How do you define medium and high level profession?according to class 8?
please give this answer quickly​

Answer:

\(d)cellulose \\ monomer \: is \: glucose \\ thank \: you\)

Answer:

cellulose

Explanation:

Explanation:

guess

exothermic because of the heat

Answer:

V = 2,707.89 cm^3      V = 2,521.96 cm^3

Explanation:

Width x Length x Height = Volume

V = 10.62 x 83.6 x 3.05

V = 2,707.89 cm^3

83.6 - 5.74 = 77.86

V = 10.62 x 77.86 x 3.05

V = 2,521.96 cm^3

The volume of an object that is 83.6 cm long is 2,707.89 cm³. And the volume after 5.74 cm is cut off from the long edge is  V = 2,521.96 cm³.

Volume is the space occupied by an object, It can be calculated by dividing the mass and density.

Given the volume of an object that is 83.6 cm long.

The width is 10.62 cm

The thickness is 3.05 cm

Here, the volume of an object with given dimensions is to be calculated by the volume of a rectangle formula. Because there is thickness, width, and volume is given, it can be a rectangle.

Width x Length x Height = Volume

V = 10.62 x 83.6 x 3.05

V = 2,707.89 cm³

83.6 - 5.74 = 77.86

V = 10.62 x 77.86 x 3.05

V = 2,521.96 cm³

Thus, the volume will be 2,707.89 cm³. And after the cut volume will be 2,521.96 cm³.

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Based on the analysis above, the redox reactions that are expected to occur spontaneously in the reverse direction under standard conditions are A (-Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s)) and D (-2Ag+(aq) + Ni(s) → 2Ag(s) + Ni2+(aq)).

To determine which of the given redox reactions would occur spontaneously in the reverse direction under standard conditions (1 M for the aqueous ions), we need to compare the standard reduction potentials (E°) of the involved species.

The reaction will occur spontaneously in the reverse direction if the standard reduction potential of the oxidizing species (reduced form) is more positive than that of the reducing species (oxidized form).

Let's examine each reaction and compare the reduction potentials:

A. -Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s)

The reduction potential of Fe2+ is more positive than that of Mn2+. Therefore, this reaction is expected to occur spontaneously in the reverse direction. (+)

B. Mg2+(aq) + Fe(s) → Mg(s) + Fe2+(aq)

The reduction potential of Fe2+ is more positive than that of Mg2+. Therefore, this reaction is not expected to occur spontaneously in the reverse direction. (-)

C. 2La(s) + 3Sn2+(aq) → 2La3+(aq) + 3Sn(s)

The reduction potential of La3+ is more positive than that of Sn2+. Therefore, this reaction is not expected to occur spontaneously in the reverse direction. (-)

D. -2Ag+(aq) + Ni(s) → 2Ag(s) + Ni2+(aq)

The reduction potential of Ag is more positive than that of Ni2+. Therefore, this reaction is expected to occur spontaneously in the reverse direction. (+)

Based on the analysis above, the redox reactions that are expected to occur spontaneously in the reverse direction under standard conditions are A (-Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s)) and D (-2Ag+(aq) + Ni(s) → 2Ag(s) + Ni2+(aq)).

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Answer:

B. release oxygen as a product

Explanation:

7.11 grams will remain in 2 years from now.

What are two radioactive substances?

Radioactive substances are substances that contain atoms with unstable nuclei, which emit radiation in the form of alpha, beta or gamma rays. Two radioactive substances are uranium and radium. Uranium is a naturally occurring element that is radioactive, meaning it releases energy in the form of radiation. Radium is a radioactive element that is produced when uranium decays. Both substances can be found in the Earth's crust and can be used to generate electricity and power nuclear reactors.

Let the decay model be N(t) = N(0) e^rt

By data, we can write 8 = 9 * e^(r * 2)

8/9 = e^(2r)

2r = ln(8/9) = -0.1178

r = -0.1178/2 = -0.0589

Amount of the substance remaining 2 years from now = 8 * e^(-0.0589 * 2) = 7.11 grams

Therefore, 7.11 grams will remain in 2 years from now.

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True, both the alcohol and HX undergo a chemical change during the conversion of alcohol to alkyl halide.

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Answer:

3846g of Carbon tetrachloride is in the chemical equation.

Explanation:

The Balanced equation is :

   CH4 + 4CL2 -> CCL4 + 4HCL

Converting grams to moles ;

  Moles of CL2 = Mass / Molar mass

  Molles of CL2 = 709.0g/70.906g/mol => 10 moles

  Moles  of CCL4 = Moles of CL2 / 4

  Moles of CCL4 = 10 moles/ 4 => 2.5 moles

Converting moles of CCL4 to grams:

 Mass of CCL4 = Moles of CCL4 x Molar mass of CCL4

 Mass of CCL4 = 2.5 moles x 153.823 g/mol => 384.5575 grams

Therefore 384.6 grams of carbon tetrachloride can be produced from reacting 709.0 grams of chlorine.

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Atoms form positive ions by losing electrons or negative ions by gaining electrons through a special type of chemical combination called electrovalent or ionic combination.

It follows that metals are electropositive elements which donates its valence electrons to the nonmetals. The atoms which donates its electrons become positively charged while the species that recieve electrons become negatively charged.

In the formation of sodium chloride, sodium donates its 1 valence electron to chlorine become positively charged; Na+ and chlorine which recieves the electron to add to it's 7 valence electrons become negatively charged; Cl-

Na + Cl ---- Na+Cl-

So therefore, atoms form positive ions by losing electrons or negative ions by gaining electrons through a special type of chemical combination called electrovalent or ionic combination.

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Answer:

Lower, Higher

Explanation:

The reaction is endothermic with a heat of reaction is 2613 kJ/mol

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings, resulting in a decrease in temperature of the immediate surroundings.

We have that;

O=O = 5(495) = 2475

O - C - O = 4(358) = 1432

C- H = 2(413) = 826

O-H = 2(467) = 934

Then we have that;

Reactant side = ( 826 + 1678) + 2475 = 4979

Products side = 1432 + 934 = 2366 kJ/mol

Heat of reaction ion = Recants - Products

= 4979 - 2366

= 2613 kJ/mol

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We have about 1.1 * 10^24 ions phosphite polyatomic ions in the iron(II) phosphite.

We know that the number of moles can be used to determine the amount of substance that is present in the system. We are dealing with the compound that is called iron(II) phosphite here.

In this compound there are two moles of the phosphite ion and three moles of the iron II ion and this is what we would use for the calculation.

Number of phosphite polyatomic ions = 2 * 6.02 * 10^23 * 0.887 moles

= 1.1 * 10^24 ions

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Answer: HBr

Explanation:

The limiting reactant in the reaction is HBr.

Limiting reactant is the defined as the reactant which determines the maximum amount of product(s) that will be formed. As when it's all used up, the reaction stops and cannot proceed further, since the other reactant doesn't have anything to react with.

The limiting reactant provides the information about the amount of the products formed, as opposed to the reactant in excess which doesn't provide any valuable information.

The given reaction is already balanced. Hence, it gives us the information that 2 moles of Al requires 6 moles of HBr.

2Al + 6HBr ⇒ 2AlBr₃ + 3H₂

If 8 moles of Al will be reacted, it will require 24 moles of HBr, but we only have 8 moles of HBr.

On the other hand, if 8 moles of HBr will be reacted, it will only require 8/3 moles of Al which will leave excess Al unreacted. Reacting 8 moles of HBr with 8 moles of Al will produce 8/3 moles AlBr₃ and 4 moles H₂.

Hence, the limiting reactant is HBr.

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A single, substantial big molecule makes up each lattice. Ionic bonding helps to keep these lattices together. As a result, ionic bonds are frequently regarded as intermolecular.

option C

An ionic connection is created when a metal and a non-metal come together. The nonmetal receives electrons from the electropositive metal. As an electron is lost or gained, metals turn into cations, whilst nonmetals become anions. The electrical pull between these diametrically opposed ions forms the ionic bond.

Ionic compounds have well-ordered crystalline lattices when the ions and electrons are present. The fundamental unit of the lattice is connected to additional units via other units.

Hence, the charged ends of other molecules can be connected to the charged ends of ionic compounds. In this sense, ionic bonding might be referred to as intermolecular.

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The complete question follows

Why is ionic bonding considered both inter- and intramolecular bonding? A. lonic bonds are strictly intermolecular forces. B. Ionic bonds are strictly intramolecular bonds. C. Each lattice is a single large molecule of some substance. D. lonic solids form directly from gases 1 atom at a time. E. Molecules arrange themselves in a grid, and it's hard to tell where one molecule ends and the other begins.

Amines are the organic bases that react with acids and form ammonium salts.

Amines are Lewis bases. according to Lewis acid are the electron pair acceptor and bases are the electron pair donor. Amines are that contains a nitrogen atom connected to other groups with the single bond. Amine group has as lone pair of electrons. so. amines can donate the lone pair of electrons to the other molecules. so. amines are the bases or the Lewis bases. Amines are the weak bases. Amines are the derivative of ammonia.

Thus, Amines are the organic bases that react with acids and form ammonium salts.

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(d) 23894Pu is the radioisotope that is found naturally. It is a naturally occurring element that is present in uranium ores in very small concentrations.

Except 23894Pu, which is found naturally, the remaining isotopes on the list, in contrast, are typically created in nuclear reactors or particle accelerators and are not naturally occurring.

A. synthetic isotope created by nuclear processes is 24296Cm.

B. The radioactive hydrogen isotope 31H is a synthetic isotope.

C. The isotope 258103Lr is artificial, has a very brief half-life, and is not naturally occurring on Earth.

The term "radioisotope" refers to an unstable isotope of an element that undergoes radioactive decay. Isotopes are atoms of the same element with variable numbers of neutrons but the same number of protons in their nucleus. Nuclear reactions can be used to create radioisotopes intentionally or naturally in the environment. They are used in a wide variety of scientific, medical, industrial, and agricultural fields.

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Answer:

the acid used to neutralize the base in oder to form a salt and water

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When two clear substance combines, an insoluble solid is formed that settle downs as a ________.

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When two clear substance combines, an insoluble solid is formed that settle downs as a precipitate.

→A precipitate is a substance to be deposited in solid form from a solution.

______________________________________

Answer:

1.02 10 to the 23 power(or 100,000,000,000,000,000,000,000)

atoms of AL

Explanation:

ive had this question before

Answer:

The correct option is D

Explanation:

The major raw material used in making cement clinker is limestone. This limestone is usually mixed and heated with clay and can sometimes be mixed, in addition to the clay, with fly ash, black ash, bauxite, iron ore and gypsum. However, the product cement clinker contains different calcium silicates and/or aluminates such as Ca₃SiO₅, Ca₃Al₂O₆, Ca₂(Al,Fe)₂O₅ and Ca₂SiO₄. Thus, the correct option is D.

Answer:                                                                                                                   The tendency of the halogen elements to form salt like (i.e., highly ionic) compounds increases in the following order: astatine < iodine < bromine < chlorine < fluorine. ... The oxidizing strength of the halogens increases in the same order—i.e., from astatine to fluorine.

Explanation:

The complete formula of the hydrated salt is  MgCl.5H₂O.

Hydrated salts are salts that contain molecules of water in the moles of the compound.

The water present in the hydrated is incorporated into the crystal structure of the compound.

The complete formula of the hydrated salt is given below:

mass of water = 25.290 - 23.491

mass of water = 1.38 g

moles of water = 1.38 / 18

moles of water = 0.076 moles

mass of anhydrous salt = 23.491 - 22.130

mass of anhydrous salt = 1.361 g

moles of anhydrous salt = 1.361 / 95

moles of anhydrous salt = 0.014 moles

Mole ratio = 0.076/0.014 : 0.014/0.014

Mole ratio = 5 : 1

The formula of the compound = MgCl.5H₂O

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The value of Long Life Floors stock 5 years from today will be approximately $27.67 per share.

To calculate the value of the stock, we can use the dividend discount model (DDM). The DDM takes into account the present value of expected future dividends. In this case, the expected future dividends can be calculated by increasing the current dividend of $4 by 3 percent annually for five years. So, the expected dividends in five years would be $4 * (1 + 0.03)^5 = $4.62 per share.

Using a discount rate of 14 percent, we can calculate the present value of the expected future dividends. The formula for calculating the present value is: Present Value = Future Value / (1 + Discount Rate)^n, where n is the number of periods (in this case, 5 years).

Using the formula, the present value of the expected future dividends is: $4.62 / (1 + 0.14)^5 = $2.376 per share.

Therefore, the value of Long Life Floors stock 5 years from today is approximately $2.376 per share.

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Answer:

A. Water vapor from a factory smokestack

Answer:

Falso.

Explanation:

El modelo cuántico (no relativista) de Schrodinger, piensa a los electrones como ondas estacionarias, tal que la amplitud de dichas ondas decae muy rápidamente cuando se "alejaban" del radio atómico. (Es decir, habia poca probabilidad de que los electrones escaparan del radio atomico, y era por ello que se quedaban orbitando cerca del nucleo). Es decir, podríamos pensar en esto como una "nube de probabilidades" más que una nube electronica

La idea de nube electrónica realmente viene de modelos previos, como el de Rutherford o el de Bhor, los cuales eran modelos clásicos.

The complete chemical equation of the chemical reaction in which Beryllium chloride is heated with potassium to produce beryllium and potassium chloride is as follows:

Chemical equations are symbols and chemical formulas that depict a chemical reaction symbolically.

Chemical equations use the symbols of the elements, ions, or compounds that are involved in the reaction to represent the reaction.

The given reaction describes how Beryllium can be extracted from beryllium chloride.

The chemical reaction is as follows: Beryllium chloride is heated with potassium to produce beryllium and potassium chloride.

The chemical equation of the reaction is as follows:

BeCl₂ + 2 K ---> Be + 2 KCl

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The concentration of hydrogen ion (H+) that will produce the most acidic solution in water is 1 x \(10^{-3}\). This is because a higher concentration of hydrogen ion (H+) means a lower pH value, which indicates a more acidic solution.

The pH scale ranges from 0 to 14, with 0 being the most acidic and 14 being the most basic. A concentration of 1 x \(10^{-3}\) corresponds to a pH value of 3, which is considered highly acidic.

Conversely, a concentration of 1 x \(10^{-7}\) corresponds to a pH value of 7, which is neutral, while a concentration of 1 x \(10^{-5}\) and 1 x \(10^{-9}\) correspond to pH values of 5 and 9, respectively, which are less acidic than a concentration of 1 x \(10^{-3}\).

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The 25 mL is the calibration of this Erlenmeyer flask. so, option (b) is correct.

What is calibration ?

The process of calibrating a measurement instrument involves comparing it to a traceable reference device and documenting the comparison. A "calibrator" is another name for the reference standard. It stands to reason that the reference is more accurate than the calibration instrument.

What is  Erlenmeyer flask?

Erlenmeyer flasks are used to mix, heat, cool, incubate, filter, store, and perform various liquid-handling operations on liquids. For titrations and boiling liquids, their sloping sides and narrow necks enable the contents to be blended by swirling without the risk of spillage.

Therefore, 25 mL is the calibration of this Erlenmeyer flask.

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Answer:

I believe B

Explanation:

Hope this helps