Some of the important pollutants in the atmosphere are ozone (O3), sulfur dioxide, and sulfur trioxide. Write Lewis structures for these three molecules. Show all resonance structures where applicable.

Answer:

A

Explanation:

A catalyst speeds up a reaction by lowering the required activation energy, so it's not B. Like previously stated, the catalyst lowers the activation energy required, so it's not C either. This leaves us with A. Just to double check, does a catalyst speeds up a reaction? Yes! So like it says in A, a catalyst causes the equilibrium to be reached faster. Have a nice day! :)

Catalysts speed up a chemical reaction by causing equilibrium to reach quickly while maintaining the equilibrium's position. Thus, option A is true.

A catalyst increases the reaction rate by decreasing the activation energy of the reaction. As the minimum energy required by the reactants for the reaction is decreased the rate of the formation of products increases.

During the reaction, the catalyst remains unchanged and does not undergo any chemical change. It can increase the reaction rate of both irreversible and reversible reactions.

In an equilibrium reaction, the catalyst can increase the rate of both forward and reverse reaction by reaching the reaction equilibrium at a faster rate and can move the reaction toward the products as well as a reactant.

Therefore, the catalyst causes equilibrium to be reached faster.

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When meta-bromoaniline is treated with NaNO₂ and HCl, it produces a diazonium salt. When that diazonium salt is further treated with different reagents, we can obtain different products.

These products are:

a) When the diazonium salt is treated with water (H₂O), the product obtained is phenol. This reaction is known as hydrolysis and it occurs due to the replacement of the diazonium group by a hydroxyl group (-OH) from water.

b) When the diazonium salt is treated with hydrofluoric acid (HBF₄), the product obtained is an arenediazonium tetrafluoroborate salt. This is because, in the presence of HBF₄, the diazonium group  gets replaced by a tetrafluoroborate anion (BF₄⁻).

c) When the diazonium salt is treated with copper cyanide (CuCN), the product obtained is a copper-cyanide complex. This reaction is known as Sandmeyer's reaction, and it is used to replace the diazonium group with a cyanide anion (-CN) to form an aryl cyanide.

d) When the diazonium salt is treated with copper bromide (CuBr), the product obtained is an aryl bromide. This reaction is also known as the Gatterman reaction, and it is used to replace the diazonium group with a bromine atom (-Br) to form an aryl bromide.

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The complete question-

Give the products obtained when meta-bromoaniline is treated with NaNO₂ and HCl.

Therefore, the condensed electron configuration for platinum (Pt) is:

[ Xe ] 4f¹⁴5d⁹6s¹

The element with the chemical symbol Pt represents platinum (Pt). To write the condensed electron configuration for platinum, we can use the noble gas shorthand notation.

The atomic number of platinum is 78, indicating that it has 78 electrons.

The noble gas that precedes platinum in the periodic table is xenon (Xe), which has an electron configuration of [Xe] 5s²4d¹⁰5p⁶.

To write the condensed electron configuration for platinum, we start with the noble gas symbol in brackets and then continue with the remaining electron configuration.

Therefore, the condensed electron configuration for platinum (Pt) is:

[ Xe ] 4f¹⁴5d⁹6s¹

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Molality of a solution is defined as the number of moles of solute per kilogram of solvent. The formula for molality is given by the following equation:molality (m) = moles of solute / mass of solvent (in kg)In order to calculate the molality of a 12 percent urea solution, we need to first determine the mass of urea present in the solution.

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Answer:

electromagnetic waves and mechanical waves

Explanation:

I think these two kinds of waves can transmit energy through a vaccume.

Hope I helped!

Electromagnetic waves.

Gravity waves.

Ketoses such as fructose are expected to give a positive Tollens test because of their ability to reduce Tollens' reagent.

The Tollens test is a chemical reaction used to test for the presence of aldehydes. The test is named after the German chemist Bernhard Tollens. The Tollens reagent is a solution of ammoniacal silver nitrate, Ag(NH3)2NO3. The test is based on the fact that aldehydes are readily oxidized to carboxylic acids by a solution of silver nitrate in ammonia.

This reaction is exothermic and produces a silver mirror on the inside of the test tube.The test solution is prepared by adding a few drops of a solution of Tollens' reagent to the substance being tested. The test solution is then heated in a water bath for a few minutes.

If the substance being tested is an aldehyde, it will reduce the silver ions in the Tollens' reagent to metallic silver. The metallic silver will form a mirror on the inside of the test tube. If the substance being tested is not an aldehyde, no mirror will form.The aldehydes are more easily oxidized than the ketoses.

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Answer:

Chemistry, Biology, Medicine, Physics, and Geology

The fact that there are more possible combinations for amino acids than the number of amino acids themselves implies that each amino acid can be encoded by multiple codons.

A codon is a sequence of three nucleotides in DNA or RNA that corresponds to a specific amino acid.

There are 20 standard amino acids used to build proteins in living organisms. However, there are 64 possible three-letter combinations of nucleotides (4³) that can be used to form codons. This means that on average, there are more than three codons that can encode each amino acid.

To calculate the number of codons per amino acid on average, we divide the total number of codons (64) by the number of amino acids (20). Therefore, the average number of codons per amino acid is 64/20 = 3.2.

This indicates that there is a degeneracy or redundancy in the genetic code, where multiple codons can specify the same amino acid.

For example, the amino acid leucine is encoded by six different codons (UUA, UUG, CUU, CUC, CUA, CUG), while methionine and tryptophan are each encoded by a single codon.

In conclusion, the existence of more possible combinations for amino acids than amino acids themselves means that the genetic code is degenerate, allowing for redundancy and flexibility in protein synthesis.

This redundancy helps to protect against errors in DNA replication and transcription and allows for evolution to occur through the accumulation of genetic variations.

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Answer: Two effects may occur during high current flow: 1) the wire may become overheated to the point that surface oxidation or even evaporation may take place, 2) at the connection points at each end of the wire, especially if the terminations are of a different type of metal than the wire, some atoms may migrate into or out of the wire.

Answer:

As a sample of lodine-131 decays, its half-life

3) remains the same

The color from the indicator might slowly disappear even after all the acid is titrated due to the chemical equilibrium between the indicator and the solution. The indicator is usually a weak acid or base that undergoes a reversible reaction with the acid or base being titrated.

            Even when the titration is complete, some of the indicator molecules may still be in the form of the acid or base, and they may slowly react with the solution, causing the color to fade over time.It is a good idea to carry out titrations in triplicate because it helps to reduce the effects of experimental error and increases the precision of the results. Titrations are subject to a variety of sources of error, such as variations in the concentrations of the solutions, variations in the volume of the solutions dispensed, and human error in reading burette volumes and recording data. By repeating the titration three times and taking the average value, the effects of random errors can be minimized, providing more reliable and accurate results.

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Answer:

option B = A rat hides in its hole when it sees an approaching predator.

Explanation:

In order for any organisms, whether plants or animals to be able to keep being alive they have to develop a/some functions or abilities which is going to aid in their battle battle for survival, this concept is known as the Adaptive features of organisms.

From the question above, it can be seen that the oversized ears in bats is an adaptive features for them to get their food: as it helps them to use sound waves to detect the motion of their prey.

Unlike the bats, the rats adaptive features is to have a good running legs. This will help them to avoid getting eating by predators.

Answer:just saying he is correct

Explanation:

Answer:

1. conduction

2. Convection

3. Radiation

Answer:

52

Explanation:

It is True that the polar covalent bonds that hold the oxygen and hydrogen atoms together within a molecule of water, the hydrogen bonds that hold multiple water molecules together are much stronger.

Compared to the polar covalent bonds that hold the oxygen and hydrogen atoms together within a molecule of water, the hydrogen bonds that hold multiple water molecules together are much stronger. Hydrogen bonds are a type of intermolecular force that occur between the positively charged hydrogen atom of one molecule and the negatively charged oxygen or nitrogen atom of another molecule. These bonds are much stronger than the typical dipole-dipole forces that occur between polar molecules, and are a significant factor in the unique physical and biological properties of water.

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(D) \(Pb^{2+}\)<\(NO_{3} ^{-}\)=\(K^{+}\) is the right answer for the ions remaining in solution in order of increasing concentration once the reaction has stopped.

What is concentration ?

The no of mol of solute present per litre of solution is known as molarity , for normality we consider no of equivallent of solute per litre of solution.

1 mol of \(Pb(NO_{3})_{2}\) gives 2 mol of \(KNO_{3}\) here 1.5 mol of \(Pb(NO_{3})_{2}\) gives 3 mol of KNO3.

   \(Pb(NO_{3})_{2} +K_{2}S- > PbS+ 2KNO_{3}\)

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Hydroxychloroquine cannot be made from grapefruit and lemon rinds.

Hydroxychloroquine is not a natural compound, rather it can only be synthesized from quinoline molecule in the laboratories.

During the synthesis of hydroxychloroquine, several sequential chemical reactions and purifications are done.

Hydroxychloroquine is used in the treatment of:

But when grapefruit and lemon rinds are boiled in water, a natural chemical compound known as limonene is obtained.

Therefore, hydroxychloroquine cannot be made from grapefruit and lemon rinds,

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Answer:

The correct answer is A. 13 g. 16 g of O2 will react with 8 g of C2H6 (2 moles of C2H6 requires 14 moles of O2). This will produce 8/4 = 2 moles of CO2, which is 88 g of CO2. When rounded to the nearest whole number, this is 13 g.

can you give me the brilliant mark?

The correct option from the given statements concerning mixtures is (d) more than one correct response.

The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.

The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).

The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.

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Answer:

the products are more stable than the reactants

Explanation:

Measurement units are the defined units used for the particular dimensions and proportions. 3500 milliseconds are there in seconds.

Time is defined as the rate of things occurring or taking place and is given by seconds, minutes, hours etc.

Using  the conversion factor the relation between the seconds and milliseconds is:

1 second = 1000 miliseconds

Convert 3.5 seconds into milliseconds using conversion factor:

\(\begin{aligned}3.5 \;\rm seconds &= 3.5 \times 1000 \\\\&= 3500 \;\rm miliseconds\end{aligned}\)

Therefore, option C. 3500 milliseconds is correct.

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Answer:

3500 ms

Explanation:

Answer:

Water molecules pull the sodium and chloride ions apart

Explanation:

Answer:

The government raised taxes

Explanation:

France had monarchy as its form of government. After the King of France had borrowed heavily to retain his extravagant lifestyle as well as the fact that the Kingdom of France was largely indebted, the king had no other option but to increase taxes paid by commoners in France.

This happened in an era of bad harvests and famine. The commoners depended mostly on bread to survive. This made the cost of bread to alarmingly increase and most people were hungry and starving.

These happenings led to the French revolution.

Answer:

a

Explanation:

Given :

2NOBr(g) - -> 2NO(g) + Br2(g)

Initial pressure of NOBr , 1 atm .

At equilibrium, the partial pressure of NOBr is 0.82 atm.

To Find :

The equilibrium constant for the reaction .

Solution :

             2NOBr(g) - -> 2NO(g) + Br2(g)

t=0 s           1 atm                 0             0

\(t=t_{eqb}\)       1( 1-2x)               2x           x

So ,

\(1-2x=0.82\\\\x=0.09\)

At equilibrium :

\(K_{eq}=\dfrac{[NO]^2[br_2]}{[NOBr]^2}\\\\K_{eq}=\dfrac{0.18^2\times 0.9}{0.82^2}\\\\K_{eq}=0.043\ atm\)

Hence , this is the required solution .

The final pressure is 6312.935 Pa.

The final pressure of the gas can be calculated using the Ideal Gas Law, PV = nRT.

In this situation, the volume of the gas is doubled and the temperature is increased from 30 degrees Celsius to 80 degrees Celsius, while the number of moles of gas and the ideal gas constant remains constant.

Therefore, the pressure of the gas will decrease as the volume doubles and the temperature increases. The final pressure can be calculated by multiplying the initial pressure by the ratio of the initial volume to the final volume and the ratio of the final temperature to the initial temperature.

Final pressure = (Initial pressure) x (Initial volume / Final volume) x (Final temperature / Initial temperature)

The initial pressure is 67cm mercury. 1cm mercury = 133.322 Pa so 67cm mercury = 67*133.322 =8933.294 Pa.

The final temperature is 80-degree celsius = 80+273 = 353K

The final pressure =8933.294 x (1/2) x (353/303) = 6312.935 Pa

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