How are a moon and an asteroid different? (2 points)

a
A moon revolves around an asteroid, while an asteroid rotates around its axis.

b
A moon revolves around a planet, while an asteroid revolves around a star.

c
A moon revolves around a star, while an asteroid rotates around its axis.

d
A moon rotates around its axis, while an asteroid revolves around a planet.

Increasing the temperature will cause the equilibrium to shift towards the products, favoring the formation of more iodine atoms (I(g)). Decreasing the temperature will cause the equilibrium to shift towards the reactants, favoring the reformation of iodine molecules (I2(g)).

a) Increasing the temperature:

The equilibrium will shift towards the products.

In an endothermic reaction, increasing the temperature can be considered as adding energy to the system.

According to Le Chatelier's principle, when the temperature is increased, the equilibrium will shift in the direction that absorbs or consumes heat to counteract the temperature rise.

In this case, since the reaction is endothermic (absorbs heat), the forward reaction is favored.

The balanced equation for the reaction is:

I2(g) ⇌ 2I(g)

When the temperature is increased, the system will try to counteract the temperature rise by favoring the reaction that absorbs heat. In this case, the forward reaction is the one that absorbs heat (endothermic). Therefore, the equilibrium will shift towards the products (2I(g)) to consume the excess heat.

Increasing the temperature will cause the equilibrium to shift towards the products, favoring the formation of more iodine atoms (I(g)).

b) Decreasing the temperature:

The equilibrium will shift towards the reactants.

In an endothermic reaction, decreasing the temperature can be considered as removing energy from the system.

According to Le Chatelier's principle, when the temperature is decreased, the equilibrium will shift in the direction that releases heat to counteract the temperature drop.

In this case, since the reaction is endothermic (absorbs heat), the reverse reaction is favored.

The balanced equation for the reaction is:

I2(g) ⇌ 2I(g)

When the temperature is decreased, the system will try to counteract the temperature drop by favoring the reaction that releases heat.

In this case, the reverse reaction is the one that releases heat (exothermic). Therefore, the equilibrium will shift towards the reactants (I2(g)) to generate more heat.

Decreasing the temperature will cause the equilibrium to shift towards the reactants, favoring the reformation of iodine molecules (I2(g)).

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Answer:

dfdfaxc b

Explanation:

The reagent that would not react with stearic acid is Lithium Aluminium Hydride (LAH).

Stearic acid is a saturated fatty acid consisting of eighteen carbon atoms. In organic chemistry, stearic acid is a common reagent that reacts with other reagents to create a range of useful compounds. In this question, we will discuss which of the following reagents would not react with stearic acid.The four reagents given are: H2, Ni; SOCl2; CH3MgI; NH3/H2O; and LAH.LAH (Lithium Aluminium Hydride) is the reagent that would not react with stearic acid. Lithium Aluminium Hydride (LAH) is a strong reducing agent that reduces carboxylic acids into alcohols. However, stearic acid, being a saturated fatty acid, does not contain any double bonds that can be reduced by the strong reducing agent LAH. Therefore, it does not react with stearic acid.The other reagents mentioned such as H2, Ni, SOCl2, CH3MgI, NH3/H2O all react with stearic acid, and would give different products depending on the reaction conditions and reagents used. Hence, the reagent that would not react with stearic acid is Lithium Aluminium Hydride (LAH).

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HF is classified as a weak acid because it only partially dissociates into ions when dissolved in water, and its relatively low Ka value confirms its limited ionization and weaker acid properties.

Hydrofluoric acid (HF) is classified as a weak acid. The classification of acids as strong or weak depends on their ability to dissociate into ions when dissolved in water. Strong acids readily dissociate completely into ions, while weak acids only partially dissociate.

HF is a weak acid because it does not fully dissociate into H+ ions and F- ions when dissolved in water. Instead, only a fraction of HF molecules dissociate, resulting in a small concentration of H+ ions in solution.

This limited dissociation is due to the strength of the bond between hydrogen and fluorine in HF. The bond is relatively strong, requiring a significant amount of energy to break, and as a result, the dissociation of HF is incomplete.

The Ka value of HF, listed as 6.6 x 10^−4, further supports its classification as a weak acid. Ka is the acid dissociation constant and provides a measure of the extent of dissociation of an acid in solution. A lower Ka value indicates weaker acid strength and a smaller degree of dissociation.

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The reaction of 1,3-cyclohexadiene and maleic acid (cis-2-butenedioic acid) leads to the formation of a cycloadduct known as a Diels-Alder adduct. The structure of the product is a cyclohexene ring fused with a carboxylic acid group.

The Diels-Alder reaction is a powerful organic transformation that involves the reaction of a conjugated diene (such as 1,3-cyclohexadiene) with a dienophile (such as maleic acid). In this reaction, the diene acts as a nucleophile and attacks the electron-deficient dienophile, resulting in the formation of a cyclic product.

When 1,3-cyclohexadiene reacts with maleic acid, the diene's double bonds undergo cycloaddition with the double bonds of maleic acid, forming a new six-membered ring. The resulting product is a cyclohexene ring fused with a carboxylic acid group. The stereochemistry of the product depends on the orientation of the dienophile. In the case of cis-2-butenedioic acid (maleic acid), the product would have a cis configuration.

The exact structure of the product would require more specific information about the reaction conditions and any other substituents present. However, based on the reactants provided, the reaction of 1,3-cyclohexadiene and maleic acid would yield a Diels-Alder adduct, consisting of a fused cyclohexene ring and a carboxylic acid group in a cis configuration.

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the answer is 76.01g/mol

and the density:1.4g/cm³

Answer:

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we're finding the new pressure

[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]

We have

[tex]P_2 = \frac{27 \times 759}{11.4} = \frac{20493}{11.4} \\ = 1797.631....[/tex]

We have the final answer as

Hope this helps you

Approximately 4.44 × [tex]10^{26[/tex] photons of this microwave radiation must be absorbed to warm 250 mL of water from 23.1 ºC to its boiling point .

a. To calculate the energy of a single photon of microwave radiation, we can use the equation E = hc/λ, where E is the energy of the photon, h is Planck's constant (6.626 × 10^-34 J·s), c is the speed of light (2.998 × 10^8 m/s), and λ is the wavelength of the radiation.

Converting the wavelength to meters, we have λ = 12.2 cm = 0.122 m.

Using the equation, E = (6.626 × 10^-34 J·s × 2.998 × 10^8 m/s) / 0.122 m = 1.632 × 10^-24 J.

Therefore, the energy of a single photon of this microwave radiation is 1.632 × 10^-24 J.

b. To calculate the number of photons required to warm 250 mL of water, we need to determine the heat energy required to raise the temperature from 23.1 ºC to its boiling point (100 ºC). The heat energy can be calculated using the formula Q = mcΔT, where Q is the heat energy, m is the mass of water, c is the specific heat capacity of water (4.184 J/g·ºC), and ΔT is the change in temperature.

First, we need to convert the mass of water to grams. Since 1 mL of water is approximately equal to 1 gram, 250 mL of water is equal to 250 grams.

Next, we calculate the heat energy:

Q = (250 g) × (4.184 J/g·ºC) × (100 ºC - 23.1 ºC) = 723,280 J.

To find the number of photons, we divide the total energy (723,280 J) by the energy of a single photon:

Number of photons = 723,280 J / (1.632 ×[tex]10^{-24[/tex] J) ≈ 4.44 × 10^26 photons.

Converting the wavelength to meters, we have λ = 12.2 cm = 0.122 m.

Using the equation, E = (6.626 × [tex]10^{-34[/tex] J·s × 2.998 × [tex]10^8[/tex] m/s) / 0.122 m = 1.632 × [tex]10^{-24[/tex] J.

Therefore, the energy of a single photon of this microwave radiation is 1.632 × [tex]10^{-24[/tex] J.

b. To calculate the number of photons required to warm 250 mL of water, we need to determine the heat energy required to raise the temperature from 23.1 ºC to its boiling point (100 ºC). The heat energy can be calculated using the formula Q = mcΔT, where Q is the heat energy, m is the mass of water, c is the specific heat capacity of water (4.184 J/g·ºC), and ΔT is the change in temperature.

First, we need to convert the mass of water to grams. Since 1 mL of water is approximately equal to 1 gram, 250 mL of water is equal to 250 grams.

Next, we calculate the heat energy:

Q = (250 g) × (4.184 J/g·ºC) × (100 ºC - 23.1 ºC) = 723,280 J.

To find the number of photons, we divide the total energy (723,280 J) by the energy of a single photon (1.632 × [tex]10^{-24[/tex] J):

Number of photons = 723,280 J / (1.632 × [tex]10^{-24[/tex] J) ≈ 4.44 × [tex]10^{26[/tex] photons.

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Answer:

Limited Genetic Variability

Explanation:

its 3

Answer:

metal or other acids

Explanation: hope u get it right

Answer: B

Explanation:

B. It is correct because iron is more reactive than silver [1]. When iron (III) nitrate solution comes in contact with silver, the iron ions and silver ions will exchange. The more reactive metal will displace the less reactive metal from its compound. In this case, iron is more reactive than silver, so iron ions will displace silver ions from silver nitrate to form iron nitrate and silver. This reaction will produce iron nitrate and silver as products [2][3].

The prediction made by Niko, stating that iron and silver nitrate will form when silver is placed into an iron (III) nitrate solution, is incorrect. This is because silver is less reactive than iron, and the reaction should not produce iron and silver nitrate as products.

The prediction made by Niko is incorrect. When evaluating the reactivity of metals, it is important to consider the reactivity series. The reactivity series ranks metals based on their tendency to undergo redox reactions. In the reactivity series, iron is typically more reactive than silver.

Iron (III) nitrate is a compound consisting of iron ions  and nitrate ions . Silver nitrate, on the other hand, consists of silver ions and nitrate ions . When silver is placed into an iron (III) nitrate solution, a single replacement reaction can occur. However, since silver is less reactive than iron according to the reactivity series, it cannot displace iron from its compound.

Instead, if a reaction occurs, it would involve the displacement of silver by iron, resulting in the formation of iron nitrate and the deposition of silver metal. The correct prediction would be that iron displaces silver, not the formation of iron and silver nitrate as suggested by Niko.

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Answer:

[tex]\boxed {\boxed {\sf 0.54 \ mol \ Cl_2}}[/tex]

Explanation:

A mole is any quantity of a substance that contains 6.02 × 10²³ particles. At standard temperature and pressure, or STP, 1 mole of as is equal to 22.4 liters. This is true for any gas, regardless of the specific kind.

Although it is not specified, we can assume this gas is at STP. Let's set up a ratio using this information: 22.4 L/mol

[tex]\frac {22.4 \ L \ Cl_2}{1 \ mol \ Cl_2}[/tex]

Multiply by the given number of liters: 12

[tex]12 \ L \ Cl_2 *\frac {22.4 \ L \ Cl_2}{1 \ mol \ Cl_2}[/tex]

Flip the ratio so the liters of chlorine cancel.

[tex]12 \ L \ Cl_2 * \frac {1 \ mol \ Cl_2}{22.4 \ L \ Cl_2}[/tex]

[tex]12 * \frac {1 \ mol \ Cl_2}{22.4 }[/tex]

[tex]\frac {12}{22.4 } \ mol \ Cl_2[/tex]

[tex]0.53571428571 \ mol \ Cl_2[/tex]

The original measurement of liters has 2 significant figures, so our answer must have the same.

For the number we found, that is the hundredth place.

The 5 in the thousandth place tells us to round the 3 up to a 4.

[tex]0.54 \ mol \ Cl_2[/tex]

12 liters of chlorine gas at STP is approximately 0.54 moles of chlorine gas.

Oxygen is likely to decrease in a small, shallow tide pool at low tide.

When the tide goes out, the water in a tide pool becomes shallower and more exposed to the sun. This causes the water to heat up and the oxygen levels to decrease. The decrease in oxygen can be harmful to the organisms that live in the tide pool, as they need oxygen to survive.

The other properties are not likely to decrease in a small, shallow tide pool at low tide. Carbon dioxide levels may increase as the water heats up, but they are not likely to decrease.

Temperature is likely to increase, not decrease. Acidity is not likely to change significantly. Salinity is also not likely to change significantly.

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Answer:

Aluminium is ordinarily classified as a metal. It is lustrous, malleable and ductile, and has high electrical and thermal conductivity. Like most metals, it has a close-packed crystalline structure and forms a cation in an aqueous solution.

The appropriate model for a combination reaction is A+B⟶C (option C)

A combination reaction represents a chemical transformation where multiple substances unite to generate a fresh entity. It follows a general format of A + B → C, with A and B acting as the reactants that undergo a fusion to yield the product C.

Combination reactions commonly exhibit exothermic characteristics, denoting the release of heat. This phenomenon arises due to the increased stability of the resultant products compared to the initial reactants.

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Answer:

C

Explanation:

Boyle's law states that "the volume of a given mass of gas is inversely proportional to its pressure at constant temperature."

Inverse proportionality means that as one quantity is increasing, the other quantity is decreasing and vice versa.

Hence, as the pressure was increased, the volume decreases accordingly in obedience to Boyle's law.

Answer:

What is TRUE about the missing volume is option C.

C. The volume will decrease due to inverse relationship of V & P

Explanation:

The given parameters of the gas are;

The initial pressure of the gas, P₁ = 2 atm

The initial volume of the gas, V₁ = 1.5 L

The final pressure of the gas, P₂ = 2 atm

Boyle's law states that, at constant temperature, the volume, 'V', of a given mass is inversely proportional to its pressure, 'P';

Mathematically, Boyle's law can be expressed as follows;

P ∝ 1/V

From which we have;

P·V = Constant

∴ P₁·V₁ = P₂·V₂

For the given gas, we get;

2 atm × 1.5 L = 6 atm × V₂

∴ V₂ = 2 atm × 1.5 L/(6 atm) = 0.5 L

Therefore, the volume decreases from 1.5 L to 0.5 L.

Answer:

1.06L = V₂

Explanation:

Charle's Law states that the volume of a gas is directly proportional to the absolute temperature when pressure remains constant.

The equation is:

V₁T₂ = V₂T₁

Where V is volume and T absolute temperature of 1, initial state and 2, final state of the gas.

V₁ = 1.83L

T₂ = -100°C + 273.15 = 173.15K

V₂ = ?

T₁ = 27°C + 273.15 = 300.15K

V₁T₂ = V₂T₁

1.83L*173.15K = V₂*300.15K

Explanation:

The balanced half-reaction for the reduction of nitrate, NO, (aq), to nitrogen gas, N.(g), in a basic solution is given below:Balanced half-reaction equationNO₃¯ → N2(g)

Step 1: Write the half-reaction equation and balance it without adding water or H⁺ or OH⁻.NO₃¯ → N2(g)

Step 2: Add water to the right-hand side of the equation to balance the oxygen.NO₃¯ → N2(g) + H2O

Step 3: Add sufficient H⁺ ions to balance the hydrogen.NO₃¯ + 10H⁺ → N2(g) + 5H2O

Step 4: Add electrons (e⁻) to balance the charges.NO₃¯ + 10H⁺ + 8e⁻ → N2(g) + 5H2OThe half-reaction for the reduction of nitrate, NO, (aq), to nitrogen gas, N.(g), in a basic solution is given by NO₃¯ + 10H⁺ + 8e⁻ → N2(g) + 5H2O.

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False. Viscosity of a polymer is not typically measured hourly; measurements depend on specific requirements.

False. The viscosity of a polymer is not typically measured on an hourly basis. Viscosity refers to the resistance of a fluid to flow, and it is generally measured under specific conditions, such as at a particular temperature or shear rate.

The viscosity of a polymer can be influenced by various factors, including molecular weight, temperature, and shear stress.

It is more common to measure the viscosity of a polymer at specific time intervals relevant to the experiment or process being studied. The frequency of measurements depends on the specific objectives and requirements of the study.

These measurements are often recorded at regular intervals, such as daily, weekly, or at specific milestones during a polymerization process.

Therefore, the statement that the viscosity of a polymer is measured hourly is false.

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Answer:

300

Explanation:

at least 300 molecules

52.5 L of oxygen will react completely with 21 L of acetylene.

Acetylene (C₂H₂) burns in oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O) according to the balanced equation:

2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g)

To solve this, we need to use the stoichiometry of the balanced equation. The ratio between acetylene and oxygen is 2:5. In other words, for every 2 moles of acetylene, we require 5 moles of oxygen.

Here, the volume of acetylene (C₂H₂) is 21 L, we can convert it to moles using the ideal gas law equation: PV = nRT. At standard temperature and pressure (STP), the molar volume of a gas is 22.4 L/mol.

21 L of C₂H₂ * (1 mol C₂H₂ / 22.4 L C₂H₂) = 0.9375 mol C₂H₂

Using the stoichiometry, we can set up a proportion to get the number of moles of oxygen:

(0.9375 mol C₂H₂) / (2 mol C₂H₂) = (x mol O₂) / (5 mol O₂)

Solving for x, the number of moles of oxygen:

x = (0.9375 mol C₂H₂ * 5 mol O₂) / (2 mol C₂H₂)

x = 2.34375 mol O₂

Finally, we can convert the number of moles of oxygen to volume using the molar volume at STP:

2.34375 mol O₂ * (22.4 L O₂ / 1 mol O₂) = 52.5 L of O₂

Therefore, 52.5 L of oxygen will react completely with 21 L of acetylene.

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Answer:

100% efficiency, this could only happen if there was not any friction Simple Machines Inclined plane, wedge, screw, lever, pulley and wheel and axel they are the most basic devices for making work easier

Explanation:

The rate of consumption of I- in the first 15.0 seconds of the reaction is 0.227 M/s.

The given balanced chemical equation is:

H2O2(aq) + 3I-(aq) + 2H+(aq) → I3-(aq) + 2H2O(l)

From the stoichiometry of the balanced equation, we can see that the ratio between I- and H2O2 is 3:1. This means that for every 1 mole of H2O2 reacted, 3 moles of I- are consumed.

In the given time interval of 15.0 seconds, the concentration of I- decreases from 1.000 M to 0.773 M. The change in concentration is:

Δ[I-] = [I-]final - [I-]initial = 0.773 M - 1.000 M = -0.227 M

To find the rate of consumption of I-, we divide the change in concentration by the time interval:

Rate = Δ[I-] / Δt = -0.227 M / 15.0 s = -0.0151 M/s

The negative sign indicates the decrease in concentration of I-. However, since rate values are usually reported as positive values, we take the absolute value:

Rate = 0.0151 M/s

Therefore, the rate of consumption of I- in the first 15.0 seconds of the reaction is 0.0151 M/s or approximately 0.227 M/s.

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A gas expands in volume from 29.3 mL to 80.1 mL at constant temperature.

(a)  The work done (in joules) if the gas expands against a vacuum is 0.

(b) The work done (in joules) against a constant pressure of 3.5 atm is -12.7 J.

(c) The work done (in joules) against a constant pressure of 10.1 atm is -36.6 J.

To calculate the work done during the expansion of a gas, we can use the formula:

Work (W) = -PΔV

Where P is the pressure and ΔV is the change in volume.

(a) If the gas expands against a vacuum, it means there is no external pressure opposing the expansion. In this case, the work done is zero because there is no pressure acting against the gas.

W = 0 (no work done against a vacuum)

(b) If the gas expands against a constant pressure of 3.5 atm, we need to convert the pressure to SI units (Pascals) before calculating the work.

Given:

Initial volume (V1) = 29.3 mL = 29.3 × 10⁻⁶L

Final volume (V2) = 80.1 mL = 80.1 × 10⁻⁶ L

Pressure (P) = 3.5 atm = 3.5 × 101325 Pa

ΔV = V2 - V1 = (80.1 × 10⁻⁶ L) - (29.3 × 10⁻⁶ L)

W = -PΔV = -(3.5 × 101325 Pa) × [(80.1 - 29.3) × 10⁻⁶) L]

W ≈ -12.7 J.

Therefore, the work done against a constant pressure of 3.5 atm is approximately -12.7 J.

(c) Similarly, for a constant pressure of 10.1 atm:

Pressure (P) = 10.1 atm = 10.1 × 101325 Pa

ΔV = V2 - V1 = (80.1 × 10⁻⁶ L) - (29.3 × 10⁻⁶) L)

W = -PΔV = -(10.1 × 101325 Pa) × [(80.1 - 29.3) × 10⁻⁶L]

W ≈ -36.6 J.

Therefore, the work done against a constant pressure of 10.1 atm is approximately -36.6 J.

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Answer:

a

Explanation:

i am wrong haha

Answer:

are u out of time ?

Explanation:

extracting energy from nuclear fuels is more expensive than extracting energy from fossil fuels

Comparing these two scenarios, we can conclude that the order of the reaction with respect to Cl₂ is 1. Therefore, the correct answer is (D) 1.

To determine the order of the reaction with respect to Cl₂, we can use the information provided about the effect of concentration changes on the initial rate.

Let's analyze the given data:

When the initial concentrations of both reactants, NO and Cl₂, are tripled, the initial rate increases by a factor of 27. This indicates that the rate is proportional to the cube of the initial concentration of both reactants.

When only the initial concentration of Cl₂ is tripled, the initial rate increases by a factor of 3. This indicates that the rate is directly proportional to the initial concentration of Cl₂.

Comparing these two scenarios, we can conclude that the order of the reaction with respect to Cl₂ is 1.

Therefore, the correct answer is (D) 1.

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When 6.0 liters of [tex]C_2H_6[/tex] are combusted, the total volume of [tex]CO_2[/tex] formed at STP is approximately 12.02 liters.

To determine the total volume of [tex]CO_2[/tex] formed when 6.0 liters of [tex]C_2H_6[/tex] are combusted, we need to use the balanced chemical equation and stoichiometry.

From the balanced chemical equation:

2 [tex]C_2H_6[/tex](g) + 7 O2(g) → 4 [tex]CO_2[/tex](g) + 6 H2O(g)

We can see that the molar ratio between [tex]C_2H_6[/tex] and [tex]CO_2[/tex] is 2:4, which simplifies to 1:2. This means that for every 2 moles of [tex]C_2H_6[/tex] combusted, 4 moles of [tex]CO_2[/tex] are produced.

To solve this problem, we need to convert the given volume of [tex]C_2H_6[/tex] to moles and then use the stoichiometry to determine the volume of [tex]CO_2[/tex] produced.

Step 1: Convert volume of [tex]C_2H_6[/tex] to moles:

Using the ideal gas law, PV = nRT, at STP (Standard Temperature and Pressure), one mole of any ideal gas occupies 22.4 liters. Therefore, 6.0 liters of [tex]C_2H_6[/tex] is equal to 6.0/22.4 = 0.268 moles of [tex]C_2H_6[/tex].

Step 2: Apply stoichiometry to find moles of [tex]CO_2[/tex]:

Since the molar ratio between [tex]C_2H_6[/tex] and [tex]CO_2[/tex] is 1:2, we multiply the moles of C2H6 by the stoichiometric coefficient ratio:

0.268 moles of [tex]C_2H_6[/tex] * (4 moles [tex]CO_2[/tex] / 2 moles [tex]C_2H_6[/tex]) = 0.536 moles of CO2.

Step 3: Convert moles of [tex]CO_2[/tex] to volume:

At STP, 1 mole of any ideal gas occupies 22.4 liters. Therefore, 0.536 moles of [tex]CO_2[/tex] is equal to 0.536 * 22.4 = 12.02 liters of [tex]CO_2[/tex].

Thus, when 6.0 liters of [tex]C_2H_6[/tex] are combusted, the total volume of [tex]CO_2[/tex] formed at STP is approximately 12.02 liters.

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The ionization energy of an atom is the amount of energy required to completely remove an electron from its ground state. In the case of a hydrogen atom in a state with quantum number n, the ionization energy is given by the following equation: Ionization energy = -13.6 eV / n^2

For a hydrogen atom in a state with quantum number n=3, the ionization energy can be calculated as follows:

Ionization energy = -13.6 eV / 3^2 = -13.6 eV / 9 = -1.51 eV

The negative sign indicates that energy is required to remove the electron. Therefore, the largest possible ionization energy of the atom in this state is 1.51 eV.

In the quantum mechanical description, the ionization energy of a hydrogen atom is given by the formula:

Ionization Energy (IE) = -13.6 eV * (1/n²)

where n is the principal quantum number. In this case, n = 3.

IE = -13.6 eV * (1/3²) = -13.6 eV * (1/9) = -1.51 eV

Since the ionization energy is negative, the largest possible ionization energy is the least negative value. Therefore, the answer is (b) 1.51 eV.

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Answer:

experiments

Explanation:

I am not sure but heres my take

Answer:

It was only after the invention of electron microscope that the idea developed