1. Which two formulas contain 4 atoms of hydrogen?

A. 2 H,CO3

B. H,02

C. C,H6

D. C,H,O2

ANSWER

The initial volume of the acid is 260mL

EXPLANATION

Given that;

The final volume of the ethanoic acid is 4.5L

The final concentration of the ethanoic acid is 1.0 mol/L

The initial concentration of the ethanoic acid is 17.4 mol/L

Follow the steps below to find the volume of the ethanoic acid

Step 1; Apply the dilution formula

Step 2; Substitute the given data into the formula

Therefore, the initial volume of the acid is 260mL

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question we have

\(volume = \frac{250}{0.001331} \\ = 187828.70025...\)

We have the final answer as

Hope this helps you

Answer:

Radioactive half-life refers to the amount of time it takes for half of the parent isotopes in a radioactive substance to decay into their respective daughter isotopes. The parent isotope is the original, unstable radioactive isotope that undergoes radioactive decay, while the daughter isotope is the resulting isotope after the decay process. During each half-life, the amount of parent isotope decreases by half, while the amount of daughter isotope increases correspondingly. This process continues in subsequent half-lives until all of the parent isotopes have decayed into their daughter isotopes.

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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Apparent weight = 639 N + (65.14 kg x 2.9 m/s²) = 835 N [2].When the elevator has an upward acceleration of magnitude 2.90 m/s², the reading on the scale will be different from the person's normal weight due to the apparent weight caused by the elevator's acceleration .

The apparent weight is the force experienced by the person inside the elevator, and it is related to the actual weight and the acceleration of the elevator.To calculate the apparent weight of a person in an elevator, we can use the formula:

apparent weight = actual weight + (mass of the person x acceleration of the elevator)

where the mass of the person is equal to the actual weight divided by the acceleration due to gravity, which is 9.81 m/s².

For example, if a person's normal weight is 639 N (about 65.14 kg) and the elevator has an upward acceleration of 2.9 m/s², the apparent weight will be:

apparent weight = 639 N + (65.14 kg x 2.9 m/s²) = 835 N [2]

Similarly, if a person's normal weight is 655 N and the elevator has an upward acceleration of 2.9 m/s², the scale reading will be different from their normal weight, and the apparent weight can be calculated using the above formula

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Answer:

They are produced by the hottest and most energetic objects in the universe, such as neutron stars and pulsars, supernova explosions, and regions around black holes. On Earth, gamma waves are generated by nuclear explosions, lightning, and the less dramatic activity of radioactive decay.

I hope this helped!!

The wavelength of an infrared photon that has a frequency of 2.13 x 10⁹

Hz is 0.14 m.

What is infrared radiation?

          c = ν λ

where

 c = speed of light ⇒ 3×10⁸ m/s

 ν = frequency ( Hz or s⁻¹ ) ⇒ 2.13 x 10⁹ Hz

 λ = wavelength ( m ) ⇒ ?

    substituting the values

    c = ν λ

   λ = c / ν

      = (3×10⁸ m/s) / 2.13  x 10⁹

      = 1.4 x 10⁻¹ m or 0.14 m

Thus we can conclude that the wavelength of an infrared photon that has a frequency of 2.13 x 10⁹Hz is  0.14 m.

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The collision theory explains this outcome since when the reaction is complete reactant particles can not interact and therefore the reaction does not occur.

The collision theory is a well sustained theory used in chemistry that states reactions are caused by the collision of particles that form their molecules.

This theory (collision theory) may result very useful to explain the rate of change in a given chemical reaction.

In conclusion, the collision theory explains this outcome since when the reaction is complete reactant particles can not interact and therefore the reaction does not occur.

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All of the carbon-carbon bonds in benzene (C₆H₆) are equal to one and one-half bonds and have a bond length in between that of a single bond and a double bond with all of the bond angles at approximately 120°

This is due to the delocalization of pi (π) electrons in the benzene ring, creating a resonance structure. In the resonance structure, the π electrons are spread out over the entire ring, resulting in a more stable system.

The bond angles in benzene are all approximately 120 °. This is because the carbon atoms in the benzene ring are arranged in a hexagonal shape, forming a regular polygon. In a regular hexagon, each internal angle is 120 °. Therefore, all of the bond angles in benzene are approximately 120 °, resulting in a planar molecular structure.

The unique bonding pattern and bond angles in benzene contribute to its stability and aromaticity, making it a fundamental compound in organic chemistry.

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Answer:

When dry ice (solid carbon dioxide) is exposed to room temperature, it sublimates, meaning it changes directly from a solid to a gas. This process is known as sublimation and is why dry ice "disappears" when left at room temperature. As the dry ice sublimates, it releases carbon dioxide gas into the air.

Answer:

Answer is C.

Explanation:

I hope it's helpful!

Answer:

Reaction 2

Explanation:

12/30=0.4g/sec

200/(8*60)=0.41667g/sec

Answer:

d. Methanol is more acidic than the alkyne and will be deprotonated instead.

Explanation:

because acidity is the ability to lose H+, leaving an anion behind; acidity depends on the stability of the anion.

The incorrect interpretation of the given balanced equation is option a.

2g s + 3g O2 →2 g SO3.

The coefficient of the reacting species and products are not showing the amount in grams.

In the balanced chemical equation of a reaction, all the reactants and products are written in their perfect stoichiometry. The number of each elements in the reactant side must be equal to their number in  product side. So that the law of conservation of mass is obeyed.

The coefficients of the reactants and products can be balanced to equate the number of each elements in both side. The coefficients represent the number of moles of the reactants and products. Sometimes they are considered to be the number of reacting atoms of each elements.

In the given reaction, 2 moles of S reacts with 3 moles of oxygen gas giving 2 moles of sulphur trioxide. Here, the amount in grams are not given. Therefore, option a is incorrect.

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Your question is incomplete. But your complete question is attached below:

Heat of vaporization is the amount of heat energy required to convert a substance from its liquid state to its gaseous state at a constant temperature and pressure. It is a measure of the strength of the intermolecular forces holding the molecules together in the liquid phase.

Heat of vaporization:

Heat of vaporization is the amount of heat energy required to convert a substance from its liquid state to its gaseous state at a constant temperature and pressure. It is a measure of the strength of the intermolecular forces holding the molecules together in the liquid phase.

When a substance is heated, the added energy increases the kinetic energy of the molecules, causing them to move faster. As the temperature rises, the average kinetic energy of the molecules increases, and eventually, the molecules have enough energy to overcome the intermolecular forces and escape from the liquid phase, forming a gas.

The heat of vaporization is specific to each substance and is typically expressed in units of joules per gram (J/g) or calories per gram (cal/g). It is an important property in various applications, such as in the design of cooling systems, understanding phase changes, and calculating energy requirements for processes involving vaporization.

Fact:

The heat of vaporization for water is approximately 40.7 kilojoules per mole (kJ/mol) at its boiling point of 100 degrees Celsius.

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The heat of vaporization is the amount of heat required to convert one gram of a substance from its liquid state to its gaseous state without any change in temperature. It is denoted by delta Hvap.

This is a measure of the energy that is required to overcome the intermolecular forces that hold a liquid together and break the bonds between the molecules to form a gas.Heat of vaporization is the amount of heat required to convert one gram of a substance from its liquid state to its gaseous state without any change in temperature.

There are many interesting phenomena where the heat of vaporisation can be seen. For instance, heat is continuously added to liquid water when it boils on a hob in order to overcome the intermolecular interactions and turn it into water vapour. Similar to how sweat evaporates from our skin, the heat that is removed from us as the sweat changes from a liquid to a gas cools us down.

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Answer:

The mass of an atom is equal to the protons plus the neutrons

Answer:

Find the area of each face that you see and then multiply each area by two to account for the face on the opposite side.

Answer:

The answer is 2.

Explanation:

Answer:

1.2mol

Explanation:

Determine the g/mol of CO2

O - 16g/mol (based on my data booklet)

C - 12.01g/mol (based on my data booklet)

Then add these values up for the g/mol of CO2

16+16+12.01= 44.01g/mol

Then write out the formula

mol = mass/molar mass

n= m/M

n = 55/44.01

n= 1.24971597

and depending on what significant digits you need (based on info, ill do it to 2 terms)

n = 1.2 mol

Molar mass is defined as the mass in grams of one mole of a substance. 1.2 molecules of CO2 are there in 55 grams of CO2.

The term molar mass is defined as the mass of a chemical compound divided by its amount-of-substance measured in moles. It is represented by the symbol "M". The units of molar mass are grams per mole, abbreviated as g/mol.

The weight of one mole of a sample is defined as its molar mass. To calculate a molecule's molecular mass, multiply the subscript by the atomic mass of each element in the molecule, then add the masses of all the elements in the molecule.

Molar mass of Oxygen - 16g/mol

Molar mass of Carbon - 12.01g/mol

Then add these values up for the g/mol of CO₂

Molar mass of CO₂ = 16+16+12.01

= 44.01g/mol

Then,

The number of mole = mass / molar mass

n = m / M

n = 55 / 44.01

n = 1.24971597

n = 1.2 mole

Thus, 1.2 molecules of CO2 are there in 55 grams of CO2.

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If an oxygen sample's pressure is 28.5 mm hg, its pressure in millimeters of mineral oil is 473.22 mm.

Mineral oil is a virtually tasteless, colorless, oily, and water-insoluble liquid. It can be found in lubricating laxatives, carrier oils, and cosmetics. It can be used to moisturize skin, treat dandruff, cradle cap, cracked feet, mild eczema, and other skin conditions, remove earwax, relieve constipation, and moisturize skin.

A manometer is a pressure-measuring tool. An ordinary simple manometer is made of a U-shaped glass tube that is partially filled with liquid.

In manometers, the pressure can be expressed as:

Pressure = gravity  ×height × density

In this case, we know the height and density of mercury; and we're asked to calculate the height of oil:

Gravity × h of oil × d of oil = Gravity × h of Hg × d of Hg

h of oil × d of oil = h of Hg × d of Hg

h of oil × 0.88 g/mL = 28.5 mm Hg × 13.5 g/mL

h of oil = 437.22 mm oil

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Answer:

Increase in temperature will not affect a solid - liquid mixture. Example can be taken of salt and water

Answer:

the nucleus.

Explanation:

Because there is all the protons and neutrons are in the nucleus.

Answer:

\(2H_2O\rightarrow 2H_2+O_2\)

Explanation:

Hello there!

In this case, for the reaction by which water is decomposed to molecular hydrogen and oxygen:

\(H_2O\rightarrow H_2+O_2\)

It is necessary to perform the inspection balance process since there is a dissimilar number of atoms of oxygen on both sides; therefore, by putting a 2 on water we balance oxygen:

\(2H_2O\rightarrow H_2+O_2\)

But now, there are four hydrogens on the left; therefore, we put a 2 on hydrogen to finally balance it:

\(2H_2O\rightarrow 2H_2+O_2\)

And obviously, the coefficient in oxygen is an unwritten 1.

Best regards!

Answer:

The number of atoms or ions in a compound are shown as subscripts in the chemical formula.

If a compound's ions have a different value, then the chemical formula should have subscripts.

Hope it helps <3

Explanation:

Complete question :

A jeweler has five rings, each weighing 18 g, made of an alloy of 10% silver and 90% gold. She decides to melt down the rings and add enough silver to reduce the gold content to 75%. How much silver should she add?

Answer:

Kindly check explanation

Explanation:

Given the following :

Weight of each alloy = 18g

Initial % of Silver = 10% = 0.1

Initial % of Gold = 90% = 0.9

New % of gold = 75% = 0.75

Hence, new % of silver will be (1 - 0.75) = 0.25

Let the amount of silver to be added = s

Hence,

Initial gold content = final gold content + added silver

18 * 0.9 = 0.75(18 + s)

16.2 = 13.5 + 0.75s

16. 2 = 13.5 + 0.75s

16.2 - 13.5 = 0.75s

2.7 = 0.75s

s = 2.7 / 0.75

s = 3.6

S = 3.6

Hence the amount of silver needed per ring in other to reduce the gold content = 3.6g

Total for the 5 rings = (3.6 * 5) = 18g

Based on the vital signs provided, the nurse should hold Digoxin when caring for the client on the cardiac unit.

Digoxin is a medication commonly prescribed to treat heart conditions, such as atrial fibrillation and heart failure. However, it can cause adverse effects on the heart and other organs if the dose is not carefully monitored, especially if the client's vital signs are not within a certain range. In this case, the client's blood pressure is lower than the normal range, which can indicate hypotension. Digoxin can further lower blood pressure and cause adverse cardiac effects in clients with low blood pressure. Therefore, the nurse should hold the medication and contact the healthcare provider to adjust the dosage or withhold the medication until the client's blood pressure stabilizes.

It is crucial for nurses to monitor their client's vital signs before administering medications, especially for clients on the cardiac unit. Vital signs, such as blood pressure, heart rate, and temperature, provide valuable information about the client's health status and can help identify potential adverse effects of medication. In this scenario, the nurse correctly identified that the client's low blood pressure warrants holding Digoxin. By doing so, the nurse can prevent adverse events and promote the client's safety and well-being.

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