Perform the following conversion (a) 2.41x10² cm to meters​

The pH value of the resulting solution assume the volume of the solution is not affected by this addition is 3.283.

The pH scale determines how acidic or basic water is. The range is 0 to 14, with 7 representing neutrality. Acidity is indicated by pH values below 7, whereas baseness is shown by pH values above 7. In reality, pH is a measurement of the proportion of free hydrogen and hydroxyl ions in water.

In this Question, HF is a Weak Acid and RbF is a weak Base - HNO3  is a strong acid.

HF reaction in aqueous medium

HF +  H2O  --------- H3O+  + F -  

RbF +  H2O  ----  Rb+ +  F -

pH (Original)  =  pKa  +  log ( [salt ] / [Acid] )  

We donot need to calculate pH original -which is for the original solution before adding the strong acid.

HF is a weak acid - so in a buffer solution its dissociation is negligible - so it does not affect the H+  ion concentration much.

When a 0.012 mol of HNO3  is added to the buffer solution , it dissociates in H+ and NO-3  .

H+ ions dissociated from the Acid react with F -  and produce HF . As a result the acid concentration will increase to the extent of 0.012 mol  and the salt concentration reduces by the same extent - 0.012 mol.

So the formula for New pH changes to

pH (New)  =  pKa  +  log ( [salt ] - 0.012 mol / [Acid] + 0.012 mol)

Here , 0.012 mol are added to 281 mL solution,

Concentration of HNO3,  M = number of moles / Vol in litres  

                                            =  0.012 mol / 281 mL

                                            =  0.012 mol / 281  / 1000

                                           = [0.012 mol x 1000]  / 281 L  =  0.043 M

As pKa = -log(Ka)  ,  

Given  [salt ] =  0.480 M ,  [Acid] =  0.318 M

                   = - log(Ka) +  log [ (0.480 M - 0.043 M) / (0.318 M + 0.043 M) ]

                        =  - log (6.31 x 10-4 )   +  log ( 0.437 / 0.361)

      pH (New)    =  3.20 + 0.083  = 3.283.

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Complete question:

A biochemist wanted to adjust the pH of 281 mL of a buffer solution composed of 0.318 M HF and 0.480 M RbF (K, = 6.31e - 04) by adding 0.012 moles of HNO3. Determine the pH of the resulting solution: pH number (rtol=0.02, atol=1e-08)

molecules

B.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~`

The element with an atomic number of 11 that gets its symbol from the Latin word "natrium" is Sodium. Its symbol is "Na".

The symbol for sodium is Na, which is derived from the Latin word natrium. Sodium is a soft, silvery-white, highly reactive metal that is a member of the alkali metal group. It is an important element for many biological processes and is commonly found in salt (sodium chloride).

The other elements listed in the question are chlorine, iron, and nitrogen. Chlorine has an atomic number of 17, iron has an atomic number of 26, and nitrogen has an atomic number of 7. None of these elements gets their symbol from the Latin word natrium.

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Probable question would be

with an atomic number of 11, which of these elements gets its symbol from the latin word natrium?

Sodium

Chlorine

Iron

Nitrogen

The Baeyer permanganate test and chromic acid tests work by converting an aldehyde to a carboxylic acid functional group.

KMnO₄ and H₂CrO₄ act as oxidizing agents. A ketone does not react with these reagents because it does not have a hydrogen atom attached to the carbonyl group.

The Baeyer permanganate test is used to identify the presence of unsaturation (i.e. double bonds) in a compound. When a double bond is present in the compound, it will be oxidized by potassium permanganate (KMnO₄) to form a diol functional group. In the case of aldehydes, the double bond is present between the carbonyl carbon and the hydrogen atom.

Therefore, the reaction will convert an aldehyde to a carboxylic acid functional group. This reaction is also known as the oxidation of aldehydes with KMnO₄.

The chromic acid test is another method for identifying the presence of unsaturation in a compound. It uses chromic acid (H₂CrO₄) as the oxidizing agent. Like the Baeyer permanganate test, the chromic acid test will convert an aldehyde to a carboxylic acid functional group. It is important to note that the chromic acid test is more sensitive to the presence of double bonds than the Baeyer permanganate test.

Therefore, it is often used as a confirmatory test after a positive result is obtained from the Baeyer permanganate test.

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Yes, the response of temperature in the atmosphere to an increase in CO2 is generally consistent. As more CO2 is added to the atmosphere, it traps more heat from the sun, leading to a gradual increase in temperature. This phenomenon is known as the greenhouse effect.

The response of temperature in the atmosphere to an increase in CO2 does not always stay the same as the CO2 is progressively increased. It changes depending on various factors. This statement is backed up by scientific evidence.CO2 is known as a greenhouse gas that warms the Earth's atmosphere by absorbing and radiating energy within the infrared range.

When there is more CO2 in the atmosphere, there will be more radiation absorbed and radiated, resulting in a temperature increase.

Therefore, as the concentration of CO2 rises, the temperature of the Earth's atmosphere should also rise. However, the relationship between CO2 and temperature is not that simple.

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The three-step synthesis of the product from 1-methylcyclohexene is as follows: converted into 1-bromo-1-methylcyclohexane with HBr, use NaNH2 (sodium amide) with the product obtained from step 1 and treat the obtained intermediate from step 2 with D2O (heavy water)

It will convert the lithium (Li) atom on the cyclohexyl ring's tertiary carbon atom to a deuterium (D) atom. Here's the answer to the question: Select reagent 1: Hydrobromic acid (HBr)Select reagent 2: Sodium amide (NaNH2)Select reagent 3: Heavy water (D2O). To synthesize the desired product from 1-methylcyclohexene, follow these three steps with the corresponding reagents:

1. Reagent 1: Osmium tetroxide (OsO4)
2. Reagent 2: Sodium periodate (NaIO4)
3. Reagent 3: Sodium borohydride (NaBH4)


Add osmium tetroxide (OsO4) to the 1-methylcyclohexene. This will form a diol via dihydroxylation of the double bond. Add sodium periodate (NaIO4) to the resulting diol. This will cleave the diol into two aldehyde groups through oxidative cleavage. Add sodium borohydride (NaBH4) to the aldehydes formed in step 2. This will reduce the aldehyde groups to the corresponding alcohol groups, resulting in the desired product.

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Answer: Molecules in which three atoms are arranged in a straight line are said to have linear geometry.

What is a linear molecule?

A linear molecule is a molecule that has three or more atoms arranged in a straight line. Two main groups of linear molecules exist: homonuclear and heteronuclear. A homonuclear linear molecule has two or more identical atoms bonded to the central atom, whereas a heteronuclear linear molecule has two or more distinct atoms bonded to the central atom.

Examples of linear molecules include carbon dioxide (CO2), hydrogen cyanide (HCN), nitrogen dioxide (NO2), and sulfur dioxide (SO2).

Linear geometry is the shape of the molecule, which is governed by its geometry. The distribution of bonding electrons and non-bonding pairs in a molecule determines its shape. For instance, in a molecule with linear geometry, the bond angle between two atoms is 180 degrees (a straight line).


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Yes, the availability of oxygen and a high energy charge are required to obtain energy from acetyl CoA in the citric acid cycle.

During the citric acid cycle, the acetyl CoA is oxidized into carbon dioxide and water, which releases a large amount of energy in the form of ATP. This process occurs in the mitochondria of eukaryotic cells and requires a continuous supply of oxygen.

The availability of oxygen is essential as it serves as the final electron acceptor in the electron transport chain, which is responsible for generating the high energy charge in the form of ATP. Without oxygen, the electron transport chain cannot function, leading to a buildup of high energy intermediates that can be harmful to the cell.

A high energy charge is required for the citric acid cycle to proceed as it requires a large amount of ATP to drive the different reactions. The energy charge is maintained by the balance between ATP production and consumption within the cell. If the energy charge drops too low, the citric acid cycle slows down, leading to a decrease in ATP production.

In summary, the availability of oxygen and a high energy charge are both essential for obtaining energy from acetyl CoA in the citric acid cycle

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The molecular formula of a certain compound is x2O3. If 18.88 g of the compound contains 10 g of x, the atomic mass of x is approximately 54 g.

Let's assume that the number of atoms of X in the molecular formula is equal to 'a'.

Then, the molecular mass of the compound will be equal to:-

(a × atomic mass of X) + (2 × molar mass of O) = 2a(MX) + 3 × 16 = 2a(MX) + 48

The atomic mass of X can be determined by finding the value of a.

The molecular mass of the compound = 18.88 g/mol

Mass of X = 10 g

We can calculate the value of a by simplifying the equation:-

2a(MX) + 48 = 18.88MX = (18.88 - 48)/- 4aMX = 14/3a

Now, on substituting the values,

The atomic mass of X = (18.88 g/mol × [14/3a])/[2(14/3a) + 3 × 16]

On simplifying the above equation:-

The atomic mass of X = (9.44 × 3a)/[28a + 144] (The denominator can be simplified by factoring 4)

The atomic mass of X = (9.44 × 3a)/(4 × (7a + 36))= 2.4 g/mol

For the given question, the atomic mass of X is approximately 54 g, so the correct answer is option b.

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The red line shows that at 70 °C, 200 g of water will be saturated with about 140 g or potassium nitrate.

This mass of a compound would be divided by mass of the solvent, and then divided by 100 g to determine its solubility. This calculation will give the solubility of the substance in g/100g.

The curves demonstrate that when temperature rises, solubility of any and all three solutes increases. The most noticeable increase in solubility is for potassium nitrate, which goes from about 30 g per 100 g of water from over 200 grams per 100 grams of water.

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The water distributed on Earth from the greatest to the least is saltwater, freshwater, and frozen water.

Saltwater occupies 97.5% of Earth's total water. Freshwater occupies only 2.5% of Earth's total water. This freshwater is found in different forms, such as rivers, lakes, underground, and glaciers. Only 0.3% of freshwater is found in rivers and lakes, while 30% is stored underground. The rest of freshwater is stored in glaciers and polar ice caps.

The frozen water found on Earth is 1.7% of the total water. It is found in glaciers, ice caps, and snow cover around the poles. The water cycle is a natural process that allows water to move from one place to another on Earth. It is also called the hydrologic cycle. It involves the movement of water between the earth, air, and ocean.

Water evaporates from the surface of the earth, which forms clouds. The clouds then precipitate as rain, snow, or hail. This precipitation may fall on the land and join rivers and lakes, or it may seep into the ground and form underground water. The underground water may then resurface as springs or streams, which then join rivers and lakes.

The water cycle helps to purify water and replenish freshwater resources on earth. It also helps to regulate the Earth's temperature by absorbing heat during the day and releasing it at night.

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The coulombs of electricity used will be 9,650 C.

To calculate the coulombs of electricity used in this experiment, you must first determine the number of moles of SnSO4 that were reacted.

5.51 g of metallic tin produced indicates that 0.100 moles of SnSO4 were reacted.

Now, coulombs of electricity can be determined using the equation Q = I x t, where I is the current, and t is the time.

Using the information provided, we can determine that the coulombs of electricity used in this experiment is equal to (I x t) = (steady current x time until 5.51 g of metallic tin was produced).

The coulombs of electricity used in this experiment can also be determined by considering the Faraday’s constant, which states that the amount of electricity needed to completely react one mole of a substance is equal to 96,500 coulombs.

Since the reaction involves 0.100 moles of SnSO4, the amount of electricity used is equal to 0.100 moles x 96,500 coulombs, which is equal to 9,650 coulombs.

To summarize, the amount of coulombs of electricity used in this experiment is 9,650 coulombs, and this can be determined using the equation Q = I x t, or by considering the Faraday’s constant. This amount of coulombs of electricity was used until 5.51 g of metallic tin was produced.

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The true statements about the rate-limiting step in a reaction are it is the slowest step and it limits (or determines) the rate of the reaction. Therefore, option A is correct.

The rate-limiting step is the step in a reaction that has the highest activation energy and therefore proceeds at the slowest rate. It sets the overall rate of the reaction because the other steps in the reaction cannot occur faster than the rate of the rate-limiting step.

However, the rate law of the reaction is determined by the slowest elementary step, which may or may not be the rate-limiting step.

The rate-limiting step is not always the first step in a reaction. It can be any step in the reaction mechanism.

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The mole ratio of calcium ions to EDTA molecules is 1:1.

EDTA (ethylene diamine tetraacetic acid) is a molecule composed of two nitrogen atoms, two oxygen atoms, four acetate (CH₃COO⁻) groups, and two ethylene (CH₂CH₂) groups.

It binds to cations, particularly divalent cations like calcium ions (Ca2+). Each EDTA molecule binds to one calcium ion, forming an octahedral complex.

The process of binding is a result of the EDTA molecule's geometry and the ionic nature of the calcium cation.

The four acetate groups of EDTA are arranged in a square planar structure, while the two nitrogen atoms and the two ethylene groups form a loop on the upper side of the molecule.

When the EDTA molecule is exposed to calcium ions in an aqueous solution, the calcium cation binds to the nitrogen atoms and the ethylene groups, forming a six-membered ring.

This complex is referred to as an EDTA–Ca2+ octahedral complex.

The 1:1 mole ratio of EDTA and calcium ions is important for understanding the chemistry of EDTA, as well as for applications such as buffering and sequestering.

Buffering solutions help maintain a stable pH level, and sequestering solutions are used to bind and remove metal ions from a solution. The 1:1 ratio of EDTA to calcium ions is essential for both of these applications.

The mole ratio of calcium ions to EDTA molecules is 1:1. This ratio is necessary for understanding the chemistry of EDTA, as well as for applications such as buffering and sequestering.

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Answer: The pH of the solution is 9.22.

Explanation:

The given solution is a mixture of 200 mL of 0.20 M NaH2PO4 and 200 mL of 0.60 M Na2HPO4. NaH2PO4 is a weak acid and Na2HPO4 is a weak base. When they are mixed, they undergo a buffer solution.

The Henderson-Hasselbalch equation for a buffer is:

pH = pKa + log ([A-]/[HA])

Where,

pKa = -log Ka (dissociation constant of the acid)

[HA] = concentration of the acid (NaH2PO4)

[A-] = concentration of the conjugate base (HPO42-)

The pKa value for NaH2PO4 is 7.21 (at 25°C). The concentrations of the acid and the conjugate base can be calculated as follows:

For NaH2PO4:

moles of NaH2PO4 = 0.20 M x 0.2 L = 0.04 mol

concentration of NaH2PO4 = 0.04 mol / 0.4 L = 0.10 M

For Na2HPO4:

moles of Na2HPO4 = 0.60 M x 0.2 L = 0.12 mol

concentration of Na2HPO4 = 0.12 mol / 0.4 L = 0.30 M

Using the Henderson-Hasselbalch equation and substituting the values:

pH = 7.21 + log ([HPO42-]/[H2PO4-])

pH = 7.21 + log (0.30/0.10)

pH = 9.22

Therefore, the pH of the solution is 9.22.

If you conducted this coupling step under acidic conditions, you expect the reaction rate to be affected because at low pH values, the carboxylic acid is transformed into a more electrophilic species, which is easily attacked by the nucleophile, and the yield of the amide bond would be high.

In organic synthesis, coupling reactions are common, and they include the combination of a nucleophile with an electrophile to form a covalent bond. The coupling reaction between a carboxylic acid and an amine is a straightforward way to synthesize an amide in the presence of an activating agent (a molecule that can increase the electrophilicity of the carboxylic acid).

It is worth noting that there are various methods for synthesizing amides, including chemical and enzymatic methods. Coupling reactions are the most frequent chemical methods used for the synthesis of amides.

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The statement "it is fine to enter an area where there is a chemical spill as long as you are very careful" is False. because A chemical spill refers to the uncontrolled release of one or more hazardous substances.

A chemical spill refers to the uncontrolled release of one or more hazardous substances, which can include liquids, gases, or solids, which might pose a significant threat to the environment and human health. The person responsible for a chemical spill is responsible for managing, containing, and cleaning up the hazardous material to prevent environmental or public health damage.

Following a chemical spill, there is a protocol to be followed to guarantee that no harmful substances have been released into the environment that may cause harm to the public. The presence of toxic chemicals in a confined area poses a significant threat to human health, making it hazardous to enter that location. Even if the spill is small, entering an area where a chemical spill has occurred is hazardous. The contamination may disperse through the air, and you may inhale it or the substance may adhere to your clothing and skin, putting you at risk. You should not go near a chemical spill if you are not wearing appropriate protective gear. This is because it is not advisable to enter an area where there is a chemical spill.

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When reactant molecules bind to the active site, the conformational or shape change that enzymes undergo is called induced fit.

Induced fit is the change in the shape of the active site of an enzyme, caused by the binding of a substrate. Induced fit helps in the proper alignment of the substrate with the catalytic site of the enzyme. It enhances the ability of the enzyme to carry out the chemical reaction.

Induced fit is a term used in biochemistry and enzyme kinetics. It describes the process of conformational changes in an enzyme when it binds to a substrate. This change helps in the proper orientation of the enzyme and substrate for the chemical reaction to occur.

Therefore we can say that the conformational or shape change that enzymes undergo when reactant molecules bind to the active site is called "induced fit."

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The mass percentage of CaCO₃ in the 3.83 g piece of limestone is 66.8%.

This can be calculated by taking the mass of CaCO₃ (2.57 g) and dividing it by the total mass of limestone (3.83 g) and multiplying by 100.

To calculate this, you need to take the mass of CaCO₃ (2.57 g) and divide it by the total mass of limestone (3.83 g).

This gives you a decimal value, which you then need to multiply by 100 to get the percentage value.

In this case, 2.57/3.83 = 0.668, which multiplied by 100 gives you 66.8%. This is the mass percentage of CaCO₃ in the limestone.

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Polar covalent bonds are formed when the electrons in the bond are not shared equally between the two nuclei. One of these molecules contains polar bonds is H2O.

Polarity occurs when the electron pair of a bond is unevenly distributed between two atoms. A polar bond has a positive and negative end, unlike a nonpolar bond. The polarity of a bond can be determined by a difference in electronegativity between two atoms. Polar covalent bond is a type of covalent bond in which the atoms share electrons in an unequal manner.

Polar covalent bonds have a positive and a negative end. The positive end of the bond is that part of the bond that is less electronegative, whereas the negative end is that part of the bond that is more electronegative. The molecule that contains polar bonds is H2O (water), the bond between the oxygen atom and the hydrogen atoms in water is polar because the oxygen atom is more electronegative than the hydrogen atoms, causing the electrons to be drawn closer to the oxygen atom, creating a partial negative charge on the oxygen and a partial positive charge on the hydrogen atoms. As a result, water has a polarity.

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Answer: The percentage of the (R)-limonene in the sample is 67.24%.

The percentage of the (R)-limonene in a sample of limonene with a specific rotation of -38 can be calculated using the following equation:

Percentage (R)-limonene = (Specific rotation of sample - Specific rotation of (S)-limonene) ÷ (Specific rotation of (S)-limonene) x 100%

In this case, the equation is:

Percentage (R)-limonene = (-38 - (-116)) ÷ (-116) x 100% = 67.24%

Therefore, the percentage of the (R)-limonene in the sample is 67.24%.

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Answer: 100cm3 of gas at 27°c exert a pressure of 750mmHg. Calculate its pressure if it's volume is increased to 250cm3 at 127°c? In Chemistry

Explanation:

The average kinetic energy (avg ke) of an ideal gas varies inversely with the molar mass of the gas.

The formula for average kinetic energy is KE=3/2 kT, where k is the Boltzmann constant and T is the temperature in Kelvin.

According to this formula, the average kinetic energy of gas molecules is proportional to temperature.

The ideal gas law is a combination of Boyle's Law, Charles' Law, and Avogadro's Law, which are the three laws governing the behavior of ideal gases.

The ideal gas law can be expressed as PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature.



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The empirical formula of the given compound can be determined as follows the CHOS or C3H4O3.

According to the given data, the compound citric acid contains 37.51% C, 4.20% H, and 58.29% O by mass. So, let's assume that we have 100 g of citric acid, and then, we can find the masses of each element present in it: Mass of carbon = 37.51 gMass of hydrogen = 4.20 g. Mass of oxygen = 58.29 g.

Next, we need to convert the masses into the number of moles using the molar masses of the elements. The molar mass of carbon = 12.01 g/mol, Number of moles of carbon = 37.51 g / 12.01 g/mol = 3.124 molMolar mass of hydrogen = 1.01 g/molNumber of moles of hydrogen = 4.20 g / 1.01 g/mol = 4.158 molMolar mass of oxygen = 16.00 g/molNumber of moles of oxygen = 58.29 g / 16.00 g/mol = 3.643 follow, we need to find the simplest whole-number ratio of these moles by dividing them by the smallest number of moles, which is 3.124 mol: Carbon = 3.124 mol / 3.124 mol = 1Hydrogen = 4.158 mol / 3.124 mol = 1.33 ≈ 1Oxygen = 3.643 mol / 3.124 mol = 1.17 ≈ 1So, the empirical formula of citric acid is CHOS or C3H4O3.

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When a metal is placed in the fire and an electron absorbs enough energy to be promoted to a higher energy state, this higher energy state is referred to as the excited state.

An excited state is a state of a molecule or atom in which it has absorbed sufficient energy to move an electron from its current orbital to a higher orbital. This state is referred to as the excited state, and the electron that has been elevated to a higher energy level is said to be in an excited state.

The reason behind the electron's promotion to a higher energy state when a metal is placed in fire is that the heat causes the electrons to absorb energy, which causes them to move to a higher energy state. When electrons move to higher energy states, they release energy in the form of light, heat, or other radiation.

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In summary, a bond having "more ionic" or "more covalent" character refers to the degree to which the bond is either purely ionic or purely covalent, with most bonds falling somewhere in between.

When a bond has more ionic character, it means that the electrons are transferred more completely from one atom to another, resulting in larger differences in electronegativity and a greater degree of charge separation between the atoms. This typically occurs when there is a large difference in electronegativity between the atoms involved in the bond.

On the other hand, when a bond has more covalent character, it means that the electrons are shared more equally between the atoms, resulting in a smaller difference in electronegativity and less charge separation. This typically occurs when the atoms involved in the bond have similar electronegativities.

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1. We can see here that critical mass is important for a fission chain reaction because: C. It allow neutrons to be absorbed by other fissionable nuclei.

Fission chain reaction is a self-sustaining reaction in which the splitting of atomic nuclei of a particular material, such as uranium or plutonium, releases a large amount of energy in the form of heat and radiation.

2. A moderator is important for a fission chain reaction because: A. it keeps the neutrons from escaping the sample.

3. Enrichment is important for a fission chain reaction because: D.  it provides enough fuel to make enough energy.

A moderator is important for a fission chain reaction because it slows down the fast-moving neutrons, making them more likely to be absorbed by other fissionable nuclei and sustain the chain reaction. Without a moderator, the neutrons would move too quickly to be efficiently absorbed.

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In this reaction, 10 cm³ of CO is mixed with 15 cm³ of oxygen. After the reaction, the volume of the product is 20 cm³. When shaken with aqueous sodium hydroxide, the volume is reduced to 10 cm³. This agrees with Gay Lussac's Law.

According to Gay Lussac's Law, the ratio of the volumes of the reactants and products of a reaction are constant when pressure and temperature are held constant. In this reaction, 10 cm³ of CO is mixed with 15 cm³ of oxygen. After the reaction, the volume of the product is 20 cm³. When shaken with aqueous sodium hydroxide, the volume is reduced to 10 cm³. This agrees with Gay Lussac's Law since the ratio of the initial reactant volumes (10 cm³ to 15 cm³) is the same as the ratio of the final product volumes (20 cm³ to 10 cm³).

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