The arrow in a chemical equation means _______

A. Sum
B. Produces
C. Diffrence

The answer is 87%.

Solution:

Number of moles of MgCl2 = Volume* Molarity

nMgCl2 = 0.114*0.192= 0.021888 moles

Similarly, nNaOH = 0.02564*0.613= 0.015 moles

Now, according to the reaction, 1 mole of MgCl2 will react with 2 moles of NaOH to produce 1 mole of Mg(OH)2 and 2 moles of NaCl

Thus 0.021888  moles of MgCl2 will react with 0.021888*2 = 0.043776 moles of NaOH which is less than 0.015.

Hence NaOH will be the limiting reagent and will get totally consumed.

Now, according to the equation, 2 moles of NaOH corresponds to 1 mole of Mg(OH)2.

Thus the number of moles of Mg(OH)2 actually produced in the reaction is 0.015/2 = 0.007 moles

Mass of Mg(OH)2 that should have been produced produced = 0.007*58 = 0.406 gm

But actual mass-produced = 0.357 gm

Yield percent = (0.357*100)/0.406 = 87%

Aqueous solutions of magnesium chloride and sodium hydroxide react to form solid magnesium hydroxide and aqueous sodium chloride. This is a neutralization reaction, also called a double displacement reaction. This is a neutralization because you added the base magnesium hydroxide to the acid HCl. The products are salt and water.

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Answer:

It consist of glucose. To be specific, it had two molecules of glucose known as benzaldehyde and hydrocyanic acid.

Explanation:

Amygdalin is a white, bitter-tasting, water-soluble, glyosidic power, C20H27NO11, usually obtained from bitter almond seeds and the leaves of plants of the genus Prunus and related genera: used chiefly in medicine as an expectorant.  

Now let's go onto the others.

Glucose is a sugar, C6H12O6, having several optically different forms, the common dextrorotatory form (dextroglucose, or -glucose) occurring in many fruits, animal tissues and fluids, etc., and having a sweetness about one half that of ordinary sugar, and the rare levorotatory from (laevoglucose, or -glucose) not naturally occurring.

The benzaldehyde molecule contains a total of 14 atom(s). There are 6 Hydrogen atom(s), 7 Carbon atom(s) and 1 Oxygen atom(s) A chemical formula of benzaldehyde can therefore be written as:C7H6O.

A solution of hydrogen cyanide in water, represented as HCN, is called hydrocyanic acid. Hydrogen cyanide is a colorless, poisonous bas, HCN, having a bitter almond like odor: in aqueous solution it forms hydrocyanic acid.

Thank you,

Eddie

The Lewis structure of SiF₅ shows that there are 5 single bonds in the compound with no double bonds and the central silicon atom expands the octet since it is bonded with 9 electrons.

Silicon penta fluoride SiF₅ is a covalent compound formed by the sharing of electrons between silicon and fluorine. Silicon is 14th element and it have 4 valence electrons. Thus, it need 4 more electrons to attain octet.

Fluorine is 17th element  containing 7 valence electrons. Thus it needs 1 electron to attain octet. Each F shares their one valence electrons with silicon and Si thus exceeds octet by receiving 9 electrons. All the 5 bonds are single bonds.

The one extra pair of electron make the charge on the central atom. Thus the compound does not obey octet rule.

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Answer:

[tex]\text{NO}_2^{-}[/tex]

Explanation:

A conjugate base is formed when a proton is removed from an acid.

So, the conjugate base of [tex]\text{HNO}_2[/tex] is [tex]\text{NO}_2^{-}[/tex].

All tissues consist of two main components: cells and extracellular matrix, consisting of a gelatinous substance called ground substance and numerous different protein fibers.

The statements that are true are, Ni has 2 unpaired electrons in its 3d orbitals, and in the building up of atoms, electrons occupy the 4f orbitals before the 6s orbitals.

The 3d orbitals of Ni are the five orbitals of the d-subshell, which have the following shapes: 3dxy, 3dxz, 3dyz, 3dx2-y2, and 3dz2. These orbitals are able to hold a maximum of ten electrons, and Ni has eight electrons in its 3d orbitals. Of the eight electrons, two of them are unpaired.

The first unpaired electron is in the 3dxy orbital. This orbital is a degenerate orbital, which means it can hold two electrons with opposite spins. When Ni has two electrons in the 3dxy orbital, one of them will have an up spin and the other will have a down spin, meaning they can occupy the same orbital without having to repel each other.

The second unpaired electron is in the 3dx2-y2 orbital. This orbital is also a degenerate orbital, which means it can hold two electrons with opposite spins. When Ni has two electrons in the 3dx2-y2 orbital, one of them will have an up spin and the other will have a down spin, meaning they can occupy the same orbital without having to repel each other.

In the second statement 4f orbitals are filled before the 6s orbitals due to the fact that the 4f orbitals have lower energy than the 6s orbitals. This means that electrons will fill the 4f orbitals first as they are closer to the nucleus and therefore have lower energy. The 6s orbitals are further away from the nucleus and therefore have higher energy than the 4f orbitals. This means that the electrons will fill the 4f orbitals before they fill the 6s orbitals.

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The total solidification time is the time required for the casting to solidify after pouring. This time is dependent on the size and shape of the casting by an empirical relationship known as Chvorinov's rule.

What is casting process?
This example is a model of a continuous casting process. Liquid metal is poured into a mold of uniform cross section. The outside of the mold is cooled and the metal solidifies as it flows through. When the metal leaves the mold, it is completely solidified on the outside, but still liquid inside. The metal will continue to cool and eventually solidify completely, at which point it can be cut into sections. This model is simplified somewhat by not computing the flow field of the liquid metal, it is assumed that the velocity of the metal is constant throughout. The phase transition from molten to solid state is modeled via a temperature dependent specific heat. Issues of convergence and mesh refinement are addressed for this highly nonlinear model.

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Well, animal cells are unique. Like human cells, animal cells serve as the building blocks for the Animalia kingdom along with the organisms within it. Animal cells absorb nutrients and provide energy, form a structure for the organism, and generally help an animal function correctly and move. They can replicate themselves as they contain all the hereditary material of a living organism. But overall, a animal cell is a type of cell known as a eukaryotic cell in which it lacks a actual cell wall along with a genuine, membrane-bound nucleus that consists of other cellular organelles too.

The animal cell consists of the nucleus, cell membrane, mitochondria and cytoplasm -- these 4 cell components can also be found in plant cells.

More information:

Well, “animal cells” are legitimately cells from an animal.  They are cells that belong to the same class as "animals," but each one of them may be unique and serve a distinct purpose. The absence of a cell wall and chloroplasts makes them easily distinguishable from plant cells.

animal cell is a really big range of cells, so I’m going to share a few common ones here:

(1) Stem cells are crucial cells that can develop into many types of cells in the human body. They are located in the umbilical cord, where stem cells begin to differentiate into many types of cells with various roles in the developing baby' body.

(2) Red blood cells are a unique class of cells that lack a nucleus, making them targets for the spleen's destruction and breakdown into iron and bile pigments. It has hemoglobin, which binds to oxygen to create oxyhemoglobin, which then carries oxygen to every cell in the body.

(3) White blood cells: These immune system-supporting cells work to protect the body when foreign antigens are ingested. Phagocytes and lymphocytes are the two primary subgroups of white blood cells. While lymphocytes create antibodies and interact with other immune cells, phagocytes primarily ingest foreign particles through a process known as phagocytosis.

(4) Muscle cells are, of all, what allow animals to move about. They contract and relax with the bones to let the bodily component to move. Given that a body is made up of several muscle cells, this truly covers a large spectrum of cells.

Thanks.

The correct name of the compound is dinitrogen pentoxide.

We know that we can be able to name a compound from the formula of the compound. This is the whole essence of the IUPAC nomenclature. The International Union of Pure and Applied Chemistry put forward some standard rules  that can be applied when we are naming a compound.

We can see here that we have two atoms of nitrogen and five atoms of oxygen in the compound and this would have to reflect as we name the compound and this also as we can see do  derive directly from the molecular formula of the compound.

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Acids include hydrochloric acid (HCl) and bases include sodium hydroxide (NaOH). As a result, when they combine, they have a neutralization reaction that produces water and sodium chloride.

The pH rises to about 7 as a result of neutralization, which happens when a base and a base combine. It is a useful technique that is applied in daily life, for example when lime is added to acid soils to treat and relieve indigestion. Furthermore, neutralization results in an alkali's pH dropping to about seven.

Taking a base balances out our stomach's excess acid. Due to the formic acid in the ant sting, it can be painful. Using wet baking soda, which really is basic in nature, we can counteract this acid impact and lessen the agony brought on by the sting.

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The equation to use Hfusion to calculate the energy needed to melt a mass of solid is Grams solid × mol/g × H fusion

what is Hfusion?

The heat of fusion is the amount of heat required to turn 1 g of solid into a liquid without causing a change in temperature.

1Kg×1/H fusion ×g/mol solid

Numerous everyday household products have been produced using the heat of fusion technique, which has numerous other uses. Melting ice into water is the most typical application of the heat of fusion. Manufacturing is where you'll find the great majority of instances of heat of fusion in use. The following examples have been in use for many centuries and are still refined today. Heat of fusion is a necessary step in the production of things such as coins, glass, forged metal, and household goods made from blow-molded plastic.

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From the electronic configuration, the element which is similar in chemical behavior to the undiscovered element 170 is beryllium(Be).

Beryllium(Be) is a fourth element in the periodic table and it has fulfilled s-orbitals with two electrons. The electronic configuration of an element with electron number 170 also ends up with all of the s-orbitals filled up. So, the electronic configuration is similar to the beryllium(Be) element, which is alkaline earth metal. It means that 170th element is also an alkaline earth metal, which form hydroxides.

Therefore, from the electronic configuration, the element which is similar in chemical behavior to the undiscovered element 170 is beryllium(Be).

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Carbon is the sample atom, and its electron configuration is 1s2 2s2 2p2.

what is an electronic configuration ?

The shellp in which an electron is situated relative to the atom's nucleus is referred to as the electron's primary energy level. A carbon atom has only two energy levels in this case, which are energy levels 1 and 2.

Sublevels exist within a principal energy, and the electron configuration of an atom is described by taking energy sublevels into account. A carbon atom's sublevels are as follows:

Sublevels of energy s and p

The orbitals in this configuration are as follows: 1s 2s 2px 2py 2pz, where each orbital can hold two electrons.

Finally, the periodic table position of an element with regard to group and period is utilised.

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Hydrogen bonding is an example of intermolecular forces (Option 1, question 1).  The strongest intermolecular forces present in a sample of Hypofluorous acid HOF are hydrogen bonds (Option 1, question 2).

Intermolecular forces can be defined as forces that link atoms in a molecule and maintain them in a connected way such as occurs with hydrogen bonds which are weaker than covalent and or ionic bonds.

Therefore, with this data, we can see that intermolecular forces are based on the interaction between atoms in a given molecule and hydrogen bonds are a type of intermolecular force.

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The answer is 7-chloro-3-ethyl-4-methyl-3-heptene.

We start the numbering from the side from which the double bond will come under the lowest combination. So if we start from the top left side, the double bond starts at the 3rd position. If we start numbering at the chlorine side, then the double bond comes at the 4th position. Now we identify the longest chain.

The longest chain would be from the top left corner to the top right corner. There will be 7 carbon atoms in the chain. Then after numbering, we identify the substituents. The substituents will be ethyl, methyl, and chlorine at 3,4, and 7 positions respectively. The naming is done alphabetically.

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The molar solubility of SrF₂ in 1.3 x 10⁻² M of NaF is = 2.544 x 10⁻⁵ M

The primary distinction between molar solubility and product solubility constant is that the former refers to the rate of dissolution of a substance per liter of a solution, while the latter refers to the dissolving of a solid in an aqueous solution.

We have, Ksp expression for the SrF₂ = 4.3×10⁻⁹

Ksp = [Sr²⁺] [F⁻]²

4.3 x 10⁻⁹ = (x) × (1.3 x 10⁻²)²

or, x = (4.3 x 10⁻⁹) / (1.3 x10⁻²)² M

or, x = 2.544 x 10⁻⁵ M

Molar solubility of SrF₂ in 1.3 x 10⁻² M of NaF is = 2.544 x 10⁻⁵ M.

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Cindy's proposal is unsolicited, the indirect approach.

The inquiry method is characterized as a scholar-centered technique, this is, through this methodology the pupil is capable of constructing their personal way of studying. In this way, the scholar can expand hypotheses, talk with colleagues, and argue standards thru realistic experimental activities.

Inexperienced solvents are environmentally pleasant solvents, or bio solvents, which can be derived from the processing of agricultural crops. Using petrochemical solvents is the key to most people of chemical procedures but now not without intense implications on the environment.

Conceptual techniques: mastering through experience. Gaining knowledge through summary conceptualization by developing techniques and theories. Studying via lively experimentation. Learning via reflective commentary.

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The skeletal rearrangement of the forma- tion of epoxide 2 from bromohydrin 1.

Skeletal rearrangement reactions, which contain a exchange of connectivity of the substrate thru cleavage of carbon-carbon, carbon-heteroatom, and heteroatom-heteroatom bonds, have attracted plenty interest as a synthetic method of highly substituted organic.

Intermediate is a 3-membered ring (halonium ion). Halohydrin formation (specifically chlorohydrin and bromohydrin formation) is the end result of the addition of a halogen (Cl or Br--less substituted side) and a hydroxyl institution (greater substituted aspect) across an alkene.

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Metallic bonding is described as a type of chemical bonding that arises from the electrostatic attractive force between conduction electrons and positively charged metal ions.

The strength of metallic bonding can be measured via the metal's enthalpy of vaporization.

The enthalpy of vaporization is described as the heat required to vaporize a material at constant pressure.

Metallic bonding is often described as an array of positive ions in a sea of electrons in which the metal is held together by the strong forces of attraction between the delocalized electrons and the positive ions.

The properties of metals that are a consequence of metallic bonding include:

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Answer: 0.2 g

Explanation:

13.929484 g is the mass in  grams of calcium hydroxide will be needed to react completely with 18.52 grams of sulfuric acid.

Sulfuric acid, also known as sulphuric acid or oil of vitriol in the past, is a mineral acid made up of the elements hydrogen, oxygen, and sulfur with the chemical formula H2SO4. It is a viscous liquid that is miscible with water. It has no color or smell.

Ca(OH)2+H2SO4→2H2O + CaSO4

1 mol Ca(OH)2 react with 1 mol H2SO4

molar mass of Ca(OH)2 =74.093 g/mol

molar mass of  H2SO4=98.079 g/mol

⇒mol of H2SO4 in 18.52 grams=

⇒ 18.52/98.079 =0.188 mol H2SO4

So, 0.188 mol H2SO4

molar mass Ca(OH)2 =74.093 g/mol

Mass of  0.188 mol H2SO4= 0.188*74.093 g/mol=13.929484 g

13.929484 g is the mass in  grams of calcium hydroxide will be needed to react completely with 18.52 grams of sulfuric acid.

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In order to secure reliable sources of rubber, tin, rice, scrap iron and liquid fuel, japan decided it must both seize much of southeast asia and attack united states pacific bases in hawaii and elsewhere

When first created, natural rubber, also known as caoutchouc or India rubber, is made of polymers of the organic compound isoprene, along with water and trace amounts of other organic compounds. The top two producers of rubber are Thailand and Indonesia. Elastomers are a category for different types of polyisoprene that are used as natural rubbers. At the moment, rubber is mostly obtained from rubber trees or other sources as latex. Making incisions in the bark and collecting the fluid in vessels is a process known as "tapping," which removes the latex, a sticky, milky colloid. The rubber created from the refined latex is then ready for industrial processing. Latex is allowed to coagulate in the collection cup in major areas.

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According to the given data percentage composition of Cu in CuSO[tex]^{4}[/tex] is 25.45%

What is meant by percent composition?

The concept of percent composition is very straightforward. By mass, the percent composition of a compound reveals the percentage of each element that is present. The combination of two or more elements results in a chemical compound.

To calculate the percentage composition of Cu in CuSO[tex]^{4}[/tex] we first need to calculate the Molecular mass of CuSO[tex]^{4}[/tex].

Given,

Cu = 63.55 g/mol

S = 32.07 g/mol

O = 16.00 g/mol

Now,

The molecular mass of CuSO[tex]^{4}[/tex] = atomic mass of Cu + atomic mass of S + 4 × atomic mass of O

= 63.5+32+4×16

= 63.5+32+64 g

= 159.5 g

Percentage composition of Cu in CuSO[tex]^{4}[/tex]

(Atomic mass of Cu / Molecular mass of CuSO[tex]^{4}[/tex]) × 100

= (63.5/159.5) × 100

= 39.81%

So, the percentage composition of Cu in CuSO[tex]^{4}[/tex] is 25.45%

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The membrane is not associated with any movement of the na or k across the cell membrane Because the concentration of Na+ is higher outside the cell than inside the cell by a factor of 10.

4A.

Initiated by Influx od Na+

When a nerve is stimulated, Na ions enter in to the axon increasing the positive ions inside the axon. This causes reversal of the potential across the membrane. This is called depolarization which travels alsong the length of the neuron. Such a potential difference carried is called action potential. So, it all srats with influx of Na ions.

4B.

Cells of Macula densa are located in the afferent arteriole.

The above is not the right statement. Macula densa are the modified epithelial cells present in the walls of the distal convoluted tubule. It is not present in the walls of the afferent arteriole. Macula densa is sensitive to Na ion concentration. Low Na ions stimulate the juxta glomerulus to release Reinn which increases the blood pressure in blood vessels.

4C.

It represents the driving pressure for blood flow.

Normal blood pressure is 120/80 mm Hg. Where 120 is systolic pressure and 80 is diastolic pressure. The mean arterial pressure indicates the over all blood flow int he cardiac cycle so that the amount of nutrients reaching a tissue can be estimated. It is the average blood pressure in the cardiac cycle in an individual.

4 D

Arteriole diameter.

When the diameter of arteriole increases, there is more blood flowing in to capillaries with force. Because of increased pressure in arterioles, the capillary blood pressure will also increase. Decrease in colloidal osmotic pressure will decrease blood pressure. Interstitial cell albumin levles will not affect the blood pressure in blood vessels. Less arteriole resistance, blood pressure will reduce.

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[tex]{ \purple{ \tt{weak \: base}}}[/tex]

Explanation:

Because, in ethylamine, the carbon nearer to amine is a methyl group and they are electron releasing groups. So, the methyl group helps to increase electron charge density and it makes the compound more basic.

CH₃CH₂NH₂ (ethyl amine) is nucleophilic base.

A substance that can neutralize acids and accept hydrogen ions from water. Bases can turn some dyes blue and feel slippery or soapy on the skin. Sodium hydroxide is a good illustration of a base.

Because methyl groups, which are electron-releasing groups, are located closer to the amine in ethyl amine. The methyl group thus contributes to an increase in electron charge density and increases the basicity of the molecule.

The chemical formula for ethanamine, sometimes referred to as ethyl amine, is CH₃CH₂NH₂. It is base.

Thus, CH₃CH₂NH₂ is base.

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Taking into account the definition of calorimetry, the amount of energy needed to raise the temperature is 29,191.25 J.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without changes in its physical state (phase change). In other words, when heat added or removed from a substance causes a temperature change in it without affecting its molecular structure, it is called sensible heat.

The expression that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the definition of sensible heat:

Q= 24.2 J/Kmol× 9.65 moles× 125°K

Solving:

Q= 29,191.25 J

Finally, the amount of energy needed is 29,191.25 J.

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To determine the number of atoms of each element we need to multiply stoichiometry that is written in front of the molecule to the number that is written on the foot of the element. Hence, the balanced chemical equation for describing the oxidation of solid vanadium to aqueous vanadium(V) cations is V⁺ (aq) → V⁵⁺ (aq) + 4e⁻ (s).

Balanced chemical equation

Balanced equation is defined as the reaction where the number of atoms of each species is same on reactant and product side. In balanced equation mass can neither be destroyed nor be created.

The skeletal equation can be written as:

V⁺ (aq) → V⁵⁺ (aq) + 4e⁻ (s)

The number atoms of V on reactant and product side is 1 so V is balanced.

Hence, the balanced chemical equation for describing the oxidation of solid vanadium to aqueous vanadium(v) cations is:

V⁺ (aq) → V⁵⁺ (aq) + 4e⁻ (s)

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Ionic bonding is expected in KF because in it one is metal and one is non-metal which is essential to form an ionic bond.

What is Ionic bonding?

Ionic bonding is a kind of chemical bonding that includes the electrostatic attraction among oppositely charged ions, or among two atoms with sharply different electronegativities, and is the number one interplay taking place in ionic compounds. It is one of the primary styles of bonding alongside with covalent bonding and metal bonding. Ions are atoms (or organizations of atoms) with an electrostatic charge. Atoms that advantage electrons make negatively charged ions (called anions). Atoms that lose electrons make undoubtedly charged ions (called cations). This switch of electrons is thought as electrovalence in assessment to covalence.

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The inorganic salt of nitric acid and lead is the chemical compound lead(II) nitrate.

It is a strong, stable oxidant that appears as white powder or colorless crystal. It dissolves in water, unlike the majority of other lead(II) salts.

Since the Middle Ages, when it was known as plumb dulcis, its primary use has been as a raw ingredient for the creation of several pigments. It has been utilized industrially as a heat stabilizer in nylon and polyester since the 20th century, as well as in coatings for photothermographic paper.

In the United States, commercial manufacturing did not begin until after 1943, and in Europe, it did not begin until the 19th century. The typical production procedure involved metallic lead or lead oxide in nitric acid.

Therefore, The inorganic salt of nitric acid and lead is the chemical compound lead(II) nitrate.

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The major organic product obtained by reaction of benzoyl chloride with dimethylamine, (CH3)2 NH is in the figure.

For an organic chemist, a natural product is one this is produced by a living organism. This definition encompasses many compounds already mentioned, consisting of carbohydrates, proteins, lipids, and nucleic acids, all of which play an important and primary function in metabolic reactions.

The basic organic chemistry reaction types are addition reactions, removal reactions, substitution reactions, pericyclic reactions, rearrangement reactions, photochemical reactions and redox reactions. In natural synthesis, organic reactions are used in the construction of new organic molecules.

Exceptional chemical compounds used as fuels, insecticides and herbicides, diagnostics and medical devices, vitamins, perfumes, cosmetics, fabric and all styles of excessive-technology materials utilized in televisions, computers and other facts technology, and transportation and area machines are also the products of organic synthesis.

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