The three dienes(red) associated with compound A - C do not react similarly with a dienophile. One diene has a low activation barrier and reacts rapidly; one diene has a high activation barrier and any product formed will be highly reactive; and one diene is inactive. Select the answer that lists dienes A, B, and C from most reactive toward a Diels-Alder reaction to unreactive.

A) c,b,a
B) a,b,c
C) a,c,b
D) b,a,c

Answer:

13.5 g.

Explanation:

76.3 g NH3 contains 4.49 mol NH3. This comes from (3/2)4.49 mol H2 = 6.75 mol H2, or 13.5 g hydrogen.

A main group element has 81 protons and an estimated nuclear charge of +3. Therefor, the element has 84 electrons and can be on in Group 3A of the Periodic Table.

With the atomic number 81 and the chemical symbol Tl, thallium is one of the elements.

When consumed in large quantities, thorium can have negative effects on your nervous system, heart, lungs, liver, and kidney. After being exposed to high levels of thallium for a short time, symptoms like temporary hair loss, vomiting, and diarrhea are possible.

Thallium is regarded as a cumulative poison that can have a negative impact on one's health and cause degenerative changes in numerous organs. The nervous system experiences the most negative effects.

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The  Percent Yield=(Actual YieldTheoretical Yield)×100% = 77.3%

A real yield divided by hypothetical yield multiplied by 100 is known as percent yield.Yield Percentage Equals Actual YieldA theoretical yield of 100%There are various reasons why a chemical reaction's theoretical yield might not match its actual yield, and these will be covered in more detail in later chapters of the course.

Percent yield = Actual Yield/Theoretical Yield x 100 is the formula we use to calculate the yield percentage.

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300.0 ml of 0.10 m CaCl₂ of the following solutions contains the greatest number of ions, assuming all these salts dissociate completely.

An is an atom or collection of atoms where the number of electrons and the number of protons are different. A positive ion, also known as a cation, is a particle that exists when the flow of atoms exceeds the number of protons. Ions are electrically charged particles that are created either by taking electrons out of neutral atoms to make positive ions or adding protons to neutral atoms to produce negative ions. The quantity of protons remains constant during the formation of an ion.

The number of moles in 300. mL of 0.10 M CaCl₂ is:

0.300 L * 0.10 Mol L = 0.030 mol

Each mole of CaCl₂ contains 3 moles of ions (1 Ca²⁺ and 2 Cl⁻). The moles of ions in 0.030 moles of CaCl₂ are:

0.30molNaCl * 3mol Ions / 1 mol NaCl = 0.90 mols

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The density of air at exactly 35°C and 1.00 atm assuming that air is 80.0 percent N₂ and 20.0 percent O₂ is 1.139 g/L

We'll begin by obtaining the average atomic mass of the air. This can be obtained as follow:

Average atomic mass of air = (Molar mass of N₂ × abundance) + (Molar mass of O₂ × abundance)

Average atomic mass of air = (28 × 80%) + (32 × 20%)

Average atomic mass of air = 28.8 amu

Finally, we shall determine the density of the air. This is illustrated below:

Density = PM / RT

Density = (1 × 28.8) / ( 0.0821 × 308)

Density = 1.139 g/L

Thus, the density of the air is 1.139 g/L

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The theoretical yield of the reaction is 1.13 g. The acid H₃PO₄ is the limiting reactant.

Definition of the theoretical yield

The theoretical yield of a given chemical reaction can be obtained from the balanced reaction equation.

Number of moles of Cr =  0.50 g /52 g/mol = 9.6 × 10⁻³ moles

Number of moles of acid =  0.75 g/98 g/mol = 7.7 × 10⁻³ moles

Given that the reaction is 1:1, the limiting reactant would be the acid.

The theoretical yield that is obtained from,

Theoretical yield = Number of moles of product × Molar mass of product

Substitute the values to obtain,

7.7 × 10⁻³ moles × 147 g/mole = 1.13 g

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The classification of given substances is as follows:

Ag is the Atomic element.

F₂ is the Molecular element.

CO is the Molecular compound.

PbI₄ is the Ionic compound.

Crystalline solids are formed by tightly packed ions of opposite charge. Ionic compounds are usually formed when metals react with non-metals. Elements can gain or lose electrons to reach the next noble gas configuration. The formation of ions (by gaining or losing electrons) to complete octets helps them stabilize.

In reactions between metals and nonmetals, metals generally lose electrons to complete octets, while nonmetals gain electrons to complete octets. Metals and non-metals generally.

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Following is the classification of given substances:

An element is a pure substance containing only one type of atom whereas, compound contains more than one kind of atom. Elements are classified by their properties and compounds are classified by the type of bond. Symbols represent elements and compounds are defined by chemical formulas. Their atomic number identifies the elements. Compounds are separated by their atomic ratio. Chemical reactions cannot break-down elements, but they can break down compounds, which is the main difference between compound and element. There are several other factors that distinguish elements from compounds, such as total number, properties, composition, and examples. There are 118 distinct elements in the periodic table. There are countless connections. Elements held the properties of their parent atom. Compounds do not have specific properties and have different properties depending on the type of bond.

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400 meters is equal to approximately 1312.34 feet.

what is the mathematical relation between meter and feet?

The mathematical relationship between meters and feet is based on the conversion factor between these units. The conversion factor is defined as the number of feet per meter, which is approximately 3.2808 feet/meter.

This conversion factor can be used to convert meters to feet by multiplying the number of meters by the conversion factor.

It's important to note that the conversion factor is an approximation, as the exact conversion factor between meters and feet depends on the definition of the meter and the foot. The conversion factor provided here is based on the International System of Units (SI) definitions of these units.

According to the problem:

To convert meters to feet, use the conversion factor 1 meter = 3.2808 feet. To find the equivalent value in feet, multiply the number of meters by the conversion factor.

To convert 400 meters to feet, multiply 400 by 3.2808 to get the following result:

400 meters x 3.2808 feet/meter = 1312.34 feet

So, 400 meters is approximately 1312.34 feet.

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The amount of sugar molecules present in 300mL of a 2.0M solution is 3.61 × 10²³ molecules of sugar.

The number of molecules of a substance can be calculated by multiplying the number of moles in the substance by Avogadro's number (6.02 × 10²³).

According to this question, 300mL of a 2.0M solution is given. The molarity of the solution can be calculated as follows:

no of moles = 0.300 × 2.0 = 0.6moles

no of molecules = 0.6mol × 6.02 × 10²³

no of molecules = 3.61 × 10²³ molecules of sugar.

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In order to produce sp3 hybrid orbitals, 1s atomic orbital(s) and 3p atomic orbital(s) must be mixed.

1 s, 3 p and 1 d orbitals of approximately the same energy intermix to produce sp³ hybrid orbitals and are used to create 5 identical or degenerate hybrid orbitals. These orbitals forms a trigonal bipyramidal symmetry by arranging themselves. In trigonal bipyramidal three orbitals are arranged in a trigonal plane and the other two orbitals are arranged up/down the trigonal plane at right angles.

For example, formation of PCl₅ requires five unpaired electron, the phosphorus atom was excited and one electron from the 3s filled one of the vacant 3d orbitals.

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Answer:

Power plants - sulfur dioxide and nitrogen oxides when they burn fossil fuels, such as coal, to produce electricity.

- The exhaust from cars, trucks, and buses releases nitrogen oxides and sulfur dioxide into the air.

Explanation:

Since oxygen is diatomic in its normal form, it takes two molecules of oxygen to create one molecule of carbon dioxide. The appropriate formula is: C (s) + O2 (g) → CO2 (g).

A mole is 6.02214076 x 1023 of any chemical unit, including atoms, molecules, ions, and others. Given the large number of atoms, compounds, or other components that make up any material, the mole is a useful measure to utilize.

Divide this mass of the substance by its molarity to get how many moles you have. The mass in millimeters of one molecule of a material is known as its molar mass. The atomic unit's atomic weight, expressed in atomic mass units, determines the substance's mass (amu). For instance, one moles of argent has a mass of due to its atomic mass of 107.8682 amu.

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According to the concept of percent yield, the actual yield of magnesium nitrate is 334.41 g.

Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.

In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .

In order to obtain actual yield formula is, actual yield=percent yield×theoretical yield/100

In this case, theoretical yield is , as 24 g magnesium produces 148.3 g magnesium nitrate , 120 g magnesium will produce 741.5 g magnesium nitrate.

∴actual yield=45.10×741.50/100=334.41 g

Thus, the actual yield of magnesium nitrate is 334.41 g.

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91.2 nm is the shortest wavelength line in nanometers in series of the hydrogen spectrum when m=l and n>l

The electromagnetic radiation that a hydrogen electron emits when it transitions from an excited state to a normal state is known as the hydrogen spectrum. The wavelength of the hydrogen spectrum correlates to the energy emitted.

In order to boost electrons to higher energy levels, hydrogen molecules must first be broken into hydrogen atoms (thus the atomic hydrogen emission spectrum). Assume an electron is stimulated to the third energy level. It would probably lose energy once again if it dropped to a lower level.

As we know,

1/λ = R × (z)²× [(1/n₁)² - (1/n₂)²]

Given, it is hydrogen spectrum thus z = 1

and R = 1.097 × 10⁷ m⁻¹

n₁ = 1 and n₂ = ∞

Now,

or, 1/λ = (1.097 × 10⁷ m⁻¹) × (1)²× [(1/1)² - (1/∞)²]

or, 1/λ = 1.097 × 10⁷ m⁻¹

or, λ = 1/ 1.097 × 10⁷ m⁻¹

λ = 91.2 nm

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Option c) is  correct . The cuvette will not be same as last week or spectrophotometer may give different results on different days.

What is calibration plot?

This curve is used in analytical chemistry for the determination the concentration of an unknown sample solution.

Some errors might get during measurements

1. didn't wait for instrument to calibrate. (Before showing 0.00 have placed cuvette in it)

2. Not handled the cuvette in correct way.

3. May changed the cuvette. (Size of cuvette)

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Aluminium cannot replace potassium because potassium is more reactive than aluminium. And the response won't take place.

What is Displacement Reaction?

Chemistry's most crucial chemical reactions are displacement reactions. They are applied in a variety of settings and contexts. For instance, electroplating, which is based on displacement reaction, is used to stop iron objects from rusting.

Displacement reactions are those in which a portion of one reactant is replaced by another reactant. Another name for it is a replacement reaction. as another reactant ion takes the place of one ion that was previously present.

For instance, Fe+CuSO4FeSO4+Cu

One element is replaced by another in a compound in a single displacement reaction, which is also known as a single replacement reaction.

Chlorine takes the place of bromine when it is introduced to a solution of sodium bromide in gaseous form (or as a gas dissolved in water). Chlorine, which is more reactive than bromine, causes sodium bromide to lose bromine, which causes the solutions to turn blue. The bromine that is displaced gives the colour brown. The Cl and Br have been switched around in the equation, as can be seen.

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Solid lithium reacts with dinitrogen giving lithium nitride. Where three electrons from lithium is transferred to nitrogen. The balanced chemical equation is given below:

[tex]\rm 6 Li (s) + N_{2} (g) \rightarrow 2 Li_{3}N (s)[/tex]

Lithium nitride is a brownish-red  colored powder compound formed by the ionic bonding between lithium and nitrogen. Lithium is an alkali metal with 3 electrons with one valence electron.

Nitrogen is a non-metal with 5 valence electron and it needs 3 more electrons to achieve octet. Thus, lithium gives its valence electron to nitrogen. One nitrogen needs 3 electrons thus two nitrogen needs total 6 electrons. Thus two nitrogen atoms bonds with 6 Li atoms as written in the balanced reaction.

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Answer: It is easier to remember the properties of an element if its position in the periodic table is known.

Explanation:

The formation of the sodium chloride would occur when one electron moves from sodium to chlorine.

We know that a compound is ionic because the compound can be formed by the combination of a metal and a non metal when this occurs, there would be the transfer of an electron from a metal to a non metal. The implication of this is that we would have a pair of ions. On ion would be positively charged and the other ion would be negatively charged.

In the case of the chlorine and the sodium atoms, the compound that is formed here is sodium chloride. The only electron that is found in the outermost shell of sodium atom would be removed and then the chlorine atom would now be seen to have a full shell.

Thus in the formation of the ionic compound, there is a transfer of electrons from sodium to chlorine.

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Semipermeable membranes are a type of polymeric, biological or synthetic membrane that permits certain ions or molecules to flow through them via osmosis.

A thin membrane known as a semipermeable membrane allows certain tiny molecules to flow through but not others. A semipermeable membrane can be a small piece of cellophane.

Semi implies some or a small amount, and permeable means able to let anything through. Consequently, a semi-permeable screen is one that only permits specific substances to flow through. Different from membrane pores, which let all materials flow through the barrier, are semi-permeable membranes.

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According  to the molecular geometry, there are 3  maximum number of σ bonds that the atom can form and 2 maximum number of p-p bonds that the atom can form .

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

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According to the given statement Hb is removed because it is anti-periplanar to the leaving group.

Stereochemistry is the scientific study of a substance's three-dimensional structure. The location of the material's electrons in three dimensions is the only structural distinction between the stereoisomers cross & trans analogues, which are kinds. There may be differences in the chemical and physical properties of these stereoisomers.

The word "stereochemistry," which relates to physics in three dimensions, comes from the Greek word "stereos," which means solid. Stereochemistry cannot be regarded as a field of chemistry because almost all organic molecules are three-dimensional (with the possible exception of some olefins and aromatics, which will be covered later).

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Considering the definition of enthalpy of reaction, the enthalpy change for the reaction is 650 kJ.

The enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.

In this case you want to calculate the enthalpy change of:

5 H₂SO₄ → 5 SO₃ + 5 H₂O

You know the following reaction, with his corresponding enthalpie:

SO₃ + H₂O → H₂SO₄     ΔH = –130 kJ

To obtain the enthalpy of the desired chemical reaction you need 5 moles of H₂SO₄ on reactant side. The given equation has 1 mole of H₂SO₄ on the product side, soit is necessary to locate it on the reactant side (invert it) and multiply it by 5.

When an equation is inverted, the sign of delta H also changes. And since enthalpy is an extensive property, that is, it depends on the amount of matter present, since the equation is multiply by 2, the variation of enthalpy also.

In summary, you know that the enthalpy change is 650 kJ.

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Option A, B and D are chemical changes and Option C is a physical changes

Physical and Chemical changes:

Hence, Option A, B and D are chemical changes and Option C is a physical changes

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The oxidative decarboxylation of -ketoglutarate to succinyl coenzyme A is catalyzed by the -ketoglutarate dehydrogenase complex (ODHC) (succinyl-CoA).

A tightly controlled enzyme called alpha-ketoglutarate dehydrogenase (-KGDH) may control the metabolic flow through the Krebs cycle. It directly creates NADH and catalyzes the conversion of -ketoglutarate to succinyl-CoA, supplying the respiratory chain with electrons.

The -ketoglutarate dehydrogenase complex does not have a sophisticated regulation system comprising a kinase and a phosphatase, in contrast to the pyruvate dehydrogenase complex. High ratios of ATP/ADP, succinyl-CoA/CoASH, and NADH/NAD+, on the other hand, inhibit activity while Ca2+ stimulates it.

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Will the flask explode if the pressure is less than 3 atm if it can tolerate pressures up to that level.

To create the proteins found in your muscles, skin, blood, hair, nails, and DNA, your body needs nitrogen. According the Royal Society of Chemistry, your diet's protein-containing foods are where you get your nitrogen. Meat, fish, beans, nuts, eggs, milk, and other dairy items are some of these foods. Nitrogen exposure is hazardous because it can displace oxygen and induce asphyxia.

The formula below is used to determine the pressure at a given temperature for a given volume of nitrogen gas:

P₁/T₁ = P₂/T₂

where;

Initial pressure is P1.

Initial temperature is T1.

Final pressure is P2.

T2 is the final temperature.

P2 solution

P₂ = P₁ * T₂ / T₁

P₂ = 0.836 * (680 + 273) / (20 + 273)

P₂ = 2.72 atm =3atm

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There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, blanks can be filled with the knowledge of types of chemical compound.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. Covalent compounds are formed by elements whose electronegativity difference is null. These compounds have low melting and boiling point.

Therefore, blanks can be filled with the knowledge of types of chemical compound.

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The volume of 0.240 M KOH to react completely with 11.4 ml of 0.110 M sulphuric acid is 5.225 ml.

Molarity of a solution is the ratio of the number moles of solutes to the volume of solution in liters. Molarity is most common term used to express the concentration of a solution.

Let the volume and molarity of the titrant be V1 and M1 respectively and the volume of molarity of the analyte be V2 and M2 then,

M1 V1 = M2 V2.

Given volume of H₂SO₄  = 11.4 ml

Molarity = 0.11 M

Molarity of KOH = 0.24 M

volume of KOH = (11.4 ml × 0.11 M) / 0.24 M

                          = 5.225 ml.

Therefore, the volume of KOH needed for the titration is 5.2 ml.

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