A 59.4 g sample of polystyrene, which has a specific heat capacity of 1.880 J.g ·°C , is put into a calorimeter (see sketch at right) that contains 200.0 g of water. The temperature of the water starts off at 19.0 °C. When the temperature of the water stops changing it's 27.7 °C. The pressure remains constant at 1 atm. Calculate the initial temperature of the polystyrene sample. Be sure your answer is rounded to 2 significant digits.

Mendeleev's periodic table includes all the elements that were known at the time.

The rows of the table, were called periods and each period contained eight elements that increased in atomic mass from left to right.

The columns of the table, called groups, contained elements with similar properties.

The special this about this table was, the gaps for predicted elements were left.

In this question, we are given with four statements and are asked to determine, which of the following statement is not true regarding Dmitri Mendeleev's periodic table.

Out of these four options, option number 1 is correct as the statement distribution of elements determined by electron configuration is not true regarding Mendeleev's periodic table.

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a) Partial pressures is Po2 = 8.13 atm,Pch4=3.94atm,Phe = 5.6 atm,B) Total pressure= 17.73 atm, C) mole fraction are Хо2 =0.46, xch4=0.22, xhe=0.32.

mole fraction are Хo2 =3.3/3.3+ 16 + 2.3,Хо2 =0.46, xch4=0.22, xhe=0.32. Xo2 = no2/no2 + nch4 + nhe, total pressure = 8.13+3.94+5.6=17.73 atm. The pressure applied by a solitary gas in a combination is did refer to as its partial pressure. Presuming we get a combination of ideal gas law, we could use ideal gas equation to resolve issues involving gases inside a mixture. Partial Pressure can be defined as if a canning jar filled with far more than one gas, evey gas enforces pressure. The pressure of any gas enclosed within in the container is regarded to as its partial pressure. The number of molecules of a special component in a mix divided by the total amount of moles in the given medium is symbolised by the mole fraction. It's a means of expressing a solution's concentration.

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Among the given radiations, the one with shortest wavelength, highest energy and highest frequency is ultraviolet radiation.

Electromagnetic spectrum is the arrangement of different radiations in  the order of decreasing wavelength or increasing frequency. The wavelength of an electromagnetic wave is inversely proportional to the frequency and energy.

Thus, as the frequency increases energy of the wave increases and wavelength decreases. The order of waves in the decreasing order of wavelength is, radio waves, microwaves, infrared, visible, ultraviolet, x-ray and gamma ray.

Thus, among the given radiation, the highest energy, highest frequency and shortest wavelength is ultraviolet radiation.

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According to the given statement 5 °C temperature change is observed.

The variation in heat is measured by a calorimeter. A metal water container placed above an exhaust gases serves as the basic component of a calorimeter. The amount of water's temperature change is measured using a thermometer.

The calorimeter burns a 1.221g sample.

The calorimeter contains 1.240 kg of water .

The calorimeter has a heat capacity of 1365 j/°C.

∆H rxn = -3227 kj/mol of benzoic acid

Given: 1.221 g is the mass of the benzoic acid

Benzoic acid's molecular weight is 122.12 g/mol.

122.12 g benzoic acid = 1 mol

1.221 g benzoic acid =1.221/122.12= 0.0099 moles

When burned, 1 mol of benzoic acid releases 3227 kj of energy.

Burning 0.0099 moles of benzoic acid produces energy

= 3227kj×(0.0099mols)/1 mol =32.2647 kj =32264.7 j

The calorimeter absorbed thermal energy

= 1365 j/C ×T

Water absorbs heat

= m× C× T

= 1240 g( 4.18 j/gC ) ×T

= 5183.2j/C×T

the total amount of heat absorbed

= 1365T + 5183.2T

=6548.2T

6548.2T=32264.7

T= 4.92 deg.C

T= 5 °C

The result is a 5 °C temperature change.

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The number of photons that are in the light is obtained as  133 photons.

We know that the photons are the particles of light and that we can be able to obtain the energy of the photons. Let us note that the photons also have a given wavelength which can be able to calculate with the formula for the energy of the photon.

An adaptation of the Plank's equation that has to do with the wavelength of the wave can be given by the use of the formula;

E = nhc/λ

E = energy

n = Number of photons

h = Plank's constant

c = Speed of light

λ = wavelength

Then we have;

n = Eλ/hc

n =  4.0 x 10^-17 * 600 * 10^-9/6.6 * 10^-34 * 3 * 10^8

n = 2.4 * 10^-23/1.98 * 10^-25

n = 1.33 * 10^2

n = 133 photons

There are 133 photons present

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Atomic number of Technetium is 43, Mass number is 99  and symbol is Tc ,hence symbol of isotope is  99 m43 Tc

General representation of atom is AZ X

Where ,  A is mass number , Z is atomic number and X is symbol of element. Atomic number of Technetium is 43, Mass number is 99  and symbol is Tc ,hence symbol of isotope is  99 m43 Tc ,Where m stands for meta stable.

A chemical element with the atomic number 43 and the symbol Tc is known as technetium. It is the lightest element whose radioactive isotopes are all present. Technetium is a synthetic element that is created in abundance. The most prevalent source of naturally occurring technetium is uranium and thorium ores, where it spontaneously fissions as a byproduct, while molybdenum ores produce it as a byproduct of neutron capture. This crystalline, silvery-gray transition metal in group 7 of the periodic table is sandwiched between rhenium and manganese, and its chemical characteristics fall somewhere in the middle of the two nearby elements. Only in traces, 99Tc is the most prevalent naturally occurring isotope.

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The mass (in grams) of HNO₃ that reacted to produce 151.75 grams of H₂O is 531.125 grams

We shall consider the balanced equation to obtain usefull information.

2HNO₃ + Ca(OH)₂ → Ca(NO₃)₂ + 2H₂O

From the balanced equation above,

36 grams of H₂O were produced from 126 grams of HNO₃

With the above information, we can determine the mass of HNO₃ that reacted to produce 151.75 grams of H₂O. Details below:

From the balanced equation above,

36 grams of H₂O were produced from 126 grams of HNO₃

Therefore,

151.75 grams of H₂O will be produce from = (151.75 × 126) / 36 = 531.125 grams of HNO₃

Thus, the mass of HNO₃ that reacted is 531.125 grams

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An example of human intervention in the genes is; humans breed dogs to be smaller and more friendly. Option A

We know that the gene is the unit of inheritance that can be found in the chromosome of the organism. The genes that the organism does have is what would tell must the observed traits of the organism and this is called the phenotype of the organism.

We know that human's do have an impact with the fact that the genes can spread in an organism. In many cases, we can see the alteration of the genes when we deal with the genetic make up of the pets.

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A ring of C3H5 makes up the structure of a chemical with the empirical formula C5H8O that passes the iodoform test and does not discolor permanganate.

C5H8O → 1/2 (C5H12-C5H8) = 1/2(4)=2 carbons CH3C=O

No C=C after a negative permanganate test

Has a C=O bond

Methyl ketone as it tested positive for iodoform

C3H5 = ring

A cyclopropyl group is a chemical structure produced from cyclopropane that may take part in cycloadditions and rearrangements of cyclopropane in organic processes. The group contains a chemical link from each of the three carbons to both of the other two, and its empirical formula is C3H5.

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The decomposition of H2O2 is represented by the equation above. the reaction us thermodynamically favorable 4H₂O₂ → 4H₂O + 2O₂

The following diagram illustrates how hydrogen peroxide decomposes chemically;

2H₂O₂ → 2H₂O + O₂

As a result, one oxygen molecule and two water molecules result from the breakdown of two hydrogen peroxide molecules.

Numerous chemical substances spontaneously react with molecular oxygen to produce peroxides in the form of free radicals.

Given that there are four hydrogen peroxide molecules breaking down in the diagram, we have;

4H₂O₂ → 4H₂O + 2O₂

The results of the breakdown of the four molecules of hydrogen peroxide are depicted in the accompanying diagram.

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Since CH3CH2CH2NH2 may form intermolecular hydrogen bonds, it has a higher boiling point than other compounds. The hydrogen atoms in (CH3)3N (C H 3) 3 N are joined to the carbon atoms.

Since carbon is not a particularly electronegative atom, it cannot donate hydrogen. There aren't any hydrogen atoms to accept, despite the fact that nitrogen is a strong hydrogen atoms. As a result, CH3CH2CH2CH3 is a nonpolar molecular complex in which induced dipole forces are the only intermolecular forces. When both the donor atom, D, and the acceptor atom, A, are among the highly electronegative elements O, N, or F, hydrogen bonding occurs, as shown by the symbol D-H—-A.

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Both I and II are true statements. The melting point of a solid is the temperature at which solid changes from a solid to a liquid.

Molecular solids are composed of molecules held together by weak intermolecular forces, such as dipole-dipole interactions, hydrogen bonds, and London forces.

These types of bonds are weaker than the ionic bonds that are present in ionic solids, which is why molecular solids have lower melting points than ionic solids.

In addition, the shape of the molecule will influence its melting point or boiling point. For example, molecules with a higher surface area will have a higher boiling point than molecules with a lower surface area.

This is due to the increased surface area leading to increased intermolecular forces and a higher boiling point.

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Both I and II are true statements. The melting point of a solid is the temperature at which solid changes from a solid to a liquid.

Molecular solids are composed of molecules held together by weak intermolecular forces, such as dipole-dipole interactions, hydrogen bonds, and London forces.

These types of bonds are weaker than the ionic bonds that are present in ionic solids, which is why molecular solids have lower melting points than ionic solids.

In addition, the shape of the molecule will influence its melting point or boiling point. For example, molecules with a higher surface area will have a higher boiling point than molecules with a lower surface area.

This is due to the increased surface area leading to increased intermolecular forces and a higher boiling point.

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D ) The answer that best depicts the diagnostic cleavage that is typical of the mica group of minerals which include muscovite and bietet is a single, planar cleavage .

Cleavage is the splitting of minerals along natural planes of weakness

When there is only one cleavage plane, a single, planar cleavage known as the basal or pinacoidal cleavage takes place. cleaved at the base of the graphite. Mica (like muscovite or biotite) has basal cleavage, that's why mica can be peeled into thin sheets.

So single planar cleavage is answer of this question.

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Taking into account the ideal gas law, the number of moles of carbon dioxide is 0.119 moles.

An ideal gas or theoretical gas is a set of separate gaseous molecules separated from each other in such a way that no intermolecular forces are exerted between them.

The ideal gas condition normally occurs at low pressures and high temperatures, which allows each particle to be far from each other so that they do not interact.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P×V = n×R×T

Where:

In this case, you know:

Replacing in the ideal gas law:

2 atm× 2 L= n×0.082 (atmL)÷(molK)× 410 K

Solving:

[2 atm× 2 L]÷ [0.082 (atmL)÷(molK)× 410 K]= n

0.119 moles= n

Finally, the number of moles is 0.119 moles.

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8 hours  is the half-life of the radioactive iodine. The entire body is exposed to radiation risks from gamma rays. They can swiftly get through defences that alpha and beta particles can stop.

Like skin and clothing. Because of their powerful penetrating power, gamma rays may require several inches of a heavy substance, like lead, or even several feet of concrete, to be stopped. During radioactive decay, an atom's nucleus may emit gamma rays. They can easily penetrate the human body and travel tens of yards or more through the air. It takes a radioactive heavy, dense material, such several inches of lead or concrete, to shield this particularly penetrating form of ionising radiation.

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Zinc reacts with hydrochloric acid is the correct observation of a chemical property and the right response to the question above.

Equation:

Zn +2HCL  →    ZnCl2 +H2

Balanced equation:  

 Zn +2HCL  →     ZnCl2 +H2

Atomic number 30 and the letter Zn identify zinc as a chemical element. When the oxidation is eliminated, zinc becomes shiny-greyish and becomes a somewhat brittle metal at normal temperature.

Zinc is a crucial trace element for all living things, including humans, animals, plants, and microbes. After iron, it is the trace metal found in humans in the second-highest concentration. As a crucial cofactor for several enzymes, zinc is also a crucial vitamin for development. Many disorders can be caused by a zinc shortage. slowing in growth, infection susceptibility, and diarrhea are among effects of deficiency in children. . Consuming too much zinc can result in copper shortage, ataxia, and sluggishness.

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Answer:

In individuals with asthma, the airways (bronchial tubes) that carry air in and out of the lungs become narrowed, swollen, and inflamed due to an overactive immune response. This can lead to difficulty breathing, wheezing, coughing, and other symptoms.

During an asthma attack, the muscles around the airways may become tight and the lining of the airways may produce excessive mucus, further narrowing the airways and making it difficult for oxygen to reach the cells in the body. This can lead to low oxygen levels in the blood and cause symptoms such as shortness of breath and chest tightness.

In addition to these physical changes in the airways, individuals with asthma may also have an overactive immune response to certain triggers, such as allergens or irritants, which can further worsen inflammation and airway narrowing.

Treatment for asthma typically involves using medications to control inflammation and relax the muscles around the airways, as well as avoiding triggers that can worsen symptoms. By properly managing their asthma, individuals with the condition can often lead normal, active lives.

Explanation:

The tubes that carry air into and out of the lungs become irritated and constricted in people with asthma. This can make it difficult for air to enter and exit the lungs, which can cause symptoms including coughing, wheezing, and breathing problems.

Being less able to enter the lungs and reach the body's cells is one-way oxygen molecules can interact differently with the systems and cells in people with asthma. It is more difficult for oxygen to enter the lungs when the airways are constricted, which can result in a reduction in the amount of oxygen reaching the body's cells. This may cause symptoms including trouble breathing and difficulty engaging in physical activity.

In people with asthma, oxygen molecules can also affect the cells and systems in different ways by inducing an immunological reaction. When allergens or pollutants are breathed by asthmatic patients, their immune systems may be overly sensitive to them and may respond inappropriately. This may result in the release of inflammatory substances, which may further constrict the airways and hinder the absorption of oxygen by the lungs.

Inflammation and immune system overactivity can generally disrupt how oxygen molecules interact with the body's processes and cells in people with asthma, which can cause breathing problems and other symptoms.

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To solve such we need to have concept of spontaneity. The terms "feasible" and "likely" are both used to describe spontaneous processes. Therefore, second reaction will occur spontaneously.

The word "spontaneity" refers to a process's viability. A process is referred to as spontaneous if it can occur either on its own or as the result of some initiation under a certain set of circumstances. In other terms, a spontaneous process is one that may happen on its own, without any outside intervention.

For a reaction to be spontaneous, the value for ΔG should be negative and for that cell potential should be positive value according to following equation.

ΔG=-nFE

ΔG = Gibbs's free energy

E= cell potential

F= 96500

n= number of electron

Therefore, second reaction will occur spontaneously.

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Answer:CH

3

​

CH

2

​

CH

2

​

C≡C−CH

3

​

Explanation:

The reaction is given :    ²³⁴Pa₉₁  ----->   X  +   ⁰e₋₁ , the equation is balanced and the nucleus represented by X is ²³⁴U₉₂.

The balanced reaction is given as :

²³⁴Pa₉₁  ----->   X  +   ⁰e₋₁

This reaction is the balanced reaction and X is represented the nucleus and is given as :  ²³⁴U₉₂.

The given reaction is the nuclear reaction. the nuclear reaction is the reaction in which the nuclides are produced by the collision between the two atoms nuclei. the nuclear reaction are of the two types the nuclear fission and the nuclear fusion reaction. the nuclear fission is the splitting of the large nuclei in to the smaller ones.

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Answer: True. Voltaic cells, also known as galvanic cells, are able to provide energy in the form of electricity because the potentials of their redox reactions permit electrons to flow spontaneously. Redox reactions involve the transfer of electrons from one species to another, and the flow of electrons through a circuit can be used to do work, such as powering an electric motor or a lightbulb. The potential difference between the two half-cells in a voltaic cell is called the cell potential, and it determines the direction and magnitude of the flow of electrons.

Explanation:

A short circuit can cause ​giant spark ,because there is nothing in the circuit to limit the current and absorb the electrical energy. Heat builds up quickly in the wire and power supply. (Lesson 4.05) an explosion a release of harmful chemicals a fire All of the above

What is Circuit?

The point where the electrons enter the electrical circuit is known as the source, and the point where they depart is known as the return. Let's do a little experiment; you'll require the following:

Electrical tape, wire, and electric bulbs

power source

Only when there is at least one closed loop running from the positive to the negative end of the circuit is it considered complete. This is the most basic type of electrical circuit. A television's internal circuit is more intricate and made up of several parts

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2 remedies a seller has under the UCC when the buyer has breached and the seller still possesses the goods are that he can cancel the contract or withhold the delivery.

By contract, what did you mean?

An agreement between parties that establishes legal duties for both parties is known as a contract. Mutual consent, demonstrated by a valid offer and acceptance, sufficient consideration, capability, and legality are the fundamental components needed for the agreement to be a legally enforceable contract.

Contract with example: What is it?

A commitment made by one party to another that they will or won't take a particular action in the future. As an illustration, I'll offer you $3,500 to buy your car. An acceptance.

Therefore, it usually reflects the conditions of the offer—an indication, through speech or action, that both parties accept the terms of the contract.

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Label for each of the compounds given in the question are: 1) Isomer, 2) Isomer, 3) Resonance Structure, 4) Isomer 5) Neither.

A group of two or more Lewis structures known as resonance structures describe the electronic bonding of a single polyatomic species, including fractional bonds and fractional charges. The number of electrons in resonance structures should be constant; do not add or subtract any electrons. (Count the electrons to determine their number). Every resonance structure complies with the standards for writing Lewis Structures. Structure hybridization must be constant. By cyclically moving elections, it is possible to depict the two resonance configurations of the benzene ring. Multiple resonance structures can be found in conjugated double bonds.

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The Nernst equation and the link between the standard cell potential and free energy can be used to determine the equilibrium constant of the redox process in an electrochemical cell.

The ratio of the product concentration to the reactant concentration is the equilibrium constant. a fixed value for a certain reaction at a specific temperature. The letter "c" denotes the expression of the equilibrium constant in terms of concentrations.

The standard cell potential, temperature, reaction quotient, and the cell potential of an electrochemical cell are all related by the Nernst equation. The Nernst equation can be used to determine the cell potentials of electrochemical cells even under unusual circumstances.

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If the reaction is exothermic as described, a rise in temperature will thus trigger the opposite reaction, which will result in a decrease in the amount of the products and an increase in the number of reactants. The reverse outcome will occur if the temperature is lowered.

B. The concentration of the products increases.

A reaction is defined as exothermic if the overall standard enthalpy change (H) is negative. Exothermic processes typically produce heat. Exergonic reaction, which the IUPAC defines as "... a reaction for which the overall standard Gibbs energy change G is negative," is frequently mistaken with the phrase.

Because "H" contributes significantly to "G," a strongly exothermic process is typically also exergonic. Exothermic and exergonic chemical reactions make up the majority of the impressive demonstrations in schools.

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Based o the percentage masses of the elements, the empirical formula of epinephrine is C₉H₁₃O₃N.

The empirical formula of epinephrine is calculated below as follow:

Mole ratio of the elements are determined:

Carbon = 59% / 12

Carbon = 0.049 moles

Hydrogen = 7.1% / 1

Hydrogen = 0.07 moles

Oxygen = 26.2% / 16

Oxygen = 0.016

Nitrogen = 7.7% / 14

Nitrogen = 0.0055

The simplest whole-number ratio will be:

C = 0.049/0.0055

C = 9

Hydrogen = 0.07/0.0055

H = 13

Oxygen = 0.016/0.0055

Oxygen = 3

Nitrogen = 0.0055/0.0055

Nitrogen = 1

The empirical formula = C₉H₁₃O₃N

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The ΔH of the reaction for the formation of graphite from diamond is equal to -1.9 KJ/mol.

The heat of formation can be described as the amount of heat absorbed or evolved when 1 mole of a substance is formed from its constituent elements, each substance being in its normal physical state.

We have to rearrange the provided equations in a way in which all molecules of O₂ and CO₂ can be eliminated:

2C (diamond) + 2O₂ (g) → 2CO₂ (g)     ΔH₁= 2 × (-395.4 KJ)

2 CO₂ (g) → 2 CO(g) + O₂(g)            ΔH₂ = 566.0 KJ

CO₂(g) → C (graphite) + O₂(g)          ΔH₃= - 1 × (-393.5 KJ)

2CO (g) → C (graphite) + CO₂(g)      ΔH₄= -172.5 KJ

When we eliminate the molecules that appear both in reactants and products, the total chemical reaction is the following:

2C (diamond) → 2C (graphite)

ΔH (total) = ΔH₁ + ΔH₂ + ΔH₃ + ΔH₄

ΔH (total) = 2 × (-395.4 KJ) + 566.0 KJ + (-1 × (-393.5 KJ)) - 172.5 KJ

ΔH (total) = 347.2 KJ

This is for 2 mol of C (diamond) which is converted into 2 mol of C (graphite). To find ΔH for the reaction of 1 mol C (diamond) to 1 mol (graphite) we have to divide it into 2:

ΔH = - 3.8/2 = -1.9 KJ/mol

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As per the given balanced reaction, one mole or 63.5 g of Cu produces 2 moles or 215.6 g of silver metal. Hence, 5 g of copper produces16.9 g of Ag.

A displacement reaction is a type of reaction, in which one element or group of the reactant is displaced by the attacking group or element. The reaction between copper and silver nitrate is an example of single displacement reaction.

Given the balanced equation  of the reaction. One mole of Cu produces 2 moles of Ag.

atomic mass of Cu = 63.5 g/mol

atomic mass of Ag = 107.8 g/mol

mass 2 moles of Ag = 2 × 107.8 =215.6 g.

Hence, 63.5 g of Cu produces 215.6 g of Ag.

The mass of Ag produced by 5 g of Cu is calculated as follows:

mass of Ag = (5 × 215.6 g) /63.5 g = 16.9 g

Therefore, the mass of silver precipitated will be 16.9 g.

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Answer:

Metals react with water to form oxides or hydroxides and release Hydrogen gas

Explanation: