a 2.25-g sample of magnesium nitrate, mg(no3)2, contains mol of this compound. question 20 options: 0.0152 65.8 38.4 148.3 0.0261

The aqueous solution of sodium chloride is 56.9g

Reason:

Given:

Molarity = 1.9M,

Volume = 55 mL,

Molar Mass NaCl = 58.44 = [ 22.99 + 35.45 ], 1.9M means 1.9 moles in 1000 mL

55mL -> (1.9)(55/1000) = 0.1045

Mass in g = (58.44)(0.1045) = 6.10698

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When a compound's qualities cannot be fully explained by a single structure, we require more structures. These additional structures are known as resonance structures, and the phenomenon they describe is known as resonance.

Resonance is the term used to describe the phenomena of enhanced amplitude that happens when the frequency of a periodic force is applied (or a Fourier component of it) is equal to or nearly equal to the natural frequency of the system on which it works. In contrast to when the same oscillating force is applied at other, non-resonant frequencies, a dynamic system will oscillate at a higher amplitude when the oscillating force is applied at its resonant frequency.

Resonant frequencies or resonance frequencies of the system are frequencies at which the response amplitude is a relative maximum. Small periodic forces that are close to a resonant frequency of the system can produce large amplitude oscillations in the system due to the storage of vibrational energy.

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SiO₂ formed as a precipitate.

Elemental silicon is oxidized by O₂ to give a compound which dissolves in molten Na₂CO₃ . When this solution is treated with aqueous hydrochloric acid, SiO₂ formed as a precipitate.

Mechanism 1

1. Si     +     O₂    →    SiO₂

2. SiO₂     +     Na₂CO₃  →  CO₂ + Na₂SiO₃

3. Na₂SiO₃   +   2 HCl (aq)   →  2 NaCl + H₂O (l) + SiO₂

In chemistry, a stable shaped via a change in a solution, frequently due to a chemical reaction or change in temperature that decreases solubility of a stable. In meteorology a precipitate is liquid or strong water.

Hence, SiO₂ formed as a precipitate.

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In a redox reaction, any increase in the oxidation state of a reacant must be accompanied by a decrease in the oxidation state of a reactant.if any of the reactants or products in a reaction contain oxygen, the reaction is a redox reaction. redox reaction is a reaction in which there is a change in the oxidation states of atoms in going from reactants to products.

a chemical process that occurs when an object comes into touch with oxygen or another oxidizer. Rust and an apple's brown color are examples of oxidation. There is an oxidation reaction when oxygen interacts with a substance or an element. The process of removing hydrogen from the reactant species is another definition of oxidation. A molecule, atom, or ion undergoes oxidation when it loses electrons.

Reactions where electrons are gained are referred to as reduction, whereas reactions where electrons are lost are referred to as oxidation.

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Answer:

a reaction in which the exchange of electrons (oxygen) occurs.

Explanation:

Energy is required for evaporation, and so this extra heat is expended from the body. they both feel chilly as they dissipate.

Describe evaporation and provide instances.

In the water cycle, evaporation happens when water from any body of water on the earth's surface evaporates into the atmosphere. Rain is produced when this water cools. Evaporation is what creates the steam inside a warm cup of coffee or tea.

What is the evaporation process?

The process of evaporation turns liquid water into gas water (water vapor). Evaporation is how water gets from the surface of the Earth to the atmosphere. Heat energy causes the bonds holding the water together to fall apart, which causes evaporation.

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The element with the highest melting point is bromine (Br2). As a result, choice (A) is the right one.

The attractive and repellent forces that form between the molecules of a substance are known as intermolecular forces. The majority of the chemical and physical characteristics of matter are governed by these forces. Vander Waals forces are the intermolecular forces that hold molecules together.

Intermolecular forces are those that exist within the molecules themselves. Intermolecular forces keep the particles of solids and liquids bound together.

Dipole-Dipole Interactions, Ion-Dipole Interactions, Ion-Induced Dipole Interactions, Dipole-Induced Dipole Interactions, and Dispersion Forces are the intermolecular forces.

A significant amount of energy will be needed to break bonds as atom sizes grow because of the stronger intermolecular force. Since among all the elements, bromine is the largest in size. Bromine will therefore have the highest melting point.

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According to law of conservation of mass and stoichiometry, if 25.0 g of NH₃ and 51.5 g of O₂ react in the given reaction 816 g of NO will be formed.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

As per the law, mass of reactant= mass of products, (4×25)+(5×51.5)-(6×18)=816 g.

Thus, 816 g of NO is formed in the given reaction.

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RbCl has a lower charge and a higher melting point. Since the strontium and oxygen ions are bound acrystalline lattice according to the bonding concept, you would expect SrO to have a higher melting point.

What, in theory, is bonding?

Valence Covalent bond formation and the electrical structure of molecules are both covered by bond theory. The theory presupposes that inside a molecule, specific atoms' atomic orbitals are occupied by electrons, and that electrons from one atom are drawn to the nucleus of another atom.

What are the three theories of bonds?

Lewis hypothesis In this idea, the atom's surrounding electrons and lone pairs are represented by dots. Theory of valence bonds: According to this hypothesis, bonds are formed when electrons are shared among atoms' orbitals. Theory of molecular orbitals That is

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The solubility (in g/l) of caso4(s) in 0.300 m na2so4(aq) at 25°c is 0.016762 g/mol.

Solubility is defined as the maximum amount of a substance in an effort to dissolve in a given quantity of solvent at a special temperature. Solubility is a characteristic asset of a particular solute-solvent combination, and special substances have significantly differing solubilities.

Solubility of CaSO₄; K_sp = 4.93 × 10⁻⁵

Concentration of Na₂SO₄ = 0.4 M

The ionic equation of CaSO₄ is given as;

CaSO₄ ⇒ Ca²⁺ + SO₄²⁻

Now, the formula for solubility ,

K sp = [A⁺]ᵃ × [B⁻]ᵇ

Thus, plugging in relevant values into the solubility equation -

4.93 × 10⁻⁵ = Ca²⁺ × 0.4

Ca²⁺ = ( 4.93 × 10⁻⁵)/0.4

Concentration of Ca²⁺ = 12.325 × 10⁻⁵ M

The molar mass of CaSO₄ =  136 g

Hence, solubility of CaSO₄ in 0.4M of Na₂SO₄ is 12.325 × 10⁻⁵ M × 136 g/mol = 0.016762 g/mol

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The ka for the monoprotic  acid is 5.37 × 10⁻⁴.

Consequently, a monoprotic acid is an acid that may donate simplest one proton, whilst polyprotic acid can donate multiple proton. in addition, a monoprotic base can most effective accept one proton, while a polyprotic base can take delivery of more than one proton.

The key difference among monoprotic and diprotic acid is that monoprotic acids are able to donate one hydrogen atom or proton to their aqueous solution, while diprotic acids are able to donate  hydrogen atoms or protons to their aqueous answer.

Calculation:-

The value of dissociation constant of acid is

Ka = (0.00295)(0.00295)/0.0162)

Ka = 5.37 × 10⁻⁴

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Calculating the tension of hydrogen gas gathered over water is possible using Dalton's Law of Equivalent Pressures.

Around room temperature and pressure, hydrogen is a gas, but at -423 degrees Fahrenheit, it condenses into a liquid (minus 253 degrees Celsius).

The gasoline for engines with internal combustion can also be hydrogen. These, however, are less effective than FCEVs and emit tailpipe pollutants. Try reading up on fuel cells. A gallon of gasoline (6.2 kilograms, 2.8 kilograms) has approximately the same amount of energy as 2.2 gbp (1 kilogram) of hydrogen.

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The hydrogens just on carbons close to the carbonyl group have a shift towards carbonyla triple - negative electronegative atoms of about 200 ppm.

What is the name of the carbonyl group?

A carbon atom is double-bonded to the an oxygen atom to form a carbonyl group, that is a chemically active functional group. Aldehydes and ketones, which are typically joined to another carbon compound, are the simplest carbonyl groups. Many aromatic chemicals have these structures, which contribute to flavor and fragrance.

Which structural subunits make up carbonyls?

Carbonyl-containing functional groups include aldehydes and ketones. The primary distinction is that for carbon to be a member of these functional groups, it must be doubly bonded to other groups in addition to oxygen. A ketone must have a connection between the carbonyl carbon and

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The pH of the solution is 11.6

given that :

molarity of Ba(OH)₂ = 0.020 M

volume = 50 mL = 0.05 L

number of moles = molarity × volume in L

                            = 0.020 ×  0.05

                            = 0.001 mol

the molarity after dilution = 0.001 / 0.250

                                           = 0.004

pOH = -log (0.004 )

        = 2.39

pH + pOH = 14

pH = 14 - pOH

     = 14 - 2.39

     = 11.6

Thus,  the pH of a solution prepared by diluting 50.00 ml of 0.020 m  Ba(OH)₂ with enough water to produce a total volume of 250.00 ml is 11.6.

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Option b; Phosphorus trichloride is used in the production of chemicals that keep plants from growing in a specific area. This compound is made of phosphorus and chlorine atoms. Two symbols are p and cl.

An inorganic substance with the chemical formula PCl3 is phosphorus trichloride. It is a significant industrial chemical that is used to make phosphites and other organophosphorus compounds. When pure, it is a colorless liquid. It is poisonous and easily combines with water to produce hydrogen chloride. Over one million tones are produced globally. Industrially, white phosphorus and chlorine are combined while utilizing phosphorus trichloride as a solvent to create phosphorus trichloride. In this ongoing procedure, PCl3 is eliminated as it forms to prevent the creation of PCl5. It is triangular and pyramidal in shape. Regarding a standard for phosphoric acid, its 31P NMR spectrum shows a singlet at about +220 ppm.

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First, lets examine the formula for that of Ammonia.

Ammonia = NH3

Notice that in the formula, there are 3 hydrogen atoms in a single ammonia molecule. This being said, if there are 200 molecules of ammonia in the given scenario, multiply 200 by 3.

[tex]200[/tex] × [tex]3 = 600[/tex] ← Amount of (H) Atoms Present in 200 (NH3) Molecules

Hope this helps!

The methyl group of pyruvate is where C1 labels when it is added to glucose. A hexose is split into two trioses by aldolase.

What exactly happens during fermentation?

Carbohydrates are broken down by the enzymes of microorganisms during fermentation in the absence of oxygen. Microorganisms like bacteria and fungi are able to produce enzymes that can break down different kinds of sugar molecules because they have unique sets of metabolic genes.

Short answer: What is the fermentation process?

A substance decomposes into a simpler substance through the process of fermentation. In the absence of oxygen or any electron transport, the metabolic process known as fermentation transforms organic molecules (mostly carbohydrates like starch or sugar) into acids, gases, or alcohol.

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Beaker a is filled to the brim with water. beaker b is the same size and contains a small block of wood which floats when the beaker is filled with water to the brim. both beakers  weighs same more.

In its gaseous, liquid, and solid states, water is a substance made up of the elements hydrogen and oxygen. It is among the most common and necessary compounds. At room temperature, it is an odorless, tasteless liquid with the significant property of dissolving many other substances. Glass container with a flat bottom and a tiny pouring spout is known as a beaker. It is employed in the chemistry lab to stir, heat, and mix liquids. Beakers are cylindrical containers that come in a range of sizes.

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Straight-chain alkane undecane has 24 hydrogen atoms in it.

10 carbon atoms and 22 hydrogen atoms are covalently linked together to form the hydrocarbon decane. Decane is a member of the enormous organic family known as alkanes. The only atoms in the hydrocarbon molecules of the alkane family are carbon and hydrogen.

Consequently, the alkyne with 16 hydrogen atoms has the formula C9H16 C 9 H 16. Alkenes are hydrocarbons with a double bond connecting the carbon atoms. Their usual formula is CnH2n, or C n H 2 n. 2n = 44, where n is the number of hydrogen atoms.

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Answer:

9.68x10^21 molecules of nitrogen

Explanation:

I will assume that r.t.p. is supposed to be STP, Standard Temperature and Pressure.  rtp might refer to room temperature and pressue, but no value is given for room temperature, so let's assume standard temperature (0 degrees Celsius).  Here is a marvelous, and useful, property of gasses at STP:  One mole of gas at STP occupies 22.4 liters.  Let's make that a conversion factor:  (1 mole/22.4 liters).

We have the volume of gas at STP:  360 cm^3.  Convert that into liters:

(360cm^3)*(1 ml/cm^3)*(1 liter/1000 ml) = 0.360 liters(L)

Now use the conversion factor from above to convert the volume of gas into moles of gas:

 (0.360L)*(1 mole/22.4 liters) = 0.0161 moles of gas

By definition, 1 mole is 6.02x10^23 particles, or molecules of the gas.

Convert moles of the gas to molecules:

(0.0161 moles)*((6.02x10^23 molecules)/mole) = 9.68x10^21 molecules of nitrogen.

a) The symbol of potassium is K

b) The symbol of oxygen is O

c) The symbol of tin  ( 2 electrons lost) Sn²⁺ and its cation.

d) The symbol bromine is Br

e) The symbol beryllium is Be

f) The symbol cobalt (3 electrons lost ) is  Co³⁺ and it's a cobaltic cation.

What is the symbol for a chemical?

Chemical elements, functional groups, and chemical compounds are represented by chemical symbols, which are acronyms used in chemistry. Elements' chemical symbols typically include one or two Latin letters, with the first letter capitalized.

As superscripts or subscripts, additional information, such as an isotope, an ionization state, or an oxidation state, can be added to the symbol in addition to the letters. Some isotopes have unique symbols instead of isotopic information added to the element symbol.

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Experimental evidence of Atomic energy by Hydrogen bright line spectrum

The hydrogen bright line spectrum provides evidence by showing different colours which are having different wavelengths.

What is Hydrogen Bright Line Spectrum?

The Rydberg formula has been used to determine the wavelengths of several spectral series that have derived from the emission spectrum of atomic hydrogen. These spectral lines that have been seen are the result of electron transitions between two energy levels within an atom. The development of quantum mechanics was greatly aided by the Rydberg formula's classification of the series. In astronomical spectroscopy, the spectral series are crucial for determining red shifts and detecting the existence of hydrogen.

Experimental evidence of Atomic energy by Hydrogen bright line spectrum

The hydrogen bright line spectrum provides evidence by showing different colours which are having different wavelengths.

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For isothermal process dq=-dw=-300J  dU=0 , for adiabatic process  dq=0 so dU=dw=300J.

What is isothermal process?

In this process the change in temperature is zero through out. So dT=0

What is adiabatic process?

The change in heat is zero through out. So dq=0

From first law of thermodynamics internal energy dU=dq+dw,

for isothermal process dT=0 and dU=n[tex]C_{v}[/tex]dT so dU=0 thus dq= - dw,= -300J.

for adiabatic process dq=0, so dU=dw=300J

What is internal energy ?

Any system for the virtue of its existence have  energy known as internal energy.

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Answer: Umm

Explanation:

I can't draw on the picture oh wait I can let me add my answer

Answer:Well just use the numbers in the chart and go from the bottom to the top. I understand that these are hard I would recommend watching a video on something that is similar to this problem and do it that way I understand if This is not much help but this question has stumped me. :(

Explanation:

The change in the activation energy barrier is the same: 27.6 kJ/mole.

By reducing the activation energy, a catalyst can speed up a process. In the case of this question, the activation energy is reduced by 27.6 kg per mole, which unquestionably speeds up the reaction.

However, a catalyst does not disrupt the equilibrium because it clearly affects both the forward and backward reaction rates as shown in the picture attached below.

As a result, the forward reaction's activation energy is reduced by 27.6 kJ/mole. Then perhaps the activation energy barrier, 27.6 KJ/mole for the reverse reaction, does not change. Consequently, the addition of a catalyst has no effect on the equilibrium.

Therefore, the activation energy barrier remains constant at 27.6 kJ/mole.

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Tert-butanol has a -OH group so it will undergo hydrogen bonding and it will show the highest boiling point, while tert- butyl bromide has no hydrogen bonding.

When a liquid's vapour pressure equals that of the gas above it, that liquid has reached its boiling point. When a liquid's vapour pressure reaches one atmosphere, it is said to have reached its usual boiling point (760 torrs).

Two atoms that are already involved in other chemical connections are attracted to one another in a hydrogen bond. Hydrogen is one of the atoms, while the other can be any electronegative element, such as oxygen, chlorine, or fluorine. Atoms within a molecule or molecules can form hydrogen bonds with one another.

Hence, tert-butanol has a -OH group so it will undergo hydrogen bonding and it will show the highest boiling point, while tert- butyl bromide has no hydrogen bonding.

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The same amount of added energy in water not increase its temperature as much as in ethanol because of temperature difference.

What is temperature?
The physical concept of temperature expresses in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using a variety of temperature scales, which historically defined various reference points as well as thermometric substances. The most popular scales are the Celsius scale, also known as centigrade, with the unit symbol °C, the Fahrenheit scale (°F), as well as the Kelvin scale (K), with the latter being primarily used for scientific purposes. One of the seven units inside the International System of Units is the kelvin (SI).

The average kinetic energy of all the atoms or molecules that make up a substance is how we define temperature in chemistry. A substance's constituent particles do not all possess the same kinetic energy. The distribution of the particles' kinetic energy at any particular moment can be used to describe it.

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The relative abundance of Li-6 =0.0749 = 7.49%

The relative abundance of Li-7 =1 - 0.0749 = 0.9251 =92.51%

Formula used to calculate average atomic mass follows:

Avg atomic mass = ∑(atomic mass of an isotope) x (fractional abundance) ....(1)

Let the fractional abundance of Li-6 isotope be 'x'. So, fractional abundance of  Li-7 isotope will be '1 - x'

For Li-6 isotope:

Mass of  Li-6 isotope = 6.015 amu

For Li-7 isotope:

Mass of  Li-7 isotope =  7.016 amu

Average atomic mass of lithium =  6.941 amu

6.941 amu = x *(6.015) + (1-x) * (7.016)

x= 0.0749

The relative abundance of Li-6 =0.0749 = 7.49%

The relative abundance of Li-7 =1 - 0.0749 = 0.9251 =92.51%

Therefore, the relative abundance of the isotope is 92.51%

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All the following statements are true about water.

Amphoteric nature:

A molecule or ion that can react both as an acid and as a base is known as an amphoteric compound. Since water has the potential to act both as an acid and as a base, water is amphoteric in nature.

All the statements are true about water. Water is amphoteric in nature which means that it can react with both acid as well as base. When reacting with base water acts as an acid and while reacting with acid, it acts as a base.

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Sulfur is in the same column of the periodic table as oxygen but it is less electronegative than oxygen , the H₂S molecules will behave as not be able to form hydrogen bonds with each other.

The hydrogen bond is the type of the dipole dipole interaction between the molecules directly attached to the more electronegative atom like Fluorine , oxygen and nitrogen.  for hydrogen bonding the molecule must contain highly electronegative atom.  the hydrogen bonding are of the two types : intermolecular hydrogen bonding and intramolecular hydrogen bonding.

Thus, sulfur is in the same column as oxygen but  H₂S molecules will not form the hydrogen bond with each other.

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