PLEASE HELP I ACTUALLY WANT TO LEARN THIS PROBLEM!!! 125 g Fe₂O3 reacts according to the equation below. Calculate the % yield if
87,000 milligrams of iron are formed?
Fe₂O3 +
C →
125g Fez03x
Fe +
CO

The correct order of reactivity towards electrophilic aromatic substitution is:

b.) Phenol > benzene > chlorobenzene > benzoic acid

Phenol is more reactive than benzene towards electrophilic substitution reactions due to the presence of the -OH group (hydroxyl group) attached to the benzene ring. The lone pair of electrons on the oxygen atom in the -OH group can donate electron density to the ring, making it more nucleophilic and facilitating electrophilic attack.

Benzene, although less reactive than phenol, can still undergo electrophilic substitution reactions due to its aromaticity and delocalized electron system.

Chlorobenzene is less reactive than both phenol and benzene because the chlorine atom is an electron-withdrawing group. It withdraws electron density from the benzene ring, making it less nucleophilic and less prone to electrophilic substitution.

Benzoic acid is the least reactive among the options given. The carboxylic acid group (-COOH) is an even stronger electron-withdrawing group than the chlorine atom in chlorobenzene. It further reduces the electron density on the benzene ring, decreasing its reactivity towards electrophilic substitution.

Therefore, the correct order of reactivity towards electrophilic substitution is option b.

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the complete question is:

The correct order of reactivity towards electrophilic aromatic substitution is?

a.) Benzene > phenol > benzoic acid > chlorobenzene

b.) Phenol > benzene > chlorobenzene > benzoic acid

c.) Chlorobenzene > benzoic acid > phenol > benzene

d.) Benzoic acid > chlorobenzene > benzene > phenol

Answer:

a) Acidified potassium dichromate solution is used to test for the presence of a primary or secondary alcohol.

b) The orange color of the potassium dichromate solution is reduced to green when it reacts with an alcohol.

c) The oxidation of a primary alcohol produces a carboxylic acid.

d) The oxidation of a secondary alcohol produces a ketone.

e) The dichromate test does not work for tertiary alcohols because they cannot be further oxidized. Methylpropan-2-ol is a tertiary alcohol with the chemical structure:

CH3

|

CH3—C—OH

|

CH3

Since there are no hydrogen atoms attached to the carbon atom bearing the hydroxyl group, it cannot be oxidized.

a) A simple test for the presence of a carboxylic acid group is the addition of sodium hydrogencarbonate solution to the compound. The reagent reacts with the carboxylic acid to produce carbon dioxide gas.

Reagent: Sodium hydrogencarbonate solution

Observation: Effervescence (bubbling) due to the release of carbon dioxide gas.

b) To confirm that the gas produced in the hydrogencarbonate test is carbon dioxide, it can be tested with limewater. Carbon dioxide turns limewater milky/cloudy due to the formation of calcium carbonate.

c) The hydrogencarbonate test is not conclusive proof that a carboxylic acid group is present in a completely unknown compound because some other functional groups such as phenols and alcohols can also react with the reagent and produce carbon dioxide. Therefore, additional tests such as the dichromate test or Tollens' test may be needed to confirm the presence of a carboxylic acid group.

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Answer: Other characteristics of the noble gases are that they all conduct electricity, fluoresce, are odorless and colorless, and are used in many conditions when a stable element is needed to maintain a safe and constant environment. This chemical series contains helium, neon, argon, krypton, xenon, and radon.

Answer:

to collect measurable, empirical evidence in an experiment related to a hypothesis the results aiming to support or contradict a theory.

Explanation:

Answer:

yes

Explanation:

I would get colder the more ice you put in it

Simply transfer the cold plate/processors to the new system board; there is no need to remove the processor or disrupt the thermal material bond from the cold plate.

A cold-water conduit into your CPU is only one form of liquid cooling; there are a few others as well. Some server cabinets have chilled rear doors where cool air is pushed onto the server and cold water is piped through.

Microsoft is one of the IT corporations working with cold plate technology, which uses pipes of liquid to cool servers through metal plates. By employing it to cool the chips that record digital currency transactions, participants in the cryptocurrency business invented liquid immersion cooling for computing hardware.

The water block's coolant absorbs the heat from the CPU. To keep the processor or graphics card cold, a cooling liquid is known as coolant loops around the cooling kit. To remove air bubbles from the liquid as it circulates, the reservoir stores extra coolant.

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If guanine makes up 30% of the bases in a DNA double helix, then adenine would make up 20% of the bases.

A nitrogenous base is a nucleobase or nitrogen-containing molecule that is a fundamental component of nucleic acids. They are also known as nucleotide bases. DNA and RNA are two types of nucleic acids. There are two types of nitrogenous bases: purines and pyrimidines. Adenine and guanine are purines, while cytosine, thymine, and uracil are pyrimidines.

Adenine is present in the same number as thymine in the DNA, and guanine is present in the same number as cytosine. Thus, the total percentage of guanine + cytosine = 100 - 30 = 70%. Adenine and thymine make up the other 70 percent, which is 35 percent each. Since guanine makes up 30% of the bases in a DNA double helix, it leaves 70% for adenine and thymine. As a result, adenine makes up half of the remaining 70% which is 35%.

As a result, if guanine constitutes 30% of the bases in a double helix DNA, adenine constitutes 20% of the bases.

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Explanation:

The ice melting would make more water because ice is water and if it melts it make water.

hope this helps :)

Answer:

a duck diving into a lake

Explanation:

Biotic factors are living or once living organisms in the ecosystem. These are obtained from the biosphere and are capable of reproduction.

Abiotic factors are non-living physical or chemical elements in the ecosystem. Examples include: water, air, soil, sunlight, and minerals.

Answer:

alkali metals

Explanation:

alkali metals are in group 1 (the first column of elements) indicating they have 1 valence electron. halogens are in group 17 and they have 7 valence electrons.

Answer:

A.. Alkali metals

Explanation:

took the quiz

The reaction that is occurring in this question is:

H2 + I2 -> 2 HI

As we can see, the molar ratio for H2 and I2 is 1:1, one mole of H2 for each mole of I2, and the molar ratio between any reactant and HI is 1:2, which means the number of moles of product will be two times more than the number of moles of the reactants

We have:

3.0 moles of H2

2.0 moles of I2

1.0 moles of HI

According to the molar ratio, we should have the name number of moles of I2 and H2, which means that H2 is in excess and I2 is the limiting reactant with 2 moles

If we have 2 moles of I2, and the molar ratio of I2 and HI is 1:2, we should have 4 moles of HI being produced

Therefore the theoretical number of moles is 4.0 moles of HI from 2.0 moles of I2

Answer: Fluorine

Explanation:

The answer is fluorine as it is in the 9th

Answer:

mass of iron in grams  = 1.493×\(10^{-23}\) g

Explanation:

Since one mole of anything is equal to 6.022×\(10^{23}\) of that thing, we can apply that to atoms as well. 1 mol of iron = 55.85g. i.e. the molar mass of iron = 55.85g/mol.

To find the number of moles present, we can divide the number of atoms by the number of atoms in 1 mole, i.e Avogadro's Constant (6.022×\(10^{23}\)).

\(\frac{N}{N_{A}} = n\)

∴ n(Fe) = 502/6.022×\(10^{23}\) = 8.3361×\(10^{-22}\) mol of iron

Finally, to find the mass of iron present, we can divide the number of moles by the molar mass.

\(\frac{n}{M}} = m\)

∴ m(Fe) = 8.3361×\(10^{-22}\)/55.85 = 1.493×\(10^{-23}\) g. (4 sig. fig.)

Answer:

dddddddddddddd

ddddddddddddddddd

Answer:

The answer is 27

Explanation:

An aluminum isotope consists of 13 protons, 16 neutrons, and 13 neutrons. Its mass number is 27. Therefore, option C is correct.

The term isotope is defined as atoms with the same number of protons but different numbers of neutrons. They have similar chemical properties, but they are differ in mass number and physical properties.

Example of isotope is carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon they have same atomic number but differ in mass numbers that is 12, 13 and 14.

Aluminium (Al) has multiple isotopes. Only 27Al is stable isotope and 26Al is radioactive isotope.An aluminum isotope consists of 13 protons, 16 neutrons, and 13 neutrons. Its mass number is 27.

Thus, option C is correct.

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Answer:

Color Change.

Production of an odor.

Change of Temperature.

Evolution of a gas (bubbles)

Precipitate (formation of a solid)  

There are 5 so you can choose 4.

The four signs that a chemical reaction has occurred are as follows:

A chemical reaction may be defined as a process that significantly involves the chemical transformation of one set of chemical substances to another. This process involves the utilization of substances known as reactants that are transformed into other substances known as products.

Every chemical reaction involves the four signs which are mentioned above. These signs are delivered by chemical reactions along with determined products. But the mass of the reactants and products always remains the same. Precipitation is only visualized in specific reactions with the possessions of certain characteristics.

Therefore, the four signs that a chemical reaction has occurred are well-mentioned above.

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The anion radius between a divalent cation and a divalent anion (the force 2.53 x 10⁻⁸ N) = 0.097 nm.

The force of attraction between the cation and anion can be calculated using Coulomb's law:

F = kq₁q₂/r²

Where

F is the force of attraction

k is Coulomb's constant

q₁ and q₂ are the charges on the cation and anion, respectively, and

r is the distance between the centers of the cation and anion.

We are given the force of attraction, the charge on the cation and anion, and the ionic radius of the cation.

We can rearrange the equation to solve for the distance between the centers of the cation and anion:

r = \(\sqrt{\frac{kq1kq2}{F} }\)

We can then subtract the ionic radius of the cation from the distance between the centers of the cation and anion to find the ionic radius of the anion:

rₐ = r - rₑ = \(\sqrt{\frac{kq1kq2}{F} }\) - rₑ

Plugging in the given values:

rₐ =

√\(\sqrt{\frac{((8.99) (10^{9})(2)(2)}{(2.53(10^{-8})-(0.074(10^{-9})  } }\)  

= 0.097 nm

Therefore, the anion radius is 0.097 nm.

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Answer:

Lithium sulfide

Answer:

MnO2 M n O 2 is an ionic substance without any oxo-anions, therefore its name has the -ide ending.

Answer:

The order of the reaction with respect to D is 2, and the order with respect to G is 1.

Explanation:

To determine the order of a reaction with respect to each reactant, we look at how changing the concentration of a reactant changes the rate of the reaction.

Looking at the initial concentrations and rates for D in experiments 1 and 2, when the concentration of D is doubled (from 0.025 to 0.050), the rate of reaction quadruples (from 0.00480 to 0.0192). This indicates that the order of the reaction with respect to D is 2, because the rate of reaction changes by the square of the change in concentration.

Next, we look at the initial concentrations and rates for G in experiments 3 and 4. In these experiments, when the concentration of G is quadrupled (from 0.020 to 0.080), the rate of the reaction also quadruples (from 0.0986 to 0.394). This indicates that the order of the reaction with respect to G is 1, because the rate of reaction changes directly with the change in concentration.

So, the order of the reaction with respect to D is 2, and the order with respect to G is 1.

Answer:

Thus, we can say that the element is calcium. This can be clearly understood as ionic compounds have high melting and boiling points in general such as calcium oxide.

Answer:

The element is Calcium I guess.

Explanation:

Cause calcium oxide has high melting point and is soluble in water.

Answer:

Carbondioxide, water and ATP

Explanation:

The reaction is called aerobic respiration because oxygen from the air is needed for it to work.

Answer:

What do we need to find in that question ?

Answer:

1) no

2)yes

3)no

4)yes

Explanation:

hope that it helped you

Answer:

Since I was not present in your lesson, I can only guess your vocabulary words. I am guessing consistency though.

The balanced chemical equations are as  follows:

14. C₂H₄ + 3 O₂ -> 2CO₂ + 2H₂O

15. 2NaHCO₃ -> Na₂CO₃ + H₂O + CO₂

16. 3Cl₂ + 2NaBr -> 2NaCl + Br₂

17. 3Na₂S + 2NaCl + 3H₂O -> 5NaCl + H₂S + 3O₂

Balanced equations are equations of chemical reactions that ensure that the law of conservation of mass is true.

In a balanced equation, the number of atoms of each element on both sides of the equation is equal.

The given chemical equations are balanced as follows;

14.  Place 3, 2, and 2 before O₂, CO₂, and H₂O respectively.

C₂H₄ + 3 O₂ -> 2 CO₂ + 2 H₂O

15. Place 2 in front of NaHCO₃.

2 NaHCO₃ -> Na₂CO₃ + H₂O + CO₂

16. Place 3, 2, and 2 in front of Cl₂, NaBr, and NaCl respectively.

3Cl₂ + 2NaBr -> 2NaCl + Br₂

17. Place 3, 2, 3, 5, and 3 in front of Na₂S, NaCl, H₂O, NaCl, and O₂ respectively.

3Na₂S + 2NaCl + 3H₂O -> 5NaCl + H₂S + 3O₂

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It is believed that tectonic plates move as a result of convection in the asthenosphere and gravity.

According to the widely recognized scientific hypothesis known as plate tectonics, the Earth's lithosphere is made up of many sizable tectonic plates that have been steadily moving for nearly 3.4 billion years.

A tectonic plate, also known as a lithospheric plate, is a sizable slab of solid rock with an uneven shape that is typically made up of both continental and oceanic lithosphere. The Pacific and Antarctic Plates are among the largest plates, but they can range in size from a few hundred to thousands of kilometers broad.

Thus, it follows that convection in the asthenosphere and gravity are thought to be the causes of tectonic plate movement.

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The spectrophotometer was used to measure the amount of light absorbed by the solution, which was proportional to the quantity of concentration present in the solution.

At specific light wavelengths, a spectrophotometer accurately measures electromagnetic energy. Using the characteristics of light and energy, it distinguishes between colours and determines how much of each color is included in a ray of light.

Measure the object's spectral reflectance before using a UV-VIS spectrophotometer to measure color. The color is expressed as a numeric number using calculations based on the spectral distribution of the illumination, the object's measured spectral reflectance, and the color-matching function.

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The amount of liquid phase in 1 kg of the alloy can be calculated by using the lever rule. The lever rule states that the amount of each phase at equilibrium is equal to the molar fraction of the phase multiplied by the total mass of alloy present.

Therefore, in 1 kg of the alloy, the amount of liquid phase present is equal to (46/50) kg = 0.92 kg.

The lever rule is based on the concept of chemical potentials. When the alloy is heated, the chemical potential of the components in the liquid and solid phases change until they become equal. At this point, the composition of the solid and liquid phases are in equilibrium and the lever rule can be used to determine the amount of each phase present. The amount of liquid phase present is directly dependent on the composition of the alloy, with more liquid present as the composition approaches the liquid composition.

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