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a) Enthalpy change in specify chemical reaction is 126 kJ/mol.

b) The specify chemical reaction is endothermic reaction.

c) This is not a spontaneous reaction.

We have, a reaction as present below,

\( CH_3CH_3 + I^{.} -> CH_3CH_2^{.} + HI \\ \)

In this reaction, the reactant

\(CH_3CH_2-H\) bond is broken and H-I bond formed. So,

a) The standard enthalpy of reaction for a chemical reaction is defined as the difference between molar enthalpies of total reactant and total product and it is calculated for substances when they present in standard states.

Change in enthalpy = -297 + 423

= 126 kJ/mol.

b) It is endothermic reaction as change in en thakly is positive.

c) No,the reaction will not be spontaneous in the direction written.as, the enthalpy change is positive.

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Answer:

46.839728  grams of water

Explanation:

1 mole is equal to 1 moles H2O, or 18.01528 grams

18.01528 times 2.6 = 46.839728

There are 46.839728  grams h20 in 2.60 mol of the compound

Answer:

D. an orbital notation of the atom

Explanation:

Orbital notiation uses lines and arrows to show shells, subshells, and orbitals for electrons in an atom. Since it shows arrows being paired up in this diagram it would be the best model for Chuck to use.

On Edgenuity2020, the answer is D) an orbital notation of the atom

To determine the molar concentration of the hydrochloric acid (HCl) solution, we need to use the information provided about the mass of anhydrous sodium carbonate and the volume of HCl solution used in the titration.

Given:

Mass of anhydrous sodium carbonate: 0.338 g

Volume of HCl solution used: 15.3 mL

First, we need to convert the volume of the HCl solution to liters:

Volume of HCl solution = 15.3 mL = 0.0153 L

Next, we need to determine the number of moles of anhydrous sodium carbonate (Na2CO3) using its molar mass. The molar mass of Na2CO3 is 105.99 g/mol.

Number of moles of Na2CO3 = Mass / Molar mass

Number of moles of Na2CO3 = 0.338 g / 105.99 g/mol

Now, since the balanced chemical equation between Na2CO3 and HCl is 1:2, we can determine the number of moles of HCl required for the reaction.

Number of moles of HCl = (Number of moles of Na2CO3) * 2

Next, we calculate the molar concentration of the HCl solution using the moles of HCl and the volume of the HCl solution.

Molar concentration of HCl = (Number of moles of HCl) / Volume of HCl solution

Substituting the values:

Molar concentration of HCl = (0.338 g / 105.99 g/mol) * 2 / 0.0153 L

Calculating the value:

Molar concentration of HCl ≈ 0.442 mol/L

Therefore, the molar concentration of the hydrochloric acid (HCl) solution is approximately 0.442 mol/L.

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Answer:

Yes.

Explanation:

Yes, this difference of readings will definitely affect the results of the experiment as well as the E values because the readings taken by both students are different from one another. There is a fault in one of the thermometer because both shows different readings of temperature of the same solution. This will affect the overall experiment and due to this error, we are unable to tell that which one reading is correct so the answer is uncertain or unsure.

Given that the disturbance travels along the length of the rope, the farther I move my arm, the larger the size of the wave in the rope.

A wave is a disturbance along a medium which transfers energy. We know that a wave could be classified based on the nature of the propagation of  the wave as the transverse or the longitudinal waves.

The wave that is created along a string is a longitudinal wave. The direction of the wave motion is the same as that of the disturbance. It is very easy to create a wave on a string when the sting is moved vigorously and the wave is found to travel quickly across the length of the rope is we can see from the image that I have attached to make the concept and the context of the answer a bit more clearer to the student in this case.

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Sodium (Na) and Potassium (K) are most likely from the same family or group in the periodic table because they both react with chlorine (Cl) to form compounds that are similar in their chemical properties.

Moles are a unit of measurement used in chemistry to express the amount of a substance. One mole of a substance is defined as the amount of that substance that contains as many elementary entities (such as atoms, molecules, or ions) as there are in 12 grams of carbon-12. Moles are used to simplify calculations involving chemical reactions and to relate the amount of one substance to the amount of another substance in a reaction. For example, the stoichiometry of a chemical reaction is expressed in terms of moles, where the coefficients in the balanced equation represent the number of moles of each substance that are involved in the reaction. Moles can be calculated from the mass of a substance using its molar mass, which is the mass of one mole of that substance.

Here,

Specifically, both Na and K react with Cl to form ionic compounds with a 1:1 stoichiometry, NaCl and KCl, respectively. This is because Na and K are both Group 1 (also called the alkali metals) in the periodic table, and they have similar electronic configurations, with a single valence electron in their outermost shell. This outer electron is easily removed, making them highly reactive with nonmetals like Cl. Aluminum (Al), Magnesium (Mg), and Calcium (Ca) are from different groups in the periodic table and do not form similar compounds with chlorine.

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Answer:

A. any nucleus.

Explanation:

Let's remember the concepts of strong nuclear force and electrostatic force:

- Strong nuclear force: is the force that keeps the nuclei together (protons and neutrons together).

- Electrostatic force: is the attractive and repulsive forces between particles due to electric charges (positive and negative charges).

We have to take into account that the strong nuclear force is the strongest fundamental force in nature, so this means that the strong nuclear force is greater than the electrostatic force.

Thus, based on this logic, the answer would be that any nucleus has a strong nuclear force that is greater than the electrostatic force, so the answer is A. any nucleus.

Answer:

Ca2+ is cation

Explanation:

Because cation contain positive charge.

Answer:

5 N.

Explanation:

We can calculate the net force on the object by using Newton's second law of motion:

F is the net force on an object

m is the mass of the object

a is its acceleration

For the object in this problem, we have

m = 1 kg is its mass

is its acceleration

Substituting into the equation, we find the net force:

The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.


The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.

The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.

The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.

So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons

In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion

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Sodium losses electrons to become Na+, thus forms a cation.

Fluoride gains electrons to become F-, thus forms an anion.

Iron losses electrons to become Fe2+, thus forms a cation.

Silver also losses electrons to be Ag+, thus forms a cation.

The temperature of the reaction affects the free energy of the reaction by impacting the entropy change, which is determined by the difference in the number of moles of products and reactants.

In an exothermic reaction, heat is released, making the enthalpy change (ΔH) negative. The free energy change (ΔG) for a reaction can be calculated using the following formula:

ΔG = ΔH - TΔS

Where ΔG is the free energy change, ΔH is the enthalpy change, T is the temperature in Kelvin, and ΔS is the entropy change. Since the reaction yields seven moles of gas products from six moles of gas reactants, there is an increase in the number of moles, which results in a positive entropy change (ΔS).

As the temperature of the reaction increases, the TΔS term becomes larger, and the free energy change (ΔG) becomes less negative. In other words, a higher temperature favors the reaction, making it more spontaneous due to the increase in entropy (moles of gas products).

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Answer:

The piece of wood will sink

Explanation:

If an object has a density higher than water, it will sink, and the piece of wood is more dense than water when measured.

Answer:

"0.583" is the appropriate answer.

Explanation:

Let,

The initial constant of \(N_2O_4\) be "C".

Amount of \(N_2O_4\) dissociated into \(NO_2\) be "x".

now,

                                     \(N_2O_4 \rightleftharpoons 2NO_2\)

Initial constant               C            -

Equilibrium constant     C          2x

The Kc is given as:

⇒ \(K_c = \frac{[NO_2]^2}{[N_2O_4]}\)

         \(=\frac{(2x)^2}{C-x}\)

\(0.593=\frac{4x^2}{0.88-x}\)

  \(4x^2=0.593(0.88-x)\)

  \(4x^2=0.512-0.593\ x\)

     \(x=0.291\)

hence,

The constant of \(NO_2\) will be:

= \(2x\)

= \(0.583\)

The following formula can be used to determine how many moles of KC1 are present in 1250 mL of 0.75 M KC1: Molarity (M) is equal to the moles of solute per litre of solution.

In this instance, the volume of the solution is 1250 mL, and the molarity of KC1 is 0.75 M. The following formula can be used to determine how many moles of KC1 are present in 1250 mL of 0.75 M KC1: Molarity (M) times the number of litres in the solution equals 0.75 M times (1250 mL/1000 mL/L) or 0.9375 moles of KC1.

Consequently, 0.9375 moles of KC1 are present in 1250 mL of 0.75 M KC1. It is significant to remember that a solution's molarity is a measurement of the amount of a solute present in a given volume of the solution.

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\ (•◡•) / Hey There!

Answer ➜ Mass is the amount of matter in a material, while Weight is a measure of how the force of gravity acts upon that mass.

✧☺ Hope this Helps! ✧☺

Answer:

Mass is defined as the amount of inertia (resistance to change in motion) that something has. Weight is how heavy it is. Example: in space, weight does not change, mass does.

Explanation:

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22.7 liters approx volume of hydrogen gas is produced when 96.7 g of sodium reacts completely according to the following reaction at 25 degree C and 1 atm.

The chemical equation for the reaction is:

2Na(s) + 2H2O(l) -> 2NaOH(aq) + H2(g)

To calculate the volume of hydrogen gas produced, we first need to determine the number of moles of hydrogen produced. We can do this by using the molar mass of hydrogen and the mass of sodium that reacts. First, we convert the mass of sodium from grams to moles:

49.7 g Na / 22.99 g/mol = 2.17 mol Na

Since the chemical equation tells us that 2 mol of Na produce 1 mol of H2, we can use the mole ratio to calculate the number of moles of hydrogen produced:

2.17 mol Na * (1 mol H2 / 2 mol Na) = 1.09 mol H2

Next, we use the ideal gas law to calculate the volume of hydrogen gas produced at a temperature of 25 °C and a pressure of 1 atm:

V = (n * R * T) / P

where V is the volume of the gas, n is the number of moles, R is the gas constant, T is the temperature in Kelvin, and P is the pressure.

Putting values, we get:

V = (1.09 mol * 8.31 J/mol*K * 298 K) / 1 atm

= 22.7 L

So, the volume of hydrogen gas produced is approximately 22.7 liters.

It's important to note that this calculation assumes that the reaction goes to completion and that the hydrogen gas behaves as an ideal gas. In real-world situations, these assumptions may not always hold, so the actual volume of hydrogen gas produced may be different.

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Question - What volume of hydrogen gas is produced when 49.7 g of sodium reacts completely according to the following reaction at 25 °C and 1 atm?

2Na(s) + 2H2O(l) -> 2NaOH(aq) + H2(g)

When you use a soap or detergent to wash, the surfactant molecules will interact with the dirt and oils to help wash them away. During this interaction, something called a micelle is formed.

A micelle is a cluster of surfactant molecules that are formed when soap or detergent molecules are mixed with water. When soap or detergent is added to water, the hydrophobic tails of the molecules (which do not mix with water) cluster together, while the hydrophilic heads (which are attracted to water) point outwards towards the water.

Micelles are formed by the hydrophobic tails of the surfactant molecules clustering together in the center, with the hydrophilic heads facing outward.

The soap or detergent's molecules' hydrophobic tails attract oils and dirt, while the hydrophilic heads attract water molecules. The hydrophobic tails of the detergent molecules encircle the dirt and oil particles, while the hydrophilic heads point outward toward the water, creating a micelle.

The micelles disperse the dirt and oil particles throughout the water so that they can be washed away.

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Volume under the following condition is 280.47 cm³.

Given,

intial volume is 310cm³

temperature is 242K

final pressure is 840mmHg

pressure at STP is 1atm or 760mmHg

we have to find out volume at final pressure

Use Boyle's law

P1 * V1 = P2 * V2

Put the values from the question

760* 310 = 840 * V2

V2 = 760* 310 / 840

V2 = 280.47 cm³

Therefore, volume at final pressure is 280.47 cm³.

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Answer: 5.2g of ammonium perchlorate will produce approximately 1.59 g of water.

Explanation:

The balanced chemical equation for the reaction of ammonium perchlorate with itself is:

NH4ClO4(s) -> N2(g) + Cl2(g) + 2O2(g) + 2H2O(l)

From the equation, we can see that 1 mole of ammonium perchlorate produces 2 moles of water.

To obtain the amount of water produced by 5.2g of ammonium perchlorate, we first need to determine how many moles of ammonium perchlorate we have:

molar mass of NH4ClO4 = NH4: 14.01 g/mol + Cl: 35.45 g/mol + 4O: 4x16.00 g/mol = 117.49 g/mol

moles of NH4ClO4 = mass / molar mass = 5.2 g / 117.49 g/mol = 0.0442 mol

Now we can use the mole ratio between ammonium perchlorate and water to find the amount of water produced:

moles of H2O = moles of NH4ClO4 x 2

moles of H2O = 0.0442 mol x 2 = 0.0884 mol

Finally, we can convert the moles of water to mass using the molar mass of water:

molar mass of H2O = 2(1.01 g/mol) + 16.00 g/mol = 18.02 g/mol

mass of H2O = moles of H2O x molar mass of H2O

mass of H2O = 0.0884 mol x 18.02 g/mol = 1.59 g

Therefore, 5.2g of ammonium perchlorate will produce approximately 1.59 g of water.

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The process by which most alcohol is eliminated from the body is called oxidation. In this process, alcohol is metabolized by the liver enzymes into acetaldehyde and then further oxidized into acetic acid. The remaining alcohol is eliminated through other means such as excretion through breath, urine, and sweat. This elimination process is useful in testing for alcohol as it allows the measurement of alcohol levels in breath, urine, and blood samples to determine a person's level of intoxication.

The primary process by which alcohol is eliminated from the body is oxidation. When alcohol is consumed, it is primarily metabolized in the liver by enzymes called alcohol dehydrogenases (ADH). ADH converts alcohol into acetaldehyde, a toxic substance. Acetaldehyde is further metabolized by another enzyme called aldehyde dehydrogenase (ALDH) into acetic acid, which can be further utilized by the body for energy production.

In addition to oxidation, a small amount of alcohol can be eliminated through breath, urine, and sweat. Alcohol molecules in the bloodstream can diffuse into the alveoli in the lungs and be exhaled in the breath, allowing the measurement of alcohol levels through breathalyzer tests. Alcohol can also be excreted in urine and small amounts can be eliminated through sweat.

This elimination process is useful in testing for alcohol as it allows the assessment of alcohol concentration in various bodily fluids. Breathalyzer tests measure the alcohol content in exhaled breath, providing a quick and non-invasive method for estimating blood alcohol concentration. Urine and blood tests can also be used to determine alcohol levels, enabling accurate assessment of intoxication levels for legal and medical purposes.

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In order to determine the pH in the given scenarios, several calculations and considerations need to be taken into account.Firstly, the Henderson-Hasselbalch equation can be used, which relates the pH of a solution to the pKa of the acid and the ratio of its conjugate base to the acid. This equation is pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the acid.

The first problem asks for the pH of a solution made by mixing 0.20 mol of acid HA with 0.30 mol of its conjugate base NaA. The pH can be calculated using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]). Given that the pKa is 6, we can plug in the values and solve for the pH.

The second problem asks for the pH after adding 0.05 mol of NaOH to the previous solution. Since NaOH is a strong base, it will react with the acid HA and form water.

The amount of NaOH added is small compared to the amount of acid, so we can assume that the acid will be fully neutralized. We can calculate the resulting concentration of the acid and its conjugate base and use the Henderson-Hasselbalch equation to find the new pH.

The third problem involves mixing 200 mL of 0.20 M HA with 300 mL of 0.30 M NaA. We need to calculate the concentrations of the acid and its conjugate base after mixing, and then use the Henderson-Hasselbalch equation to find the pH.

The fourth problem asks for the pH after adding 10 mL of 0.50 M HCl to the previous solution. Since HCl is a strong acid, it will completely dissociate and increase the concentration of the acid HA.

We need to calculate the new concentrations of the acid and its conjugate base and use the Henderson-Hasselbalch equation to find the new pH.

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A soluble impurity usually has two effects on the melting point of a compound: an increase in melting point range and a decrease in melting point.

In chemistry, there are two types of impurities: soluble and insoluble.

Soluble impurities are those that dissolve in water quickly and also have a significant impact on the chemical properties of a compound such as a significant increase or decrease in the melting point and boiling point.

For example, salt, milk, and sugar compounds are soluble impurities.

Similarly, insoluble impurities remain undissolved when mixed in water and are also known as suspended impurities.

Examples of insoluble impurities are sand, oil, chalk, rocks, pebbles, etc.

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Explanation:

pH+pOH=14

pH=14-pOH

=14-5.039e-3

=13.9