Which of the following frequencies is
equivalent to a frequency of 85,000
Hz?
A. 85 GHz
B. 85 mHz
C. 85 MHz
D. 85 kHz

The branch of chemistry that deals with the study of heat and its relationship to chemical reactions and processes is known as "thermochemistry." Thermochemistry involves the measurement and calculation of heat transfer and the study of heat changes in chemical reactions.

Calorimetry, involves the use of calorimeters, is an important tool in thermodynamics. A calorimeter is a device designed to measure the heat changes associated with chemical reactions or physical processes. It allows scientists to accurtely determine the heat absorbed or released by a substance during heating or cooling. Calorimeters work based on the principle of energy conservation. As measuring temperature changes, either directly or indirectly, the calorimeter can quantify the amount of heat gained or lost by a substance. 

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The pressure in tank X is greater than that in tank Y because the number of moles or mass of argon gas in Tank X is greater than the number of moles or mass of nitrogen gas in Tank Y.

The pressure of a gas is the force that molecules of the gas exert per unit area of the walls of their container due the collisions of the gas molecules with themselves and with the walls of their contain.

The pressure of a gas is related to the volume (V), temperature (T) and number of moles (n) of the gas by the formula:

where;

Since volume, temperature and R is constant for the two gases, the pressure difference will be determined by the number of moles of each gas.

Number of moles of a gas is proportional to the mass of the gas present.

Therefore, the best explanation as to why the pressure in tank X is greater than that in tank Y is that the number of moles or mass of argon gas in Tank X is greater than the number of moles or mass of nitrogen gas in Tank Y.

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Answer:

the newest strategy on get hurt a nuclear warhead we store any chemical agents is to actually dispose of them area of water lighten them off where there is no land animals or any other living breathing animals mammals plantations therefore the correct waste should be disposed of properly by either nuking it in like a loner thing when we burn bodies or in an isolated area where it cannot harm fellow American people animals tree life they should be disposed of properly properly by scientists that have corrected it and know how to break it down there for non giving harmful bacteria land my phone is going to die over Zone and taking away our atmosphere

Option 2) Bromoethane and methanol is correct

The major products obtained upon treatment of ethyl methyl ether with excess HBr are Bromoethane and methanol.

What is ethyl methyl ether?

Ethyl methyl ether is a colorless gas that is used as a solvent. The IUPAC name for this compound is methoxyethane. It is a member of the ether family of compounds. When ethyl methyl ether reacts with excess HBr, it undergoes a substitution reaction and forms Bromoethane and methanol. The mechanism for this reaction is given below: Methoxyethane reacts with hydrogen bromide to produce methanol and ethyl bromide (bromoethane). Here are the products that are formed in this reaction: Bromoethane (C2H5Br) and Methanol (CH3OH)

The chemical equation for this reaction can be written as: CH3OCH2CH3 + HBr → CH3OH + CH3CH2Br \(\boxed{Option\ 2)}\)

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Answer:

Using the VSEPR theory, the electron bond pairs and lone pairs on the center atom will help us predict the shape of a molecule. The shape of a molecule is determined by the location of the nuclei and its electrons. The electrons and the nuclei settle into positions that minimize repulsion and maximize attraction.

Explanation:

this from the internet

sorry if im wrong

The lone pairs and bond pairs in a molecule are used to determine the location of electron pair geometry around the molecule.

The geometry of a molecule refers to  the shape of the molecule. The geometry of a molecule is determined by the valence shell electron pair repulsion theory.

Now, we know that both lone pairs and bond pairs in the molecule are used to determine the electron domain geometry around the central atom as they take the most appropriate orientations in space to minimize electron pair repulsions.

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The mass of sodium hydroxide required is approximately 120 g.

To calculate the mass of sodium hydroxide (NaOH) required, we need to use the molar mass of NaOH and the number of moles needed.

The molar mass of NaOH is calculated as follows:

Molar mass of Na = 22.99 g/mol

Molar mass of O = 16.00 g/mol

Molar mass of H = 1.01 g/mol

Molar mass of NaOH = 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 39.99 g/mol

Now, we can calculate the mass of NaOH using the formula:

Mass = number of moles × molar mass

Number of moles = 3 moles

Mass of NaOH = 3 moles × 39.99 g/mol =119.97g

By performing this calculation, we find that the mass of sodium hydroxide required is approximately 120 g.

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             Where is the picture?                                                                         

Answer:

121.5g

Explanation:

from the equation:

2mol of Al react to give 3 mol of Zn

i.e 81g of Al will give 3×81/2 = 243/2 = 121.5g

Fatty acid A is linoleic acid (9,12-octadecadienoic). Fatty acid A is an omega-6 fatty acid. And the shorthand notation for fatty acid A is 18:2 Δ9,12

Fatty acid A is linoleic acid (9,12-octadecadienoic). Now, let's determine the omega designation for linoleic acid:

Since the first double bond is located at position 9 from the carboxyl end, linoleic acid is classified as an omega-6 fatty acid. The omega-6 designation indicates that the first double bond is 6 carbons away from the methyl end of the fatty acid chain.

The shorthand notation for linoleic acid is as follows:

18:2 Δ9,12

Let's break down the notation:

"18" represents the number of carbon atoms in the fatty acid chain.

"2" indicates the number of double bonds present in the fatty acid.

"Δ9,12" specifies the position of the double bonds in relation to the carboxyl end of the fatty acid chain. In this case, the double bonds are located at positions 9 and 12.

Therefore, the answers to your questions are as follows:

(i) Shorthand notation for fatty acid A (linoleic acid): 18:2 Δ9,12

(ii) Fatty acid A (linoleic acid) is an omega-6 fatty acid.

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Answer:

Atom Labeling

Explanation:

Y- neutron

Z-protron

X - electron

W- nucleus

According to the information, a flask with a volume of 9 liters would be required to hold the nitrogen gas at a pressure of 2.0 atmospheres.

This problem can be solved using Boyle's Law, which states that the product of pressure and volume is constant for a fixed amount of gas at a constant temperature.

So, we can use the formula P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.

We are given:

Plugging these values into the formula, we get:

Simplifying, we get:

Therefore, a flask with a volume of 9 liters would be required to hold the nitrogen gas at a pressure of 2.0 atmospheres.

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the answer for this question is Mister

The minimum amount of oxygen required for the complete combustion of 20cm³ of CO and 20cm³ of H₂ would be 20.16 cm³ at STP.

The balanced chemical equation for the combustion of CO and H2 is:

CO + 1/2O2 → CO2

H2 + 1/2O2 → H2O

From the equation, we can see that one mole of CO requires 1/2 mole of O2, while one mole of H2 requires 1/2 mole of O2.

From the balanced equation, we can see that each mole of CO requires 1/2 mole of O2, while each mole of H2 requires 1/2 mole of O2.

Therefore, we need 0.00083/2 = 0.00042 moles of O2 for the combustion of CO and the same amount for the combustion of H2.

The total amount of O2 required is the sum of the amounts needed for each reactant:

Therefore, the minimum amount of oxygen required for the complete combustion of 20 cm³ of CO and 20 cm³ of H2 is approximately 20.16 cm³ at STP.

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Answer:

convection

Explanation:

as air is heated, it rises up and away from the heat source, cools then falls closer to the heat source over and over again.

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The stratosphere is cold except in its upper regions where Ozone is located.

The potential temperature is 15°C.

Given,The temperature of some air is minus 20 degrees C at 95 kPa of pressure.

Reference pressure at sea level = 101.3 kPa

The potential temperature (θ) is the temperature a parcel of dry air would have if it were adiabatically brought to a standard reference pressure, typically 1000 millibars (100 kPa).

Potential temperature is directly proportional to the absolute temperature and inversely proportional to the pressure in a system.

In order to find the potential temperature of the given air, we can use the formula below:

θ = T × (P0 / P)^(R/cp)

where,θ = potential temperature (in Kelvin)

T = temperature (in Kelvin)

P0 = reference pressure (in Pa)

P = actual pressure (in Pa)

R = gas constant for dry air (287 J/(kg·K))

cp = specific heat of dry air at constant pressure (1004 J/(kg·K))

Converting the given temperature in Celsius to Kelvin:

T = -20°C + 273.15K= 253.15K

The formula can be written as:

θ = T × (P0 / P)^(R/cp)θ

= 253.15 × (101300/95000)^(287/1004)θ

= 288.5 K

Converting the potential temperature from Kelvin to Celsius:

θ = 288.5 K - 273.15

= 15.35°C (to the nearest degree)'

= 15°C (rounded off to the nearest degree).

Therefore, the potential temperature is 15°C.

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Answer:

A. Mixture

Explanation:

Answer:

384399861 meters

Explanation:

Answer:

C.

Explanation:

The sound is perceived as louder if the amplitude increases, and softer if the amplitude decreases. ... As the amplitude of the sound wave increases, the intensity of the sound increases. Sounds with higher intensities are perceived to be louder. Relative sound intensities are often given in units named decibels (dB).

The correct statement about the amplitude of a wave is option C. Thus, the larger the amplitude, the more the energy that is carried by the wave.

Amplitude of a wave is a parameter describing the intensity of the wave. Amplitude of a transverse wave and sinusoidal waves are measured as the distance between from the central point of a crest to its top or the the distance from the central point of the trough in the line to its bottom part.

The amplitude of a wave is directly proportional to the frequency of the wave and the frequency in turn is directly proportional to the energy of the wave.

Therefore, The correct statement about the amplitude of a wave is option C. Thus, the larger the amplitude, the more the energy that is carried by the wave.

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The reaction is no longer operating and no longer producing heat, which causes the temperature to drop. Additionally, the temperature of the reactant solution added after the stoichiometric point is achieved is lower than that of the reaction mixture.

What is Stoichiometric Point?

The titration's equivalence point is reached by adding just enough titrant to totally neutralize the analyte solution. The titrant's moles (a standard solution) are equivalent to the moles of the unknown-concentration solution. Because it is at this point that the quantity of acid needed to neutralise an identical amount of base is equal, it is often referred to as the stoichiometric point. Please take note that this does not imply that the acid to base ratio is 1:1. The equation for a balanced acid-base chemical reaction determines the ratio.

Actually at the equivalence point, the titrant and analytes have completely reacted, that's why temperature drop.

The equivalence point, or stoichiometric point, of a chemical reaction is the point at which chemically equivalent quantities of bases and acids have been mixed

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Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.98grams are present in  45.73 moles of  BCl\(_3\).

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.

Mathematically,

number of moles of  BCl\(_3\) =given mass of BCl\(_3\) ÷ molar mass of BCl\(_3\)

Molar mass of 1 mole of BCl\(_3\) = 46.264 g/mol

number of moles of  BCl\(_3\) = 45.73 moles

Substituting all the given values in the above equation, we get

45.73 moles =mass of BCl\(_3\)÷46.264 g/mol

mass of BCl\(_3\)   =0.98grams

Therefore, 0.98grams are present in  45.73 moles of  BCl\(_3\).

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The mass of ammonia that would be produced is 312.5 g

First, we will write a balanced chemical equation for the reaction

The balanced chemical equation for the reaction is

3H₂(g) + N₂(g) → 2NH₃(g)

This means

3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia.

First, we will determine the number of moles of each reactant present

For Hydrogen (H₂)

Mass = 83.6 g

Molar mass = 2.016 g/mol

Using the formula

\(Number\ of\ moles = \frac{Mass}{Molar\ mass}\)

Number of moles of H₂ present = \(\frac{83.6}{2.016}\)

∴ Number of moles of H₂ present = 41.468254 moles

For Nitrogen (N₂)

Mass = 257 grams

Molar mass = 28.0134 g/mol

∴ Number of moles of N₂ present = \(\frac{257}{28.0134}\)

Number of moles of N₂ present = 9.174181 moles

Since,

3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia

Then,

27.522543 moles of hydrogen gas will react with the 9.174181 moles of nitrogen gas to produce 18.348362 moles of ammonia

∴ 18.348362 moles of ammonia will be produced during the reaction

Now, for the mass of ammonia that would be produced

From the formula

Mass = Number of moles × Molar mass

Molar mass of ammonia = 17.031 g/mol

Mass of ammonia that would be produced = 18.348362 × 17.031

Mass of ammonia that would be produced = 312.49095 g

Mass of ammonia that would be produced ≅ 312.5 g

Hence, the mass of ammonia that would be produced is 312.5 g

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Answer:

A. Karl Landsteiner is the most likely for her to mention.

Answer: Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. The anode (positive electrode ) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode.

Answer:

196+32+16x4 = 292 g ans.

Explanation: