All of the following are physical changes except
A. ice melting.
B. plaster hardening.
C. paint drying.
D. rocket fuel burning.

Answer:

To produce energy from food

Explanation:

It's pretty much an energy cycle

The mass of sodium hydroxide required to make 200 cm³ of sodium hydroxide solution of concentration 0.4 mol/dm³ is 3.2 g/

The correct option is B.

In terms of the amount of material per unit volume of solution, molar concentration is a measurement of the concentration of a chemical species, specifically a solute in a solution. The most frequent measure of molarity in chemistry is the number of moles per liter, denoted by the unit symbol mol/L or mol/dm³ in SI units.

Mathematically;

Molar concentration = number of moles/volume in liters

Hence: the number of moles = molar concentration * volume in liters

The number of moles of sodium hydroxide in the solution will be:

number of moles = 0.4 * 200 * 1/1000

number of moles = 0.08

The mass of sodium hydroxide required is obtained from the formula below:

mass = number of moles * molar mass

molar mass of sodium hydroxide = 40 g/mol

Mass of sodium hydroxide required = 0.08 * 40

Mass of sodium hydroxide required = 3.2 g

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The range of the set of data given in the question above is 0.30 cm (Option D)

From the basic knowledge of statistics, we understood that the range of a given data is defined as the difference between the highest value and the lowest value in the data. This is written as follow:

Range = Highest value - lowest value

With the above formula, we can obtain the range of the data given in the question. Details below:

Range = Highest length - lowest length

Range = 8.5 - 8.2

Range = 0.30 cm

Thus, the range is 0.30 cm (Option D)

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When an air bubble rises in water, it's mass remains same whereas density decreases and volume increases.

When an air bubble rises in the water, then mass of the air in the bubble does not change. The volume of bubble increases as the pressure on it decreases. Volume of the bubble becomes almost 1.6 times to initial volume of bubble.

Pressure decreases as as it ascends, less water is above it that is pressing down on it. As, the mass is unchanging but volume is increasing, then the density decreases.

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Options (c), (d), and (e) are correct. The solvent that can be used for proton NMR analyses would be chloroform-d, acetone-d6, and deuterium oxide. This is because all the above solvents are deuterated.

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option d The two sigma bonds form between a hybrid sp orbital on Hg and a p orbital on Cl indicates the orbitals which  overlap to form the σ bonds in the following molecules. HgCl2

Sigma bonds are the most powerful type of chemical bond. They are established by atomic orbitals overlapping head-on. For diatomic molecules, sigma bonding is most simply defined to use the language and techniques of symmetry groups. When one s and one p orbital within the same main atom's outer shell combine to form two new equivalent orbitals, this is made reference to as sp hybridization. The recently created orbitals are recognised as sp hybridised orbitals. It produces linear molecules with a 180° angle.

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Milk — pasteurized, canned, or dry — is an acid-forming food. Its pH level is below neutral at about 6.7 to 6.9. This is because it contains lactic acid.

However, keep in mind that more essential than the precise pH level is whether it is acid-forming or alkaline-forming. Additionally acid-forming dairy products include butter, hard cheeses, cottage cheese, and ice cream. Despite having low pH values between 4.4 and 4.8, yoghurt and buttermilk are foods that contribute to alkalinity.

Raw milk is another exception, according to the American College of Healthcare Sciences, as it may generate an alkaline environment. However, drinking untreated milk might not be a good idea.

The taste of milk is not acidic. It's even suggested as a treatment for heartburn or acid reflux. Milk might provide symptom relief momentarily. This is so that the oesophagus and stomach can be protected by the fat in milk.

Milk consumption, however, could exacerbate heartburn symptoms. Milk increases stomach production.

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the structure of 3-lodo-2,2,4,4-tetramethylpentane is shown in the below image.

Tetramethylpentane is a hydrocarbon compound with the molecular formula C8H18. It is a saturated aliphatic compound, which means it is composed of only carbon and hydrogen atoms and has no double or triple bonds. It is also a branched-chain compound, meaning that its carbon atoms are connected in a branching pattern. It is a liquid at room temperature and is used as a reference fuel in engine research.A hydrocarbon is a compound that is composed of only carbon and hydrogen atoms. Hydrocarbons can be classified into two main categories: saturated and unsaturated. Saturated hydrocarbons are compounds that have only single bonds between carbon atoms and are therefore considered "fully saturated" with hydrogen atoms.

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The value of the specific rate constant for the reaction is 0.0426 (M/s)^3. To determine the reactant orders, we need to use the initial rate data and the method of initial rates.

The method of initial rates involves changing the concentration of one reactant while keeping the other reactants constant. From the initial rate data, we can see that when [Br1-] is changed, the rate of the reaction changes (experiments 1, 2, and 3). Therefore, the order of Br1- is not zero. When [BrO31-] is changed, the rate of the reaction changes (experiments 2 and 3). Therefore, the order of BrO31- is not zero. When [H1+] is changed, the rate of the reaction changes (experiments 1, 2, and 4). Therefore, the order of H1+ is not zero.

From this, we can conclude that the reactant orders are:

= Order of Br1- = 1

= Order of BrO31- = 1

= Order of H1+ = 1

The rate constant k is the proportionality factor between the rate of the reaction and the concentrations of the reactants. The units of k depend on the reactant orders. Since the overall order of the reaction is the sum of the individual reactant orders, in this case the overall order of the reaction is 1+1+1=3. Therefore, the unit of k is (M/s)^3.

To find the value of the specific rate constant for the reaction, we can use the following equation:

= -d[Br1-]/dt

= k[Br1-][BrO31-][H1+]

By substituting the experimental value of the initial rates, we can find the specific rate constant for the reaction.

= -d[Br1-]/dt

= k[Br1-][BrO31-][H1+]

= 8.10e-03

= k10.1300.1500.270

= k

= 8.10e-03/(10.1300.150*0.270)

= k

= 0.0426

The specific rate constant for the reaction is 0.0426 (M/s)^3. It's worth to mention that the rate constant for the disappearance of Br1- is not the same as the rate constant for the reaction because it only consider the disappearance of one of the reactants, but the rate constant for the reaction consider all the reactants.

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Yes, it is adjust since when salute may be a break up when salute is broken down into the dissolvable, then it'll frame the arrangement, at that point it'll frame the arrangement. So it has changed the chemical property.

The dissolution of a solute in a dissolvable to create a arrangement does not include a chemical change (that it could be a physical alter). Disintegration of a solute in a dissolvable to create a arrangement does not include a chemical change.

Solvation, or disintegration, is the method by which a solute breaks up into a dissolvable.

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Matter is said to be made up of particles that are constantly moving. All particles have energy, but the energy has a variation depending on the temperature the sample of matter is in.

The kinetic energy of an object is the energy that it possesses due to its motion and is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.

All particles have energy and  in turn the phenomena determines whether the substance exists in the solid, liquid, or gaseous state. Molecules in the solid phase have the least amount of energy, while gas particles have the greatest amount of energy.

The temperature of a substance is a measure of the average kinetic energy of the particles.

With respect to the changes in particle motion, temperature, and kinetic energy when liquid chocolate is poured into a mold, we can say that a change in phase may occur when the energy of the particles is changed.

There are spaces between particles of matter of the chocolate. The average amount of empty space between the molecules gets progressively larger as the sample of matter moves from the solid to the liquid and gas phases. There are attractive forces between the chocolate molecules, and these become stronger as the particles move closer together.

In conclusion, the attractive forces are called intermolecular forces.

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The 3.40 x 1022 formula units of table salt, NaCl, by converting is 6 grams.

The term solution is defined as the homogenous mixture of the solute and solvent.

In step 1

It is known that a value of "x" % (m/m) means:

"x" grams in 100 grams of solution

In step 2

Given

3.40 x 10²² formula units of table salt

NaCl mass in grams ?

In step 3

Now,

58.44g NaCl ------------ 100 g of solution

3.40 NaCl ------------- X

X = 3.40 NaCl x 100 g of solution/58.44 g NaCl

X = 5.81 g

= 6g approx.

Thus, The 3.40 x 1022 formula units of table salt, NaCl, by converting is 6 grams.

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Answer:

Explanation:

Benzoic acid is a weak acid and is slightly soluble in water. It will dissolve in cold water to a certain extent, but not completely. This can be detected by using litmus paper. Blue litmus paper will turn red when it comes into contact with an acidic solution, indicating the presence of benzoic acid. Therefore, it can be detected that benzoic acid will dissolve in cold water to a certain extent but not completely.

Hydrocarbons 6H, 2H, 1H, and 1H are all present as constituents of the molecule C4H10O.

The double bond equivalent, to put it simply, is the ratio of the number of double bonds and triple bonds present in organic compounds. Consider the case of benzene, which has four double bonds, or three double bonds and one ring.

a type of chemical connection when two atoms within the same molecule share two pairs of electrons (see single bond, triple bond).

We must first determine the double bond equivalent, which is equal to C – H/2 + 1.

To C4H10O

Double-bond equivalent: 4 - 10/2 + 1

equivalent of a double bond is zero

Both rings and the double bond don't exist.

So it is an aliphatic molecule with four different proton kinds.

The compound given is attached below with its structure.

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Diffusion is the spontaneous movement, equations regarding diffusion of two gases, a and b like a into b or b into a or a and b into a container are as follows:-

1. Diffusion of gas a into gas b:

a (gas) → b (gas)

2. Diffusion of gas b into gas a:

b (gas) → a (gas)

3. Diffusion of gas a and gas b into a container with a partition:

a (gas) + b (gas) → a (gas) + b (gas) (on opposite sides of partition)

4. Diffusion of gas a and gas b through a membrane:

a (gas) + b (gas) → a (gas) + b (gas) (on opposite sides of the membrane)

5. Diffusion of gas a and gas b into a container without a partition:

a (gas) + b (gas) → mixture of a and b (gas)

It's worth noting that diffusion is the spontaneous movement of particles from an area of higher concentration to an area of lower concentration until equilibrium is reached.

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Question - complete each of the following equations regarding diffusion of two gases, a and b.

1. Diffusion of gas a into gas b

2. Diffusion of gas b into gas a

3. Diffusion of gas a and gas b into a container with a partition.

4. Diffusion of gas a and gas b through a membrane.

5. Diffusion of gas a and gas b into a container without a partition:

Cyclohexanone (also known as oxocyclohexane, pimelic ketone, ketohexamethylene, cyclohexyl ketone or ketocyclohexane) is a six-carbon cyclic molecule with a ketone functional group.

The liquid cyclohexanone has a nice smell and is colourless to pale yellow in appearance. not as dense as water. 111 °F flash point. heavier than air vapours. utilised as a solvent, a chemical reaction media, and to produce nylon. A cyclic ketone called cyclohexanone is made up of cyclohexane with a single oxo group.

It serves as a xenobiotic metabolite for humans. Cyclohexanone is a six-carbon cyclic molecule having a ketone functional group. It is also known as oxocyclohexane, pimelic ketone, ketohexamethylene, cyclohexyl ketone, or ketocyclohexane.

It has an acetone-like scent and is an oily, colourless liquid. In heating systems, conductive liquids like boiler water and heat transfer fluids like morpholin are stabilised by morpholin. As a base that neutralises acid pollution in heat, morpholine serves as one of the main mechanisms by which it accomplishes this.

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The product of the enamine formed between acetophenone and dimethyl pyrrolidine, as a nucleophile, dimethyl pyrrolidine attacks the carbonyl in this situation to produce the enamine.

Secondary amines react with carbonyl compounds to produce enamines as a byproduct. The secondary amines pyrrolidine, piperidine, and morpholine are frequently used to create enamines. Enamines act as nucleophiles and cause an alkylation at a position corresponding to a carbon atom in the original carbonyl compound.

Due to the absence of the additional nitrogen atom required for imine formation, secondary amines form a distinctly different functional group following nucleophilic addition. A hydrogen atom is taken out of a carbon next to it during this reaction, creating a C=C bond.

Structure of the product of the enamine formed between acetophenone and pyrrolidine is attached below.

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An enzyme-catalyzed reaction proceeds more quickly than an uncatalyzed reaction. The right answer is c).

Proteins called enzymes aid in increasing our bodies' chemical reactions, or metabolism. Whereas other enzymes are broken down, others are produced. A component of all living creatures is an enzyme. Enzymes are created by our bodies spontaneously. Enzymes are, however, found in both food & manufactured goods.

The vital function of enzymes is to reduce the activation energy of a reaction, or the amount of electricity needed for the process to start. Enzymes bind to host molecules to hold them together to aid in the formation and breaking of chemical bonds.

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The Complete Question :

Compared to an uncatalyzed reaction, an enzyme-catalyzed reaction

a) produces different products

b) requires a higher temperature

c) occurs at a faster rate

d) uses less substrate

e) requires more energy

2.5 to 1. Imidazolium ion will deprotonate to imidazole at pH 7.4 because it is more basic than pKa, which results in more imidazole being present overall.

Imidazole becomes charged when it is protonated (i.e., in acid or HA+ form). It is uncharged when it is in its deprotonated (basin or A) form. Therefore, the uncharged:charged species ratio is [A][HA+], or 10:1.

The chromatography column's beads that are coated with nickel ions to which tagged proteins are bound are eluted using imidazole. In order to release the His-tagged proteins from nickel coordination, too much imidazole is delivered through the column. This causes the His-tag to be dislodged from nickel coordination.

2.5 to 1. Imidazolium ion will deprotonate to imidazole at pH 7.4 because it is more basic than pKa, which results in more imidazole being present overall.

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The isomerization of methyl isocyanide to acetonitrile is an exothermic process with a predicted enthalpy change of -287 kJ/mol.

The isomerization of methyl isocyanide to acetonitrile is a complex process that involves breaking several bonds and forming new ones. The enthalpy change (ΔH) for this process can be estimated by considering the bond energies of the bonds that are broken and formed during the reaction.

The process involves breaking a C-N triple bond and forming a C-C single bond, and a C-N single bond. The bond energies of these bonds are:

C-N triple bond: 945 kJ/mol

C-C single bond: 347 kJ/mol

C-N single bond: 311 kJ/mol

To predict the enthalpy change for the reaction, we can use the following equation:

ΔH = (bonds formed) - (bonds broken)

The bonds that are broken are the C-N triple bond and the bonds that are formed are the C-C single bond and the C-N single bond.

ΔH = (347 kJ/mol + 311 kJ/mol) - (945 kJ/mol) = -287 kJ/mol.

Therefore, the isomerization of methyl isocyanide to acetonitrile is an exothermic process with a predicted enthalpy change of -287 kJ/mol.

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The balanced nuclear equation for the formation of ²⁰³Bi (83) through a decay is ²⁰⁷At(87) → ²⁰³Bi(83) + ⁴He(2)(alpha)

In nuclear fusion, nuclear fission, and radioactive decay, the reactants and products are represented by nuclear equations. Nuclear reactions show the conservation of atomic mass and proton number rather than the different number of elements as in chemical equations.

Nuclear reactions can be divided into three categories:

Nuclear fusion is the joining of two tiny atomic nuclei to form a single larger nucleus.

Nuclear fission is the division of an enormous atomic nucleus into smaller pieces.

The transformation of a less stable nucleus into a more stable nucleus is known as radioactive decay.

²⁰⁷At(87) → ²⁰³Bi(83) + ⁴He(2)( alpha )

final product mass = 243-4-0-4 = 235

final product atomic number = 95-2+1-2 = 92

hence final product 235U(92)Â.

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The number of stages in the mechanism is the easiest method to tell the difference between E1 and E2.

Strong bases support the E2 mechanism while merely a weak base is necessary for the E1 mechanism. 2) The solvent: Effective ionising solvents (polar protics) support the E1 process by stabilising the intermediate carbocation.

The base's composition plays a crucial role in an E2 reaction since it is involved in the step that determines rate. More reactive bases will encourage an E2 reaction.

Steps in the process. Counting the steps in the mechanism is the most straightforward approach to tell E1 from E2 in a system. In contrast to E2, which occurs in a single step without an intermediate step, E1 involves two stages and a carbocation intermediate.

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The nuclear binding energy per nucleon for deuterium, ab/A, can be calculated by multiplying the mass defect m by the mass-energy equivalent 8 931.4941 MeV u1 and dividing the result by two to account for the deuterium mass number A.

A neutron weighs 1.6749 x 10-27 kg and a proton weighs 1.6726 x 10-27 kg, respectively. 2) Subtract the known nucleus mass. = 36 x 10-14 J = 3.6 x 10-13 J E. One deuterium nucleus and one tritium nucleus combine to form deuterium-tritium fusion, a type of nuclear fusion that releases one helium nucleus, one free neutron, and 17.6 MeV of energy. The binding energy is the amount of energy necessary to disassemble the nucleus into its component parts.

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Answer:

he element is Neon (Ne).

Neon's unusually high third ionization energy is due to its stable electron configuration. On a Bohr diagram, Neon has two electrons in the 1s orbital, eight electrons in the 2s and 2p orbitals, and two electrons in the 3s orbital, giving it a complete shell of eight electrons (a stable configuration). This means that it takes more energy to first remove an electron from the third orbital, accounting for its unusually high 3rd ionization energy.

Neon (Ne), which is in the second period and possesses an incredibly high third ionization energy, is the element.

The persistent electron structure of neon contributes to its very high third ionization energy. Neon has two electrons in the 1s orbital, eight electrons in the 2s and 2p orbitals, two electrons in the 3s orbital, and a total of eight electrons in the entire eight-element shell on a Bohr diagram (a stable configuration).

As a result, the explanation for the exceptionally high third ionization energy is that it requires more energy to first remove an electron from the third orbital.

Chemically speaking, neon is an element with the symbol Ne and atomic number 10. Noble gas describes it. Under normal circumstances, neon is a colorless, odorless, inactive monatomic gas, with roughly two-thirds of its mass.

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According to the theory behind molecular orbitals, molecule orbitals are created by combining atomic orbitals with similar energies and symmetry. Combining atomic and molecular orbitals equals the number of orbitals in an atom.

In[tex]$\mathrm{H}_2^{-}$[/tex]each hydrogen atom contains one electrons and one electron is counted from negative charge, thus total number of electrons present in [tex]$\mathrm{H}_2^{-}$[/tex]is 3. The bonding molecular orbital consists of two electrons, while in antibonding molecular orbital, one electron is present.

The bond order of molecules is calculated by respective formula:-

Bond order [tex]$=\frac{1}{2}\left[\mathrm{~N}_{\mathrm{B}}-\mathrm{N}_{\mathrm{A}}\right]$[/tex]

Where,

[tex]- $\mathrm{N}_{\mathrm{B}}=$[/tex] Number of electrons present in bonding molecular orbital.

Bond order of [tex]f $\mathrm{H}_2^{-}=\frac{1}{2}\left[\begin{array}{ll}2 & -1\end{array}\right]$[/tex]

Bond order of [tex]$\mathrm{H}_2^{-}=\frac{1}{2}$[/tex]

Bond order of[tex]$\mathrm{H}_2^{-}=0.5$[/tex]

[tex]- $\mathrm{N}_{\mathrm{A}}=$[/tex] Number of electrons present in anti-bonding orbital.

The molecular orbital diagram [tex]$\mathrm{H}_2^{-}$[/tex] is shown below-

H 2's molecular orbital diagram when light is present,

Bondorderof [tex]$\mathrm{H}_2^{-}=\frac{1}{2}\left[\begin{array}{ll}1 & -2\end{array}\right]$[/tex]

Bondorderof [tex]$\mathrm{H}_2^{-}=\frac{-1}{2}$[/tex]

Bondorderof [tex]$\mathrm{H}_2^{-}=-0.5$[/tex]

Since the value of bond order is negative, the [tex]$\mathrm{H}_2^{-}$[/tex]ion is not stable in the presence of light.

The complete question is,
Sketch the molecular orbitals of the[tex]$\mathrm{H}_2{ }^{-}$[/tex]ion and draw its energy level diagram. Suppose that the ion is excited by light, so that an electron moves from a lower-energy to a higher-energy molecular orbital. Would you expect the excited-state [tex]$\mathrm{H}_2{ }^{-}$[/tex]ion to be stable?

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Here, we'll see at a few sorts of vitality that are especially critical in organic frameworks, counting motor vitality, potential vitality, and chemical vitality (the potential vitality of chemical bonds).

They are broken down into fundamental atoms, like amino acids and glucose, which are either utilized as vitality or reassembled and put away in other shapes, like glycogen. The nearness of chemical vitality in nourishment is pivotal to giving our bodies with the vitality they ought to keep us moving and lively.

Chemical vitality is vitality put away within the bonds of iotas and atoms. Batteries, biomass, petroleum, normal gas, and coal are cases of chemical vitality. For case, chemical vitality is changed over to warm vitality when individuals burn wood in a chimney or burn gasoline in a car's motor.

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Answer:

299 mL/m

Explanation:

[tex](\frac{29.9L}{1 cm})(\frac{1000mL}{1L})(\frac{1 cm}{100 m}) = \frac{(29.9)(1000mL)}{100 m} = 299 mL/m[/tex]

The law of conservation of matter states that d. matter cannot be created or destroyed.

The law of conservation of matter is a model well sustained by scientific evidence which indicated that matter and energy are interchangeable but they can't be created or destroyed under any type of circumstance in space.

Therefore, with this data, we can see that the law of conservation of matter indicated it is unique and therefore cannot be created in the universe under normal conditions.

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To make 75.0 mL of 3.50 M HCI, 21.9 mL of 12.0 M HCl must be added. The letter A, 21.9 mL, is the right response among the options.

The space consumed within an object's borders in three dimensions is referred to as its volume. It is sometimes referred to as the object's capacity.

The potential of an object is gauged by its dimensions. For instance, a cup's capacity is stated to really be 100 ml if it can accommodate 100 ml of distilled water in its brim. The quantity of volume occupied by a three-dimensional object can also be used to describe volume.

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Therefore, 450.56 g/mol is the molar mass of the unidentified gas.

The average kinetic energy of all gaseous molecules is equal at a given temperature. The lowest mass of these gases, hydrogen gas, will have the highest average velocity. As a result, it will escape the small opening more quickly than the other gases.

The rate of diffusion is the change in molecules that diffuse over time. Inverse to the square root of the volume is the diffusion rate of a gas (density). The formula for rate of diffusion is hence rate of diffusion 1density.

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