What is the common name for aspirin?

The number of moles of CH4 present in 2.45 × 10²³ molecules is 0.41 moles.

The number of moles of a substance can be calculated by dividing the number of molecules by Avogadro's number.

no. of moles = no of molecules ÷ 6.02 × 10²³

According to this question, 2.45×10²³ molecules of CH4 are given. The number of moles is calculated as follows:

no of moles = 2.45 × 10²³ ÷ 6.02 × 10²³

no of moles = 2.45/6.02

no of moles = 0.41moles

Therefore, the number of moles of CH4 present in 2.45 × 10²³ molecules is 0.41 moles.

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Answer:

Initial Speed ____4m/s. Final Speed ______6m/s. Time ______5 seconds . Acceleration =________0.4m/s²

Explanation:

The acceleration is the rate of change of velocity during time t .

acceleration = Final velocity- Initial velocity/ Time

                    = Vf- Vi/ t

            a = Δv/ Δt

                   = 6m/s- 4m/s/ 5s

                   = 2m/s/ 5s

                  = 0.4m/s²

It can also be defined as the difference of the initial and final velocity ( velocities measured in meters per second) during the given time t measured in seconds .The SI unit of acceleration is meter per second squared.

If the velocities are not measured in meters per second or time is not measured in seconds then the units are changed accordingly.

The molecule which would have the highest boiling point is 2-methylhexane. Thus, the correct option will be D.

The boiling point is the temperature at which the vapor pressure of a liquid is equal to the external pressure. The boiling point of a liquid is a measure of its vapor pressure. The higher the boiling point, the higher the vapor pressure of the liquid, and the more heat is required to vaporize it.

The boiling point of a substance is affected by the strength and types of intermolecular forces. The stronger the intermolecular forces, the higher the boiling point. 2-methylhexane has highest boiling point because it has the highest number of carbons and branches, which contribute to its strong intermolecular forces that lead to a higher boiling point.

Therefore, the correct option is D.

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Answer:

It is a method used to identify a suspect.

Explanation:

DNA fingerprinting is a method used to identify an individual from a sample of DNA by looking at unique patterns in their DNA.

The neutralization reactions can be completed and balanced as follows:

28. 2CsOH + H2CO3 → Cs2CO3 + 2H2O

29. 2HF + Mg(OH)2 → MgF2 + 2H2O

30. 3HNO3 + Al(OH)3 → Al(NO3)3 + 3H2O

31. H2O + FrF → FrOH + HF

32. H2O + LiBrO → LiOH + HBrO

28. The neutralization reaction between CsOH (cesium hydroxide) and H2CO3 (carbonic acid) results in the formation of Cs2CO3 (cesium carbonate) and 2H2O (water). The balanced equation is: 2CsOH + H2CO3 → Cs2CO3 + 2H2O.

29. The neutralization reaction between HF (hydrofluoric acid) and Mg(OH)2 (magnesium hydroxide) produces MgF2 (magnesium fluoride) and 2H2O (water). The balanced equation is: 2HF + Mg(OH)2 → MgF2 + 2H2O.

30. The neutralization reaction between HNO3 (nitric acid) and Al(OH)3 (aluminum hydroxide) yields Al(NO3)3 (aluminum nitrate) and 3H2O (water). The balanced equation is: 3HNO3 + Al(OH)3 → Al(NO3)3 + 3H2O.

31. The reaction between H2O (water) and FrF (francium fluoride) results in the formation of FrOH (francium hydroxide) and HF (hydrofluoric acid). The balanced equation is: H2O + FrF → FrOH + HF.

32. The neutralization reaction between H2O (water) and LiBrO (lithium hypobromite) forms LiOH (lithium hydroxide) and HBrO (hypobromous acid). The balanced equation is: H2O + LiBrO → LiOH + HBrO.

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Answer:

idk but i tryed

Explanation:

The simplest way to use the periodic table to identify an element is by looking for the element’s name or elemental symbol. The periodic table can be used to identify an element by looking for the element’s atomic number. The atomic number of an element is the number of protons found within the atoms of that element.

A gas that initially had a temperature of 422 K and was reduced to only 269 mL would now have an initial temperature of 563.19 K.

Volume at start: 359 mL

Volume completed: 269 mL

422 K is the final temperature.

Temperature at the start =?

Charle's Law can be used to resolve the issue. Charles Law states that with constant pressure and molecular number, the volume of a given amount of a gas is directly proportional to its temperature.

V₁/T₁ = V₂/T₂

Initial volume: V1

Initial temperature is T1.

Final volume is V2.

T2 = Actual temperature.

We will now enter the values into the formula.

V₁/T₁ = V₂/T₂

T₁ = V₁T₂ / V₂

T1 = 359 ml 269 ml / 422 K

T1=151498 ml.K/ 269 ml

T₁ = 563.19 K

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Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Answer:

Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume)

Explanation:

Answer:

A measure of how fast products are made in a reaction.

Explanation:

i just took the test and it gave me this cuz the other person was wrong

No luminaires shall be installed for operation on supply circuits over 150 volts between conductors. Luminaires mounted in walls shall be installed with the top of the luminaire lens not less than 450 mm (18 in.)

In an electrical installation, what is a luminaire?

A luminaire, also known as a light fixture, is a complete lighting assembly that includes one or more lamps (light bulbs or tubes), a socket and other protective elements, wiring that links the lamp to a power source, and a reflector to help direct and spread the light.

The construction, installation, or inclusion of shades or guards on luminaires is required to prevent the exposure of combustible materials to temperatures above 90°C (194°F). Unswitched lamp holders must be used above materials that are very flammable.

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When heated, the air in the balloon will expand, resulting in an increase in volume and a reduction in density. The air within the balloon will thus be lighter than the air outside. The balloon then rises higher as a result.

Charles discovered that a gas's volume and temperature are inversely correlated when working with balloons. This link between temperature and gas volume, which came to be known as Charles' law, explains how hot-air balloons function.

The outcome is an increase in gas volume in line with Charles' law. As the balloon expands, the air within gets less dense and lifts the balloon.

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hello sister the answer is very easy it is 2 miles of oxygen

the exact value of the expression \(\log _{10} 0.0001\) is -4.

The expression given is \(\log _{10} 0.0001\).
We know that \(\log _{10} 0.0001\) is the power to which 10 must be raised to get 0.0001.
We can write 0.0001 as 1/10,000 or in exponential form, 10^-4.
Therefore, \(\log _{10} 0.0001 = \log _{10} 10^{-4}\).
Using the property of logarithms, \(\log _{a}a^{b}=b\), we get
\(\log _{10} 10^{-4} = -4\).
So, the exact value of the expression \(\log _{10} 0.0001\) is -4.
the exact value of the given expression is -
Expression: \(\log _{10} 0.0001\)
Recall that the logarithm is the inverse of exponentiation. In this case, we want to find the exponent to which 10 must be raised to obtain 0.0001.
Since 0.0001 = 10^(-4), the expression simplifies as follows:
\(\log _{10} 0.0001 = \log _{10} 10^{-4}\)
By the property of logarithms, the exponent can be directly extracted when the base of the logarithm matches the base of the exponent:
\(\log _{10} 10^{-4} = -4\)
So the exact value of the expression is -4.

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So

No of moles=n

\(\\ \rm\rightarrowtail PV=nRT\)

\(\\ \rm\rightarrowtail n=\dfrac{PV}{RT}\)

\(\\ \rm\rightarrowtail n=\dfrac{814(3)}{25R}\)

\(\\ \rm\rightarrowtail n=2442/25R\)

\(\\ \rm\rightarrowtail n=97.7Rmol\)

Answer:

C

Explanation:

The solution that will reach dynamic equilibrium is a saturated solution. The correct option is C.

A chemical solution in which the solute concentration is less than its equilibrium solubility is known as an unsaturated solution.

The solvent dissolves the entire solute.

When a solute (typically a solid) is mixed with a solvent (commonly a liquid), two reactions take place at the same time.

Thus, the correct option is C, the saturated solution.

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The pH of the solution resulting from mixing 25.0 mL of 0.300 M NH₃ and 50.0 mL of 0.100 M HNO₃ is approximately 4.83.


To find the pH of the solution, we need to determine if the resulting solution is acidic, basic, or neutral. Given that NH₃  is a weak base and HNO₃ is a strong acid, the NH₃  will act as the base and the HNO₃  will act as the acid.

First, we need to calculate the number of moles of NH₃  and HNO₃  that are present in the solution.

For NH₃ :
moles of NH₃  = volume of NH3 (L) × concentration of NH3 (mol/L)
moles of NH₃  = 0.025 L × 0.300 mol/L
moles of NH₃  = 0.0075 mol

Next, we need to determine which species will be present in excess. Since NH₃  has a higher number of moles, it will be the limiting reagent.

The reaction between NH₃  and HNO₃  will result in the formation of NH4+ and NO3-. The NH4+ will determine the pH of the solution.

To calculate the concentration of NH4+ in the solution, we need to determine the concentration of  that reacted with HNO₃ . This can be done by subtracting the moles of  that reacted from the total moles .

moles of NH3 remaining = moles of NH3 initially - moles of NH3 reacted
moles of NH3 remaining = 0.0075 mol - 0.005 mol
moles of NH3 remaining = 0.0025 mol


Therefore, the pH of the solution resulting from mixing 25.0 mL of 0.300 M NH3 and 50.0 mL of 0.100 M HNO3 is approximately 4.83.

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Answer:the second largest one

Explanation:

both weels are pushing at it

Answer:

I believe it is C.

Explanation:

Everything else is true.

Electromagnetic waves do not need an medium to travel though.

Answer:

C

Explanation:

EM waves need a medium mechanical waves don't

The the mole fraction of ammonia in such a solution is 0.291.

What is aqueous solution?

Water that has one or more dissolved substances in it is called an aqueous solution. An aqueous solution can contain particles, gases, or other liquids that have been dissolved in it. A mixture must be steady in order to be a real solution.

What is mole fraction?

By dividing the total number of moles in the given mixture by the number of molecules of a certain component, the term "mole fraction" is used. The concentration of a solution is expressed in this fraction.

28 % w/w means 28 gms ammonia in 100 gms ammonia solution

so water = 100-28 = 72 gms

moles of NH3 = 28/17 = 1.647

moles of water = 72/18 = 4

totals moles = 4+1.647 = 5.647

mole fraction of ammonia = moles of NH3/ total moles

= 1.647 /5.647 = 0.291

Therefore, the mole fraction of ammonia in such a solution is 0.291.

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The energy storage molecule that is produced when food is broken down during the cellular respiration process is ATP molecule.

The Cellular respiration is a metabolic pathway that generally breaks down glucose molecules and produces ATP. The stages of cellular respiration basically includes glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation etc.

Cell respiration usually consists of three steps that is glycolysis, the Krebs cycle, and the respiratory electron transport. The first step by which cells make the ATP from food is called glycolysis. For example Imagine eating a donut. The starches and sugars of the donut are generally converted to glucose that is blood sugar, in your mouth and stomach by digestive the enzymes.

During the cellular respiration, glucose is usually broken down in the presence of oxygen in order to produce carbon dioxide and water. Energy released during the reaction is usually  captured by the energy-carrying molecule ATP (adenosine triphosphate).

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If we look into the Bohr's atomic model, it is like a staircase.

Where every next orbit is like a stair.

As we can not rest in air, we either have to stay on level 1 or can go up with enough energy to climb next level.

Same way, electron can either stay on one orbit or can go to higher orbits with enough energy to jump from lower energy level to the higher energy level, can say orbit.

According to Bohr, atom is a system consisting of a dense nucleus surrounded by orbiting electrons.

He  compared his atomic structure with the structure of the Solar System.

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Answer:

12ml per hour and

69% LOL

1) The rate of percolation would be 0.33 ml/s

Percolation rate = volume of water/time

                             =  600/1800s

                              = 0.33 ml/s

2) The percentage of water absorbed would be 40%

Percentage of water absorbed = amount absorbed/total water x 100

                 amount of water absorbed = 100 - 60

                                                      = 40 ml

                  total amount of water = 100 ml

   Percentage of water absorbed = 40/100 x 100

                                                       = 40%

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Answer:

I did not understand the question

Communication skills were developed so knowledge could be passed along to younger generations.

Knowledge will pass from one generation to another with the help of education. The skill people give education to their youngers about fire and tools. In this way, skills of fire and tools pass from one generation to another.

So we can conclude that communication skills were developed so knowledge could be passed along to younger generations.

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Answer:

A

Explanation:

People leaving a classroom and going to different classrooms: This is a process of diffusion, where particles move from an area of high concentration to an area of low concentration. The sign for this process is negative because it results in a decrease in the concentration of particles in the initial area.

Stacking sheets of paper: This is a process of increasing order or organization, and it does not involve any significant change in energy. Therefore, the sign for this process is neither positive nor negative.

Dissolving salt in water: This is a process of dissolution, where salt crystals break down into individual ions and become surrounded by water molecules. This process involves the transfer of energy between the system and the surroundings. The sign for this process is negative because it releases energy to the surroundings.

Burning sugar: This is a process of combustion, where the sugar molecules react with oxygen in the air to produce carbon dioxide and water, releasing a large amount of energy. The sign for this process is highly positive because it involves a significant increase in energy as the bonds in the sugar molecules are broken and new bonds are formed.

Moving a pencil from one side of a desk to another: This is a process of physical movement that does not involve any significant change in energy. Therefore, the sign for this process is neither positive nor negative.

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Answer:

4.95

Explanation:

1.00 M H2A

1.38 m NaOH

Titration = 200.0 mL

Calculate moles of NaOH

= \(\frac{100*1.38}{300}\)  = 0.46

calculate moles of H2A

= \(\frac{200 * 1.0}{300}\) = 0.667

therefore the moles of acid left = moles of H2A - moles of NaOH

                                                    = 0.667 - 0.46 = 0.207

pka = - log( ka )

       = - log ( 2.5 * 10^-5 ) = 4.61

calculate PH after 100 ml of 1.38 M NaOH have been added

PH = pka + log \((\frac{salt}{acid} )\)

     = 4.61 + log \((\frac{0.46}{0.207} )\) = 4.95

Answer:

C. A chemical reaction.

Explanation:

A chemical reaction can be defined as a chemical process which typically involves the transformation or rearrangement of the atomic, ionic or molecular structure of an element through the breakdown and formation of chemical bonds to produce a new compound or substance.

Since the Statue of Liberty is made out of copper and was once shiny and copper-colored. Over the years, the copper has gone through a process called oxidation, where it has changed into a new material. Thus, this is a chemical reaction.

In this case, occurred a CHEMICAL REACTION known as oxidation.

A chemical reaction is a process where one or more substances called reactants can react to be converted into one or more products.

In conclusion, in this case, occurred a CHEMICAL REACTION known as oxidation.

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Answer:

Hydrogen (H) “burning” initiates the fusion energy source of stars and leads to the formation of helium (He).

FUSION Reaction

Explanation:

mark me brainliest please.

Glycine is the only amino acid that is not optically active because it does not have a carbon chiral center.

The simplest amino acid is glycine. Because it is the only amino acid without an asymmetrical carbon atom, it differs from all the other amino acids. Glycine is therefore optically inactive. No stereoisomers exist in it. This amino acid is necessary for the manufacture of bile acids, porphyrins, creatine phosphate, and other amino acids as well as nucleic acids.

When compared to the other amino acids, glycine is integrated into proteins and enzymes at a rate of 7.5%, making it the second most prevalent amino acid on a molar basis. Glycine shares a similar ability to block neurotransmitter impulses in the central nervous system with gamma-aminobutyric acid and glutamic acid.

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Answer:

A and D

Explanation:

Answer:

A & D

Explanation: