explain why the addition of 0.100 m naoh(aq) to 0.100 m hno2(aq) can result in the formation of a buffer solution. include the net ionic equation for the reaction that occurs when the student adds the naoh(aq) to the hno2(aq)

Answer:

Transition metals (Group C) have different numbers of valence electrons compared to the other groups mentioned. Therefore option C is correct.

Transition metals (Group 3-12) have varying numbers of valence electrons. This is because their valence electrons are located in more than one energy level or subshell.

The number of valence electrons for transition metals can range from 1 to 12, depending on the specific element within the group. The varying numbers of valence electrons in transition metals contribute to their diverse chemical properties and ability to form multiple oxidation states.

Therefore, transition metals (Group C) have different numbers of valence electrons compared to the other groups mentioned.

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Taking into account the definition of calorimetry, the final temperature of the mixed water is 48.91°C.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.

The equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the expression to calculate heat exchanges:

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

The heat that the hot water gives up will be equal to the heat that the cold water receives. Therefore:

- Qhot water= + Qcold water

- 4.184 J/g⁰C× 75 g× (Tfinal - 77.2°C)= 4.184 J/g⁰C× 100 g× (Tfinal - 27.7°C)

Solving:

- 313.8 J/⁰C× (Tfinal - 77.2°C)= 418.4 J/⁰C× (Tfinal - 27.7°C)

- 313.8 J/⁰C× Tfinal + 24,225.36 J= 418.4 J/⁰C× Tfinal - 11,589.68 J

24,225.36 J + 11,589.68 J= 418.4 J/⁰C× Tfinal + 313.8 J/⁰C× Tfinal

35,815.04 J= 732.2 J/⁰C× Tfinal

Tfinal= 35,815.04 J÷ 732.2 J/⁰C

Tfinal= 48.91 °C

Finally, the final temperature is 48.91°C.

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The equation that illustrates the relationship between wave velocity, frequency, and wavelength is: v = λ * f

v represents the wave velocity, which is the speed at which the wave travels through a medium. It is usually measured in meters per second (m/s).

λ (lambda) represents the wavelength of the wave, which is the distance between two consecutive points of similar phase on the wave. It is usually measured in meters (m).

f represents the frequency of the wave, which is the number of complete cycles or oscillations of the wave that occur in one second. It is usually measured in hertz (Hz).

The equation v = λ * f is known as the wave equation or the wave speed equation. It states that the wave velocity is equal to the product of the wavelength and the frequency of the wave.

This equation implies that as the frequency of a wave increases, the wavelength decreases, and vice versa, while keeping the wave velocity constant. In other words, if the frequency increases, the wave becomes more compressed and the distance between consecutive points of similar phase decreases.

On the other hand, if the frequency decreases, the wave becomes more spread out, and the distance between consecutive points of similar phase increases.

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Answer:

The mass percentage of water of crystallization in washing soda is 62.9 %. But the molar mass of Na2 CO3 • 10H2 O is 286.1412 g/mol and the Na2CO3 • 10H2O % by mass H2O.

SO your full answer is 286.1412 g/mol

Explanation:

plz brian list

Answer:

B Osmosis

Explanation:

Answer:

divide the mass of element in 1 mole of the compound by the compound's molar mass and multiply the answer by 100.

Explanation:

take the molar mass of hydrogen in the water molecule, divide by the total molar mass of water, and multiply by 100.

does it help?

Answer:

volume is the amount of space in a certain object

The strength of the sulfur-oxygen bond generally depends on the number of oxygen atoms surrounding the sulfur atom and the overall charge of the ion.

(1) SO2: This molecule has a double bond between sulfur and one oxygen atom, resulting in a relatively strong bond.

(2) SO3: This molecule has a trigonal planar structure with three oxygen atoms bonded to the sulfur atom. Each sulfur-oxygen bond in SO3 is a double bond, making them stronger than in SO2.

(3) SO32–: This ion, known as sulfite, has a trigonal pyramidal structure with three oxygen atoms bonded to the sulfur atom and one additional lone pair of electrons. The sulfur-oxygen bonds in sulfite are weaker than in SO3 because the negative charge on the ion leads to greater repulsion and weakening of the bonds.

(4) SO42–: This ion, known as sulfate, has a tetrahedral structure with four oxygen atoms bonded to the sulfur atom. Each sulfur-oxygen bond in sulfate is a double bond, making them stronger than in sulfite.

Therefore, based on the provided options, the weakest sulfur-oxygen bond would be found in (3) SO32– (sulfite) due to the additional negative charge and repulsion present in the ion.

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In this instance, the temperature of 20.0g of nickel has dropped by 40 degrees Celsius.

The term "specific heat capacity" refers to the amount of heat energy required to raise a substance's temperature per unit of mass..  A material's capacity to store heat energy is determined by this physical attribute. Typically, definition  is used to determine a substance's specific heat capacity.

We need to know the mass and specific heat capacity of the substance, as well as the temperature change, in order to calculate the heat emitted when a substance cools down.

Calculating the heat released follows this formula:

q = m * c * ΔT

where T is the change in temperature (in degrees Celsius), q is the amount of heat released (in joules), m is the substance's mass (in grammes), and c is its specific heat capacity (in joules per gramme per degree Celsius).

In this instance, the temperature of 20.0g of nickel has dropped by 40 degrees Celsius.

To determine how much heat was emitted, we need to know the specific heat capacity of nickel.

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Answer:

1 mole of any material contains 6.023×1023 elementary particles. Hence, by ratio and proportion, 5.61mol of diatomic hydrogen gas contains 5.61×6.023×1023 hydrogen molecules =3.3789×1024 H2 molecules.

Explanation:

The activation energy for the reaction is 81.5 kJ/mol. To calculate the activation energy of the reaction, we can use the Arrhenius equation, which relates the rate constant (k) to the activation energy (Ea), temperature (T), and the pre-exponential factor (A).

The equation is given by: k = A*e^(-Ea/RT), where R is the gas constant.

Let's assume that the pre-exponential factor is constant and cancel it out. We know that the rate of the reaction doubles when the temperature increases by 20°C above room temperature, so we can use the ratio of the rate constants to find the activation energy. The ratio of the rate constants is given by: k2/k1 = e^(-Ea/R * (1/T2 - 1/T1))

Substituting the given values, we get: 2/1 = e^(-Ea/R * (1/(25+20+273) - 1/298))

Solving for Ea, we get: Ea = -R * ln(2) / (1/(25+20+273) - 1/298) = 81.5 kJ/mol.

Therefore, the activation energy for the reaction is 81.5 kJ/mol.

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Answer:

we needa see the equations

Approximately 3.99 grams of lead (II) oxide will be produced by the decomposition of 6.25 grams of lead (II) carbonate.

The balanced chemical equation for the decomposition of lead (II) carbonate is as follows:

PbCO3(s) -> PbO(s) + CO2(g)

From the equation, we can see that one mole of lead (II) carbonate decomposes to yield one mole of lead (II) oxide.

To determine the number of moles of lead (II) carbonate, we need to calculate its molar mass. The molar mass of lead (II) carbonate (PbCO3) can be calculated as follows:

Molar mass of PbCO3 = Atomic mass of Pb + Atomic mass of C + (3 x Atomic mass of O)

= (207.2 g/mol) + (12.01 g/mol) + (3 x 16.00 g/mol)

= 207.2 g/mol + 12.01 g/mol + 48.00 g/mol

= 267.21 g/mol

Now, we can calculate the number of moles of lead (II) carbonate using its given mass:

Number of moles of PbCO3 = Mass of PbCO3 / Molar mass of PbCO3

= 6.25 g / 267.21 g/mol

≈ 0.0234 mol

Since the stoichiometry of the balanced equation tells us that 1 mole of PbCO3 produces 1 mole of PbO, the number of moles of PbO produced will also be 0.0234 mol.

Finally, we can calculate the mass of lead (II) oxide (PbO) produced using its molar mass:

Mass of PbO = Number of moles of PbO x Molar mass of PbO

= 0.0234 mol x (207.2 g/mol)

≈ 4.84 g

Therefore, approximately 3.99 grams of lead (II) oxide will be produced by the decomposition of 6.25 grams of lead (II) carbonate.

By decomposing 6.25 grams of lead (II) carbonate, approximately 3.99 grams of lead (II) oxide will be produced. This calculation is based on the balanced chemical equation and the molar masses of the compounds involved.

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The aspects of thermodynamics the enzyme can not change are alter the overall energy balance of a chemical reaction and overall direction of a reaction

Firstly, enzymes cannot alter the overall energy balance of a chemical reaction, the first law of thermodynamics states that energy cannot be created or destroyed, only converted from one form to another. Enzymes can speed up reactions by lowering the activation energy, but they cannot change the total energy input or output.

Secondly, enzymes cannot change the overall direction of a reaction, as dictated by the second law of thermodynamics, this law states that natural processes tend to increase the entropy (disorder) of the system. If a reaction is not thermodynamically favorable (i.e., it would result in a decrease in entropy), enzymes cannot make it occur spontaneously. They can only increase the reaction rate if the reaction is already favorable. In summary, enzymes can speed up the reaction rate and lower activation energy, but they cannot change the total energy balance or the overall direction of a reaction, as these are determined by the laws of thermodynamics.

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Answer: When a mixture of carbon and water is filtered, the residue is the undissolved solid: carbon. Filtering is a process used to separate solid particles from a liquid by passing the mixture through a filter. The solid particles are retained on the filter, while the liquid passes through. In this case, the solid particles are the carbon, and the liquid is the water.

Therefore, the correct answer is: The UNDISSOLVED SOLID: carbon.

When a mixture of carbon and water is filtered, the undissolved solid carbon residue obtained. Therefore, option A is correct.

The term filtration is defined as the process in which solid particles in a liquid or gaseous fluid are extracted by the use of a filter medium that permits the liquid to transfer through but retains the solid particles.

When a mixture of carbon and water are filtered, the residue obtained is the undissolved solid carbon. Filtering is a process used to separate solid particles from a liquid by transferring the mixture through a filter.

The solid particles are remain on the filter paper, while the liquid passes through it. In this case, the solid particles are the carbon, and the liquid is the water.

Thus, option A is correct.

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1. The formula weight of alum, KAl(SO₄)₂-12 H₂O, according to an online MSDS source, is 474.39 g/mol to three significant figures.

2. The percent yield of a 0.4754 g sample of aluminum reacts according to our experiment to produce alum 5.3287 g of dried alum crystals are recovered is 63.04.

To calculate the percent yield of the experiment, we need to use the formula:

Percent Yield = (Actual Yield / Theoretical Yield) x 100%

The theoretical yield is the amount of alum that should have been produced based on the amount of aluminum used. We can calculate the theoretical yield using stoichiometry:

2 Al + K₂SO₄ + 4 H₂SO₄ + 24 H₂O → KAl(SO₄)₂-12 H₂O + 3 H₂

From this equation, we can see that 1 mole of Al produces 1 mole of alum. Therefore, the theoretical yield of alum is:

Theoretical Yield = (0.4754 g Al) / (26.98 g/mol Al) x (1 mol Al / 1 mol alum) x (474.39 g/mol alum)

= 8.449 g

Now we can use the formula above to calculate the percent yield:

Percent Yield = (Actual Yield / Theoretical Yield) x 100%

= (5.3287 g / 8.449 g) x 100%

= 63.04%

Therefore, the percent yield of the experiment is 63.04%.

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The correct answer is Observation. An observation is a statement that is backed by evidence from the senses, which leads to knowledge.(option C)

It is a fundamental part of the scientific method, as it allows researchers to investigate and gather information about the natural world. In the given situation, there is more traffic between 8 and 9 in the morning because most people start work at 9. This is an observation, which is backed by the evidence from the traffic data that shows that the number of cars on the road increases between 8 and 9 in the morning. The observation is not a hypothesis, as it does not provide a potential explanation for why more traffic occurs between 8 and 9 in the morning. Similarly, the observation is not a theory, as a theory is a well-tested explanation of a natural phenomenon that is based on a significant amount of data. An experiment is a test that is designed to investigate a specific hypothesis, which is not applicable in this situation. Therefore, the correct answer is C) Observation.(option C)

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The statement indicating higher traffic between 8-9 AM due to people starting work at 9 is termed as a hypothesis. Hypothesis refers to a potential explanation based on limited evidence which needs to be further investigated. This hypothesis could be tested by analyzing traffic flow and people's work start times.

The correct option is d.

The statement 'There is more traffic between 8 and 9 in the morning because most people start work at 9' falls under the category of a D) hypothesis. The term 'hypothesis' is used to denote an explanation that is based on limited evidence, which serves as a starting point for further investigation.

In this case, the hypothesis is that the heavier traffic during 8-9 AM is due to most people starting their work at 9. This hypothesis can be further investigated and tested by collecting and analyzing appropriate data such as traffic flow during different hours and work start times for different people.

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Phosphorus-32, a radioisotope used in the treatment of leukemia, has a half-life of 14.3 days. if a sample contains 40.0 mg of phosphorus-32, 5 milligrams of phosphorus-32 remain after 42.9 days.

The half-life of phosphorus-32 is 14.3 days, which means that after 14.3 days, half of the original amount of phosphorus-32 will remain. After another 14.3 days, half of the remaining amount will remain, and so on.

After 42.9 days, the sample will have undergone 3 half-lives, so 3/2 = 1/2^3 = 1/8 of the original amount of phosphorus-32 will remain.

The original amount of phosphorus-32 was 40.0 mg, so after 42.9 days, 40.0 mg * 1/8 = <<40*1/8=5>>5 mg of phosphorus-32 will remain.

Therefore, the answer is 5 mg.

Any of the several species of the same chemical element with various masses, unstable nuclei, and spontaneous production of radiation in the form of gamma, beta, and alpha rays. Radioisotopes, radionuclides, and radioactive nuclides are other names for radioactive isotopes. Each chemical element has one or more radioactive isotopes. For instance, hydrogen, the lightest element, has three isotopes, each with a mass of 1, 2, and 3. The other two hydrogen isotopes are stable, while only hydrogen-3 (tritium) is radioactive. Radioactive isotopes can be used for a variety of purposes. For instance, cobalt-60 is frequently employed in medicine as a radiation source to prevent the spread of cancer. Other radioactive isotopes are employed as tracers for diagnostic purposes and in investigations on metabolic processes.

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Josef Loschmidt and Amedeo Avogadro were both scientists who made significant contributions to the understanding of basic molecular numbers, sizes, and reaction ratios.

In 1811, Amedeo Avogadro proposed that equal volumes of gases at the same temperature and pressure contain the same number of molecules. This became known as Avogadro's law, which laid the foundation for the concept of the mole.

Josef Loschmidt, on the other hand, made important contributions to determining the size of molecules. In 1865, Loschmidt used kinetic theory to calculate the number of molecules in one cubic centimeter of gas at standard temperature and pressure (STP). He estimated the number to be about 2.7 x 10¹⁹, which is close to the modern value of Avogadro's number.

The term "Avogadro's number" was not coined until the early 1900s, long after Avogadro's death. The name was proposed by French physicist Jean Baptiste Perrin in honor of Avogadro's contributions to the concept of the mole.

In my opinion, the name "Avogadro's number" is appropriate because Avogadro's law was the first concept to establish a relationship between the volume of a gas and the number of molecules it contains. Moreover, Avogadro's law played a crucial role in the development of the mole concept, which is essential in chemical calculations. While Loschmidt's contributions were also significant, he did not propose a fundamental law like Avogadro did. Therefore, I believe that naming the number after Avogadro is appropriate to recognize his contributions to this fundamental concept in chemistry.

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The difference in absorption between ti(h2o)6 3 and tif6 3 is due to the different electronic configurations and molecular geometries of the two complexes.                                                                                                                                        

The absorption of light by a complex is related to the energy required to promote an electron from a ground state orbital to an excited state orbital.In ti(h2o)6 3, the titanium atom is surrounded by water ligands which create a high spin d2 configuration. In tif6 3, the titanium atom is surrounded by fluoride ligands which create a low spin d1 configuration.
This phenomenon occurs because the energy required for electronic transitions in TiF6 3- is lower than in Ti(H2O)6 3+, resulting in the observed difference in light absorption.

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Answer:

Changing the concentration of one solution in the cell will increase the voltage potential of the cell because you are putting the system further out of equilibrium. Because the concentration in only one side of the cell has changed, the concentration gradient across both sides of the cell becomes steeper. In order for this experiment to work, the salt bridge must be concentrated enough to effectively separate the two electrolyte solutions, but it must also be porous enough to allow ionic flow.

Explanation:

think so you like it

Answer:

0.96 mol AG

Explanation:

To see the number of atoms of an element, we need to multiply stoichiometry of that molecule to the number that is written on the foot of element. Thus the balanced reaction is

\(\rm Mg+2AgNO_{3}\rightarrow Mg(NO_{3})_{2}+2Ag\)

And the mole of silver produced from  0.480 mol is  0.96 mol    

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side.

The unbalanced equation is

\(\rm Mg+AgNO_{3}\rightarrow Mg(NO_{3})_{2}+Ag\)

Magnesium atoms on reactant and product side is 1.

Nitrogen atoms on reactant side is 1 and on product side it is 2 so, multiply \(AgNO_{3}\) by 2, now the reaction becomes

\(\rm Mg+2AgNO_{3}\rightarrow Mg(NO_{3})_{2}+Ag\)

Silver atom on reactant side is 2 while on product side it is 1 so, multiply Ag by 2, now the balanced equation is

\(\rm Mg+2AgNO_{3}\rightarrow Mg(NO_{3})_{2}+2Ag\)

The mole ratio of Mg to silver is 1:2

1mole of Mg produce=2 mole of Silver

0.480 mol of magnesium produce= 2×0.480=0.96 mol fo silver

Thus the balanced reaction is

\(\rm Mg+2AgNO_{3}\rightarrow Mg(NO_{3})_{2}+2Ag\)

And the mole of silver produced from  0.480 mol is  0.96 mol        

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Answer:

Refer to the picture.

Answer:

its atomic weight

Explanation:

The root growth is related to gravity as as negative geotropic and positive geotropic with regards to gravity on the roots.

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Deciding whether or not to approve a mortgage Future changes in consumer purchase tendencies can be predicted using classification models.

A mortgage is a kind of loan used to buy or keep up real estate, such as a home, piece of land, or other construction. The borrower agrees to make a series of monthly payments, divided into principal and interest, to the mortgage lender. This frequently emerges as a succession of regular, weekly episodes. After then, the asset is forfeited as loan collateral.

Borrowers are need to fill out an application with their selected lender and fulfill a number of criteria, such as down payments and minimum credit scores. Before going on to the closing stage, mortgage applications must pass a stringent underwriting procedure.

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Answer:

The pressure is = 897 torr

Explanation: