how much lead paint contains 14.5% pbcr2o7 and 73% of the paint evaporates as it dries what mass of lead wil be in a paint chip that weighs 0.15g

The sequence of events that resulted in the end of reconstruction include:

The Reconstruction era was a period in American history  following the American Civil War (1861–1865) and lasting until approximately the Compromise of 1877—when the last federal troops were withdrawn from the South—where attempts were made to deal with the problems of readmitting the eleven states that had seceded from the Union and fought against it in the Civil War, and to redress the political, social, and economic legacies of slavery.

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Xenon a noble gas shows the greatest deviation from the ideal gas law at high pressures.

Real gases behave very differently from ideal gases at high pressures or low temperatures. It's useful to be aware that the ideal gas law considers the size of gas molecules to be minimal or nonexistent.

Due to its size and the fact that it is the largest of the group, Xe is predicted to deviate from the ideal gas the most under conditions of high pressure or low temperature.

Van der Waal forces come into play as gaseous atoms or molecules grow closer to one another under high pressure and low temperature. As a result, atoms or molecules begin to attract one another. As a result, gas behaves the furthest from its ideal state. While in an ideal world there would be no intermolecular forces of attraction, we can assume that gases do not attract one another.

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30 ml of hydrogen gas are produced.

The ideal gas law is also known as the general gas equation, is the equation of state for a hypothetical ideal gas. It may have some limitations, but is a good approximation of the behavior of many gases under many conditions. It is expressed as PV = nRT

The reaction is expressed as:

2Al + 6HCl ⇒ 2AlCl₃ + 3H₂

The ratio of Al and H₂ is 2:3

Moles of aluminium = 0.057 /26.98

= 0.0021 moles

The mole ratio indicates that,

The number of moles of H₂ = 0.0021 × 2/3

= 0.0014 moles

Using PV = nRT

where,

T = 273 K

P = 1 atm

R = 0.0821 Kj /mol K

n = 0.0014 moles

Substitute the values in equation which gives,

V = nRT/P

V = 0.0014×0.0821×273/1

V = 0.03 L or 30 ml

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Ch3ho has a concentration (m) of 1.589 mol/dm3 in a solution.

Given our parameters, 230 ml per liter of solution and a mole of solutes equal?

that: mass/molar mass = moles of solutes

mass = 11.7g.

thus the formula for CH3OH's molar mass is C(12)+H(1*3) +O(16)+1 =32g.

11.7g/32g Equals 0.365 moles of solutes.

Great, now that we have the moles, we can now enjoy the molarity (concentration)

Molarity is equal to 0.365mol/230*10-3, which is 0.365mol/0.230L, or 1.589mol/dm3.

The formula for calculating molarity is molarity = number of moles of solute. litres of the solution. Since the volume of the solution will be measured in litres and the quantity of moles of solute is measured in mol. So, mol L – 1 is the unit of molarity.

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The unknown volume of 8.61 M H2SO4 solution after adding water to make 5.00*102ml of 1.75m H2SO4 was 102 ml, or 1.02 × 102 ml.

1.02x10^2 ml The product of molarity and volume will remain constant as mole solvent is added since molarity is defined as moles per liter. In order to describe this, let's build up an equality: m0*v0 = m1*v1, where m0, v0 are the molarity and volume of the original solution and m1, m1 are those of the final solution.

Calculate by first solving for v0, then substituting the known values: m0*v0 = m1*v1, where v0 = (1.75 M * 500 ml)/8.61 M and V0 = 101.6260163. The result of rounding to three significant figures is 102 ml.

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The solvent will flow to the top of the TLC plate and the chemicals identified on the silica plate will travel farther than expected if the TLC plate is left in the developing chamber for an extended period of time.

That might lead to inaccurate Rf readings and the close-together spots colliding. With tweezers, remove the plate, and as soon as you can, pencil in the solvent front line.

If you wait too long, it will fade and you won't have all the data you need to figure out the Rf values.

There is no way to tell where the line should be drawn because the solvent front reached the top.

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Answer:

2CO2 + 3H2O ---> C2H5OH + 3O2

The working is in the picture.

Answer:

The correct option is the third statement (a solution with 10% solute and 90% solvent).

Explanation:

Reason for correct answer:

Reason for incorrect answers:

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Acid will have an increased concentration in someone who is suffocating then suffocating does not affect any body acid

Acid in the body are gastric acid or stomach acid is a digestive fluid formed within the stomach lining and with pH between 1 and 3 gastric acid play a key role in digestion of protein by activating digestive enzyme

And the asphyxiation also called asphyxia or called suffocation is when the body doesn't get enough oxygen and without immediate intervention it can get lead to loss of consciousness or brain injury or death so any acid in the body doesn't affect if someone is suffocating

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Acid has a pH below 7 while water has a pH of 7. A strong acid with a pH of roughly 3, HCl is. Water gets more acidic and loses pH in the range of 4-5 when HCl is added to it.

A substance's pH is a gauge of how basic or acidic it is. It is a measurement of the amount of H+ present in the solution. It is equivalent to the negative logarithm of the concentration of H+ ions mathematically.

A solution is acidic if its pH value is less than 7, and basic if it is greater than 7. Acids have a lower pH because they contain more H+ ions. Strong acid hydrochloric acid has a pH between 2 and 3.

Water has no charge. Water becomes acidic in pH if any acid is introduced. Therefore, if HCl is given to water, the pH of the water will change to 3-5 depending on the acid content.

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For instance, the empirical formula of a hydrocarbon is CH 2, and its M r is 42. Consequently, C 3H 6 is the hydrocarbon's chemical formula.

Finding the mass of C in CO2 and H in H2O is the initial stage in this process. This is accomplished by multiplying by the mass of the compound formed after dividing the atomic mass by the molecular mass. The empirical formula for this hydrocarbon is CH3, as we have a ratio of 1 carbon atom to 3 hydrogen atoms.

A saturated hydrocarbon with one ring has the generic formula CnH2n. For the majority of compounds, details other than the chemical formula are required to clarify their structure. However, a chemical formula's C:H ratio can reveal information about the chemical structure.

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Volume of the mineral sample is 30ml.

The buoyant force on a fluid is equal to the weight of the displaced fluid, according to Archimedes' principle. Equation buoyant force = density of fluid x volume of displaced fluid x acceleration due to gravity is used to calculate the buoyant force.

The formula Fb=Vg can be used to calculate the buoyant force. Fb = V g, where Fb is the buoyant force in Newtons, is the fluid density in kilograms per cubic meter, V is the volume of the displaced fluid in cubic meters, and g is the acceleration brought on by gravity.

Volume of mineral sample = 30ml

Volume of mineral sample = [tex]V_{final}[/tex] - [tex]V_{intial}[/tex]

Volume of mineral sample = 180-150

Volume of mineral sample = 30ml.

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The absorbance of a compound, with a molar absorptivity at 500 nm wavelength of 252 M⁻¹ cm⁻¹, prepared by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution, measured in a 4.00 mm pathlength cell, is 0.0282.

We'll start by figuring out the compound's molarity, which is determined by dividing the moles of solute by the liters of solution.

M = 0.00140/ 0.5000L = 0.00280M

Then, use the conversion formula 1 cm = 10 mm to convert 4.00 mm to cm.

4.00mm * 1cm/ 10mm = 0.400cm

Finally, we will use the Beer-Lambert equation to get the compound's absorbance.

A = E * b* C

where,

A: absorbance

ε: molar absorptivity

b: length of the light path

C: molar concentration

A = E * b* C

A =  25.2/ M.cm * 0.400cm * 0.00280M

A = 0.0282

The absorbance of a compound, with a molar absorptivity at 500 nm wavelength of 252 M⁻¹ cm⁻¹, prepared by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution, measured in a 3 .00 mm pathlength cell, is 0.0282.

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Hello..!

¿What is Cadenas tróficas?

Food chains are chains of living beings that inhabit a certain territory and that comply with the flow of

energy through your diet.

Answer:

MgO(s) + 2HCL(aq) --- > MgCl2(s) + H2O(l)

If the length of the cell is constant, a beer-lambert law plot will give a linear relationship between the concentration and the wavelength.

The Beer-Lambert law states that there is a linear relationship between the concentration and absorbance of a solution and that the concentration of a solution can be calculated by measuring its absorbance.

The Beer-Lambert Law is a linear relationship between the absorbance of a solution and its concentration, molar extinction coefficient, and optical coefficient:

                               A = εCL

where A is the absorbance

           ε is the extinction coefficient

           C is the concentration

            L is the length of the cell.

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The law of definite proportions state atoms combine in whole number ratios. Therefore, option B is correct.

According to the rule of definite proportions, every chemical compound has the same elements in the exact same mass quantities.

According to the law of definite proportions, sometimes referred to as the law of constant proportions, each of the constituent components of a chemical compound must always be present in a certain ratio in terms of their mass.

According to the law of definite proportion, the mass ratio of the components in compounds is constant. As an illustration, water from various bodies of water will still have 11% hydrogen and 89% oxygen.

Thus, option B is correct.

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The formula for the ideal-gas percent deviation is: PV = nRT, where R = 0.08206 L.atm/ k.mol = 8.3145 J/K.mol

General gas equation:

[tex]\frac{P_{i} V_{i} }{n_{i} T_{i} }[/tex] = [tex]\frac{P_{f} V_{f} }{n_{f} T_{f} }[/tex]

Density of gas:

р = [tex]\frac{MP}{RT}[/tex]

Any collection of relationships between a single quantity (such as V) and a number of other variables (such as P, T, and n) can be combined into a single statement that encompasses all of the relationships simultaneously. Prior to now, the following three unique expressions were derived:

Boyle’s law

V ∝ 1/P at constant n and T

Charles’s law

V ∝ T at constant n and P

Avogadro’s law

shows V ∝ n at constant T and P

by Combining these three expressions,

V ∝ nT/P

The proportionality constant, also referred to as the gas constant and represented by the letter R, can be written as follows by combining these three expressions:

V = Cons.(nT/P).

Equation becomes V = RnT/P = nRT/P when R is included.

To get rid of the fractions, multiply both sides of the equation by P to get PV = nRT.

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Therefore the concentration of NH3 is 30000mg/L.

What is density?

A material's density specifies the density of that material in a given region. The mass per unit volume of a material is defined as its density. The density of matter is a measurement of how tightly stuff is packed together. It is a specific physical property of anything. The density principle was established by Archimedes, a Greek scientist. Calculating density is simple if you know the formula and understand the units. The symbol denotes density, which can also be represented by the letter D.

Understanding density is critical since it affects many aspects of life. In physics, density is something that affects which clouds float high in the sky and which sink lower. The motions of gases in the atmosphere are determined by density when one material rises over another. It has an impact on what sinks and what floats in a body of water. So, what exactly does density imply? The definition of density is a measure of how dense matter is. Simply put, how much "things" can fit into a given space. The more "stuff" or substance crammed into a place, the denser it becomes.

Calculate the mass of NH3 in household ammonia as follow

[NH3] = weight of NH3 ( Density of water)

[NH3]= 30Kg/[tex]m^{3}[/tex]

[NH3] IN mg/L

Therefore the concentration of NH3 is 30000mg/L.

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The percent yield will be 103 %

Mass of potassium bicarbonate = 1.00 g

Molar mass of potassium bicarbonate = 100.115 g/mol

Mass of potassium carbonate = 0.710 g

Molar mass of potassium bicarbonate = 138.205 g/mol

Calculated yield = 0.690 g

Percent yield = ?

Calculated yield is given, if not you can find out by following steps:

Write the balanced chemical equation

    2KHCO₃ →  K₂CO₃ + H₂O + CO₂

Hence 2 moles of KHCO₃ decompose to produce 1 mole of K₂CO₃

This means that 2 × 100.115 g of KHCO₃ will produce 138.205 g of K₂CO₃

    Calculate for 1 g = 138.205  / 200.23

    Calculate for 1 g = 0.690 g

This means that 1 g of KHCO₃ will produce 0.690 g of K₂CO₃

Now calculate % yield

    % yield = (actual yield / calculated yield)

    % yield = (0.710 / 0.690) 100

    % yield = 1.029 * 100

    % yield = 103 %

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Explanation:

Relation between concentration and absorbance: Absorbance is directly proportional to the concentration of the substance. The higher the concentration, the higher its absorbance.

The relationship between absorbance of light by a solution and its concentration should be Linear

b) Linear

so that when concentration increases, absorbance Increases

c) Increases

The Beer-Lambert Law, also known as the Beer-Lambert-Bouguer Law, describes the relationship between the absorbance of light by a solution and the concentration of the absorbing solute in that solution. This law is fundamental in spectroscopy and is used to quantify the concentration of a solute in a solution.

The Beer-Lambert Law is expressed as:

A = ε * c * l

Where:

A is the absorbance of the solution (unitless),

ε is the molar absorptivity or molar extinction coefficient (a constant specific to the solute and the wavelength of light),

c is the concentration of the solute in the solution (usually in mol/L or M),

l is the path length of the light through the solution (usually in centimeters).

The relationship between absorbance of light by a solution and its concentration should be: Linear

so that when concentration increases, absorbance: Increases

In a linear relationship, the absorbance of light by a solution increases in direct proportion to the concentration of the solute in the solution. As the concentration of the solute increases, more light is absorbed by the solution, leading to a higher absorbance value.

Therefore, when the concentration of a solution increases, the absorbance of light by that solution also increases in a linear fashion.

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The complete question is:

The relationship between absorbance of light by a solution and its concentration should be ___

Choose:

a) Exponential

b) Linear

c) Inverse

so that when concentration increases, absorbance ___

Choose:

a) Does Not Change

b) Decreases

c) Increases

In the mentioned reaction:

Cu²⁺ + e⁻ → Cu ; Cu²⁺ is reduced

Fe → Fe³⁺ + 3e⁻ ; Fe is oxidized

2l⁻ → l₂ + 2e⁻ ; l⁻ is oxidized

2H⁺ + 2e⁻ → H₂ ; H⁺ is reduced

Oxidation is the process of adding oxygen or electronegative elements or removing hydrogen or electropositive elements. According to the electronic concept, oxidation is defined as the process of losing one or more electrons.

Reduction is the process of adding hydrogen or electropositive elements or removing oxygen or electronegative elements. According to the electron concept, reduction is defined as the process of gaining one or more electrons.

For the given problem,

The oxidation number of Cu²⁺decreased from +2 to 0. thus, it is reduced.

The oxidation number of Fe increased from 0 to +3, it is therefore oxidized.

The oxidation number of l⁻  increased from -1 to 0. It is oxidized.

The oxidation number of H⁺ decreased from +1 to 0. It has been reduced.

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Pbcl2 precipitate when 275 ml of a 0.134 m solution of pb(no3)2 is added to 125 ml of 0.0339 m solution of nacl? the ksp of pbcl2 is 1.17e-5.

Given that,

The volume of NaCl = 125 ml

Concentration of NaCl = 0.0339 m

The volume of Pb(NO3)2 = 275 ml

Concentration of Pb(NO3)2 = 0.134 m

K(eq) = 1.17 × 10(-5) --------(1)

Total volume = 275 + 125 = 400 ml

Pb(NO3)2 ------- Pb(+2) + 2 NO3(-)

at t = 0 0.134 0 0

at t = t 0 0.134 0.134

NaCl -------- Na(+) + Cl(+)

at t = 0 0. 0339 0 0

at t = t 0 0.0339 0.0339

PbCl2 ---------- Pb(+2) + 2Cl(-)

Q(sp) = [Pb+2] [ Cl-]^2

By substituting the values of conc. of all the ions, we get Pbcl2 precipitate when 275 ml of a 0.134 m solution of pb(no3)2 is added to 125 ml of 0.0339 m solution of nacl? the ksp of pbcl2 is 1.17e-5.

= (275 × 0.134/ 400) (125 × 0.0339/400)^2

= 9.8 × 10(-6)

As we noticed that, Ksp > Qsp

Therefore, PbCl2 will not precipitate.

Thus, we concluded that the Pbcl2 precipitate when 275 ml of a 0.134 m solution of pb(no3)2 is added to 125 ml of 0.0339 m solution of nacl? the ksp of pbcl2 is 1.17e-5.

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Actual mass of CO recovered is 99.4g

Balance equation is : SiO2 + 3C    SiC + 2CO

Molar mass of CO is 28.01 g/mol

Moles of CO = given mass/molecular mass = 100/28.1 = 3.55mol

mass = moles of sio2 x molecular mass

Actual mass = 3.55mol of CO x 28 = 99.4g

The amount of matter that makes up an element's atom, or atomic mass. It is expressed as a multiple of 1.992646547 1023 gram, which is equal to one-twelfth of the mass of the carbon-12 atom, which has an atomic mass of 12 units. 1 atomic mass unit (amu) is equal to 1.660539040 1024 grams on this scale. An indicator of an element's atomic mass is the atomic mass unit (AMU or amu). The atomic mass unit (AMU), also called the dalton (Da) or the unified atomic mass unit (u), expresses both atomic and molecular masses. Only 1/1,836 the mass of a proton, 9.1093837015 1031 kg, is the rest mass of an electron. Therefore, compared to a proton or neutron, an electron is thought to be almost massless, and the electron mass

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The Wobble Hypothesis describes how different codons can represent the same amino acid. The less precise base pairings that can form between the third base of the codon and the base at the first position on the anticodon allow one tRNA molecule (with one amino acid attached) to recognize and bind to several codons.

A basic amino group (NH2), an acidic carboxyl group (COOH), and an organic R group (or side chain) that is specific to each amino acid make up an amino acid, an organic molecule.

Alpha-amino carboxylic acid is referred to as an amino acid informally.

An amino and a carboxyl group are both joined to the core carbon (C) atom, known as the -carbon, in every molecule. A hydrogen (H) atom and the R group typically fulfill the remaining two bonds of the -carbon atom.

The building components of proteins are amino acids. The vast majority of chemical processes that take place in cells are catalyzed by proteins. They give cells a lot of their structural components and aid in fusing cells into tissues.

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For gram of the chemical that interacted with oxygen, -41.83 KJ of heat were released.

Heat is the exchange in "thermal" energy caused by a temperature difference. Imagine a system that is isolated and has two subsystems that really are initially running at different temperatures. Energy is moved from the lower temperature subsystem 1 to the high thermal subsystem 2.

Because heat is a type of energy, the SI unit for heat also is joules (J), which is defined as the quantity of energy required to elevate the temperature of the a mass m by one degree. This is significant because heat is a kind of energy. To calculate heat, divide the temperature change of a water sample by its mass.

2C6H6 + 15O2 -> 12CO2 + 6H2O

2x49.04 2x10 12x-393.5 6x-285.8

= [12(-393.5)+6(-285.8)] - [2(49.04)+(2x10)]

= -6936.8 -98

= -6534.8 KJ/mole

Per gram of C6H6

= (-6534.8 KJ / 2 mole of C6H6)(1 mole of C6H6 / 78.108g)

= -41.83 KJ / mole

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The process of crenation occurs when the concentration of solute outside the cell is than inside the cell and the solution is said to be hypertonic.

What is crenation?

In botany and zoology, the term "crenation" refers to the round-toothed or scalloped shape of an object, particularly a leaf or shell. Modern Latin crenatus, meaning "scalloped or notched," is derived from common Latin crena, meaning "notch."

The term  can refer to a variety of items, including cells. One process of crenation is the contraction of a cell upon exposure to a hypertonic solution due to the loss of water through osmosis.Cucumber pickling and salt-curing of beef are practical applications of crenation.

Hence, the process of crenation occurs when the concentration of solute outside the cell is than inside the cell and the solution is said to be hypertonic.

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One mole of Pb has the greatest mass and the mass is 207g

We know, that mass = given mole × Molecular weight

According to the given question, we need to find the masses of 1 mole of Na(Sodium), Pb(Lead), Be(Beryllium) and H₂

So,

Mass of Na = 1 × 23 = 23g

Mass of Pb = 1 × 207 = 207g

Mass of Be = 1 × 9 = 9g

Mass of H₂ = 1 × 2 = 2g

Therefore, one mole of Pb (lead) has the greatest mass among the given four elements that are Na, Be and H₂.

The Molar mass of a substance is the mass in grams of one mole of the compound. Pb( lead) is a soft, malleable, ductile and dense metallic element.

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The average kinetic energy depends on the mass and speed of the particles. At constant temperature, every gas molecules have the same average kinetic energy.

Kinetic energy is a form of energy generated by virtue of motion of an object. When the object is at rest the energy is stored in the form of potential energy whereas, when they start to move they gain a kinetic energy.

Average kinetic energy of a particle, depends on temperature by the equation :

K =  3/2 KT

Therefore it is independent of mass and speed of the particles. However the speed of ions at constant temperature will be different.

Hence, at constant temperature, the average kinetic energy of all the gases will be the same. Thus, option E is correct.

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Your question is incomplete. But your complete question probably was:

At a constant temperature, which of the gases will have the highest average

kinetic energy?

A) H2

B) N2

C) O2

D) F2

E) All the gases will have the same average

kinetic energy.