A balloon is inflated to 4.50 L with nitrogen gas, N2, at a particular initial temperature and pressure, and tied-off. Assume that the temperatures and pressures referred to are always those prevailing inside the balloon.

To what volume will the balloon contract or expand when:

1. The pressure is reduced to one-half the initial value and the Kelvin temperature is reduced to one third of the initial value?

2. The pressure is reduced to one third of the initial value and the Kelvin temperature is doubled?

The pH and pOH of a substance with concentration of 5 × 10-⁵M is 4.30 and 9.70 respectively.

pH is a figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.

pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water. pH is an important indicator of water that is changing chemically. pH is reported in "logarithmic units". Each number represents a 10-fold change in the acidity/alkalinity of the water.

The pH of a solution can be calculated by using the following expression:

pH = - log {H}

pH = - log {5 × 10-⁵}

pH = 4.30

pOH is a measure of the hydroxide ion concentration of a solution. As such, it can be used as an indicator of a substance’s alkalinity or even its electrical conductivity in some cases. The pOH is the negative logarithm of the hydroxide ion content and can be calculated by the expression:

pOH = 14 – pH

pOH = 14 - 4.30

pOH = 9.7

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Answer:

200 (kg / mol) x dL

Explanation:

As per the balanced reaction, 3 moles of calcium hydroxide produce 2 moles of aluminium hydroxide and 3 moles of calcium sulphate. The number of moles of calcium sulphate to produce 1.40 moles of aluminium hydroxide is 2.1 moles. Thus 2.1 moles of calcium sulphate will be produced.

Calcium sulphate is an inorganic compound formed from reaction of calcium hydroxide with any sulphates. The balanced equation of the given reaction is written as:

[tex]\rm Al_{2}(SO_{4})_{3} + 3Ca(OH)_{2} \rightarrow 2 Al(OH)_{3} + 3 CaSO_{4}[/tex]

As per the balanced reaction,  3 moles of calcium hydroxide  2 moles of aluminium hydroxide.Given that 1.40 moles of aluminium hydroxide is produced. The number of moles of calcium hydroxide required for these much product is:

= (1.40 × 3) 2 = 2.1.

3 moles of calcium hydroxide produce 3 moles of calcium sulphate. Thus, 2.1 moles gives 2.1 moles of product. Hence, number of moles of calcium sulphate produced is 2.1 moles .

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5 ×10^-10 equilibrium constants indicates the reaction that  gives the greatest amount of reactant.

At equilibrium, the forward and reverse reaction rates are equal, resulting in constant concentrations for all of the chemicals. Given that, it seems sense that the ratio of concentration for any given reaction at equilibrium will always keep a constant value.

The ratio of the mathematical product of a reaction's products to that of the concentrations of its reactants is known as the equilibrium constant (Keq). The balanced chemical equation raises each concentration to the power of its corresponding coefficient. K=1 when equilibrium attains. It has no units.

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C-F  bonds is likely to have the least ionic character

Ionic bond type is the linkage formed from the electrostatic attraction between oppositely charged ion in a chemical compound and if the electronegatively differences between two atom is high and there will be a more ionic character to the bond and if the electronegativity differences between the two atom is low and there will be less ionic character to the bond and therefore the smallest electronegativity differences means least ionic character will be found between O-F then C-F and H-f and finally the greatest electronegativity differences will be between Na-F is most

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When the Carbon reacts with oxygen it produce CO₂. This can be depicted by the below equation.

C + O₂ → CO₂. By the given process, 57.2 g of CO₂ are produced.

It has been mentioned that when 15.6 g of C reacts with 52.1 g of O₂  , then 10.5 g of O₂ remains unreacted. It indicates that Carbon is the limiting reagent and hence the amount of CO₂ produced is based on the amount of Carbon burnt.

C + O₂ → CO₂

In the given equation , 1 mole of carbon reacts with the  1 mole of O₂ to produce 1 mole of CO₂.

In the case 15.6 g of Carbon reacts with 52.1 of O₂ to produce the  "x" g of CO₂.

No of moles of a substance = mass of  the substance/molar mass of  substance

No of moles of carbon = 15.6 /12= 1.3 moles

No of moles of O₂ = Mass of reacted O₂/Molar mass of O₂.

No of moles of O₂ = (Total mass of O₂ burned - Mass of unreacted O)/32

No of moles of O₂ = (52.1-10.5) ÷ 32 = 1.3 moles.

Hence as already discussed 1 mole of Carbon reacts with 1 mole of O₂ to produce 1 mole of CO₂. In this case 1.2 moles of carbon reacts with 1.3 moles of O₂ to produce 1.3 moles of CO₂.

Moles of carbon dioxide = Mass of CO₂ produced /Molar mass of CO₂

Mass of CO₂ produced(x) = Moles of CO₂ ×Molar mass of CO₂

Mass of CO₂ produced(x) = 1.3 x 44 =  57.2 g

Thus 57.2 g of CO₂ is produced.

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The ground state electron configuration for the monoatomic ion is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6.

A monoatomic ion is an ion that contains only one atom. We can be able to form an ion by the addition or by the removal of an electron from the atom. We form a positive ion by the removal of an electron and we form a negative ion by the addition of an electron.

Now we have the element that is called selenium (Se) the ion that is formed by this element is Se^2-. Selenium is able to form a monoatomic ion when it gains two electrons. The electron configuration of this ion is; 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6.

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The molarity of the acid is the 64.3dm³

Molarity is the amount of a substance in a certain volume of solution

Here given data is

25 cm³ of a solution of 0.1 mol dm-³ NaOH reacts with 51.5 cm³ of a solution of hydrochloric acid

We have to calculate molarity = ?

So the molarity = number of moles of solute/volume of solution in L or dm³

1. 25 cm³ = 1.25ml = volume

Molarity =  51.5 cm³ × 1.25ml

Molarity = 64.3dm³

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The volume of toluene had been collected is 79.8L

Steam distillation is a process used for the recovery of volatile compounds with high boiling points and from inert and complex matrices solid and liquid using saturated or superheated steam as separation and energy agent

Here a student performed a steam distillation of toluene and water

So we have to calculate the volume of toluene = ?

So density = mass/volume

Rearranging the formula

Volume = mass × density

So mass of toluene = 92.14g/mol

Density of toulene = 867kg/m³

So Volume = mass × density

Volume = 92.14g/mol×867kg/m³

Volume = 79.8L

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Answer: In one type of combination, called negative,or N-type,the impurity causes the germanium or silicon to emit free electrons. Arsenic, bismuth, and antimony are suitable impurities for this purpose.

Explanation:

Answer:

0.11 m

Explanation:

H Ci + NaOH H2 O+ NaC1

by titration

0.0025 L of 0.13 mol Na OH = 0.00325 Mol NaOH

L

0.00325 Mol NaOH 1 Mol Hcl/I Mol NaOH = 0.00325 Mol hcl

now 0.00325 mol Hcl/ 0.030 L = 0.0108 M hcl

If Huda sees an obvious set of fingerprints on a mirror at a crime scene, the way in which she could best preserve this evidence is to: C. use clear tape to lift the prints.

In English language, an evidence can be defined as a collection of factual information that comprises empirical statistics and analysis, which are typically used to show or prove that an action, event, message, etc., is credible, reliable, truthful, and verified.

In Forensics, there are different types of evidence that are used in combatting crimes and these include the following:

Additionally, it is very important and essential that forensic experts and scientist preserve any evidence that is seen or obtained from a crime scene, especially by choosing the most efficient and effective technique (method) such as using a clear tape to lift set of fingerprints on a mirror.

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Answer: C

Explanation:

Chlorine and Aluminum atoms shielding effect on their outer electrons is in chlorine there is 7 electron and in aluminum there is poor shielding effect so the greater size of aluminum

An electron is the s sublevel shied electron present in the p sublevel of the same principal energy level and the electron shielding refer to the blocking of valence shell electron attraction by the nucleus due to the presence of inner shell electron and electron in an s orbital can shielding p electron at the same energy level because of the spherical shape of the s orbital and valence electron are the number of electron present in the outermost shell of an atom and now the last shell of the chlorine atom has 7 electron in it and in aluminum there is poor shielding effect so the greater size of aluminum

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The speed that reflects the average kinetic energy of the molecules is known as the root-mean-square speed. using N2 at 25 °C.

The square root of temperature and the square root of the molar mass are both exactly proportional to the rms velocity. Thus, doubling the rms velocity of the molecules when the temperature of a specific gas is quadrupled.

The root mean square velocity of gaseous hydrogen molecules equals that of oxygen molecules at 47°C at what temperature.

A gas will effuse more quickly the lighter it is; conversely, the heavier a gas is ,the slower it flows, the more. Helium (He) will have the highest rate of effusion since it has the lowest molecular weight (atomic weight, in this example).

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The mass of antimony present in the sample is 1.65 g

The percentage mass of antimony in the sample is 20.7%.

The number of moles of antimony present in the sample is determined from the mole ratio of the reaction.

The mole ratio of the reaction is obtained from the balanced equation of the reaction as follows:

Balanced equation of the reaction:

BrO₃⁻ (aq) + 3 Sb³⁺ (aq) + 6 H⁺ ⟶ Br⁻ (aq) + 3 Sb⁵⁺ + 3 H₂O

moles of KBrO₃ in the 34.8 mL of a 0.130 M aqueous solution of KBrO₃ is determined as follows:

Moles of KBrO₃ = 0.13 * 34.8/1000

Moles of KBrO₃ = 0.004524 moles

1 mole of  KBrO₃ reacts with 3 moles of Sb³⁺

Moles of Sb³⁺ reacted = 0.004524 * 3

Moles of Sb³⁺ reacted = 0.13572 moles

The mass of antimony present = moles * molar mass

Molar mass of antimony = 121.76 g/mol

Mass of antimony = 121.76 * 0.13572

Mass of antimony = 1.65 g

Percentage mass of antimony = (1.65/7.97) * 100%

Percentage mass of antimony = 20.7%

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The formula to find the mass in grams is =  number of moles × Molecular mass

A mole is defined as 6.02214076 × 1023 of the chemical unit, be it atoms, molecules, ions, or others as well. The mole is a convenient unit to use because of the great number of atoms, molecules, or others that are present in any substance.

To find number of moles we use the formula that is weight divided by molecular mass

From this we can find out the mass as well;

Mass = Number of moles × Molecular mass

Mass = 3.6 × 98.070 ⇒ 353.08 grams

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answer : 2.02 J/g°C

Answer:

Below

Explanation:

specific heat cap =  j / (gm c)

                = 47.5 / (13.2 *1.72) = 2.09   j / (gm-c)   or   = 2093 j/(kg-C)

Heat capacity  =  47.5 / 1.72 = 27.6 J / C

Answer:

53.7 L

Explanation:

The volume occupied by 35.2 g of methane gas at 25 °C and 1.0 atm. is 55.9 L.

Given to us is temperature, pressure, universal gas constant, and mass of methane gas, we need to find the volume occupied by the gas.

To calculate the volume occupied by the methane gas, we can use the ideal gas law equation:

PV = nRT

Where:

P = pressure (in atm)

V = volume (in liters)

n = number of moles

R = ideal gas constant (0.08206 Latm/(Kmol))

T = temperature (in Kelvin)

First, we need to convert the given temperature from Celsius to Kelvin:

T(K) = T(°C) + 273.15

T(K) = 25 °C + 273.15

T(K) = 298.15 K

Next, we calculate the number of moles of methane gas using its molar mass:

molar mass of CH₄ = 12.01 g/mol + 4(1.008 g/mol) = 16.04 g/mol

n = mass/molar mass

n = 35.2 g / 16.04 g/mol

n = 2.19 mol

Now we can substitute the values into the ideal gas law equation:

PV = nRT

V = (nRT) / P

V = (2.19 mol × 0.08206 Latm/(Kmol) ×298.15 K) / 1.0 atm

V = 55.9 L

Therefore, the volume occupied by 35.2 g of methane gas at 25 °C and 1.0 atm is 55.9 liters.

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The formal charge that is carried by the carbon atom is +1.

Let us recall that the formal charge is defined as the charge that an atom in a compound appears to  have. We know that the formal charge can be obtained by the use of the formula;

Formal Charge = [# valence electrons on neutral atom] – [(# lone electron pairs) + (½ # bonding electrons)]

Now applying this formula to the specie that we have here it would become;

Formal Charge = (4 - 0) + 1/2(6)

Formal Charge = 4 - 3

Formal Charge = 1

It then follows that the formal charge that would appear on the specie is +1 as shown in the image attached here.

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We cannot predict whether a spatial object is a star or a planet based on just its mass. However, Jupiter is already proven to be a planet which revolves around the sun. Thus we can't agree to the statement.

Stars are spatial things with light energy formed by gases and dust particles. They are stationary at a position in the universe. They can form groups with other stars called constellations in various shapes which are connected by the force of attraction.

Planets are revolving around a star such as in solar system, where, 8 planets including earth and Jupiter. Jupiter is the biggest planet in the solar system and it is not star.

Therefore, Jupiter is not a star and the statement is false.

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In the following reaction HCO³⁻(aq) + H₂O(l) →CO₃²⁻ (aq) + H₃O⁺ (aq) is H₂O is a base and CO₃²⁻ is its conjugate acid

Whenever an acid donates a proton and the acid changes into a base and whenever a base accept a proton and an acid is formed an acid and base which differ only by the presence or absence of a proton are called a conjugate acid base pair so in the reaction

HCO³⁻(aq) + H₂O(l) → CO₃²⁻ (aq) + H₃O⁺ (aq)

H₂O is a base and CO₃²⁻ is its conjugate acid

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It is the simplest whole number ratio of elements in a compound. Molecular formula is n times the empirical formula where n is integers 1,2,... The empirical formula is BH2N.

Empirical formula gives the proportion of the element that is present in a compound. It does not give information about the actual number or the arrangements of the atoms.

n= molecular formula÷ empirical formula

Molecular formula =B[tex]_3[/tex]H[tex]_6[/tex]N[tex]_3[/tex]

Molecular formula = 3×BH2N

Molecular formula =3×empirical formula

Empirical formula = BH2N

Therefore, the empirical formula for this compound B[tex]_3[/tex]H[tex]_6[/tex]N[tex]_3[/tex] is BH2N.

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sutures are nonmoving joints that connect bones of the skull. These joints have serrated edges that lock together with fibers or connective tissue.

There are 5 oxygen atoms in one nitrogen pentoxide. The number of oxygen atoms in one mole of nitrogen pentoxide is 3.01 × 10²⁴.

Any  substance containing 6.022 × 10²³ atoms is called one mole of the substance. This number is called Avogadro number. Hence, one mole of every element contains Avogadro number of its atoms.

One mole oxygen contains 6.022 × 10²³ oxygen atoms. Similarly one mole of a compound contains 6.022 × 10²³  number of its constituent molecules.

Now, the number of oxygen atoms in one mole of N₂O₅ will be 6.022 × 10²³ × 5 = 3.01 × 10²⁴. Therefore, option b is correct.

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Mole measure the number of elementary entities of a given substance that are present in a given sample. 6.02 x 10²³ oxygen atoms are

present in one mole of dinitrogen pentoxide N[tex]_2[/tex]O[tex]_5[/tex]. The correct option is option 4.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance.

One mole of any substance contains  6.02 x 10²³ number of  atoms. 6.02 x 10²³ is called Avogadro number. Mole is inversely proportional to Avogadro number.

Therefore,  6.02 x 10²³ oxygen atoms are present in one mole of dinitrogen pentoxide. The correct option is option 4.

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If a certain piece of metal is cooled it will conduct current better is a hypothesis.

When a conductor is connected to a fluctuating magnetic flux, it induces closed loops of electric currents known as eddy currents. They create closed circuits in a plane perpendicular to the magnetic field and are subject to Faraday's law of electromagnetic induction. These currents will flow in a direction that opposes the shift required by the Lenz law.

Eddy currents are created when a conductor is traveling through a magnetic field or when the magnetic field around a conductor at rest changes over time. They arise from variations in the strength and direction of a conductor-linked magnetic field or magnetic flux.

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Christopher is a suspect who left his bloody fingerprints on the steering wheel of his car. A forensic scientist would transfer blood stains.

The most frequent sort of bloodstain pattern found at crime scenes is impact spatter. When anything touches a blood source, it happens. The blood in impact blood spatter patterns is frequently circular rather than elongated. Impact spatter comes in two varieties are rear spatter and forward spatter.

The crime scene team used an immunochromatographic technique to identify human blood qualitatively. Such testing is meant to be used sparingly at crime scenes when the human origin of suspected bloodstains is in doubt and when it is urgent to determine if the bloodstains are of human origin.

Thus, option A is correct.

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2520 joule is the heat (q) when a student dissolves 5.00 g of CaCl₂ into 200.0 g of H₂O. The temperature changes from 25.0°C to 28.0°C.

H₂O mass=200.0 g

c of H₂O= 4.2 joules per gram

Δt=3 °C

q=mcΔt

q=200.0 g×4.2×3

q=2520 joule

mass of solution= (solute + solute)

mass of solution=5.00 g+200.0 g

mass of solution=700 g

Heat has a very precise meaning in thermodynamics that is distinct from how we typically use the word. Heat is the thermal energy that is transmitted when two systems with different surface temperatures come into contact. Heat is denoted by the letters q or Q and is measured in Joules.

Because it is defined in the context of a process through which energy can be transmitted, heat is occasionally referred to as a process quantity. We don't discuss the heat that a cup of coffee contains, but we may discuss the heat that the cup of hot coffee transfers to your hand. Another significant characteristic is heat.

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This reaction is exothermic reaction and the q value is -484 kJ

An exothermic reaction is a chemical reaction that involves the release of energy in the form of heat or light

Here given reaction is

2H2(g) + O2(g) → 2H₂O(g)

In this reaction we can see that heat is released so if heat is released after completion of the reaction such reaction are called as exothermic reaction and thus given reaction is exothermic reaction

The fuel is hydrogen it react with oxygen from the air this is an exothermic reaction

So because of exothermic reaction ΔH = -ve

That why the q value is also negative so it is q = -484 kJ

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