Physical or Chemical Change? Burning leaves

The reaction, given that the reaction has equilibrium constant of

kₑq = [NOI]² / [NO]²[I₂] is:

2NO + I₂ ⇌ 2NOI (3rd option)

The equilibrium constant, Keq expression for a given reaction is written as illustrated below:

nReactant ⇌ mProduct

Equilibrium constant (Keq) = [Product]ᵐ / [Reactant]ⁿ

With the above information, we can simply obtain the reaction for the question given above as follow:

kₑq = [NOI]² / [NO]²[I₂]

But,

kₑq = [Product]ᵐ / [Reactant]ⁿ

Thus,

Reactants => NO and I₂

Product => NOI

Therefore, the reaction is: 2NO + I₂ ⇌ 2NOI (3rd option)

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Answer:

When the bulb is turned on, an electrical current passes through the filament, heating it up so much that it emits light.

Explanation:

The temperature of the reaction mixture drops once the reaction reaches the stoichiometric point due to the release of excess heat energy generated during the reaction.

During a chemical reaction, heat energy can be either released or absorbed. In an exothermic reaction, heat is released as a product, while in an endothermic reaction, heat is absorbed from the surroundings. When a reaction is not at its stoichiometric point, there is an excess of one or more reactants present. As the reaction progresses towards the stoichiometric point, the reactants are consumed, and the reactant concentration decreases.

At the stoichiometric point, the reactants are in the ideal ratio according to the balanced chemical equation. Any additional reactant beyond this point becomes excess and is no longer needed for the reaction. The excess reactant molecules do not participate in the reaction but continue to collide with each other, leading to intermolecular interactions and the release of excess heat energy. This excess heat energy dissipates into the surroundings, causing a drop in the temperature of the reaction mixture.

The decrease in temperature at the stoichiometric point is a result of the endothermic nature of the excess heat release, counteracting the exothermic nature of the reaction up to that point. This phenomenon is commonly observed in various chemical reactions and provides important insights into the energy changes occurring during the reaction process.

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Answer:

A. The largest value is 7 and the smallest value is 1. Find the difference. 7 - 1 = 6.

Explanation:

Answer:

Steam produces more severe burns.

Explanation:

This is because, even though both boiling water and steam are of the same temperature [ 1000c] , the steam contains the extra latent heat of vapourisation

Answer:

4.9 × 10²³ molecules

Explanation:

Given data:

Number of molecules = ?

Number of moles of oxygen = 0.815 mol

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

0.815 mol  ×  6.022 × 10²³ molecules  / 1 mol

4.9 × 10²³ molecules

The correct option from the given statements concerning mixtures is (d) more than one correct response.

The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.

The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).

The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.

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Answer:

they require more testing in real-word conditions

Explanation:

One of the biggest reasons for this very slow uptake of hydrogen vehicles is the existing infrastructure. ... The sceptics' first argument against hydrogen vehicles is that they're less efficient than EVs are. Because hydrogen doesn't occur naturally, it has to be extracted, then compressed in fuel tanks.

Answer:

Decane Is the IUPAC name of C10H22

By the IUPAC Naming Convention followed by every chemical standards, the structure shown in the image is named as Decane.

IUPAC Stands for International Union of Pure and Applied Chemistry.This organisation issued some standards for naming any chemical components that is followed world wide.

According to the IUPAC Standards:

First of all we have to identify the longest carbon chain which is [CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH3] alkane group according to this image.As a result of 10 carbon linked with single bonds and having hydrogen to balance the electron share it will be named  Decane.It is an alkane hydrocarbon with the chemical formula C10H22.

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Answer:

When you are going to measure small lengths or objects or when you are going to measure things with great accuracy.

Explanation:

Answer:

A pure substance consists only of one element or one compound and a mixture consists of two or more different substances, not chemically joined together.

So, a mixture is like mixing - let's say - sugar and rice together (dry BTW), but you can clearly see both substance are not chemically mixed together, if that makes sense. Thus, you can easily separate them out.

The balanced chemical equation for the reaction between hydrazine and oxygen shows that one mole of N2H4 reacts with one mole of O2 to produce one mole of N2 and two moles of H2O.

\(N2H4(l) + O2(g) → N2(g) + 2H2O(g)\).

Therefore, if 6 moles of hydrazine react with an excess of oxygen, we can determine the amount of water produced as follows: 6 moles

\(N2H4 x (2 moles H2O / 1 mole N2H4) = 12 moles H2O\).

Therefore, the answer is 12 moles of water will be produced when 6 moles of hydrazine reacts with an excess of oxygen.

\(N2H4(l) + O2(g) → N2(g) + 2H2O(g)\)

From the equation, we see that for every 1 mole of hydrazine that reacts, 2 moles of water are produced. Therefore, if 6 moles of hydrazine react, we can expect the production of:  \(2 x 6 = 12\) moles of water  Therefore, the answer is option (d) 12.0 mol H2O.

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A mass of gas has a pressure of 450 kPa and temperature of 140°C. The pressure is doubled during a process but the volume remains unchanged.

In order to solve this problem, we need to apply Charles' Law: V1/T1 = V2/T2. Since the volume remains unchanged, we can simplify this to T1/P1 = T2/P2. T1 and P1 are the initial temperature and pressure, respectively. T2 is the unknown final temperature, and P2 is double the initial pressure (i.e., 2P1).

Substituting the given values:140 + 273 = 413 K450 kPa * (2) = 900 kPa413 K/450 kPa = T2/900 kPaT2 = (413 K / 450 kPa) * (900 kPa) = 756 KWe must then subtract 273 to convert from kelvin to Celsius. Therefore, T2 = 483°C, which is the new temperature.

In this case, the gas law to apply is Charles’ law which states that at a constant pressure, the volume of a fixed amount of gas is directly proportional to its absolute temperature. The general equation of Charles' law is V1/T1 = V2/T2, where V is the volume of the gas, T is the temperature, and the subscripts 1 and 2 denote initial and final states, respectively. For our question, since the volume remains unchanged, we can simplify this to T1/P1 = T2/P2. T1 and P1 are the initial temperature and pressure, respectively. T2 is the unknown final temperature, and P2 is double the initial pressure (i.e., 2P1).

Therefore, T2 = (T1 x P2)/P1. We can substitute the given values into the formula and solve for T2 as follows.

140 + 273 = 413 K450 kPa x 2 = 900 kPa

T2 = (413 K x 900 kPa)/450 kPa = 826 K

Subtracting the value of absolute zero (273) from 826, we obtain T2 = 553°C. This is the final temperature of the gas after doubling the pressure.

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Answer: i believe it is a quarter six  

The  two other parts of a vehicle that help keep passenger safe are;

Airbags is very useful in a lace where a collision occurs , a car's airbags will inflate to protect the driver and passengers from frequent contact locations, such as the steering wheel, dashboard, and sides of the car.

Seatbelts, often known as safety belts, are a type of restraint device that keeps occupants securely in place during an accident or sudden stop, lessening the force of the vehicle's interior on the body and avoiding ejection. Since they were initially developed, seatbelts have undergone tremendous development.

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Answer:

Option 2: temperature and volume

Explanation:

took the test

Temperature and volume are the variables for this piston.

Temperature is a measure of hotness or coldness

The volume of a gas is directly proportional to its absolute temperature. More specifically, for a fixed mass of gas at constant pressure, the volume (V) is directly proportional to the absolute temperature (T).

This is Charles' Law. V = kT, where k is a proportionality constant.

Hence, temperature and volume are the variables for this piston.

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The ways to  make a skit are:

In skit making, one can start by coming up with humorous concepts for your skit. Write out your scenario, practice it, and then perform it in front of an audience or record it. Then Continue to create fresh drafts.

Note that one can ask someone you trust's opinion should see your sketch. Then make a note of what people found amusing and not amusing.

Therefore, skit  is seen as short comedy show that can be performed by second graders.

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The molecular weight of cerium(IV) nitrate hexahydrate is 446.24 g/mol. Therefore, one mole of cerium(IV) nitrate hexahydrate contains one mole of cerium(IV) ions, which will combine with four moles of nitrate ions to form one mole of cerium(IV) nitrate hexahydrate.

The formula for the concentration of ions in a solution is C = n/V where C is the concentration of ions, n is the number of moles of ions, and V is the volume of the solution in liters. The first step in solving this problem is to calculate the number of moles of cerium(IV) nitrate hexahydrate in 150.0 mL of a 0.565 M solution. This can be done using the following formula:n = M x V n = 0.565 mol/L x 0.150 L= 0.08475 mol of cerium(IV) nitrate hexahydrate This amount contains four times as many moles of nitrate ions as cerium(IV) ions.

Therefore, the number of moles of nitrate ions is: nitrate ions = 4 x 0.08475 militate ions = 0.339 molThe volume of the solution is 150.0 mL, which is equal to 0.150 L. Using the formula given above, we can calculate the concentration of nitrate ions :C = n/V= 0.339 mol/0.150 LC = 2.26 M Therefore, the concentration of nitrate ions in the solution is 2.26 M.

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Answer: Ionic compounds/bonds don’t lose electrons. They transfer electrons

Explanation: Sodium is going to get the +7 charge and Iodine will not need to have a charge beside it. Your formula should look like this Na7I

Crystallization of sugar in a syrup can be avoided by adding inverted sugar. Invert sugar is a mixture of glucose and fructose, produced from sucrose. It is produced by hydrolysis of sucrose by heating with water and an acid such as lemon juice, vinegar or cream of tartar.

By adding invert sugar to a syrup, it reduces the amount of sucrose present in the solution and promotes the formation of glucose and fructose. This causes the solution to become more saturated and the syrup less likely to crystallize. Invert sugar is often used in the production of confectionery, ice cream, and other sweets.Inverted sugar can also be used to improve the texture and quality of baked goods. It is often used in cake recipes to enhance the flavor and increase the shelf life. It can also be used as a substitute for honey or corn syrup in recipes that require a liquid sweetener.In conclusion, the addition of invert sugar helps to prevent crystallization of sugar in syrup. Invert sugar is a mixture of glucose and fructose produced from sucrose by hydrolysis.

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Answer:

A chemical change happens when one chemical substance is transformed into one or more different substances, such as when iron becomes rust. Chemical changes occur through the process of chemical reactions, and the resulting substances have different properties because their atoms and molecules are arranged differently.

Explanation:

Chemical change refers to a fundamental transformation in which atoms and molecules rearrange their bonds and configurations, resulting in the formation of new substances with distinct properties.

During a chemical change, the original molecules may break apart, combine, or rearrange their constituent atoms to create different molecules, often accompanied by the absorption or release of energy. This process involves the conversion of reactant molecules into product molecules through various chemical reactions, reflecting alterations at the atomic level.

Unlike physical changes, which involve modifications in state or appearance without altering the chemical composition, chemical changes lead to the creation of novel substances, showcasing the dynamic and intricate nature of molecular interactions and the fundamental behaviors of matter.

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Answer: \(H_2O_2\rightarrow H_2+O_2\)

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical equation for showing hydrogen peroxide decomposing into hydrogen and oxygen is:

\(H_2O_2\rightarrow H_2+O_2\)

Answer:

Increasing the H+/H3O+ will decrease the pH, while increasing the OH- ions will increase the pH

Explanation:

so pH=-log(H), which means that the smaller H gets to 0, the more the pH rises. The larger the H+ gets, the smaller the pH
if H is 1, then pH is 0
if H is 0.1, then pH is 1
if H is 0.01, then pH is 2
and so on
if H is 0.00000000000001, then the pH is 14
When OH goes up, H goes down, so
if OH is 0.00000000000001, then the ph is 0
if OH is 0.0000000000001, then the pH is 1
and so on
If the OH is 1, then the pH is 14

The change in entropy ΔS when 63 g of acetonitrile boils at 81.6°C is 0.129 kJ/K. We have used the correct number of significant digits and included the unit symbol for the answer.

The heat of vaporization \(\(\Delta \)H_v\) is the amount of heat required to vaporize a substance at its boiling point. In this case, the heat of vaporization of acetonitrile \(CH_3CN\) is given as 29.8 kJ/mol. To calculate the change in entropy ΔS when 63 g of acetonitrile boils at 81.6°C, we need to use the formula \(\(\Delta \)S = {{(\(\Delta \)H_v)}/{T_b}}\), where \(T_b\) is the boiling point in Kelvin.
First, we need to convert the given temperature to Kelvin by adding 273.15. So, \(T_b = (81.6 + 273.15) K = 354.75 K\).
Next, we need to calculate the number of moles of acetonitrile in 63 g. The molar mass of acetonitrile is 41.05 g/mol. Therefore, the number of moles is given by n = \(n=\frac{63g}{41.05g/mol} = 1.5338 mol\).
Now we can substitute the values in the formula to get \($\Delta$S = {$\Delta$H_v}/{T_b}  = \frac{29.8 kJ/mol}{354.75 K} = 0.084 kJ/(mol*K)\).
Finally, we need to multiply this value by the number of moles to get the change in entropy for 63 g of acetonitrile. So, \(\(\Delta \)S = 0.084 kJ/(mol*K) * 1.5338 mol = 0.129 kJ/K\).

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If the sample is below the solvent, the spot will be washed off the plate and will be mixed in with the solvent

Using the relative amounts of each solute distributed between a fluid stream in motion, known as the mobile phase, and a stationary phase that is adjacent to it, chromatography is a technique for separating the components, or solutes, of a mixture. In contrast to the stationary phase, which can be either a solid or a liquid, the mobile phase can be either a liquid or a gas.

As differential migration from a small starting zone, chromatography is one of many separation procedures.

Another member of this category is electrophoresis. In this situation, the driving force is an electric field, which affects different solutes differently depending on their ionic charge. The nonflowing solvent's viscosity acts as a resistive force. These forces work together to produce ion mobilities specific to each solute.Chromatography can be used to read the contents of a mixture by feeding its output into a detector

If the solvent level in the developing jar is deeper than the origin (spotting line) of the TLC plate, the solvent will dissolve the compounds into the solvent reservoir instead of allowing them to move up the plate by capillary action. Thus, you will not see spots after the plate is developed.If it is below the solvent, the spot will be washed off the plate and will be mixed in with the solvent.

Thus the sample spot will be washed off and will be mixed in with the solvent.

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Deprotonation of phenol by NaOHPhenol is a weak acid with a pKa value of 10, so it is not very acidic but it can be deprotonated with a strong base like sodium hydroxide (NaOH). The mechanism for this reaction is a simple acid-base reaction where NaOH acts as a base and removes the proton (H+) from phenol.

The curved arrow mechanism is shown below:Here, the Na+ ion comes in and removes the H+ ion from the O-H bond in phenol and forms water as a by-product. The major organic product is phenoxide ion (C6H5O−) which is formed after the deprotonation reaction.SN2 reaction of phenoxide with chloroethane Phenoxide ion is a good nucleophile because it has a negative charge on the oxygen atom which is able to attack the positively charged carbon atom in chloroethane. The mechanism for this reaction is a nucleophilic substitution (SN2) reaction where the phenoxide ion acts as a nucleophile and replaces the chloride ion in chloroethane. The curved arrow mechanism is shown below:Here, the phenoxide ion attacks the carbon atom in chloroethane, and the chloride ion leaves as a leaving group. The major organic product is ethyl phenyl ether (C6H5OC2H5) which is formed after the SN2 reaction.

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Answer:

8306.76

Explanation:

you just calcuate 8.12 x 1023 and that will give you the answer