A pyrotechnician mixes 280 g of black powder for a firework. Find the amount of oxygen, carbon dioxide, and sulfur dioxide generated when this firework bursts, if the oxidizing agent in the powder is saltpeter.

The Keq for the interconversion for the two chair conformers of methylcyclohexane at 25 °C is 18. The % of the chair conformers having an axial methyl group is A) 95%.

If the value of Keq is higher than 1, that means the reaction is favored in the forward direction. If the value of Keq is lower than 1, that means the reaction is favored in the reverse direction.If the value of Keq is equal to 1, that means the reaction is at equilibrium.Methylcyclohexane is an example of the cyclohexane molecule in which there is a substitution of a methyl group on one of the six carbon atoms in the ring structure. The two chair conformers of methylcyclohexane are the axial and equatorial conformers, in which the methyl group is either in an axial or equatorial position, respectively.

The percentage of chair conformers having an axial methyl group can be calculated using the following formula:

% axial conformer = Keq / (1+Keq) × 100

Putting the value of Keq in the formula:

axial conformer = 18 / (1+18) × 100%

axial conformer = 18/19 × 100%

axial conformer = 94.7%

The value of percentage has been rounded off to the nearest whole number, which is 95. Therefore, the answer is (A) 95.

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NaOH + HNO₃ ----> ?

This is a double replacement reaction. The general equation for double replacement reactions is:

AB + CD ----> AD + BC

To predict the products of this reaction we have to "exchange" the ions. Also, when an acid reacts with an hydroxide, we produce a salt and water.

sodium hydroxide + nitric acid -----> sodium nitrate + water

NaOH + HNO₃ -----> NaNO₃ + H₂O

To determine if the equation is balanced we have to find the number of atoms of each element that we have on both sides of the equation.

NaOH + HNO₃ -----> NaNO₃ + H₂O

Na: 1 Na: 1

O: 4 O: 4

H: 2 H: 2

N: 1 N: 1

We have the same amount of atoms of each element on both sides of the equation. Then the equation is balanced.

Answer: NaOH + HNO₃ -----> NaNO₃ + H₂O

A gas sample has a volume of 126ml at 58.0°C  then the volume of the gas at 118°C  is  148.8 ml .

Calculation ,

Formula used : \(V_{1} /V_{2} =T_{1} /T_{2}\)

Where , V is volume and T is temperature

Given initial Volume of gas sample  \(V_{1}\) =  126 ml

Final volume of gas sample  \(V_{2}\) = ?

Initial temperature of gas sample \(T_{1}\) = 58.0°C = 58.0  + 273 = 331 K

Final temperature of  gas sample  \(T_{2}\) = 118°C = 118 + 273 = 391 K

Putting the value of  initial volume , Initial temperature and Final temperature in equation ( i ) we get

126ml / \(V_{2}\)  = 331 K/391 K

\(V_{2}\)  = 126ml × 391 K/  331 K = 148.8 ml = 0.148 L

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Synthesis reaction

It is a reaction in which 2 or more reactants combine with each other to form one product .

Check option C

Sulphate and water are combining to form sulfuric acid .

Hence option C is correct

Answer:

SO3 + H2O => H2SO4

Explanation:

I took the test :)

The correct list that corresponds to the ionization energy of silicon is; 780 kJ, 1575 kJ, 3,220 kJ 4,350 kJ, 16, 100 kJ  

Ionization energy is the energy required to remove electrons from an atom. The number of ionization energies theoretically possible in an atom depends on the number of electrons in the atom.

However, the energy required to remove electrons from a shell in an atom increases progressively.

The second ionization energy is higher than the first ionization energy. The third ionization energy is higher than the second ionization energy and so on.

A final word, the ionization energies for electrons on the valence shell are closer to each other. However, if we go beyond the first shell into the inner shells, there is a sudden tremendous increase in ionization energy.

This jump occurs because more energy is required to remove inner electrons than is required to remove valence electrons.

We see this in silicon, the fourth ionization energy is 4,350 kJ while the fifth ionization energy of silicon is 16, 100 kJ for the reason explained above.

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Answer: 13.6

Explanation:

Answer:

13.6

Explanation:

Answer:

electrical and heat energy

Explanation:

Answer:

Heat and Light

Explanation:

C on usatp

Answer:

Hey mate......

Explanation:

This is ur answer.....

To combat climate change, the world must rapidly reduce its dependency on fossil fuels to reduce greenhouse gas emissions. Nuclear energy is low-carbon and can be deployed on a large scale in the time frame required, supplying the world with clean and affordable electricity.

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Brainliest pls!

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The substance with the highest viscosity among the given options is c) HOCH2CH2CH2CH2OH (1-butanol).

Option c) HOCH2CH2CH2CH2OH, or 1-butanol, has the maximum viscosity of the chemicals provided. The resistance to the flow of a fluid is measured by its viscosity, which is controlled by intermolecular forces, molecular size, and shape. The largest molecular weight in this situation is that of 1-butanol, which also has a somewhat long and flexible carbon chain. Higher viscosity is a result of these properties' contribution to increased intermolecular forces. In comparison to 1-butanol, the other options—(CH3CH2)2CO (acetone), C2H4Cl2 (1,2-dichloroethane), CCl4 (carbon tetrachloride), and C6H14 (hexane)—have lower molecular weights or intermolecular interactions.

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Assume that your reaction is exothermic. Heat is released into the environment, increasing the entropy of the environment.

How to Calculating the entropy change of the surroundings ?

So far, you've learned how to calculate the entropy change of a system for a given reaction given the entropies of all the substances involved.The entropy change of the surroundings can be calculated using a simple equation. ΔH denotes the reaction's enthalpy change. The letter T stands for temperature.That appears simple, but there is a major trap to avoid, and if you can get through your course without falling into it at least once, you will have done exceptionally well!

The units of enthalpy change and entropy change are mismatched. When you quote figures for enthalpy change, the energy units will be kJ. However, entropy change is measured in energy units of J.

That is, if you want to calculate entropy change, multiply the enthalpy change value by 1000. So, if you have an enthalpy change of -92.2 kJ mol-1, you must enter -92200 J mol-1 into the equation. If the temperature was 298 K

For example, if the reaction's (the system's) entropy change was +112 J K-1 mol-1, the total entropy change would be

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Answer: I need a pic

Explanation:

photo?

The temperature of the gas is approximately 374 K.

The temperature of a gas can be calculated using the formula \(PV = nRT\),

where \(P\) represents the pressure of the gas in atm,

\(V\) represents the volume of the gas in L (converted from mL by dividing by 1000),

\(n\) represents the number of moles of the gas,

\(R\) is the universal gas constant (0.0821 L·atm/mol·K), and

\(T\) represents the temperature of the gas in Kelvin.

Rearranging the equation, we have \(T = \frac{PV}{nR}\).

\(P = 2.21\) atm

\(V = 6.850\) mL = \(6.85\) L

\(n = 0.750\) mol

\(R = 0.0821\) L·atm/mol·K

Substituting the given values into the equation, we get:

\(T = \frac{(2.21 \, \text{atm}) \times (6.85 \, \text{L})}{(0.750 \, \text{mol}) \times (0.0821 \, \text{L·atm/mol·K})}\)

Calculating the expression, we find:

\(T \approx 374 \, \text{K}\)

Therefore, the temperature of the gas is approximately 374 K.

This calculation demonstrates the relationship between the pressure, volume, temperature, and amount of gas using the ideal gas law equation.

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The given element decays at a constant rate of 6% per year. Starting with 20 grams, it will take approximately 8.75 years for only four grams of the element to remain.

To find the time it takes for the element to decay to four grams, we can set up an exponential decay equation. Let t represent the time in years and P(t) represent the amount of the element remaining at time t.

The exponential decay equation is given by:

P(t) = P₀ * (1 - r)^t,

where P₀ is the initial amount, r is the decay rate (in decimal form), and t is the time in years.

In this case, the initial amount P₀ is 20 grams, and the decay rate r is 6% or 0.06. We want to find the time t when the amount P(t) is equal to four grams.

Substituting the given values into the equation, we have:

4 = 20 * (1 - 0.06)^t.

Simplifying the equation, we get:

0.2 = 0.94^t.

To solve for t, we can take the natural logarithm of both sides:

ln(0.2) = ln(0.94^t).

Using the logarithmic property, we can bring the exponent down:

ln(0.2) = t * ln(0.94).

Dividing both sides by ln(0.94), we find:

t ≈ ln(0.2) / ln(0.94).

Using a calculator, we can evaluate this expression to find t ≈ 8.75 years. Therefore, it will take approximately 8.75 years for the element to decay to only four grams.

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0.0114 g of solid Sodium hydroxide (NaOH) must be added to 1.0 L of a 0.14 M H2CO3 solution to produce a solution with [H+] of 3.5×10−11 M.

Lye and caustic soda are other names for sodium hydroxide, an inorganic substance having the formula NaOH. It is a white, solid ionic substance made up of the cations sodium (Na+) and the anions hydroxide (OH).

Contact with very high sodium hydroxide concentrations can result in fatal or severe burns to the eyes, skin, lungs, digestive system, or eyes. Skin contact that is prolonged or repetitive may result in dermatitis. Repeated lung injury from inhaling sodium hydroxide vapour is possible.

H2CO3 + 2NaOH → Na2CO3 + 2H2O

C H2CO3 = 0.14 M

V sln = 1 L

[H3O+] = 3.5 E-11 M

pH = - Log [H3O+]

pH = 10.456

14 = pH + pOH

pOH = 3.544

[OH-] = 2.8571 E-4 M

C NaOH = [OH-]

C NaOH = 2.8571 E-4 M

mol NaOH = (2.8571 E-4 mol/L)*( 1 L ) = 2.8571 E-4 mol

molar mass NaOH = 39.997 g/mol

mass NaOH = (2.8571 E-4 mol)*(39.997 g/mol) = 0.0114 g

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The wavelength of light emitted during the transition of a hydrogen atom from \(n(initial) = 5\) to \(n(final) = 4\) is 4052.35 nm, rounded to four significant figures.

The wavelength of light emitted during the transition of an electron from a higher energy level to a lower energy level in a hydrogen atom can be calculated using the Rydberg formula: \(1/λ = R (1/n(final)*2 - 1/n(initial)*2)\), where λ is the wavelength of light emitted, R is the Rydberg constant, and n(final) and n(initial) are the final and initial energy levels, respectively. In this problem, we are given that the initial energy level is \(n(initial) = 5\) and the final energy level is \(n(final) = 4\). Substituting these values into the Rydberg formula and using the value of the Rydberg constant, we get: 1/λ  Therefore, the wavelength of light emitted during the transition of a hydrogen atom from n(initial) = 5 to n(final) = 4 is 4052.35 nm, rounded to four significant figures.

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Answer:

The answer is a compound.

it is a compound as it contains different elements

Explanation:

Answer:

Explanation:

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According to EarthObservatory, The Earth’s mantle is mostly made of solid rock. The misconception of a liquid mantle arises from expressions like “a subducted tectonic plate sinks into the mantle” or “continental drift”, expressions that implicitly refer to the liquid element.

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The order of increasing wavenumber for the bonds is: single bonds < double bonds < triple bonds. This reflects the relative strengths of the bonds, with triple bonds being the strongest and single bonds being the weakest.

The wavenumber of a bond in a molecule is directly proportional to the frequency of its vibration. Stronger bonds vibrate at higher frequencies, and weaker bonds vibrate at lower frequencies.

Using this information, we can rank the bonds identified in order of increasing wavenumber as follows:

1. Single bonds: These bonds are the weakest and vibrate at the lowest frequency, so they have the lowest wavenumber.

2. Double bonds: These bonds are stronger than single bonds and vibrate at a higher frequency, so they have a higher wavenumber.

3. Triple bonds: These bonds are the strongest and vibrate at the highest frequency, so they have the highest wavenumber.

Therefore, the order of increasing wavenumber for the bonds is single bonds < double bonds < triple bonds. This order reflects the relative strengths of the bonds, with triple bonds being the strongest and single bonds being the weakest.

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Answer:

2Sb2O3 + 3O2 -> 2Sb4O6

The coefficients indicate the number of moles of each element that participate in the reaction. The coefficients are chosen so that the number of atoms of each element on both sides of the equation is equal.

the concentration (m) of sodium ions in the diluted solution is approximately 0.115 M.

To calculate the concentration (m) of sodium ions in the diluted solution, we need to consider the dilution equation:

M1V1 = M2V2

Where:

M1 = initial concentration of the solution

V1 = initial volume of the solution

M2 = final concentration of the solution

V2 = final volume of the solution

Given:

M1 = 0.574 M (initial concentration)

V1 = 30.0 mL (initial volume)

V2 = 150 mL (final volume)

To find M2, we rearrange the equation:

M2 = (M1 * V1) / V2

Substituting the given values:

M2 = (0.574 M * 30.0 mL) / 150 mL = 0.1148 M

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Polar molecules' poles point in the direction of the oppositely charged metal plate when they are sandwiched between the plates.

Positive and negative poles are found in opposite poles in polar molecules. For instance, water molecules will have their negative pole facing the positive end and vice versa when they are placed between two metal plates that have opposing charges.

The charges on the metal plate will force them to align themselves since opposing charges repel one another and like charges attract.

Therefore, when polar molecules are sandwiched between two metal plates with opposing charges, the poles will point in the direction of the plate with the opposite charge.

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Answer:

tundra bc it has barley any food source and has vary little inhabitants

Explanation:

Answer:

a patch of lichens on bare rock

0.129569. You have to divide the mass value by 1000.

Answer:

6.022 x 10²³

Explanation:

602,200,000,000,000,000,000,000

start counting spots from right to left till you get 6.022

you counted 23 spots and that's the power of 10

finally 6.022 x10²³

Avogadro's number is the number of units in one mole of any given substance.

The scientists are most likely studying precipitation (Option D).

In meteorology, precipitation is any result of atmospheric water vapor condensation that falls under the gravitational attraction of clouds. Drizzle, rain, sleet, snow, ice pellets, graupel, and hail are the most common types of precipitation.

Rain gauges and snow gauges are two forms of precipitation measuring instruments, and several versions are created depending on the use. This chapter discusses rain gauges. Rain gauges are divided into two types: recording and non-recording.

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The triple point can be seen from the graph that has been attached here.

The triple point is a special combination of temperature and pressure where the equilibrium of a substance's three phases—solid, liquid, and gas—occurs. The transition between phases happens with no discernible net change in the substance because the solid, liquid, and gas phases are in perfect equilibrium at the triple point.

A crucial reference point in thermodynamics, the triple point is frequently used to specify temperature scales and calibrate thermometers. Each substance has a specified value for temperature and pressure.

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