An atom has a mass number of 43 and it also has 21 electrons. how many protons does this atom have? assume the atom is neutral.

Answer:

The volume of the gas will be 814 mL.

Explanation:

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature and moles.

Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is kept at a constant pressure, by means of a constant of proportionality that is applied directly. For a given sum of gas at a constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases because the temperature is directly related to the energy of the movement of the gas molecules. .

In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:  

\(\frac{V}{T} =k\)

It is desired to study two different states, an initial state and an final state. You have a gas that is at a volume V1 and at a temperature T1 at the beginning of the experiment. When the temperature varies to a new T2 value, then the volume will change to V2, and the following will be true:

\(\frac{V1}{T1} =\frac{V2}{T2}\)

In this case:

Replacing:

\(\frac{752 mL}{298 K} =\frac{V2}{323 K}\)

Solving:

\(V2= 323 K*\frac{752 mL}{298 K}\)

V2= 815 mL

The volume of the gas will be 814 mL.

Adding salt to acidic water increases its electrical conductivity due to the dissociation of ions.

The presence of ions allows the water to conduct electricity more effectively, leading to the observed change in conductivity.

When salt is added to acidic water, it dissociates into positive and negative ions (such as sodium cations and chloride anions). These ions increase the number of charged particles in the water, enabling it to conduct electricity more efficiently.

This enhanced electrical conductivity is a consequence of the increased presence of mobile ions, which leads to the observed change in the water's conductivity.

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The solubility of cubr(s) in distilled water is measured by  adding excess CuBr(s) to distilled water and stir the mixture until no more CuBr(s) dissolves.

The solubility of cubr(s) in an nabr(aq) solution is by adding excess CuBr(s) to a known concentration of NaBr(aq) solution and stir the mixture until no more CuBr(s) dissolves.

To measure the solubility of CuBr(s) in each solution, we need to prepare a saturated solution of CuBr(s) in each solution and determine the concentration of \(Cu^{2+}\) and \(Br^-\) ions in each solution. The solubility of CuBr(s) will be equal to the product of the concentrations of \(Cu^{2+}\) and \(Br^-\) ions.

To prepare a saturated solution of CuBr(s) in distilled water, we can add excess CuBr(s) to distilled water and stir the mixture until no more CuBr(s) dissolves. We can then filter the solution to remove any undissolved CuBr(s) and measure the concentration of \(Cu^{2+}\) and \(Br^-\) ions using suitable analytical techniques such as atomic absorption spectroscopy or ion chromatography.

To prepare a saturated solution of CuBr(s) in an NaBr(aq) solution, we can add excess CuBr(s) to a known concentration of NaBr(aq) solution and stir the mixture until no more CuBr(s) dissolves. We can then filter the solution to remove any undissolved CuBr(s) and measure the concentration of \(Cu^{2+}\) and \(Br^-\) ions using suitable analytical techniques.

To prepare a saturated solution of CuBr(s) in an \(NaNO_3(aq)\) solution or a \(Cu(NO_3)^2(aq)\) solution, we can follow the same procedure as for the NaBr(aq) solution, replacing the NaBr(aq) solution with the \(NaNO_3(aq)\) solution or the \(Cu(NO_3)^2(aq)\) solution.

Once we have determined the concentrations of \(Cu^{2+}\) and \(Br^-\) ions in each solution, we can calculate the solubility of CuBr(s) in each solution using the formula:

\(solubility = [Cu^{(2+)}][Br^-]\)

where\([Cu^{2+}]\)is the concentration of \(Cu^{2+\) ions and\([Br^-]\)is the concentration of\(Br^-\) ions in the saturated solution.

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Answer:

72.14878 grams

Explanation:

Answer:

1) 3Fe + 2O(2, this is the subscript) - Fe(3)O(4)

2) 2Sr + O(2) - 2SrO

3) Sn + 2NaOH - Na(2)SnO(2) + H(2)

4) 2K + Br(2) -2KBr

5) 2C(8)H(18) + 25O(2) - 16CO(2) + 18H(2)O

Answer:

your carbon footprint is how often you use a car of vehical you can decreese it by riding a bike or walking.

Explanation:

Carbon footprint is like when you ride a car and it produces lots of carbon monoxide in the air. Ways to reduce it is by walking, riding a bicycle or using the bus for transportation. Hope this helps.

Answer:

1) line graph

2) temperature

3) 260 to 330

Explanation:

Edge 2020

Answer: 50-70

Explanation:

Got it right on edge 2020

To have a compound with the formula C4H11N, we can consider the possible isomers with a 2o amine and a 3o carbon atom.

A 2o amine has two alkyl groups and one hydrogen atom attached to the nitrogen atom, while a 3o carbon atom has three alkyl groups attached to the carbon atom. For a compound to contain both a 2o amine and a 3o carbon atom, there must be one nitrogen atom and one carbon atom in the molecule with the specified bonding pattern. The remaining two carbon atoms can be arranged in different ways.

The possible isomers are:

N,N-dimethyl-2-butamine

N,N-diethyl-2-methylpropanamine

Therefore, there are two compounds with the formula C4H11N that contain a 2o amine and a 3o carbon atom.

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The mass of 4 atoms of c is less than the mass of 3 atoms of element d then the c element has more atoms/gram

Mass is a measure of the amount of matter in a substance or an object

Here given data is

4 atom of c

3 atom of d

We have to calculate element has more atoms/gram = ?

So 4 atom of c < 3 atom of d

So the so c has larger molar mass so c ahs the more atom/gram

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1. I noticed that the soil particles settled out of the water with the larger, heavier particles settling out first and on the bottom, and each layer has smaller and lighter particles in it.

2. Sand settled on the bottom because they are heavier and have more mass than the smaller particles such as silt and clay.

3. Yes, this is a good way to determine particle size distribution. The method used in the experiment allows for the separation of soil particles based on their size and weight, which is a good indicator of their distribution in the soil sample.

4. The results in this experiment may look different when done in different locations because the particle size distribution of soil can vary depending on the location, climate, and geology of the area. Soils in different locations may have different compositions, including different amounts of sand, silt, and clay, which can affect the results of the experiment. Additionally, the sedimentation rate of the particles can also be influenced by factors such as the temperature, the presence of organic matter, and the presence of clay minerals, which can further affect the results.

Answer: Chlorine I think

Explanation:

Chlorine is added to the water to kill germs. When it is added to a swimming pool, it forms a weak acid called hypochlorous acid that kills bacteria like salmonella and E.

Answer: Chlorine!

Explanation:

When it is added to a swimming pool, it forms a weak acid called hypochlorous acid that kills bacteria like salmonella and E. coli, as well as germs that cause viruses such as diarrhea and swimmer's ear.

The arrangement of an atom's or molecule's electrons in atomic or molecular orbitals is known as the electron configuration in atomic physics and quantum chemistry.

One orbital can house a maximum of two electrons, and there are four different types of orbitals (s, p, d, and f). More electrons can be held in the p, d, and f orbitals since they contain various sublevels. Each element's position on the periodic table determines the specific electron configuration of that element. The arrangement of an atom's or molecule's electrons in atomic or molecular orbitals is known as the electron configuration in atomic physics and quantum chemistry.

A standardized notation is used for expressing electron configurations, in which the energy level and type of orbital are written first, followed by the number of electrons in the orbital, which is expressed in superscript. For instance, carbon's (atomic number: 6) electronic configuration is 1s22s22p2.

Hence. The elements are denoted by the  electron configurations are,

1) Beryllium

2) Boron

3) Magnesium

4) Silicon

5) Phosphorus

6) Calcium

7) Nickel

8) Krypton

9) Bromine

10) Strontium

The complete question is,

Determine the elements denoted by the following electron configurations.​

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Answer:

the equilibrium of the system will be upset.

Explanation:

a p e x

The plant’s production of carbohydrates stops producing high-energy sugars altogether.

When carbon dioxide is completely removed from a plant's environment it is expected that the plant will stop producing energy-rich sugars altogether.CO2 is required for plants to photosynthesize. So without CO2, plants have no way to make energy. In this scenario, it will probably wither.

Carbon dioxide is an important greenhouse gas and helps trap heat in the atmosphere. Without them, our planet would be uninhabitable and cold. Plant photosynthesis produces oxygen and carbohydrates in a strict ratio, so we run out of oxygen as soon as we eat. But lethal levels of carbon dioxide will be reached long before these things happen.

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Without knowing the specific pKa values of the amino acid's functional groups, it is not possible to determine the exact magnitude of the net charge at pH 7.2.

If the pH of the solution is higher than the pI, the amino acid will have a net negative charge. If the pH is lower than the pI, the amino acid will have a net positive charge. At the pI, the amino acid is electrically neutral.

In this case, the pH of the solution (pH 7.2) is higher than the pI (6.2) of the amino acid. Therefore, the amino acid will have a net negative charge in this solution.

The further away the pH is from the pI, the stronger the net charge of the amino acid will be.

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Answer:    Atmosphere - Atmosphere - Troposphere: The lowest portion of the atmosphere is the troposphere, a layer where temperature generally decreases with height. This layer contains most of Earth’s clouds and is the location where weather primarily occurs. The lower levels of the troposphere are usually strongly influenced by Earth’s surface.

Explanation:

The mass of the tin sample has been 95.682 g.

The specific heat has been given as the amount of heat required to raise the temperature of 1 gram of substance by 1 degree Celsius.

The heat required has been expressed as:

\(\rm Heat=mass\;\times\;specific\;heat\;\times\;\Delta T\)

The heat required by tin sample has been given, 543 J

The specific heat of tin has been, \(c_p=0.227\;\rm J/g^\circ C\)

The change in temperature (\(\Delta T\)) has been given as:

\(\Delta T=\text{Final\;temeprature-Initial temperature}\\\Delta T=\rm -10^\circ C-15^\circ C\\\Delta \textit T=-25^\circ C\)

Substituting the values for the mass of tin

\(\rm 543\;J=Mass\;\times\;0.227\;J/g^\circ C\;\times\;-25^\circ C\\543\;J=Mass\;\times\;5.675\;J/g\\Mass=95.682\;g\)

The mass of the tin sample has been 95.682 g.

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Answer:

C permit flow in only one direction

Answer:

30.026 g/mol

Explanation:

no explaination

In 0.75 moles of caffeine, there are a total of 6 carbon atoms, 7.5 hydrogen atoms, 3 nitrogen atoms, and 1.5 oxygen atoms.

To determine the total number of atoms in 0.75 moles of caffeine, we need to consider the molecular formula of caffeine, which is C8H10N4O2. The molecular formula provides the ratios of each element present in the compound. By multiplying the number of atoms in each element by the corresponding coefficient in the molecular formula, we can calculate the total number of atoms. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms in each molecule of caffeine. Multiplying these values by 0.75 moles will give us the total number of atoms in 0.75 moles of caffeine.

The molecular formula of caffeine, C8H10N4O2, provides the number of atoms for each element present in one molecule of caffeine. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms.

To calculate the total number of atoms in 0.75 moles of caffeine, we need to multiply the number of atoms for each element by the coefficient in the molecular formula, and then multiply that by the number of moles (0.75 moles).

For carbon (C): 8 atoms x 0.75 moles = 6 atoms (since there are 8 carbon atoms in one molecule of caffeine).

For hydrogen (H): 10 atoms x 0.75 moles = 7.5 atoms (since there are 10 hydrogen atoms in one molecule of caffeine).

For nitrogen (N): 4 atoms x 0.75 moles = 3 atoms (since there are 4 nitrogen atoms in one molecule of caffeine).

For oxygen (O): 2 atoms x 0.75 moles = 1.5 atoms (since there are 2 oxygen atoms in one molecule of caffeine).

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Answer:

NO2

Explanation:

N = Nitrogen

O = Oxygen

Answer:

NO. 2.

is the answer

hopes this helps

Answer:

Both are caused by changes in heat energy

Explanation:

When air gets hotter water will evaporate, when air gets cooler water will condensate.

The pH of blood if pco2 drops to 35.0 mmhg is 7.459

The pH of the blood can be calculated using the Henderson- Hasselbalch equation, it explains the relation between acid dissociation constant pKa and pH in biological and chemical systems.

pH = pK + log ( HCO3- / ( 0.03 * PCO2 ) )

pK is 6.1 for bicarbonate buffer system.

HCO3- = 24mm

PCO2  = 35.0 mmhg

pH = 6.1 + log ( 24 / 0.03 * 35.0 )

     = 6.1 + log ( 24 / 1.05 )

     = 6.1 + log 22.8571

     = 6.1 + 1.3590

     = 7.459

Hence, the pH of blood is 7.459

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The electron-pushing mechanism for the decarboxylation reaction involves the addition of three curved arrows. The reaction starts with a carboxylic acid, which undergoes a proton transfer to form a carboxylate anion. The carboxylate anion then experiences nucleophilic attack by a base, leading to the formation of a cyclic intermediate. The cyclic intermediate undergoes ring opening, resulting in the expulsion of carbon dioxide and the formation of a new bond. The electron-pushing mechanism helps illustrate the movement of electrons throughout the reaction, highlighting the formation and breaking of bonds.

In the decarboxylation reaction, we start with a carboxylic acid, which is represented by the structure: C(O)OH. The first step involves the proton transfer, where a curved arrow is drawn from one of the lone pairs on the oxygen of the carboxylic acid to the hydrogen atom attached to the same oxygen. This proton transfer leads to the formation of a carboxylate anion, depicted as C(O)O-.

The second step involves nucleophilic attack by a base. Draw a curved arrow from the lone pair on the oxygen of the carboxylate anion to the carbon atom adjacent to the carbonyl group. This movement of electrons results in the formation of a cyclic intermediate. The cyclic intermediate is represented by a ring structure formed by the interaction between the carbon atom and the oxygen atom of the carboxylate group.

The third step involves ring opening. Draw a curved arrow from the carbon atom of the cyclic intermediate to the oxygen atom of the carboxylate group. This movement of electrons breaks the bond between the carbon atom and the oxygen atom, resulting in the expulsion of carbon dioxide (CO2). Simultaneously, a new bond is formed between the carbon atom and the neighboring atom (not specified in the given question).

The overall reaction can be summarized as the decarboxylation of a carboxylic acid, leading to the removal of a carbon dioxide molecule and the formation of a new bond. The electron-pushing mechanism helps visualize the flow of electrons during the reaction, highlighting the formation and breaking of bonds at each step.

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The ratio of buffer C₂H₃O₂ /HC₂H₃O₂  must you use are1:0.199 or 10:2

the ratio of buffer C₂H₃O₂ /HC₂H₃O₂  can be calculate using the Henderson-Hasselbalch Equation which relates the pH to the measure of acidity pKa. The equation is given as:

pH = pKa + log ([base]/[acid]

Where,

[base] = concentration of C₂H₃O₂in molarity or moles

[acid] = concentration of HC₂H₃O₂ in molarity or moles

For the sake of easy calculation, allow us to assume that:

[base] =1

[acid] = x

Therefore using equation 1,

5.44 = 4.74 + log (1 / x)

log [base / acid] = 0.7

1 / x = 5.0118

x = 0.199

The required ratio of buffer C₂H₃O₂ /HC₂H₃O₂ is 1:0.199 or 10:2

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Combustion analysis of fluorene, a polycyclic aromatic hydrocarbon used to make dyes, plastics, and pesticides, produces 11.44 g CO2 and 1.80 g H2O. The empirical formula of fluorene C₆H₄.

CₓHₐ + O2 → CO2 + H2O Since the combustion is complete, so the total mass of the reactants is equal to the total mass of the reactants Therefore, Mass of O2 = (17.9 + 9.14) – 5.9 = 21.14 grams Here, the empirical formula for the hydrocarbon is CₓHₐ. So, now we have to need to determine the number of moles of the O2, CO2, and H2O :- Mole of CO2 = 17.9/44 = 0.4068 Mole of H2O = 9.14/18 = 0.5078 Mole of O2 = 21.14/32 = 0.6606. The empirical formula for the compound containing uranium and fluorine is UF6. Explanation: The empirical formula of a compound represents the lowest whole number ratio of elements in the compound. This ratio is represented by subscripts in the formula. by this information, we can consider that combustion analysis of fluorene, a polycyclic aromatic hydrocarbon used to make dyes, plastics, and pesticides, produces 11.44 g CO2 and 1.80 g H2O. The empirical formula of fluorene C₆H₄.

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Answer:B

Explanation:

If all of this gas is burned, 1627.13 grams of water vapor is produced.

The balanced chemical equation for the combustion of hydrogen gas in air to produce water vapor is:

2H2 + O2 → 2H2O

From this equation, we can see that 2 moles of hydrogen gas (H2) react with 1 mole of oxygen gas (O2) to produce 2 moles of water vapor (H2O).

To determine the mass of water vapor produced, we need to use the ideal gas law to calculate the number of moles of hydrogen gas present in the fuel tank:

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. Rearranging this equation to solve for n, we get:

n = PV/RT

Substituting the given values, we have:

n = (20.0 atm)(150.0 L)/(0.0821 L·atm/mol·K)(298 K)

n = 90.57 mol

So, there are 90.57 moles of hydrogen gas in the fuel tank. Since 2 moles of hydrogen gas react with 1 mole of oxygen gas to produce 2 moles of water vapor, we need half as many moles of oxygen gas as hydrogen gas. Therefore, we need:

(1/2)(90.57 mol) = 45.28 mol of O2

The molar mass of water (H2O) is 18.02 g/mol, so the mass of water produced is:

(2 mol H2O/2 mol H2) (18.02 g/mol) (90.57 mol H2)

= 1627.13 g

Rounding to two decimal places, we get:

1627.13 g → 1627.13 g

or approximately 1627.13 grams of water vapor produced.

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Answer:

216 K

Explanation:

T2=T1P2/P1

Change C to K

The final temperature of the gas is approximately 40.96 Kelvin.

To determine the final temperature of the gas, we can use the ideal gas law, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature in Kelvin.

First, let's convert the given temperatures to Kelvin. We have:

Initial temperature: -125 degrees Celsius = 148 K (approximate)

Final temperature: Unknown

The initial conditions of the gas are as follows:

Initial pressure (P1) = 1.25 atm

Initial volume (V1) = 1250 mL = 1.25 L (since 1 L = 1000 mL)

Initial temperature (T1) = 148 K

The final conditions of the gas are as follows:

Final pressure (P2) = 50.0 atm

Final volume (V2) = 325 mL = 0.325 L

Final temperature (T2) = Unknown

Using the ideal gas law, we can set up the following equation:

(P1 * V1) / T1 = (P2 * V2) / T2

Substituting the known values:

(1.25 atm * 1.25 L) / 148 K = (50.0 atm * 0.325 L) / T2

Simplifying the equation:

T2 = (50.0 atm * 0.325 L * 148 K) / (1.25 atm * 1.25 L)

T2 = 40.96 K

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