why does lead exist in a higher amount in brown algae than plankton?​

The lithium ion[Li⁺]=1.642 M

Ionic compounds will dissociate into ions when dissolved in water. The strength of the dissociation depends on the strength of the electrolyte properties. The stronger it is, the more ions will dissociate

Reaction

Li₂S⇒2Li⁺+S²⁻

mol ratio Li₂S : Li⁺: S²⁻ = 1 : 2 : 1

so the lithium-ion (Li⁺) concentration :

\(\tt 2\times 0.821=1.642~M\)

Answer:

Option A is the correct answer.

Explanation:

• According to Rutherford every atom consists of dense positively charged particle at the centre known as nucleus.  

• Nucleus consists of positively charged particle known as proton and neutral particle known as neutron.

• Alpha particles are the protons thus, it also have a positive charge.

• Since, both alpha particles and nucleus are positively charge, repulsion occurs between them which deflects the alpha particle from their actual path.

• This repulsion doesn’t depend on the number of protons present in the nucleus.

• Thus, the alpha particle fired at the nucleus would have the same strength of repulsive forces deflecting it, even if the atom’s nucleus had fewer protons than gold is a correct answer.

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1. The IUPAC name of N is nitrogen.

2. Nitrogen dioxide

3.The IUPAC name of O is oxygen

4.The IUPAC name of OH is hydroxyl.

The IUPAC name of ·0 is a radical. It is commonly found in organic chemistry and plays an important role in many reactions.

IUPAC names for the given compounds are:1.1. N: Nitrogen

The IUPAC name of N is nitrogen.

It is a non-metal and belongs to group 15 in the periodic table. It has an electronic configuration of 1s2 2s2 2p3.1.2. NO2: Nitrogen dioxide

Explanation: NO2 is a chemical compound that is formed by the combination of nitrogen and oxygen. It is a reddish-brown gas that has a pungent odor.

The IUPAC name of NO2 is nitrogen dioxide.1.3. O: Oxygen

Explanation: The IUPAC name of O is oxygen.

It is a non-metal and belongs to group 16 in the periodic table. It has an electronic configuration of 1s2 2s2 2p4.

X: UnknownExplanation: No IUPAC name can be given to an unknown compound as the structure and composition are not known.

Y: Hydroxyl Explanation: The IUPAC name of OH is hydroxyl.

It is a functional group that is composed of an oxygen atom and a hydrogen atom (-OH). It is commonly found in alcohols and phenols. ·0: RadicalExplanation: A radical is a molecule or an ion that contains an unpaired electron.

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Note: The complete question is given below

Provide the IUPAC names for the following compounds:

\(CH_3CH_2CH(CH_3)CH_2CH_2CH_2CH_3\)

C6H5CH(CH3)2

H2NCH2CH2CH2CH2CH2NH2

CH3CH2CH2CH2CH2OH

CH3CH2CH2CHOHCH3

The lattice energy of MX is 459.2 kJ/mol.

The lattice energy (ΔH° lattice) of an ionic compound is the energy released when one mole of the solid is formed from its constituent gaseous ions under standard conditions. The lattice energy is calculated using the Born-Haber cycle, which involves several steps including atomization, ionization, dissociation, and sublimation energies.

The lattice energy is related to the Coulombic attraction between the oppositely charged ions in the solid. To calculate the lattice energy for MX, we can use the following equation:

ΔH° lattice = ΔH° sub + ΔH° ion + ΔH° diss + ΔH° formation

where ΔH° sub is the sublimation energy of M(s), ΔH° ion is the first ionization energy of M(g), ΔH° diss is the dissociation energy of X2(g), and ΔH° formation is the enthalpy of formation of MX(s).

Using the given data, we can calculate each of these values and substitute them into the equation to obtain the lattice energy. The final answer should be in units of kJ/mol.

ΔH° sub (M) = 107.3 kJ/mol

ΔH° ion (M) = 577.5 kJ/mol

ΔH° diss (X2) = 242 kJ/mol

ΔH° formation (MX) = -467.6 kJ/mol

ΔH° lattice = 107.3 + 577.5 + 242 + (-467.6) = 459.2 kJ/mol

As a result, MX has a lattice energy of 459.2 kJ/mol.

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Answer: kinetic or A :)

Explanation: kinetic energy Alpha particles have typical kinetic energy of 5 MeV (or ≈ 0.13% of their total energy 110 TJ/kg) and have a speed of about 15 000 000 m/s or 5% of the speed of light.

hope this helped !! - hailey

Answer:

19.3 g

Explanation:

Step 1: Write the balanced reaction

Pb(NO₃)₄ + 4 NaCl ⇒ 4 NaNO₃ + PbCl₄

Step 2: Calculate the moles corresponding to 25.2 g of Pb(NO₃)₄

The molar mass of 455.22 g/mol.

25.2 g × 1 mol/455.22 g = 0.0554 mol

Step 3: Calculate the moles of PbCl₄ produced from 0.0554 moles of Pb(NO₃)₄

The molar ratio of Pb(NO₃)₄ to PbCl₄ is 1:1. The moles of PbCl₄ produced are 1/1 × 0.0554 mol = 0.0554 mol.

Step 4: Calculate the mass corresponding to 0.0554 moles of PbCl₄

The molar mass of PbCl₄ is 349.01 g/mol.

0.0554 mol × 349.01 g/mol = 19.3 g

Answer:

lunar eclipses have a nice day

To draw a Bohr Rutherford diagram for carbon-12, we would have the symbol C in the center, with 2 electrons in the first energy level and 4 electrons in the second energy level, arranged in pairs. Each energy level would be represented by a circle around the nucleus, with the appropriate number of electrons placed in the circles.

A Bohr Rutherford diagram is a visual representation of the electron arrangement in an atom. Carbon-12 has 6 protons and 6 neutrons, which means it has 6 electrons as well since it is a neutral atom. In a Bohr Rutherford diagram, the nucleus is represented by the symbol for the element and the protons and neutrons are shown as small circles inside the symbol. The electrons are represented as dots or circles around the symbol, in the order of increasing energy levels.

In the case of carbon-12, the first energy level can hold a maximum of 2 electrons, and the second energy level can hold a maximum of 8 electrons. Therefore, the first energy level will have 2 electrons, and the remaining 4 electrons will go in the second energy level.

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The volume of the platinum solid is determined as 8.16 cm³.

The volume of the  platinum solid is calculated from its density and mass as shown below.

V = m/ρ

where;

Volume of the platinum solid is calculated as follows;

V = 175 g / 21.45 g/cm³

V = 8.16 cm³

Thus, the volume of the platinum solid is determined as 8.16 cm³.

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Answer:

1. Matter

2. Atom

3. Proton

4. Nucleus

5. Electron

6.Neutron

Transition metals

Most transition metals differ from the metals of Groups 1, 2, and 13 in that they are capable of forming more than one cation with different ionic charges. As an example, iron commonly forms two different ions

Answer:

it's answer is A

A nonspotaneous redox reaction

hope it helps you

Answer:

B

Explanation:

produce a product improve it identify a problem make a solution

Answer: A

Explanation: i just put b and it was wrong and A is the answer

Answer:

Cyclooctyne (C8H12) is the smallest cycloalkyne capable of being isolated and stored as a stable compound

Explanation:

hope this helps

The thermal energy will affect the temperature of road and increase the temperature which causes cracks on the roads after some times. Thus the construction team must use temperature resistant material.  

Thermal energy is defined as internal energy present in a thermodynamically balanced system as a result of its temperature.

It can also be defined as the energy derived from matter's temperature.

There are three types of thermal energy transfer.

Thus, the  thermal energy will affect the temperature of road and increase the temperature which causes cracks on the roads after some times. Thus the construction team must use temperature resistant material.  

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Faults and problems in three routes of compound Br(bromide) synthesis, and the most feasible route, addressing competition, compatibility, and timing.

The main course includes a nucleophilic replacement of A with MeOH within the sight of HCl, trailed by parchedness with CS₂/Mel/heat. The fundamental issue with this course is the opposition between the replacement and end responses, which could prompt low yields of the ideal item.

The subsequent course includes a comparative nucleophilic replacement of A with MeOH within the sight of TsOH, trailed by a decrease with LiAlH₄. The fundamental issue with this course is the similarity between the acidic TsOH and the diminishing specialist, which could bring about the development of undesirable side items.

The third course includes an immediate buildup of A with ethyl oxalate within the sight of K₂CO₃, trailed by a decarboxylation with H₂SO₄. The fundamental issue with this course is the planning of the decarboxylation step, which could prompt the arrangement of undesirable side items because of overcompensation.

Generally speaking, the most possible course is by all accounts the first, with cautious advancement of the response conditions to limit the opposition among replacement and disposal responses.

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At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

So,

The balanced chemical reaction for this neutralization reaction (The first one) is:

So,

We need to first determine the number of moles of HNO3 from its volume and molarity. Then convert it to moles of NaOH using stoichiometry. Finally, use the calculated moles of NaOH and its molarity (0.100 M) to figure out the volume needed.

To determine the number of moles of HNO3, we could use the formula for molarity:

Where n is the number of moles of the solute (In this case, HNO3), and V is the volume of the solution. First, convert 20.0mL of HNO3 to L:

Now,

Moles of NaOH:

Using the stoichiometry of the reaction, we got that:

Finally, using the molarity of NaOH:

If we pass this to mL, we got:

0.00252L NaOH = 252mL.

Therefore, 252 mL of NaOH are required to neutralize the solution.

Answer:

2024.70 J

Explanation:

The heat capacity of the coffee cup calorimeter can be calculated using the following formula:

q_calorimeter = q_water + q_water_final

where q_calorimeter is the heat absorbed by the coffee cup calorimeter, q_water is the heat lost by the warm water, and q_water_final is the heat gained by the cold water.

First, calculate q_water:

q_water = m_water * c_water * ΔT

where m_water = 25.0 g is the mass of the warm water, c_water = 4.184 J/g°C is the specific heat of water, and ΔT = (40.0°C - 29.5°C) = 10.5°C is the change in temperature.

q_water = 25.0 g * 4.184 J/g°C * 10.5°C = 1057.35 J

Next, calculate q_water_final:

q_water_final = m_water * c_water * ΔT

where m_water = 25.0 g is the mass of the cold water, c_water = 4.184 J/g°C is the specific heat of water, and ΔT = (29.5°C - 20.0°C) = 9.5°C is the change in temperature.

q_water_final = 25.0 g * 4.184 J/g°C * 9.5°C = 967.35 J

Finally, calculate the heat capacity of the coffee cup calorimeter:

q_calorimeter = q_water + q_water_final = 1057.35 J + 967.35 J = 2024.70 J

So the heat capacity of the coffee cup calorimeter is 2024.70 J.

A 25.0 g sample of warm water at 40.0⁰C was added to a 25.0 g sample of water in a Styrofoam coffee cup calorimeter initially at 20.0⁰C. 2024.70 J is the heat capacity of the coffee cup calorimeter.

A physical feature of matter known as heat capacity and thermal capacity is the quantity of heat that must be applied to an object in order to cause a unit change in temperature. Heat capacity is measured in joules per kelvin (J/K), the SI unit. A broad property is heat capacity.

The particular heat capacity, which can be calculated by dividing an object's heat capacity by its mass, is the comparable intense attribute. The molar heat capacity is obtained through dividing the specific heat even by molecular weight of the substance. The heat capacity per volume is gauged by the volumetric heat capacity. The term "thermal mass" is frequently used in civil engineering and architecture to describe a building's ability to hold heat.

q calorimeter = q water + q water final

q water = m ×c water ×ΔT

q water = 25.0 g×4.184 J/g°C ×10.5°C

              = 1057.35 J

q water final = m×c of water × ΔT

q water final = 25.0 g×4.184 J/g°C ×9.5°C

                   = 967.35 J

q calorimeter = q water + q water final

                      = 1057.35 J + 967.35 J

                      = 2024.70 J

Therefore,  2024.70 J is the heat capacity of the coffee cup calorimeter.

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The molar mass we calculated, 17.92 g/mol, is much lower than the molar mass of CO2, so it is unlikely that the gas is CO2.

Rate of effusion is the measure of the speed at which a gas escapes through a tiny opening, such as a small hole or a porous barrier, into a vacuum or another region of lower pressure. The rate of effusion is determined by the average speed of the gas particles and the size of the opening through which they pass. The rate of effusion of a gas is inversely related to the square root of its molar mass, according to Graham's law of effusion.

The square root of a gas's molar mass has an inverse relationship with the rate of effusion of that gas. The rate of effusion is expressed as follows:

rate1/rate2 = sqrt(MM2/MM1)

where rate1 and rate2 are the rates of effusion of the two gases and MM1 and MM2 are their molar masses.

Using the given data, we can write:

rate1/rate2 = sqrt(MM2/MM1)

1/15 = sqrt(MM2/MMglucose)

1/12 = sqrt(MM2/MMN2)

Dividing these two equations, we get:

1/15 ÷ 1/12 = sqrt((MM2/MMglucose)/(MM2/MMN2))

4/5 = sqrt(MMglucose/MMN2)

Squaring both sides, we get:

16/25 = MMglucose/MMN2

MMglucose = (16/25) x 28 = 17.92 g/mol

The molar mass of glucose is 180 g/mol. The gas evolved from the fermentation of glucose is mainly carbon dioxide (CO2), so the molar mass of the gas is close to the molar mass of CO2, which is 44 g/mol. The molar mass we calculated, 17.92 g/mol, is much lower than the molar mass of CO2, so it is unlikely that the gas is CO2.

A possible gas that could be produced from the fermentation of glucose is methane (CH4). The molar mass of methane is 16 g/mol, which is closer to the molar mass we calculated. Therefore, the gas evolved from the fermentation of glucose could be methane.

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The ionic and net ionic equation for HCl + Mg(C2H3O2)2 ⇒ MgCl2 + HC2H3O2 is H⁺ + Cl⁻ + Mg⁺ + C₂H₃O₂⁻ → Mg⁺ + Cl₂⁻ +  H⁺ + C₂H₃O₂⁻.

Ionic equations are chemical equations that only show the ions involved in a chemical reaction. In other words, ions that combine in solution to form new substances. The ions that do not participate are referred to as spectator ions.

A net ionic equation depicts only the chemical species involved in a reaction, whereas a complete ionic equation depicts the spectator ions as well.

Thus,  H⁺ + Cl⁻ + Mg⁺ + C₂H₃O₂⁻ → Mg⁺ + Cl₂⁻ +  H⁺ + C₂H₃O₂⁻ this is the net ionic equation.

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In this question , we will have to calculate the wavelength for each of the given answer choices, the shortest wavelength is the answer .

1. n = 3 to n = 1

we will use rydberg formula for wavelength : let represent wavelength.

1/ = RH * z^2 ( 1/n1^2 - 1/n2^2) ......{n1 = 1 , n2 = 3}

1/ = RH * z^2( 1/1-1/9)

1/ = 1.09x10^7*1 (8/9)

∴ =1.03x10^-7

2. n = 2 to n = 1

1/ = RH * z^2 ( 1/1^2 - 1/2^2)

=1.09x10^7*1 ( 3/4)

1/ =8175000

∴ =1.22x10^-7

3. n = 4 to n = 1

1/ = -10218750

∴ = -9.7x10^-8

4 . n = 4 to n = 3

1/ = -529861.1

∴ = -1.88x10 ^-6

5. n = 4 to n = 2

1/ = -4768750

∴ =-4.89x10^-7

• Finally, we can see that option C is the most negative value, ,∴, = -9.7x10^-8

Answer:

1.4 g

Explanation:

Step 1: Write the balanced combustion reaction

CaC₂O₄ + 1/2 O₂ ⇒ CaO + 2 CO₂

Step 2: Calculate the moles corresponding to 3.2 g of CaC₂O₄

The molar mass of CaC₂O₄ is 128.10 g/mol.

3.2 g × 1 mol/128.10 g = 0.025 mol

Step 3: Calculate the moles of CaO formed from 0.025 moles of CaC₂O₄

The molar ratio of CaC₂O₄ to CaO is 1:1. The moles of CaO formed are 1/1 × 0.025 mol = 0.025 mol.

Step 4: Calculate the mass corresponding to 0.025 moles of CaO

The molar mass of CaO is 56.07 g/mol.

0.025 mol × 56.07 g/mol = 1.4 g

Answer:

A satellite campus or branch campus or regional campus is a campus of a university or college that is physically at a distance from the original university or college area. This branch campus may be located in a different city, state, or country, and is often smaller than the main campus of an institution.

The total collection of DNA instructions present in a cell makes up the genome.

The human genome is made up of 23 sets of chromosomes that are found within the cell's core and one modest chromosome that's found within the mitochondria. Everything a individual should develop and work is encoded in their genome.

All living things have DNA as their essential source of data. The term "genome" alludes to an organism's entire DNA.

Whereas a few genomes, like those of infections and microbes, are inconceivably little, a few genomes, like those of a few plants, can be nearly inconceivably huge.

All of an organism's genetic information is included in its genome.  It is made up of DNA (or RNA within the case of RNA infections) nucleotide arrangements. The atomic genome contains administrative groupings (see non-coding DNA), non-coding qualities.

Therefore, The total collection of DNA instructions present in a cell makes up the genome.

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