:

The correct answer is Choice D.

(Headaches or backaches)​

Explanation:

Hope this helps!

Please mark me as Brainlinieast.

The mass of CuSO₄.5H₂O that is required to prepare 100 mL of a 0.500 mol/L aqueous solution is 84.3045g.

We know that  0.5-mol/L solution of copper(II) sulfate contains 0.5000 moles of copper(II) sulfate, the solute, for every  

1 L= 10³ml of the solution.

This means that the  sample of copper sulfate must contain,

      = (100ml)x0.5 moles of CuSO₄/10³ml

      =   0.05 moles of CuSO₄.

It should be noted that every mole of copper(II) sulfate pentahydrate contains 1 mole of anhydrous copper(II) sulfate, CuSO4, and 5 moles of water of hydration, H₂O.

This means that in order to deliver 0.05000 moles of anhydrous copper(II) sulfate to the solution, we must deliver 0.05000 moles of copper(II) sulfate pentahydrate.

In addition to the 0.05000 moles of anhydrous copper(II) sulfate, this sample will contain,

= 0.5 moles of CuSO₄.5H₂Ox 5 moles of H2O/1mole of CuSO₄.5H₂O.

= 0.25 moles of H₂O.

Therefore, the total mass of the copper(II) sulfate pentahydrate will be equal to the mass of  

0.5 moles of anhydrous copper(II) sulfate and a mass of  0.25moles of water of hydration.

Then, the total mass of the copper(II) sulfate pentahydrate will be equal to the mass of  

0.5000 moles of anhydrous copper(II) sulfate and the mass of  0.25 moles of water of hydration which is given by,

Mass of CuSO₄ = 0.5x159.609=79.8045g

Mass of 5 moles of H₂O =0.25x18.015 = 4.5 g.

Therefore, the total mass of the copper(II) sulfate pentahydrate that will deliver  

0.5 moles of anhydrous copper(II) sulfate to your solution will be,

79.8045+4.5 = 84.3045g

Therefore, the mass of copper(II) sulfate pentahydrate required to make 100 mL of a 0.500 mol/L aqueous solution is 84.3045g

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Amphetamines work by primarily binding to and blocking dopamine and norepinephrine transporters, thereby increasing the concentration of these neurotransmitters in the synaptic cleft. They can also have effects on serotonin transporters, but to a lesser extent. This prolonged presence of dopamine and norepinephrine in the synaptic cleft leads to increased neurotransmission and stimulation of the central nervous system.

Amphetamines, such as Adderall or methamphetamine, exert their effects by targeting neurotransmitter transporters. The most significant impact is on dopamine transporters (option A). Amphetamines bind to dopamine transporters and block their activity, preventing the reuptake of dopamine into presynaptic neurons. As a result, dopamine remains in the synaptic cleft for a longer time, increasing its concentration and enhancing dopamine signaling.

In addition to affecting dopamine, amphetamines also influence norepinephrine (noradrenaline) levels in the synaptic cleft (option D). They bind to norepinephrine transporters and inhibit their function, leading to increased norepinephrine concentration in the synapse.

While amphetamines can have some impact on serotonin transporters (option C), their effects on serotonin are relatively weaker compared to dopamine and norepinephrine. The precise mechanism of how amphetamines affect serotonin transporters is still not fully understood.

Overall, the primary mechanism of action of amphetamines involves increased dopamine and norepinephrine concentrations in the synaptic cleft, resulting in enhanced neurotransmission and stimulation of the central nervous system.

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Answer:

c)Mixtures are composed of two or more substances.

Explanation:

From the given choices, it is true that mixtures are composed of two or more substances.

An atom is said to be electrically neutral if it has an equal amount of protons and electrons. On the other hand, an atom is electrically charged if its protons and electrons are not distributed evenly.

Neutral atoms are defined as when an atom has an equal amount of protons and electrons, it also has an equal number of electric charges, both positive and negative. As a result, every element in the periodic table has a neutral atomic structure.

Normal atoms have an equal amount of positive and negative particles and a neutral charge. Accordingly, an atom with a neutral charge is one in which the atomic number is matched by the number of electrons.

Thus, an atom is said to be electrically neutral if it has an equal amount of protons and electrons. On the other hand, an atom is electrically charged if its protons and electrons are not distributed evenly.

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Answer:

J.J. Thomson

Explanation:

Molecular Orbital of Water is H2O

Each hydrogen atom has a 1s orbital. Two of the O(2sp3) hybrid orbitals and 2 of the H(1s) orbitals combine to make 2 sigma bonding and 2 sigma antibonding molecular orbitals.In H2O hybridization orbitals having the same energy level will combine to form hybrid orbitals.The water molecule has two lone pairs and two bond pairs. Each O‒H covalent bond is called a sigma (σ) bond.H2O has a tetrahedral arrangement of molecules or an angular geometry. This is mainly because the repulsion from the lone pair combination is more than bond-pair repulsion. Additionally, the existing pairs do not lie in the same plane. One pair is below the plane and the other one is above. This bond geometry is commonly known as a distorted tetrahedron.

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The balanced reaction that shows incomplete combustion is  2C4H10 + 5O2 → 4CO + 6H2O.

option D.

The balanced equation for incomplete combustion involves a reactant, usually a hydrocarbon fuel, reacting with a limited supply of oxygen to produce carbon monoxide (CO) instead of carbon dioxide (CO2) and water (H2O).

Out of the options given, the balanced equation that shows incomplete combustion is:

D. 2C4H10 + 5O2 → 4CO + 6H2O

This equation shows incomplete combustion because it produces carbon monoxide (CO) instead of carbon dioxide (CO2). The equation is balanced because there are equal numbers of atoms of each element on both the reactant and product sides of the equation.

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The heat changes are as follows:

A phase change is a process whereby matter changes from one physical state to another when heat is added or removed.

The processes of change of state are as follows:

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Answer:

An exothermic reaction

The reactivity of a substance with oxygen is a chemical, not a physical property. The reason it is called a chemical property is that it relies on its electron configuration to determine how it behaves around other substances.

A chemical property is a property of any material that becomes apparent during or after a chemical reaction; that is, any quality that can only be determined by changing the chemical properties of a substance.

Oxygen is a very reactive element, is highly paramagnetic and readily combines with other elements. One of the most important chemical properties of oxygen is that it promotes combustion. Even at room temperature, oxygen binds to elements and forms e.g. rust.

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The energy are there in one photon of orange light whose wavelength is 630nm is  \(3.15401\times10^{-19}\) Joules.

W=c/v, c=speed of light, v=frequency

\(6.3 \times 10^-7=3 \times 10^8/v\)

\(v=3 \times 10^8 / 6.3 \times 10^-7\)

\(v=4.76 X 10^14 Hz\)-frequency of the yellow light.

E=hv, h=Planck's constant,

\(E=(4.76 \times 10^14)Hz \times 6.62607×10^-34 J s\)

\(E=3.15401\times10^{-19}\) Joules- the energy of a single photon of yellow light.

Planck's constant or Planck's constant, is a fundamental physical constant of quantum mechanics. The constant gives the ratio of the energy of the photon to its frequency, and for mass-energy equivalent, the ratio of mass to frequency.

In quantum mechanics, energy is exchanged and absorbed in certain amounts called quanta. The Planck constant is a number that defines the amount of energy in these quantities and expresses how small things can be. Learn more about Planck's constant in this infographic.

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Explanation:

Abiotic factors such as rainfall, temperature, and soil conditions are the most responsible for the trend seen in the populations of large canopy trees and grass. Rainfall can affect the growth and survival of plants, and variations in temperature can influence the distribution of species. Soil conditions, such as nutrient levels and pH, can also play a role in determining which plants can thrive in a given area. Biotic factors, such as competition among plants and herbivory, can also influence the population trend of large canopy trees and grass, but these are typically driven by abiotic factors.

The trend seen in the populations of large canopy trees and grass is most likely due to abiotic factors, specifically changes in climate and temperature.

Large canopy trees typically require specific environmental conditions, such as adequate rainfall, humidity, and moderate temperatures, to thrive. As climate patterns shift and temperatures increase, these conditions may no longer be present in certain areas, which can result in a decline in the population of large canopy trees.

Similarly, grass populations are also influenced by changes in temperature and rainfall patterns. Grasses are adapted to grow in specific conditions, and as these conditions change, their populations can be impacted.

For example, prolonged drought conditions can lead to a decline in grass populations, while increased rainfall can promote growth.

While biotic factors such as competition between species and population dynamics can also influence the trend seen in the populations of large canopy trees and grass, abiotic factors are generally considered to be the primary drivers of these trends.

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Answer:

4+3=3+3+2

Explanation:

4Ni(oh)3+3pb(so4)2=3pb(oh)4+2Ni2(so4)3

Answer:

4. They are a renewable resource, they reproduce. any animal and plant has some form of reproducing. A couple ways they could become nonrenewable resources are if they are exterminated through disease, habitat destruction, introduction of a harmful species.

5. Generally the discussion of overconsumption parallels that of overpopulation; that is the more people, the more consumption of raw materials to sustain their live

6. Recycling uses less energy than making a new product from scratch – even when you take account of all the related costs, like transport and wages. Mining, quarrying, logging, processing and transporting raw materials to prepare them for use in industry takes a great deal of energy.