of the following, the entropy of gaseous is the largest at 25ec and 1 atm. a) c2h2 b) h2 c) c2h6 d) ch4 e) c2h2

The reaction between Sulfuric Acid and Sodium Hydroxide forms Water and Sodium Sulphate. Therefore option (1) is the correct answer.

Neutralisation is a chemical reaction where an acid and a base react with each other quantitatively. It is also written as Neutralisation. The acid strength of the reactant gives the pH of the neutralised solution.

Ever experienced a burning sensation in your stomach after eating too much spicy food? This is due to the formation of acid in the stomach. This problem can be cured by the consumption of an antacid which neutralizes the effect of acid, and this reaction is called a neutralisation reaction.

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Answer:

Explanatidescribe everyday events such as shaving, ear peircing, and brushing teeth so that they do not sound like "primitive" customs.

on:

Four different elements can form bonds with a carbon atom. So, HCCH equals CH. The triple bond is always the shortest bond length, followed by the double bond, and the single bond is the longest. HCCH (ethyne) compound has the shortest carbon-carbon bond length.

As bond order increases, bond length decreases. The distance separating the two nuclei that are joined together is known as the bond length. It varies according to hybridization, the quantity and kind of bonds, and the size of the atoms.

Since the length of a bond is inversely proportional to its strength, triple bonds, which are the strongest bonds, also have the shortest bond lengths. A triple bond length is shortened by the extra electrons' stronger attractive attractions on the nuclei. Bond lengths are listed in decreasing order: single bond ≥ double bond ≥ triple bond.

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The correct option is (A) - This Bohr Model of atom describes that there are a total of 6 electrons in the given figure.

The electrons are positioned in circular orbitals at particular distances from the central nucleus in the Bohr model of the atom. These orbits create electron shells or energy levels, which allow us to see how many electrons are present in each shell. The number and the letter "n" are used to identify these energy levels. The first energy level nearest to the nucleus, for instance, is represented by the 1n shell. Normally, an electron resides in the shell with the lowest energy, which is the one closest to the nucleus. A photon of light's energy can raise it to a higher energy shell, but this is an unstable position, and the electron quickly returns to the ground state.

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Boyle's Law-

[tex]\:\:\:\:\:\:\:\:\:\:\:\star\:\sf \underline{ P_1 \: V_1=P_2 \: V_2}\\[/tex]

(Pressure is inversely proportional to the volume)

Where-

As per question, we are given that -

Now that we have all the required values and we are asked to find out the final volume, so we can put the values and solve for the final volume -

[tex]\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\star\:\sf \underline{ P_1 \: V_1=P_2 \: V_2}[/tex]

[tex]\:\:\:\: \:\:\:\:\:\:\longrightarrow \sf 30 \times 14.3= 54\times V_2\\[/tex]

[tex] \:\:\:\:\:\:\:\:\:\:\longrightarrow \sf V_2 = \dfrac{30 \times 14.3 }{54}\\[/tex]

[tex] \:\:\:\:\:\:\:\:\:\:\longrightarrow \sf V_2 = \cancel{\dfrac{ 429}{54}}\\[/tex]

[tex]\:\:\:\: \:\:\:\:\:\:\longrightarrow \sf V_2 =7.944..........\\[/tex]

[tex] \:\:\:\:\:\:\:\:\:\:\longrightarrow \sf \underline{V_2 = 7.94 \:L }\\[/tex]

Therefore, the volume will become 7.94 L when the pressure is increased to 54 atm.

13473 calories of heat were added to 449.1 g of water to raise its temperature from 25 degrees C to 55 degrees C.

To calculate the heat added to water, we can use the following formula:

Q = m * c * ΔT

Q = heat added (in calories)

m = mass of water (in grams)

c = specific heat of water (1 calorie/gram degree Celsius)

ΔT = change in temperature (in degrees Celsius)

Using the given values:

m = 449.1 g

ΔT = (55 - 25) = 30 degrees C

Substituting these values into the formula, we get:

Q = 449.1 g * 1 cal/g °C * 30°C

Q = 13473 calories

Calories are a unit of measurement for energy. They are used to quantify the amount of energy in food and the amount of energy that our bodies burn through physical activity. One calorie is defined as the amount of energy required to raise the temperature of one gram of water by one degree Celsius

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To determine the actual pH of a solution with an unknown pH, a good choice of indicator would be a universal indicator.

A universal indicator is a mixture of several different pH-sensitive dyes that change color over a wide pH range, typically from 1 to 14.

This allows for more precise pH determination than single indicators, which are usually limited to a smaller pH range. Here are the steps to use a universal indicator:

1. Obtain a small sample of the unknown solution.

2. Add a few drops of the universal indicator to the solution.

3. Observe the color change in the solution.

4. Compare the color with the provided pH color chart that comes with the universal indicator.

5. Determine the pH value of the solution based on the color observed. Using a universal indicator will allow you to accurately determine the actual pH of the unknown solution.

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Answer:

If you dey Naija I get one thing for you

Explanation:

Just Dey Play na the thing wey I wan give you

(I) 5.30 × [tex]10^{-9}[/tex]The Ksp value for iron (II) oxalate is 5.30 × [tex]10^{-9}[/tex]

This is because iron (II) oxalate dissociates in water to form Fe2+ and oxalate ions, and then the solubility product constant (Ksp) can be calculated using the concentration of Fe2+ ions in a saturated solution of iron (II) oxalate. The solubility product constant (Ksp) expression for iron (II) oxalate is given by the equation below;FeC2O4 (s) → Fe2+ (aq) + C2O42- (aq)Ksp = [Fe2+][C2O42-]To calculate Ksp, the concentration of the dissociated ions (Fe2+ and C2O42-) in a saturated solution of FeC2O4 must be known. We know that the concentration of Fe2+ ions in a saturated solution of iron (II) oxalate is 5.47 x [tex]10^{-4}[/tex]  M. Thus, substituting this value into the Ksp expression, we have;Ksp = [Fe2+][C2O42-] = (5.47 × [tex]10^{-4}[/tex] )(2 × 5.47 × [tex]10^{-4}[/tex] )Ksp = 5.30 × [tex]10^{-9}[/tex] .Therefore, the Ksp value for iron (II) oxalate is 5.30 × [tex]10^{-9}[/tex].

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The balanced chemical equation for the reaction between carbon (C) and oxygen (O2) to form carbon monoxide (CO) and carbon dioxide (CO2) is below and the moles of CO2 produced is 0.117.

C + O2 → CO + CO2

According to the equation, for every 1 mole of C, we need 1 mole of O2 to produce 1 mole of CO and 1 mole of CO2.

Given that we have 0.155 moles of C and 0.117 moles of O2, we can use the mole ratio from the balanced equation to determine how many moles of CO2 could be produced:

Moles of CO2 = Moles of C = 0.155 moles

Therefore, based on the moles of each reagent, we could produce a maximum of 0.155 moles of CO2.

To determine the limiting reagent, we need to calculate the amount of CO2 that would be produced if all of the limiting reagent were consumed. We can do this by comparing the amount of CO2 that would be produced by each reagent and identifying the one that produces the smaller amount:

Using C as the limiting reagent:

Moles of CO2 produced = Moles of C = 0.155 moles

Using O2 as the limiting reagent:

Moles of CO2 produced = Moles of O2 × (1 mole CO2 / 1 mole O2) = 0.117 moles × (1 mole CO2 / 1 mole O2) = 0.117 moles

Since the amount of CO2 produced by the reaction with C is greater than the amount produced by the reaction with O2, we can conclude that O2 is the limiting reagent for this problem. Therefore, only 0.117 moles of CO2 could be produced based on the available amount of O2, and any excess C would be left over after the reaction.

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Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr) are in the same column in the periodic table because they all belong to the alkali metal group (Group 1) and have similar chemical properties.

This is due to each of these elements having one electron in their outermost energy level (valence electron). As elements in the same column share the same number of valence electrons, they exhibit similar reactivity and bonding patterns.

The elements in this group share several chemical properties, which is why they are all placed in the same column in the periodic table.

The alkali metals are all very reactive, meaning they have a tendency to react with other elements to form compounds. They are also all soft metals, meaning they can be easily cut or shaped. In terms of their physical properties, alkali metals have low melting and boiling points and are good conductors of heat and electricity.

In terms of their electronic configuration, the alkali metals all have one valence electron. This means that they all have similar chemical properties. For example, they are all very reactive with halogens such as chlorine and fluorine, and they all react with water to form hydrogen gas and an alkali metal hydroxide.

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Question :-

A gas experiences a temperature of 49.3 °C and a pressure of 893 mm Hg. By changing the pressure If it is increased to 778 mm Hg, what is the new temperature of the gas?

Solution :-

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow \sf \underline{ \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}}\\[/tex]

[tex] \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf \dfrac{T_2}{P_2} = \dfrac{T_1}{P_1}\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow \sf \underline{T_2 = \dfrac{T_1}{P_1}\times P_2}\\[/tex]

(Volume is constant )

Where-

As per question, we are given -

We are given the initial temperature in °C.So, we first have to convert the temperature in Celsius to kelvin by adding 273-

[tex]\sf T_1[/tex] = 49.3+ 273 = 322.3 K

Now that we have obtained all the required values, so we can put them into the formula and solve for T₂:

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow \sf\underline{ T_2 = \dfrac{T_1}{P_1}\times P_2}\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow \sf T_2 = \dfrac{322.3}{893}\times 778\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow \sf T_2 = 0.361 \times 778\\[/tex]

[tex] \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf T_2= 280.856...... K\\[/tex]

[tex] \:\:\:\:\:\:\:\:\:\:\:\:\longrightarrow \sf T_2= (280.86 - 273)\: °C\\[/tex]

[tex]\:\:\:\:\:\: \:\:\:\:\:\:\longrightarrow \sf \underline{T_2 = 7.8 \:°C}\\[/tex]

Answer:

19.56160744 g F2 = 19.6 grams F2

Explanation:

Molar mass of F2: 2(19.00)=38.00 g/mol

Atoms --avogadro's number--> moles --molar mass--> grams

The pH of the resulting solution after the addition of 13.0 mL of 0.100 M HCl is 4.7. This indicates that the solution is acidic and that there is still some of the weak acid HA remaining in the solution.

The addition of the strong acid HCl will react with the weak base A- produced during the titration, forming the weak acid HA and neutralizing some of the OH- ions present. This will result in a lower pH than the pH at the equivalence point, and the difference between the two pH values can be used to calculate the dissociation constant (pKa) of the weak acid.

At the equivalence point, the pH is determined by the dissociation constant (Ka) of the weak acid. In this case, the pale-pink phenolphthalein endpoint indicates that the pH at the equivalence point is approximately 8.5-9.5.

Since the pH at the equivalence point is higher than the pH of 4.7 after the addition of HCl, the weak acid must be less dissociated at the latter pH.

This means that the pKa of the weak acid is higher than the pH of 4.7, because a higher pKa corresponds to a weaker acid and a lower degree of dissociation.

Therefore, we can conclude that the pKa of the unknown weak acid HA is greater than 4.7, based on the pH of the resulting solution after the addition of HCl.

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Answer: ν= [tex]6.01 * 10^{20[/tex] hz

Explanation:

speed of light (c) = wavelength * frequency

[tex]3*10^8 = 499 * 10^{-9} *[/tex] ν

ν= [tex]6.01 * 10^{20[/tex] hz

The speed of light is described as the product of the wavelength and frequency of the light wave. Every color of the spectrum corresponds to a different wavelength and frequency.

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The combination of elements that will be most likely to form an ionic compound is one where there is a large difference in electronegativity between the two atoms. This is because ionic bonds are formed when there is a transfer of electrons from one atom to another, resulting in the formation of cations and anions.

In general, metal atoms tend to have low electronegativities, while nonmetal atoms tend to have high electronegativities. Therefore, a combination of a metal and a nonmetal is most likely to form an ionic compound.

For example, sodium (Na) is a metal with low electronegativity, while chlorine (Cl) is a non-metal with high electronegativity. When sodium and chlorine react, sodium donates its outer electron to chlorine, forming the ionic compound sodium chloride (NaCl).

Other examples of metal-nonmetal combinations that are likely to form ionic compounds include magnesium (Mg) and oxygen (O) (forming MgO), and aluminium (Al) and fluorine (F) (forming AlF3).

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To determine the volume ratio of NH4Cl and NH3 solutions required to make a buffer of a specific pH, we need to use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where:

pH = the desired pH of the buffer

pKa = the dissociation constant of the weak acid component of the buffer

[A-] = the concentration of the conjugate base (NH3) of the weak acid in the buffer

[HA] = the concentration of the weak acid component (NH4Cl) in the buffer

The pKa of NH4Cl is 9.25, so we can use this value in the Henderson-Hasselbalch equation. Let's assume that we want to make a buffer with a pH of 9.0.

At the pH of 9.0, we can calculate the ratio of [A-]/[HA] using the following equation:

[A-]/[HA] = 10^(pH - pKa)

[A-]/[HA] = 10^(9.0 - 9.25) = 0.562

Therefore, we need to mix the NH4Cl and NH3 solutions in a ratio of 0.562:1 to make a buffer with a pH of 9.0. This means that for every 0.562 units of NH3, we need 1 unit of NH4Cl to make the buffer.

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oxymercuration-demercuration of 2-methyl-2-butene gives the product 2-methyl-2-butanol.

Oxymercuration-demercuration is the process involving electrophilic activation of an alkene by a mercuric acetate group. It is followed by the  addition of water firstly and secondly, reductive demercuration by sodium borohydride.

In the first step, an electrophilic HgOAc+ ion is added to the double bond which gives a mercurinium ion .

In the second step, the species reacts with a nucleophilic water molecule. Due to this nucleophilic attack, there forms a bonding of an HgOAc group and a OH group on the adjacent carbon atoms.

The final product involves Markovnikov addition reaction where the OH group is bonded to the more substituted carbon atom of the alkene.

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The pH of a solution can be calculated from the concentration of hydroxide ions using the formula pH = -log[H+]. In this case, the pH of the solution with an [OH-] concentration of 3.94e⁻⁵ M is approximately 9.6.

The concentration of hydroxide ions [OH-] in the solution is 3.94e⁻⁵ M.

The pH of a solution can be calculated using the formula:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in the solution. To find [H+], we can use the fact that in any aqueous solution at room temperature,

[H+][OH-] = 1.0 × 10⁻¹⁴

Rearranging this equation to solve for [H+], we get:

[H+] = 1.0 × 10⁻¹⁴ / [OH-]

Substituting the given value for [OH-], we get:

[H+] = 1.0 × 10⁻¹⁴ / 3.94e⁻⁵

[H+] = 2.54 × 10⁻¹⁰ M

Now we can use this value to calculate the pH:

pH = -log[H+]

pH = -log(2.54 × 10⁻¹⁰)

pH = 9.595

Therefore, the pH of the solution is approximately 9.6.

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Based on the electronegativities of 2.1 for H and 2.5 for I, we can predict that HI (hydrogen iodide) would be expected to be a polar covalent molecule, with the iodine atom having a partial negative charge (δ-) and the hydrogen atom having a partial positive charge (δ+).

This is because electronegativity is the measure of an atom's ability to attract shared electrons in covalent bond. In the HI molecule, the iodine atom has a higher electronegativity than the hydrogen atom, which means it has a greater ability to attract the shared electrons in the covalent bond toward itself.

As a result, the electrons in the HI molecule will be more strongly attracted to the iodine atom, causing the iodine atom to have a partial negative charge and the hydrogen atom to have a partial positive charge.

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Answer: Soil

Explanation:

Each face of the cube has an identical area, which is the same as a square whose side length is equal to the cube's edge length.

The cube's area on each face is given by its 1 meter-long edges as follows:

The cube's face area is equal to the product of its edge length and a square of one meter.

As a result, the cube's faces each have an area of 1 square meter.

Squaring the side's length yields the area of each face. To get the cube's total surface area, multiply the area of each face by the number of faces.

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Nitrogen gas will effuse about 2.16 times faster than xenon gas under these conditions.

The rate of effusion of a gas will be inversely proportional to square root of its molar mass. This is known as Graham's law of effusion. Mathematically, we will express this relationship as:

rate of effusion ∝ 1/√(molar mass)

Let's assume that the temperature and pressure of the gases are kept constant. The molar mass of nitrogen gas (N₂) is 28 g/mol, and the molar mass of xenon gas (Xe) is 131 g/mol. Therefore, the ratio of their molar masses will be;

molar mass of Xe / molar mass of N₂ = 131 g/mol / 28 g/mol = 4.68

According to Graham's law of effusion, the ratio of their effusion rates is the inverse of the ratio of their square roots of their molar masses. This can be expressed as;

rate of effusion of N₂ / rate of effusion of Xe = √(molar mass of Xe) / √(molar mass of N₂) = √4.68 = 2.16

Therefore, 2.16 times faster will the nitrogen effuse.

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a. 2.0 miles downhill

This is because the path taken by the camper appears to go primarily downhill and is relatively short in distance. However, the actual distance may be more or less than 2.0 miles depending on the scale of the diagram.

The answer is (B) The city must ensure that they are aware of the effects on animals. They will have the knowledge they need from the study to balance the project's advantages and disadvantages.

By removing trees from the forest, birds, reptiles, and insects lose their habitats and food supplies, which results in a fall in the number of wild creatures. Small mammals, a source of food for mid- and large-sized mammals, will be impacted by this. The extinction of species is the result of a chain reaction.

Soil erosion increases as a result of deforestation. The loss of crops and fertile land is just one of the devasting repercussions of soil erosion on the environment.

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Answer:

To make Kool-Aid ice cubes, you must be slightly below 0°C (32°F) to freeze the liquid into solid ice cubes. The freezing point of water is 0°C (32°F), but adding Kool-Aid powder to water lowers its freezing point. However, the exact freezing point would depend on the Kool-Aid mix's sugar content and other ingredients. In general, the more sugar and other additives in the Kool-Aid mix, the lower the freezing point of the liquid.

We can use the ideal gas law to solve this problem:

PV = nRT

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

First, we need to calculate the number of moles of CO2 using its molar mass:

molar mass of CO2 = 12.01 + 2(15.99) = 44.01 g/mol

moles of CO2 = 20.0 g / 44.01 g/mol = 0.454 mol

Next, we can rearrange the ideal gas law to solve for V:

V = (nRT) / P

V = (0.454 mol)(8.31 J/(mol·K))(298 K) / (105 kPa) = 10.5 L

Therefore, 20.0 g of CO2 would occupy a volume of 10.5 L at a temperature of 25°C and a pressure of 105 kPa.

Answer:

I'm sorry, but it's not correct to say that nitric acid (HNO3) reacts with aqueous potassium rubidium sulfide to form hydrogen sulfide gas.

Potassium rubidium sulfide is not a known compound. Potassium sulfide and rubidium sulfide are two different compounds, and they have different chemical formulas and properties. Also, neither of them reacts with nitric acid to form hydrogen sulfide gas.

If you have any other chemistry questions, I'd be happy to help!

Explanation:

The correct answer is B) The particles absorb heat and spread farther apart.

When a liquid evaporates, the particles at the surface of the liquid gain enough energy (usually in the form of heat) to overcome the attractive forces between them and escape into the air as a gas. This energy breaks the intermolecular bonds between the liquid particles and allows them to move more freely.

The absorption of heat causes an increase in the kinetic energy of the particles, which makes them move faster and collide with each other more frequently. These collisions help to break the intermolecular bonds between the liquid particles.

As more and more particles escape from the surface of the liquid, the concentration of the liquid decreases, and eventually, the liquid can completely evaporate into a gas. The escaped particles also carry away some of the energy from the liquid, which is why the evaporation process cools down the remaining liquid and its surroundings.

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This equation shows that when hydrochloric acid (HCl) reacts with calcium hydroxide (Ca(OH)2), calcium chloride (CaCl2) and water (H2O) are produced.

Therefore, the H2O component in the reaction can be described as 2 molecules of water (2H2O), as shown in the balanced equation. Option A, "2 molecules H2O", is the correct way to describe the H2O component in the reaction.

2HCl(aq) + Ca(OH)₂ (aq) ⇒ A. 2 molecules H₂O B.

Option B, "1 molecule H2O", is incorrect as two molecules of water are produced in the reaction, not one.

Option C, "2 LH2O", is also incorrect as the symbol "L" is not used to represent water molecules in chemical equations.

Option D, "4 moles H2" is also incorrect as hydrogen gas (H2) is not produced in this reaction.

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