Only few substances can be used as natural indicators. Why?

Answer:

Temperature affects the rate of a chemical reaction because it affects the rate of motion of the reacting particles. Higher temperatures increase the kinetic energy of particles, which increases their rate of collision and reaction.

Explanation:

If the initial pressure was 400 torrs,  the pressure when this reaction is complete​ is  1000 torrs.

The given equation is 2NOBr(g) -> 2NO(g) + Br2(g)

This is a decomposition reaction, which means that the total number of moles of gas will increase.

From the balanced chemical equation, we can see that 2 moles of gas are produced for every 2 moles of NOBr consumed. Therefore, the number of moles of gas will double when the reaction is complete.

Let x be the final pressure of the gas mixture in torrs.

Initially, the pressure of NOBr is 400 torrs, and the initial pressure of NO and Br2 is 0 torrs.

When the reaction is complete, 2 moles of gas will be present for every 1 mole of NOBr initially present. Therefore, the final pressure of the gas mixture is:

x = (2 moles of NO + 1 mole of Br2) / (2 moles of NOBr) x 400 torrs

x = (2 + 1/2) x 400 torrs

x = 1000 torrs

Therefore, the pressure of the gas mixture when the reaction is complete is 1000 torrs.

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Answer:

The velocity of sound in air is dependent on several factors, including temperature, pressure, and humidity. At a temperature of 38°C (100.4°F), the average velocity of sound in air is approximately 343 meters per second (m/s). However, it is important to note that this is just an approximation and the actual velocity can vary depending on the specific conditions. To get a more precise value, you may need to consider the effect of pressure, humidity, and other factors.

Answer The reaction shown below is a chemical reaction between aqueous calcium hydroxide (Ca(OH)2) and aqueous hydrochloric acid (HCl):

Explanation:

Ca(OH)2(aq) + HCl(aq) -> CaCl2 + H2O

This reaction is an example of a neutralization reaction. Neutralization reactions occur when an acid reacts with a base to produce a salt and water. In this reaction, the hydrogen ions from the hydrochloric acid react with the hydroxide ions from the calcium hydroxide to produce calcium chloride (CaCl2) and water (H2O). The reaction results in the neutralization of both the acid and the base, hence the name "neutralization reaction."

Answer:

The molar mass of Mg2SiO4 can be calculated by adding the atomic masses of each element:

Mg: 2 x 24.31 g/mol = 48.62 g/mol

Si: 1 x 28.09 g/mol = 28.09 g/mol

O: 4 x 16.00 g/mol = 64.00 g/mol

Molar mass of Mg2SiO4 = 48.62 + 28.09 + 64.00 = 140.71 g/mol

To calculate the number of oxygen atoms in a 120.0 g sample of forsterite, we first need to calculate the number of moles of Mg2SiO4 in the sample:

n = mass / molar mass = 120.0 g / 140.71 g/mol = 0.853 mol

Next, we can use the molecular formula to determine the number of oxygen atoms in one mole of Mg2SiO4:

Mg2SiO4 has 4 oxygen atoms per molecule, so one mole of Mg2SiO4 has 4 moles of oxygen atoms.

Therefore, the number of oxygen atoms in 0.853 mol of Mg2SiO4 is:

0.853 mol Mg2SiO4 x 4 mol O / 1 mol Mg2SiO4 = 3.412 mol O

Finally, we can convert the number of oxygen atoms to a more convenient unit, such as atoms. One mole of oxygen atoms contains 6.022 x 10^23 atoms, so the total number of oxygen atoms in 0.853 mol of Mg2SiO4 is:

3.412 mol O x 6.022 x 10^23 atoms/mol = 2.055 x 10^24 atoms of oxygen

Rounding this result to 4 significant digits, we get:

2.055 x 10^24 atoms of oxygen (to 4 significant digits)

Explanation:

The balanced equation for the chemical reaction is:

NH₄NO₃ -> N₂O + 2H₂O

The balancing chemical equation is done by doing a head count of the different element present on both sides of the equation to ensure the are the equal.

This however is in line with the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

Now, we shall the balance equation as shown below:

NH₄NO₃ -> N₂O + H₂O

There are 4 atoms of H on the left side and 2 on the right side. It can be balanecd by writing 2 before H₂O as shown below:

NH₄NO₃ -> N₂O + 2H₂O

Now the equationis balanced.

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Kc = 1.10 104 for the reaction detailed below. If the reaction starts with 0.200 M A with 0.150 M B, how much is the equilibrium level of C 

What does the word reaction mean?

Chemical reaction is the transformation of one or more substances—the reactants—into one or more additional substances—the products. Chemical elements or chemical compounds make up substances.

Where do reaction take place?

The Earth's geology, the atmosphere, the oceans, and a wide variety of intricate processes that take place in all life processes are rife with chemical reactions. Physical changes and chemical must be differentiated.

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According to law of conservation of mass, if mass of product is 58.3 g the mass of nitrogen is 28 g and that of cesium nitride is 30.3 g which sums up to 58.3 g.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Mass of cesium nitride= mass of cesium + mass of nitrogen, thus, mass of nitrogen = 14×2=28 g and that of cesium is 58.3-28=30.3 g.

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The enthalpy of formation of H₂ and O₂ are zero. Then , the enthalpy of formation of water is 285 kJ.

Enthalpy change of a chemical reaction of physical change is the change in heat energy absorbed or evolved during the change or reaction. It is represented as ΔHf⁰.

The enthalpy of formation of elements in molecular state is zero. Hence the enthalpy of formation of H₂ and O₂ are zero.

The enthalpy of formation of water = -285 kJ.

enthalpy of reaction = enthalpy of products  - enthalpy of reactants.

ΔHr = -285 kJ - 0+0 = - 285 kJ.

Therefore, the enthalpy change during the formation of water from its elements is - 285 kJ.

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Your complete question is as follows:

Using tabulated ∆Hf° values in the text, determine the enthalpy change (in kJ) that occurs during the formation of water from its elements:

2 H2 (g) + O2 (g) → 2 H2O (l) ∆H = ?

There are[tex]6.02*10^{23}[/tex] atoms of nitrogen in 0.50 mol of (NH4)2CO3. The correct answer is D. [tex]6.02*10^{23}[/tex]

To determine the number of atoms of nitrogen in 0.50 mol of (NH4)2CO3, we first need to find the total number of moles of nitrogen in the compound.

(NH4)2CO3 contains two nitrogen atoms in each molecule, so the total number of moles of nitrogen is:

2 nitrogen atoms/molecule x 0.50 mol = 1.00 mol of nitrogen

We know that one mole of nitrogen contains Avogadro's number[tex](6.02 * 10^{23})[/tex] atoms of nitrogen. Therefore, 1.00 mol of nitrogen also contains [tex](6.02 * 10^{23})[/tex]atoms of nitrogen.

Therefore, there are [tex](6.02 * 10^{23})[/tex]atoms of nitrogen in 0.50 mol of [tex](NH4)2CO3.[/tex]

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Answer:

α HC2H3O2 (aq) + β Ba(OH)2 (aq) → γ H2O (l) + δ Ba(C2H3O2)2 (aq)

Explanation:

To balance the equation, you need to make sure that the number of atoms of each element on both sides of the equation are equal. The balanced equation for the reaction between α moles of acetic acid (HC2H3O2) and β moles of barium hydroxide (Ba(OH)2) to produce γ moles of water (H2O) and δ moles of barium acetate (Ba(C2H3O2)2) is:

α HC2H3O2 (aq) + β Ba(OH)2 (aq) → γ H2O (l) + δ Ba(C2H3O2)2 (aq)

Answer:

89.17 u.

Explanation:

he average atomic mass of funnium can be calculated as follows:

Atomic mass = (Relative abundance of first isotope * atomic mass of first isotope) + (Relative abundance of second isotope * atomic mass of second isotope)

Atomic mass = (50.69% * 78.92 u) + (100% - 50.69% * 80.92 u)

Atomic mass = 39.86 u + (49.31 u)

Atomic mass = 89.17 u

So, the average atomic mass of funnium is 89.17 u.

C-X bond in the compound L below are distributed in the bond cleavage to form free radical.

How do bonds break?

When a bond is broken through heterolytic cleavage, also known as heterolysis, one of the fragments still has the shared pair of electrons from the original connection. Because it has both bonding electrons, one fragment acquires an electron while the other loses one. Another name for this procedure is ionic fission.

Any molecular species that has an unpaired electron in an atomic orbital and is capable of independent existence is referred to as a free radical. Most radicals exhibit certain similar characteristics when an unpaired electron is present. Many radicals are highly reactive and inherently unstable.

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in front of H2O for balance the hydrogen atoms: CH4 + O2 CO2 + 2H2O. A 2 can be placed  Oxygen gas on the left to balance the oxygen atoms: CH4 + 2O2 Carbon dioxide + 2H2O. Now the equation balances.

The equation that balances is CH4(g)+2O2(g)CO2(g)+2H2O. (g) Methane (CH4) and oxygen (O2) combine during combustion to form carbon dioxide (CO2) and water (H2O): CO2 + 2 H2O CH4 + 2 O2 The laws of mass conservation is observed in this reaction because nothing was actually generated or destroyed, only rearranged.

According to the hierarchy of carbon atom attachments, primary carbon is only tied to one carbon atom, secondary carbon is only attachment to two carbon, tertiary carbon is only connected to carboxylic acid group, and quaternary chlorine is only linked to carbon rings.

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Number of photons emitted = 2167200 photons/second

 Photons are particles of light that are emitted from atoms. They exist in a wide range of energies and wavelengths and can be emitted from both natural and artificial sources.

Photons are emitted when an electron in an atom moves from a higher energy state to a lower energy state.

1. Number of photons emitted = (Energy conversion efficiency) × (Power in Watts) × (eV/J) × (Avogadro's number) × (1/Energy of band gap)

Number of photons emitted = (0.9) × (50) × (1.6 x 10-19/1) × (6.02 x 1023) × (1/2.0)

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The concentration at t = 300 s is  1.1 * 10^-30 M

The rate constant, also known as the reaction rate constant, is a constant of proportionality that relates the rate of a chemical reaction to the concentration of reactants. It is a measure of the speed at which a chemical reaction occurs and is dependent on temperature, pressure, and other physical and chemical factors.

The rate constant is represented by the symbol "k" and is usually expressed in units of reciprocal time, such as per second (s^-1).

We know that for the first order reaction;

ln[A] =ln [A]o - kt

[A] = final concentration at time t

[A]o = Initial concentration

k = rate constant

t = time taken

ln[A] = ln1 - 0.23 * 300

ln[A] = -ln69

[A] = e^-69

= 1.1 * 10^-30 M

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The partial pressure of the remaining air is 0.94 atm.

First, we'll convert the partial pressure of hydrogen sulfide from mmHg to kPa:

015.2 mmHg * (101.325 kPa / 760 mmHg)

= 0.020 kPa

Next, we'll find the sum of the partial pressures of carbon dioxide and hydrogen sulfide:

5.065 kPa + 0.020 kPa

= 5.085 kPa

Now we'll convert this sum to atmospheres:

5.085 kPa * (1 atm / 101.325 kPa)

= 0.05 atm

Finally, we'll subtract this sum from the total gas pressure to find the partial pressure of the remaining air:

0.99 atm - 0.05 atm

= 0.94 atm

So the partial pressure of the remaining air is 0.94 atm (to 2 sig figs).

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The term mole concept is used here to determine the moles of oxygen gas produced. When 6.50 moles of Calcium oxide decomposes, 3.25 moles of oxygen gas is produced.

One mole of a substance is that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of carbon-12.

The given reaction is:

2 CaO → 2 Ca + O2

Here 2 moles of calcium oxide decomposes to give 2 moles of calcium and 1 mole of oxygen. So 6.50 moles CaO gives:

6.50 × 1 mol O₂ / 2 mol CaO = 3.25 mol O₂

Thus 3.25 mol O₂ is produced.

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The way that using locally made goods can lower CO2 emissions is by reducing the emissions from the transport needed to take foreign made goods to a place.

The use of locally made goods can lower CO2 emissions by reducing the transportation distance needed to transport goods. When goods are manufactured and consumed locally, they do not need to be transported over long distances, which can greatly reduce the carbon emissions associated with transportation.

Transportation is a significant source of greenhouse gas emissions, particularly emissions from the burning of fossil fuels like gasoline and diesel. By reducing the amount of transportation needed, the use of locally made goods can help to lower the overall carbon footprint of an economy.

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As per the temperature, the molecules of a substance act differently. The melting point is -114.2 °C and The boiling point of hydrogen chloride (HCl) is -85.05 °C. The correct sketch in each set is as follows:

Thus, if the temperature is kept above  -85.05 °C, the molecules will be placed widely apart and will be in the gaseous state, revealing their properties.

If the temperature is between -114.2 °C and -85.05 °C, the molecules will be organized in layers capable of slipping over one another since they will be in a liquid state.

At last, the molecules will be arranged in an orderly manner because they will be in a solid state if the temperature is below -114.2 °C.

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A brass rod, a copper rod, an iron rod and a lead rod went into water with wax on top, an iron rod will rust first if lead stayed on the longest and copper for the least.

Rust is an iron oxide, which is a typically reddish-brown oxide created by the catalytic interaction of iron with oxygen in the absence of water or air moisture. Rust is often connected with the corrosion of refined iron and is composed of hydrous iron(III) oxides (Fe2O3nH2O) with iron(III) oxide-hydroxide (FeO(OH), Fe(OH)3).

Given enough time and the presence of oxygen and water, any iron mass may ultimately rust completely. A brass rod, a copper rod, an iron rod and a lead rod went into water with wax on top, an iron rod will rust first if lead stayed on the longest and copper for the least.

Therefore, an iron rod will rust first if lead stayed on the longest and copper for the least.

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If a 5.68-g sample of ZnS contains 3.80 g of Zn then the mass of Zn that can be obtained from 7.53 kg of Zns. is 5.04kg so correct option is

(b) 5.04kg.

With the provided data, we can first determine the mass percent content of zinc in ZnS:

(Mass of Zn / Mass of ZnS) times 100% Equals mass percent of Zn

3.80 g / 5.68 g x 100%, where mass percent of Zn

Zn mass percentage is 66.9%.

This indicates that zinc accounts for 66.9% of the mass of ZnS. This number can be used to determine how much Zn can be extracted from 7.53 kg of ZnS:

mass of Zn from 7.53 kg of ZnS is equal to (66.9 / 100) × 7.53 kg, or 5.04 kg.

As a result, 5.04 kg of Zn can be extracted from 7.53 kg of ZnS. 5.04 kg is the correct answer (b).

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The conversion factors are, a. 1 kilometer = 1000 meters, 1 meter = 0.001 kilometers b. 1 liter = 1,000,000 microliters, 1 microliter = 0.000001 liters c. 1 second = 1000 milliseconds, 1 millisecond = 0.001 seconds

Here are the conversion factors for each pair of units:

a. Meters and kilometers:

1 kilometer = 1000 meters

1 meter = 0.001 kilometers

b. Liters and microliters:

1 liter = 1,000,000 microliters

1 microliter = 0.000001 liters

c. Seconds and milliseconds:

1 second = 1000 milliseconds

1 millisecond = 0.001 seconds

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The distance between the two hydrogen atoms in a molecule of water is 0.00000000172 m, 1.72x10⁻⁹ m is the distance in scientific notation.

Scientific notation is defined as a way of writing very large or very small numbers. A number is written in a very scientific notation when a number between 1 and 10 is multiplied by a power of 10. Let's consider for example, 650,000,000 can be written in scientific notation as 6.5 × 10⁸.

Distance is basically defined as the distance, or separation, between two objects. An example distance is 5 feet between two tables. Distance is a scalar quantity.

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Increased gas solubility Reduced gas solubility As a body of water's temperature rises, Oz's gas solubility remains unchanged. Air enters the blood when the diver drops 10 meters; an atm of pressure rises.

Gas molecules can more easily leave the solution phase at higher temperatures due to their higher kinetic energy. As a result, solubility declines. A measurement of the concentration of dissolved gas particles in a liquid, solubility is a function of gas pressure. A gas's solubility rises as pressure is increased, but it falls as pressure is decreased due to an increase in collision frequency. The solubility of gases rises with pressure, as one might anticipate. According to Henry's Law, a gas's solubility in a liquid is directly inversely proportionate to the gas's pressure above the surface of the solution. thus this will most effectively release the pressure that has been imposed.

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Answer:

1.50 Gm

Explanation:

The distance from the Earth to the Sun can be converted from kilometers to gigameters (Gm) by dividing by 10^9:

1.50 x 10^8 km / 10^9 = 1.50 Gm

So, the distance from the Earth to the Sun is 1.50 Gm.

ALLEN

Answer:

Explanation:

The new pressure can be calculated using the Ideal Gas Law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant (8.31 J/mol*K), and T is the temperature (assumed to be constant).

Since the number of moles of gas and temperature is constant, we can rearrange the equation to solve for the new pressure:

P = (NRT) / V

Using the initial conditions of P1 = 2.00 atm and V1 = 103.0 liters, we can find the new pressure P2 after the expansion to 156.0 liters:

P2 = (P1 * V1) / V2 = (2.00 atm * 103.0 liters) / 156.0 liters = 1.30 atm

Therefore, the new pressure is 1.30 atm, and the correct answer is (c) 1.32 atm.

The liters would we need to make the 1 M solution if we have 6 mol of sodium hydroxide of 6 L.

The moles of the sodium hydroxide = 6 mol

The molarity of the sodium hydroxide = 1 M

The expression for the molarity is as follows :

The molarity = moles / volume in L

The volume of the sodium hydroxide = moles / molarity

The volume of the sodium hydroxide = 6 / 1

The volume of the sodium hydroxide = 6 L.

Thus the volume of the sodium hydroxide is 6L in the 1 M of the solution.

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