Consider 2-butanone. Where would you expect to see the resonance for carbon 4 in a DEPT-45 spectrum? 7.8 ppm 29.4 ppm 8ppm none of these

Answer: By mass, about 96 percent of our bodies are made of four key elements: oxygen (65 percent), carbon (18.5 percent), hydrogen (9.5 percent) and nitrogen (3.3 percent). These elements do not give color to fireworks, but they are found in our body’s most abundant and important molecules, including water, proteins and DNA. The answer is B.

Explanation: I hope this helps. I got it from search.

Given :

Number of He atoms, \(n = 3.4\times 10^{24}\) atoms.

To Find :

How many grams are their in given number of He atoms.

Solution :

We know, molecular mass of He is 4 g. It means that their are \(6.022 \times 10^{23}\) atoms in 4 g of He.

Let, number of gram He in \(3.4\times 10^{24}\) atoms is x , so :

\(x = \dfrac{3.4\times 10^{24}}{6.022\times 10^{23}}\times 4\\\\x = $$22.58\ g\)

Therefore, grams of He atoms is 22.58 g .

The answer to the question is "e) all molecules will have the same speed." This is because all molecules, regardless of what elements they are made up of, have the same kinetic energy, so they will be moving at the same speed.

To better understand this concept, it is important to note that kinetic energy is the energy of an object due to its motion. Kinetic energy is determined by the mass and speed of the object, with the equation being KE = 1/2 x m x v^2 (where m is the mass and v is the velocity). So, if two objects have the same kinetic energy, they must have the same velocity, regardless of their mass.

As all molecules of hydrogen, nitrogen, oxygen and chlorine have the same kinetic energy, they must also have the same velocity, meaning that all molecules will be moving at the same speed. This is because the molecules' masses differ, but as the kinetic energy is the same, the velocity must be the same as well.

It is also important to note that kinetic energy is not the same as momentum. Momentum is determined by the mass and velocity of an object, but is not dependent on the kinetic energy of the object. So, while all molecules of hydrogen, nitrogen, oxygen and chlorine have the same kinetic energy, they may still have different momentum, due to their different masses.

In conclusion, all molecules of hydrogen, nitrogen, oxygen and chlorine will have the same speed, as they all have the same kinetic energy.

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Millikan's "oil drop" apparatus allowed for the determination of the charge of the electron, not its mass. So, the correct answer is (D) none of these.

By carefully observing the motion of oil droplets in an electric field, Millikan was able to measure the magnitude of the charge carried by each droplet. This experiment provided valuable insight into the discrete nature of electric charge and led to the determination of the elementary charge.

With the knowledge of the charge-to-mass ratio of the electron, subsequent experiments, such as the Thomson experiment, were able to determine the mass of the electron.

Therefore, while Millikan's apparatus played a crucial role in understanding the charge properties of the electron, it did not directly determine its mass.

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Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

The gravity force on an object from the Earth is the same regardless of whether the object is surrounded by air .

the Earth has an average gravitational force. Different locations on Earth have gravitational forces that are larger or smaller than average. This is because each location has more or less mass than the average

Answer:

it have been already balanced

2H2 + O2 = 2H2O.

Dispersion types include chromatic, material, waveguide, and polarisation mode dispersion.

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Given the various data from the question, the answers to each question is given below:

Avogadro's hypothesis

1 mole of K₂CrO₄ = 6.02×10²³ molecules

Therefore,

0.6 mole of K₂CrO₄ = 0.6 × 6.02×10²³

0.6 mole of K₂CrO₄ = 3.612×10²³ molecules

1 mole of K₂CrO₄ contains 2 moles of K.

Therefore,

0.6 mole of K₂CrO₄ will contain = 0.6 × 2 = 1.2 mole of K

From Avogadro's hypothesis,

1 mole of K = 6.02×10²³ atoms

Therefore,

1.2 mole of K = 1.2 × 6.02×10²³

1.2 mole of K = 7.224×10²³ atoms

Therefore, we can say that

0.6 mole of K₂CrO₄ = 7.224×10²³ atoms of K

Molarity is defined as:

Molarity = mole / Volume

From the question given above, we obtained the following:

Molarity = mole / Volume

Molarity = 0.5 / 2

Molarity = 0.25 M

From the question given above, the following data were obtained:

Percentage = (mass of solute / mass of solution) × 100

Percentage of sugar = (50 / 250) × 100

Percentage of sugar = 20%

Total volume = 2 L

Percentage of vinegar = 5%

Volume of vinegar =?

Volume = percent × total volume

Volume of vinegar = 5% × 2

Volume of vinegar = 0.1 L

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The stronger the acid the weaker the conjugate base  is the correct statement is a) True.

The Strong acids have a weak conjugate base. The example of this is as follows :

The HCl is the  strong acid. If HCl is a strong acid, means it will donate hydrogen ions . The HCl will be a  good proton donor, only if the Cl⁻ ion will be a poor proton acceptor. That means the Cl⁻ ion will be a weak base. The chemical equation is as follows :

HCl        +      H₂O        ⇄         H₃O⁺     +         Cl⁻

strong        strong                  weak                weak

acid             base                 conjugate          conjugate

                                                  acid                 base

This question is incomplete, the complete question is :

The stronger the acid the weaker the conjugate base, this statement is :

a) True

b) False  

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Answer:

Chlorination

Explanation:

"Exposure to high volumes of chlorine gas fumes can cause serious health problems, including death."

https://water.mecc.edu/courses/ENV211/lesson14_print.htm

:)

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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In a(n) aldose the carbonyl group is at the end of the carbon chain, but in a(n)ketose the carbonyl group can be at any other position.

A simple sugar called an aldose is a monosaccharide with a carbon backbone chain, an aldehyde group on the last carbon atom, and hydroxyl groups attached to every other carbon atom. Aldoses can be separated from ketoses, which are considered ketones because the carbonyl group is located distant from the end of the molecule.

Plants are the main source of aldoses. Ribulose, fructose, and other sugars are types of ketose. Aldose and ketose can be distinguished using Seliwanoff's Test. When this test is carried out, the aldose turns light pink whereas the ketose turns rich cherry red.

Therefore, In a(n) aldose the carbonyl group is at the end of the carbon chain, but in a(n)ketose the carbonyl group can be at any other position.

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Answer:

The molecules gain kinetic energy, more farther apart, and become a gas.

Explanation:

Answer:

Explanation:

Continued heating of liquid water causes the molecules to vibrate even faster, steadily raising the temperature,    Freezing  When liquid water freezes, it releases thermal energy and turns into the solid-state, ice.

The heat changes are as follows:

A phase change is a process whereby matter changes from one physical state to another when heat is added or removed.

The processes of change of state are as follows:

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Answer:

1.213 g/mol

Explanation:

We are given that the molecular mass is 7.304 × 10²³ g.

From avogadro's number, we know that;

1 mole of a substance = 6.022 × 10²³ molecules

Thus;

Molar mass = molecular mass/avogadro's number = (7.304 × 10²³)/(6.022 × 10²³) = 1.213 g/mol

Explanation:

D. The total mass of the reactants equals the total mass of the

products.

The mass of 4.5 moles of CO2  is 7.48x10-11 g CO2  Option b)

The ratio between the mass and the quantity of material (measured in moles) of any sample of a chemical compound is known as the molar mass (M) in chemistry.  The molar mass of a material is a bulk characteristic rather than a molecular one. The compound's molar mass is an average over many samples, which frequently have different masses because of elements.

A terrestrial average and a result of the relative frequency of the isotopes of the component elements on Earth, the molar mass is most frequently calculated from the standard atomic weights. For changing between a substance's mass and quantity in bulk amounts, the molar mass is the proper unit.

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Answer:

it will move

Explanation:

Choose the products that complete the reaction. The chemical equation may not be balanced.

NaHCO3 + HC2H3O2

Answer: NaC2H3O2 + CO2 + H2O

Answer:

Explanation:

A is the correct answer.

If you found my answer useful then please mark me brainliest

Answer:

I put this so the guy up top can have brainliest

Explanation:

your welcome

Answer:

Kₑq = [H₂]² [O₂] / [H₂O]²

Explanation:

We'll begin by defining equilibrium constant for a reaction. This is given below:

The equilibrium constant for a given reaction is defined as the ratio of the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient.

With the above information in mind, we shall determine the equilibrium constant for the reaction given in the question above. This is illustrated below:

2H₂O (g) <=> 2H₂ (g) + O₂ (g)

Kₑq = [H₂]² [O₂] / [H₂O]²

In this case, the system gained 77.5 kJ of heat and did 63.5 kJ of work on the surroundings, resulting in a net increase in internal energy of 14 kJ.

To calculate the internal energy change (ΔU) of a system and determine if the process is endothermic or exothermic, we can use the first law of thermodynamics equation: ΔU = Q - W, where ΔU is the change in internal energy, Q is the heat absorbed or released by the system, and W is the work done by or on the system.

In this case, the system absorbs 77.5 kJ of heat (Q) and does 63.5 kJ of work (W) on the surroundings. So we can plug these values into the equation:

ΔU = Q - W
ΔU = 77.5 kJ - 63.5 kJ
ΔU = 14 kJ

The change in internal energy (ΔU) is positive, meaning that the internal energy of the system has increased. Since the system absorbed heat (positive Q) and the overall internal energy increased, the process is endothermic. In an endothermic process, the system gains energy from the surroundings, typically in the form of heat.

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a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Answer:

6Fe^2+(aq) -------> 6Fe^3+(aq) + 6e

Explanation:

The balanced oxidation half equation is;

6Fe^2+(aq) -------> 6Fe^3+(aq) + 6e

A redox reaction is actually an acronym for oxidation-reducation reaction. Since the both reactions are complementary, there can't be oxidation without reduction and there can't be reduction without oxidation.

The main characteristic of redox reactions is that electrons are transferred in the process. The number of electrons transferred is usually deduced from the balanced reaction equation. For this reaction, the balanced overall reaction equation is;

Cr2O7^2–(aq) + 6Fe^2+(aq) +14H^+(aq)→ 2Cr^3+(aq) + 6Fe^3+ (aq) + 7H2O(l)

It is clear from the equation above that six electrons were transferred. Thus six Fe^2+ ions lost one electron each in the oxidation half equation as shown in the balanced oxidation half equation above.

Answer:

5.81×10²² molecules of oxygen.

Explanation:

This a reaction of decomposition:

2KClO₃ →  2KCl + 3O₂

2 moles of potassium chlorate can produce 2 moles of potassium chloride and 3 moles of oxygen.

We determine the amount of salt.

7.89 g. 1mol /122.55g = 0.0644 moles.

If 2 moles of salt, can produce 3 moles of oxygen.

0.0644 moles of salt may produce (0.0644 . 3) /2 = 0.0966 moles.

Let's count the molecules.

1 mol oxygen contains 6.02×10²³ molecules

Then, 0.0966 moles may contain (0.0966 . NA) = 5.81×10²² molecules

Chemical change: A chemical reaction is the change of one chemical substance into another chemical substance. For instance: The rusting of iron, the curdling of milk, the digestion of food, breathing, etc.

What is a chemical reaction?

A chemical reaction is the change of one chemical substance into another chemical substance.

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Chemical  change is the change  chemical substance is transformed into another chemical substance.It is irreversible in  nature , for example Reaction of medicine in body , milk to curd etc.

1)Physical change temporary or reversible in nature but chemical change is irreversible in nature

2)In physical change there no new product is formed but in chemical change there formation of new product takes .

3) Physical change is change sin shape ,size or state for example freezing of water , melting of wax , and example of  Chemical change are Burning of  coal, digestion of food

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The reaction of (R)-1-bromo-4-methylhexane with sodium cyanide (NaCN) in the presence of a polar aprotic solvent such as DMSO or DMF is a nucleophilic substitution reaction, known as a S**N2 reaction.

The nucleophile (CN-) attacks the carbon atom bearing the leaving group (Br-) from the backside, leading to inversion of stereochemistry at the stereocenter. The reaction can be represented as follows:

(R)-1-bromo-4-methylhexane + NaCN → (S)-4-methylhexanenitrile + NaBr

The major product formed is (S)-4-methylhexanenitrile, where the nitrile functional group (-CN) has replaced the bromine atom.

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4-methylpentane

The response of 4-methyl-2-pentyne with extra hydrogen in the presence of a platinum catalyst is a hydrogenation reaction, which entails the addition of hydrogen atoms across the triple bond of the alkyne. The expected foremost organic product is 4-methylpentane, which is formed through the complete discount of the triple bond to a single bond.

The hydrogenation of 4-methyl-2-pentyne proceeds through a stepwise addition of hydrogen atoms to the triple bond, forming an intermediate alkene and then a saturated alkane. However, the presence of extra hydrogen ensures that the alkene intermediate is quickly decreased to the alkane product, which is the extra thermodynamically secure form.

Therefore, the anticipated main organic product of the hydrogenation reaction of 4-methyl-2-pentyne with extra hydrogen in the presence of a platinum catalyst is 4-methylpentane

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