what is the purpose of the aqueous sodium bisulfite solution that is added during the workup of the bromination reaction?

The chemical reactions and nuclear reactions have different kinetic behavior.  the order for a nuclear decay reaction is first order.

The chemical reaction is the reaction in which molecules interact to form the product. while in the nuclear reaction is the type of the reaction in which the change in the structure of nucleus takes place with the release of the energy. the chemical reactions and the nuclear reaction have the different kinetic behavior. in the chemical reaction the balance term is the mass while in the nuclear reaction the balance term is the mass and the energy both.

Thus the order of the nuclear decay is the first order.

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Answer:

it's volume also decrease

Answer:

A

Explanation:

10ml

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Answer:

emprical weight=ch2o

=12*12*1*1*16 =30

Molecular mass=n*emprical weight

60=n*30

N=60/30=2

Molecular formula=n*emprical formula=2*30

=60

C2h4o2

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Answer:

Explanation: b

Answer: Pure substances are substances that are made up of only one kind of particle and have a fixed or constant structure.

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Let us take our minds back to the kinetic theory of matter. Recall that the particles that compose matter are in constant random motion and the solids are arranged in a definite pattern while the particles of a gas are in random motion.

As such, the zinc has its atoms in a fixed pattern while the hydrogen atoms are roaming freely in the gaseous state.

Given that;

Amount of the acid = 10.95 g/36.5 g/mol = 0.3 moles

Amount of the zinc = 1g/65 g/mol = 0.015 moles

Given the reaction equation; \(Zn(s) + 2HCl(aq) ------ > ZnCl_{2} (aq) + H_{2}(g)\)

1 mole of Zn reacts with 2 moles of acid

0.015 moles of zinc reacts with x moles of acid

x =0.015 moles * 2 moles / 1 mole

= 0.03 moles

Thus, the zinc is the limiting reactant.

1 moles of the zinc produces 1 mole of the hydrogen

The amount of the hydrogen produced =  0.03 moles * 2 g/mol

= 0.06 moles of hydrogen

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The most likely mistake responsible for the error in the measured absorbance is that The student added too little solute to the acetone before measuring its absorbance.

Spectrophotometry is a branch of electromagnetic spectroscopy that deals with quantifying a material's reflection or transmission properties as a function of wavelength. Absorbance (A), also known as optical density, is the quantity of light absorbed by a solution (OD). Transmittance is the quantity of light that passes through a solution.

A spectrophotometer is a device that monitors the number of photons (light intensity) absorbed when a sample solution passes through it. The spectrophotometer may also be used to measure the quantity of a known chemical substance (concentrations) by measuring the intensity of light observed. Absorbance is the quantity of light of a specific wavelength that a given substance prevents from passing through it.

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The process that can be responsible for the movement of glucose from the inside of the artificial cell to the solution outside would be diffusion.

Diffusion is a cellular transport whereby molecules of solutes of gases move from the region of higher to the region of lower concentration.

Diffusion is different from osmosis. The latter is a form of cellular transport whereby water molecules move from the region of higher water potential or lower concentration of solutes to the region of lower water potential or higher concentration of solute with the involvement of a selectively permeable membrane.

The inside of the artificial cell in the image contains 10% glucose while the outside solution is made of distilled water. Thus, glucose molecules can diffuse from the inside of the cell to the outside.

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Answer: The particles need energy to overcome the attractions between them. As the liquid gets warmer more particles have sufficient energy to escape from the liquid. Eventually even particles in the middle of the liquid form bubbles of gas in the liquid.

Explanation:

21.16 g. Balance the equation, as stated. Mo2O3 + 3 ZnO = 3 Zn + 2 MoO3. and have their molar masses ready. Zn - 65.38 MoO3 - 143.96 Mo2O3 - 239.92.

When a chemical reaction is complete, the limiting reagent—also known as the limiting reactant or limiting agent—is the reactant that has been completely consumed. As the reaction cannot proceed without this reagent, the amount of product that can be produced is constrained. Excess reagents or excess reactants are any reagents that are present in amounts greater than those necessary to cause a reaction with the limiting reagent (sometimes abbreviated as "xs"). Although the amount of product produced when the limiting reagent interacts entirely is defined as the theoretical yield, the limiting reagent must be determined in order to calculate the percentage yield of a reaction. Considering  the reaction's description in the balanced chemical equation.

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Chromatography is a method of separating out materials from a mixture.

Aim:  To separate the dye present in ink by the process of evaporation.

Materials required:  Beaker, watch glass, water, ink and stove.

Procedure: Take a beaker and fill it to half its volume with water.  Keep 3, glass on the mouth of a beaker.  Put few drops of ink on the watch glass. Heat the beaker and observe the watch glass.  

Observations:   We observe some fumes coming from the watch glass.   Continue heating till you do not observe any further change on the watch glass.   A small residue will be remained on the watch glass.  

Inference:   We know that ink is a mixture of a dye in water.   The residue remained on the watch glass is the dye present in the ink.

Chromatography is a method of separating out materials from a mixture. Ink is a mixture of several dyes and therefore we can separate those colors from one another using chromatography.

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7.95 × 10

= 79.5

This is the answer

In the given scenario, a piston-cylinder system receives 51 kJ of heat and loses 12 kJ. The system produces work, and To calculate work we can use W = Q - ΔU formula

The first law of thermodynamics states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system. Mathematically, this can be represented as:

ΔU = Q - W

Where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.

In this case, the system receives 51 kJ of heat (Q = 51 kJ) and loses 12 kJ (Q = -12 kJ). We need to calculate the work done by the system (W).

Using the first law of thermodynamics equation, we can rearrange it to solve for W:

W = Q - ΔU

Since the change in internal energy (ΔU) is not given, we cannot directly calculate the work done. Additional information about the change in internal energy or any other relevant parameters would be required to determine the amount of work produced by the system.

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The pressure of the NH3 gas is 2.19 atm, a sample of 4.30 moles of NH3 gas occupies 6.50 L at 45°C.

Gas pressure is the force per unit area exerted by a gas on the walls of its container. It is a measure of the number of gas molecules colliding with the container's walls per unit of time, and is proportional to the number of gas molecules and their kinetic energy. It is a result of the gas molecules moving randomly in all directions and colliding with the walls of the container. When a gas is confined in a container, its pressure is exerted equally in all directions. The pressure is a scalar quantity, which means it has only magnitude and does not have a direction.

Gas pressure can be measured in a variety of units, including atmospheres (atm), torr, pascals (Pa), and pounds per square inch (psi). The most commonly used units for measuring gas pressure are atmospheres and pascals.

To calculate the pressure of a gas, the Ideal Gas Law is used which states that \(PV = nRT\), where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

First step:  Convert the temperature from Celsius to Kelvin:

45°C + 273.15 = 318.15 \(K\)

Second step:Plug in the values and solve for P:

\(P = (nRT) / V\)

\(P = (4.30 moles * 0.0821 Latm/molK * 318.15 K) / 6.50 L\)

\(P = 2.19 atm\)

So, the pressure of the \(NH3\) gas is 2.19 \(atm\).

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Based on the equation of the reaction;

a) The oxidation states of each of the atoms in the compounds are given below:

(b) The atom that gets oxidized is Pb and the atom that gets reduced is Pb in PbO₂

(c) The reactant that is the oxidizing agent is PbO₂ and the reactant that is the reducing agent is Pb.

An oxidizing agent is a substance that causes oxidation by accepting electrons from another substance in a redox reaction whereas, a reducing agent is a substance that causes reduction by losing electrons to another substance in a redox reaction,

In redox reactions, oxidizing agents are reduced while the reducing agents are oxidized.

A gain or loss of electrons results in a change in the oxidation states of elements.

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Answer:

b and In a primitive unit cell, particles or points are present only at the corners while in a centred unit cell, the particles or points are also present at other positions in addition to the corner

Explanation:

Answer:

the answer would be B :)

The correct answer is; Bonds create new elements

Chemical bonds are formed when two or more atoms are joined together to form a compound.

Chemical compounds are more stable than the respective elements from which they are formed.

Chemical bonds do not create new elements.

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The wavelength of radiation required to ionize b4 is therefore equal to 4.51 kj/mol / 10.8 eV, or 0.42 nm.

What is radiation?
Based on the energy of a radiated particles, radiation is frequently divided into ionising and non-ionizing categories. More than 10 eV is carried by ionising radiation, which is sufficient to ionise atoms as well as molecules and rupture chemical bonds. Due to the significant differences in how harmful these substances are to living things, this distinction is crucial. Radioactive substances that emit radiation in the form of helium nuclei, electrons as well as positrons, or photons are frequently sources of ionising radiation.

The ground state ionization energy of b4 is the energy required to remove an electron from the atom in its ground state. This energy is usually expressed in kilojoules per mole (kj/mol) and is equal to the amount of energy required to ionize one mole of b4 atoms.

The wavelength (λ) of radiation required to ionize b4 is the energy of the photon of radiation divided by the ground state ionization energy of b4. This wavelength is usually expressed in nanometers (nm).

The ground state ionization energy of b4 is 10.8 eV, which is equal to 4.51 kj/mol. The wavelength of radiation required to ionize b4 is therefore equal to 4.51 kj/mol / 10.8 eV, or 0.42 nm.

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The definition of the mole means that for any element, the number of grammes in a mole is equal to the number of atomic mass units in the element's atomic mass. One mole of magnesium, for instance, weighs 24.305 g (atomic mass = 24.305 amu).

A substance's volume is measured in moles, which are 6.022 x 1023 units (such as atoms, molecules, or ions).

The mole, denoted by the sign "mol," is the volume of a system that has the same number of atoms in 0.012 kilogrammes of carbon-12 as there are elementary particles.

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Carbon dioxide

Explanation:

because when hydrogen mixes with oxygen carbon dioxide is canceled out

The temperature of the gas is approximately 100.8 K. To find the temperature of an ideal gas, we'll use the formula for the internal energy of an ideal gas (U) and the ideal gas law. The given terms are the internal energy (U = 3770 J), the number of moles (n = 3 moles), and the pressure (P = 1 atm, which is approximately 101325 Pa).

First, we'll use the internal energy formula for an ideal gas: U = (3/2)*nRT, where R is the universal gas constant (8.314 J/mol·K). We're solving for the temperature (T), so we'll rearrange the formula to isolate T:

T = (2/3)*(U / nR)

Now, plug in the given values:
T = (2/3)*(3770 J / (3 moles × 8.314 J/mol·K))
T = (2/3)*(3770 J / 24.942 J/mol·K)
T = (2/3)*(151.213 K)
T = 100.809 K

Therefore, the temperature of the gas is approximately 100.8 K. This calculation assumes the gas behaves ideally and allows us to determine the temperature given the internal energy, number of moles, and pressure.

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Explanation:

What happened to the ruler when you suddenly released it

1) Groups of elements in the periodic table.

On the left, there are several types of metals and on the right, there are nonmetals, halogens, and noble gases.

There is a group that is between those mentioned above, the semi-metals also known as Metalloids.

.

The balanced nuclear equation for the positron emission of nitrogen-13 can be represented as \(^{13}N \rightarrow ^{13} C + e^+ + \nu e\).

In this equation, nitrogen-13 (\(^{13}N\)) undergoes positron emission, resulting in the formation of carbon-13 (\(^{13}C\)), a positron (e⁺), and an electron neutrino (νe).

Positron emission is a type of radioactive decay where a proton in the nucleus is converted into a neutron, and a positron is emitted. The positron, which is a positively charged electron, is represented as e⁺. The emission of a positron occurs to stabilize the nucleus by reducing the number of protons.

In the case of nitrogen-13, one of the protons in the nucleus undergoes this conversion, resulting in the production of carbon-13, which has one additional neutron compared to nitrogen-13.

The accompanying emission of a positron and an electron neutrino completes the equation, ensuring the conservation of both mass number and atomic number.

So, the balanced nuclear equation accurately represents the positron emission of nitrogen-13, demonstrating the transformation of the nucleus and the particles involved in the decay process.

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Answer:

Collect the runoff in retention ponds lined with protective barriers

Explanation:

The best solution would be to collect the runoff in retention ponds lined with protective barriers.

In order to stop the continuous contamination of the groundwater, it is imperative to cut-off the source of the contaminant which is the run-off. Hence, collecting the runoff in a retention pond lined with protective barriers will ensure that the contaminant's supply is cut-off.

Efforts can then be put in place to decontaminate the already contaminated groundwater.

Answer

B. Collect the runoff in retention ponds lined with protective barriers

Answer:

Sodium - Na

Chloride - Cl

= NaCl

Lithium - Li

Bromide - Br

=LiBr

Calcium - Ca

Chloride - Cl

=CaCl2

Explanation:

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