if the half life of carbon-14 is 5730 years, and you have a sample that has lost 80% of its carbon-14, how old is the sample?

Mass defect is the difference between the predicted mass and the actual mass of an atom's nucleus. (Option C)

mass defect and is a measure of the total binding energy of the nucleus. Mass defect can be defined as the difference between the predicted mass and the actual mass of an atom's nucleus.

Therefore, the mass defect measure the difference between the predicted mass and the actual mass of an atom's nucleus.

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Answer:

4 liters I think actually hold on

Magnets on a railroad provide electricity to a train by electrifying the propulsion loops generates magnetic fields that both pull the train forward from the front and push it forward from behind.

A magnetic field is described as a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.

Electrodynamic suspension (EDS) uses superconducting electromagnets or strong permanent magnets that create a magnetic field, this  magnetic field induces currents in nearby metallic conductors when there is relative movement and hence  pushes and pulls the train towards the designed levitation position on the guide way thereby providing electricity.

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yes you do need to multiply it by 22.4

Answer:

70.21375

Explanation:

rounded to he nearest tenth place 70.2

Answer:

The Eukaryotic cell that the organelle shows below belongs to the Nucleus.

Explanation:

In fact, the mere presence of a nucleus is considered one of the defining features of a Eukaryota cell.

Answer:

The heliocentric theory was better supported by data explaining the rotation of the planets and other bodies in the solar system.

Explanation:

2.56 moles of HCl are required to react with 0.64 moles of KMnO4.

The balanced chemical equation is given as;2KMnO4 + 8HCl → 3Cl2 + 2MnO2 + 4H2O + 2KCl.This equation is balanced in such a way that 2 moles of KMnO4 reacts with 8 moles of HCl to produce 3 moles of Cl2, 2 moles of MnO2, 4 moles of H2O and 2 moles of KCl.We are given the number of moles of KMnO4 as 0.64 moles.Now, we can use stoichiometry to find the number of moles of HCl required to react with 0.64 moles of KMnO4.The balanced chemical equation shows that 8 moles of HCl reacts with 2 moles of KMnO4.

So, one mole of KMnO4 would react with 8/2 = 4 moles of HCl.Now, the number of moles of HCl required to react with 0.64 moles of KMnO4 would be;Moles of HCl = Moles of KMnO4 x (Moles of HCl / Moles of KMnO4) Moles of HCl = 0.64 x 4 = 2.56 moles of HCl.

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Answer:

it have been already balanced

2H2 + O2 = 2H2O.

Answer:

there are more hydrogen ions than hydroxide ions in the solution. This kind of solution is acidic. A base is a substance that accepts hydrogen ions.

Explanation:

An acid is a substance that donates hydrogen ions. ... Now there are more hydrogen ions than hydroxide ions in the solution. This kind of solution is acidic. A base is a substance that accepts hydrogen ions. When a base is dissolved in water, the balance between hydrogen ions and hydroxide ions shifts the opposite way.

Answer:

An acid–base reaction is a chemical reaction that occurs between an acid and a base. It can be used to determine pH.

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Approximately 19.3 million protein molecules are present in a 7.923 fg sample with a molecular weight of 248,376.4 g per mole. To calculate the number of protein molecules present in a 7.923 fg sample, we need to use the following formula:

\(Number of molecules = (mass of sample / molecular weight) x Avogadro's number\)where Avogadro's number is \(6.022 x 10^23\) molecular weight per molecule.

First, we need to convert the mass of the sample from femtograms to grams: \(7.923 fg = 7.923 x 10^-15 g\)

Next, we can use the formula to calculate the number of protein molecules weight:

Number of molecules = \((7.923 x 10^-15 g / 248,376.4 g/mol) x 6.022 x 10^23 molecules/molecule:\)

Number of molecules = 1.93 x 10^7 molecules.

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A chemical reaction can be concisely represented by a chemical equation. The substances that undergo a chemical change are the reactants. The new substances formed in a chemical reaction are the products. In accordance with the law of conservation of mass, a chemical equation must be balanced. When balancing an equation, you place coefficients in front of reactants and products so that the same number of atoms of each element are on each side of the equation.

A chemical reaction can be concisely represented by a chemical equation. The substances that undergo a chemical change are the reactants. The new substances formed in a chemical reaction are the products. In accordance with the law of conservation of mass, a chemical equation must be balanced. When balancing an equation, you place coefficients in front of reactants and products so that the same number of atoms of each element are on each side of the equation. This balancing ensures that the mass of the reactants and products remains the same before and after the reaction, as per the law of conservation of mass. This representation of chemical reactions in chemical equations helps us understand the underlying chemical processes.
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Answer:

First, convert Liters to grams. Then convert grams to moles

Explanation:

When two amino acid monomers are positioned so that the carboxyl group of one is adjacent to the amino group of the other, they can be joined through a reaction.

It is True.

Amino acid molecules make up proteins. Proteins and amino acids are essential to life. After proteins have been digested or broken down, amino acids are still present. To maintain the body, the human body makes proteins from amino acids: Prepare food.

Taking a supplement containing essential amino acids is wonderful because you can do so anytime you choose. While some athletes prefer to take it with meals or a protein shake, others prefer to take it on an empty stomach in between meals.

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Answer:

c because this is the one hundred all the time

Explanation:

Answer:

The correct answer is Na2CO3. 10H2O

A- the vapour pressure of toluene in solution is 4.98 kPa, B-the addition of C₆₀ to toluene causes a decrease in the chemical potential of toluene by approximately 13.6 J/mol.

a) The vapor pressure of the toluene solution can be calculated using Raoult's law:

mass of toluene = 100 g

molar mass of toluene = 92.14 g/mol

moles of toluene = 100 g / 92.14 g/mol = 1.085 mol

mass of C₆₀ = 2.33 g

molar mass of C₆₀ = 720.64 g/mol

moles of C₆₀ = 2.33 g / 720.64 g/mol = 0.00323 mol

total moles = 1.085 mol + 0.00323 mol = 1.088 mol

The mole fraction of toluene is therefore:

x(toluene) = 1.085 mol / 1.088 mol ≈ 0.997

The vapor pressure of the toluene solution can now be calculated using Raoult's law:

P(solution) = x(toluene) × P(toluene)

where P(toluene) is the vapor pressure of pure toluene at 30°C, which is given as 5 kPa. Therefore:

P(solution) = 0.997 × 5 kPa ≈ 4.98 kPa

b) The change in the chemical potential of toluene caused by the addition of C₆₀ can be calculated using the formula:

Δμ = RTln(γ₁/γ₁°)

Using the value of P(solution) calculated in part (a), we can calculate the activity of toluene in the solution:

P(solution) = x(toluene) × P(toluene) = 0.997 × 5 kPa ≈ 4.98 kPa

The activity coefficient of toluene in the solution can now be approximated as:

γ₁ = P(solution) / P(toluene) = 4.98 kPa / 5 kPa = 0.996

The change in chemical potential of toluene can now be calculated:

Δμ = RTln(γ₁/γ₁°) = (8.314 J/mol/K) × (303 K) × ln(0.996/1) ≈ -13.6 J/mol.

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0.0989 grams of KOH is needed to neutralize 12.6 mL of 0.14 M HCl in stomach acid.

Volume of HCl solution = 12.6 mL = 0.0126 L

The concentration of HCl solution = 0.14 M We have to find the amount of KOH required to neutralize the given volume and concentration of HCl.

In order to calculate the amount of KOH, we need to first calculate the number of moles of HCl using the formula of Molarity;

Molarity = (Number of moles of solute) / (Volume of solution in liters)0.14 M = n(HCl) / 0.0126L0.14 × 0.0126 = n(HCl)n(HCl) = 0.001764 moles of HCl

Now, the balanced chemical equation for the reaction of KOH with HCl is;KOH + HCl → KCl + H₂OOne mole of KOH reacts with one mole of HCl.

Therefore, the number of moles of KOH required to neutralize the given amount of HCl would be equal to 0.001764 moles. Now, let's calculate the amount of KOH in grams.

Molar mass of KOH = 39.1 + 16.00 + 1.008 = 56.108 g/mol0.001764 moles of KOH would weigh = 0.001764 × 56.108 = 0.0989

hence, the amount of KOH required to neutralize the given volume and concentration of HCl would be 0.0989 grams.

Thus, 0.0989 grams of KOH is needed to neutralize 12.6 mL of 0.14 M HCl in stomach acid.

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Answer:

–1065.25 KJ of energy.

Explanation:

From the question given above, the following data were obtained:

4FeO + O₂ —> 2Fe₂O₃  ΔH = –560.66 kJ

From the balanced equation above,

The formation of 2 moles of Fe₂O₃ released –560.66 kJ of energy.

Finally, we shall determine the amount of heat energy released when 3.8 moles of Fe₂O₃ are produced. This can be obtained as follow:

From the balanced equation above,

The formation of 2 moles of Fe₂O₃ released –560.66 kJ of energy.

Therefore, the formation of 3.8 moles of Fe₂O₃ will release

= (3.8 × –560.66)/2 = –1065.25 KJ of energy.

Thus, –1065.25 KJ of energy is released from the reaction.

Intermolecular forces in the liquid are also high is true. Option A.

The temperature at which a liquid transitions into a gas phase is known as the boiling point of the liquid. The strength of the intermolecular forces between the liquid's molecules has an impact on it. Stronger intermolecular forces are typically associated with higher boiling points.

The intermolecular forces in the liquid are also high, according to option a). This is true because strong intermolecular forces are frequently linked to high boiling temperatures. The molecules are firmly attached to one another in a liquid with high intermolecular interactions, which means it takes more energy to convert the liquid into a gas phase.

The liquid has small intermolecular gaps, according to option b). This statement has nothing to do with the liquid's boiling point specifically.Regardless of the boiling point, the intermolecular gaps in a liquid are usually close together. Not the intermolecular gaps, but the intensity of the intermolecular forces is what determines boiling point.

The kinetic energy of molecules is modest, according to option c). This claim may not always be accurate. The kinetic energy of molecules and the boiling point are not directly correlated. The movement and speed of molecules are determined by their kinetic energy, however this energy is not the only factor in determining the boiling point.

The right response is therefore that there are strong intermolecular forces in the liquid. Stronger intermolecular forces are indicated by higher boiling temperatures since it takes more energy for molecules to break through these forces and enter the gas phase. So, the answer is A.

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Answer:

See Explanation

Explanation:

It is a common observation that a strip of aluminium metal in aqueous copper(II)Sulfate does not show any visible reaction. Aluminium is normally expected to displace copper in solution since it is higher than copper in the electrochemical series.

The reason for this is that aluminium forms an oxide film around its surface which prevents reaction with aqueous copper(II)Sulfate. This oxides film protects the aluminium surface such that it is now unable to react with the aqueous copper(II)Sulfate

The type of structural isomerism arises when a particular ligand is capable of coordinating to a metal in two ways is linkage isomer.

Structural isomerism is a kind of isomerism in which molecular formula of the compound is same but they all have different arrangement of atoms or bonding in them.

If in any compound particular ligand is attached to the metal through different sides of the compound, then the product which is formed by these arrangement is known as linkage isomers.

Example of the linkage isomer is attached below.

Hence, the required isomerism is linkage isomerism.

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The mass of tin (IV) carbonate, Sn(CO₃)₂, formed when 50 mL of 0.2 mol/L of tin (IV) phosphate is mixed with excess sodium carbonate is 7.17 g

Volume = 50 mL = 50 / 1000 = 0.05 L

Molarity of Sn₃(PO₄)₄ = 0.2 mol/L

Mole = Molarity × Volume

Mole of Sn₃(PO₄)₄ = 0.2 × 0.05

Sn₃(PO₄)₄ + 6Na₂CO₃ → 3Sn(CO₃)₂ + 4Na₃PO₄

From the balanced equation above,

1 mole of Sn₃(PO₄)₄ reacted to produce 3 moles of Sn(CO₃)₂.

Therefore,

0.01 mole of Sn₃(PO₄)₄ will react to produce = 0.01 × 3 = 0.03 mole of Sn(CO₃)₂.

Mole of Sn(CO₃)₂ = 0.03 mole

Molar mass of Sn(CO₃)₂ = 119 + 2[12 + (16×3)] = 239 g/mol

Mass = mole × molar mass

Mass of Sn(CO₃)₂ = 0.03 × 239

Therefore, the mass of tin (IV) carbonate, Sn(CO₃)₂, formed from the reaction is 7.17 g

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Answer:

8

Explanation:

This number normally equals the number of electrons that atom needs to have a total of eight electrons (an octet) in its outer shell.

While geothermal energy is energy that comes from heat contained in the bowels of the earth and is generally associated with the presence of volcanoes. Technically, water that comes from, among other things, rain will seep into the rock beneath the ground until it reaches the reservoir rock.

Geothermal electricity generation is done by drilling the ground in areas that have geothermal potential to create hot gas holes which will be used to heat the boiler so that the steam can drive a steam turbine connected to a generator. For geothermal energy that has high pressure, it can directly rotate the generator turbine, after the steam that comes out is cleaned first.

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Answer: the third one 2065

Explanation:

q= (13g)(4.18)(38)

q=2064.92 ≈ 2065

We have that the first step is to put the Power source into an on state,Thereby powering the Light point and the Spectrophotometer.

From the question we are told

identify the first step in preparing a spectrophotometer for use.

Generally

This is a device is out there to help scientist i the mostly in the field of chemistry.

Therefore

The first step is to put the Power source into an on state,Thereby powering the Light point and the Spectrophotometer.

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The gas which have highest average kinetic energy per mole at 298K is b)CO₂.So,correct option is b.

The kinetic energy of gases is a straightforward, generally critical traditional model of the thermodynamic way of behaving of gases, with which numerous foremost ideas of thermodynamics were laid out. The model depicts a gas as an enormous number of indistinguishable submicroscopic particles (iotas or atoms), which are all in consistent, fast, irregular movement. Their size is thought to be a lot more modest than the typical distance between the particles. The particles go through irregular flexible impacts among themselves and with the encasing walls of the compartment. The fundamental rendition of the model depicts the best gas, and thinks about no different communications between the particles.

The kinetic energy of gases makes sense of the perceptible properties of gases, like volume, pressure, and temperature, as well as transport properties like consistency, warm conductivity and mass diffusivity. Because of the time reversibility of minute elements (minuscule reversibility), the motor hypothesis is likewise associated with the guideline of nitty gritty equilibrium, concerning the variance dissemination hypothesis (for Brownian movement) and the Onsager proportional relations.

We know that average kinetic energy is given by the formula =(1/2) mv²

Since temperature is same for all gases, so speed will remain same.

Now,molecular mass will be deciding factor.So,gas which have high molecular mass will have more average kinetic energy.

Molecular mass of O₂=32g

Molecular mass of CO₂=44g

Molecular mass of H₂O(g)=18g

Molecular mass of H₂O(l)=18g

Hence,option b is correct.

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