On a cold day the atmosphere temperature is reported as 12. 9F what is the temperature in kelvin ? ( please note that the constant 273. 15 is an exact number

Option A, I2, has only London forces.

London forces, also known as dispersion forces, are the weakest type of intermolecular forces. They are present in all molecules, but they are especially important in nonpolar molecules like I2. London forces are caused by fluctuations in the distribution of electrons in a molecule, which result in temporary dipoles. These dipoles can interact with neighboring molecules, creating attractive forces.

In contrast, NH2, OCl2, and SH2 all contain polar covalent bonds, which give rise to additional intermolecular forces, such as dipole-dipole interactions and hydrogen bonding. Dipole-dipole interactions are stronger than London forces, and hydrogen bonding is the strongest type of intermolecular force.

So, while London forces are present in all molecules, they are the only type of intermolecular force present in I2. The other options, NH2, OCl2, and SH2, also have London forces, but they have additional intermolecular forces due to the presence of polar covalent bonds and hydrogen bonding.

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Energy transformation is the process by which energy is changed from one form to another. For instance, a hydroelectric dam can turn the kinetic energy of moving water into electrical energy.

Energy conservation is the practice of maintaining the overall amount of energy while allowing for its transmission or transformation. For instance, a toaster warms up your bread by converting electrical energy to thermal energy. Electrical energy is converted by a cell phone into electromagnetic energy that is transmitted to other phones. The chemical energy in your diet is converted by your body into the mechanical energy required to move your muscles. To apply several transforms to an object is to mix different transforms into a single transform. This entails utilizing the results of one transformation matrix as the input for another, accumulating the effects of all the matrix transformations.

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It's vapor pressure in a solution made from equal moles of solvent and solute is : b) 50 torr .

Vapor pressure of a solution is dependent on the nature of solute and solvent and their interactions. The vapor pressure of a solution is lower than that of the pure solvent due to the presence of the solute particles interfering with solvent molecules' ability to escape into vapor phase.

Given, pº = 100 torr

p = (1/2) * pº = (1/2) * 100 torr = 50 torr.

So, the vapor pressure of the solution made from equal moles of solvent and solute is 50 torr.

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Ve, or the equivalent point, is the point at which the number of moles of HCl added is equal to the number of moles of sodium propanoate initially present.

Petition is a laboratory technique used to determine the concentration of a sample solution by measuring the volume of a unknown concentration it required that is the weather the sample solution it is a quantitative analyze method used to determine by the amount of the certain substance present in a given solution it is most commonly used in acid phase titration in which the concentration of an acid or base is determined by measuring the volume of a unknown concentration of a base or acid required to neutralize it.

In this case, Ve can be calculated by using the following equation:

Ve = (0.040 0 mol Na Propanoate) / (0.083 7 mol HCl) = 0.475 mL

The pH of the solution at the different points of the titration can be calculated using the following equation:

pH = -log[H+]

At Va 0, the pH is equal to the pH of the sodium propanoate solution, which is 7.4.

At 1/4 Ve, the pH is 6.8.

At 1/2 Ve, the pH is 6.2.

At 3/4 Ve, the pH is 5.6.

At Ve, the pH is 5.0.

At 1.1Ve, the pH is 4.4.

The titration curve for the titration of 0.040 0 M sodium propanoate with 0.083 7 M HCl can be sketched as follows:

Va 0 | |

| |

| |

1/4 Ve | |

| |

| |

1/2 Ve | |

| |

| |

3/4 Ve | |

| |

| |

Ve | |

| |

| |

1.1 Ve | |

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The vapor pressure of a solution made by dissolving 88.2 g of urea in 303 mL of water at 35°C is 38.8mmHg.

The amount of pressure that the vapours impart to the liquid solvent when they are in equilibrium and at a specified temperature is referred to as the vapour pressure of liquid solutions. The surroundings' temperature and the sort of liquid both impact the vapour pressure.

mass of urea = 88.2g

molar mass of urea  = 60.06 g/mol

Temperature = 35°C

water volume = 303 mL

Vapor pressure of water =  0.9192 mm Hg.

Mass of water = 0.994g/mL x 303mL => 301.2 g

number of moles of water = 301.2/18 => 16.73 mol

number of moles of urea = 88.2/66.06 = 1.469mol

mole fraction of water => 16.73/(16.73+1.469)

                               => 0.9192

Vapour pressure of solution =  0.9192 x  0.9192

                                               => 38.8mmHg

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The ratio of moles of Mgo to moles Fe is  3 mol Mgo / 2 mol Fe.

A mole is a unit of measurement for the amount of a chemical substance. It is used to quantify the number of entities (such as atoms, molecules, or ions) in a sample of a substance. The mole is defined as the amount of a substance that contains Avogadro's number of entities, which is defined as 6.022 x [tex]10^{23}[/tex] entities per mole. In other words, one mole of a substance contains 6.022 x [tex]10^{23}[/tex] atoms, molecules, or ions of that substance. The mole is used in many aspects of chemistry, including chemical reactions, stoichiometry, and chemical calculations.

The balanced equation for the reaction between magnesium (Mg) and iron (III) oxide (Fe2O3) is:

3 Mg + Fe2O3 -> 2 Fe + 3 MgO.

From the equation, it is clear that for every three moles of magnesium, two moles of iron are produced. Hence, the ratio of moles of MgO to moles of Fe is 3 moles MgO / 2 moles Fe, or simply b) 3 mol MgO / 2 mol Fe.

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The CCl4 molecule's size and form are fully specified by the fact that it is tetrahedral, 2. having 109. ° bond angles.

Tetrahedral electron pair arrangements around the carbon atom in CCl4 necessitate sp3 hybridization. The six bonds to chlorine are created using the six sp3 hybridized orbitals from carbon.

The only intermolecular that exist between Cl2 and CCl4 are London Dispersion Attractions because both molecules are nonpolar and lack any other distinctive properties.

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The molar solubility of silver arsenate in pure water at 25°C is:

S = (1.0 x 10^-22 / [AsO4^3-])^(1/3)

The molar solubility of silver arsenate in 0.10 M AgNO3 is:

S = 4.22 x 10^-7 M

(a) Molar solubility of silver arsenate in pure water at 25°C can be calculated using the solubility product constant Kp and the expression:

Ag3AsO4(s) = Ag+ (aq) + AsO4^3- (aq)

Kp = [Ag+]^3 [AsO4^3-]

Rearranging, we have:

[Ag+]^3 = Kp / [AsO4^3-]

Taking the cube root of both sides:

[Ag+] = (Kp / [AsO4^3-])^(1/3)

Since Kp = 1.0 x 10^-22, we have:

[Ag+] = (1.0 x 10^-22 / [AsO4^3-])^(1/3)

Since the molar solubility is equal to the concentration of Ag+ ions, the molar solubility of silver arsenate in pure water at 25°C is:

S = (1.0 x 10^-22 / [AsO4^3-])^(1/3)

(b) To calculate the molar solubility of silver arsenate in 0.10 M AgNO3, we need to use the common ion effect. The presence of AgNO3 will increase the concentration of Ag+ ions in the solution and thus decrease the solubility of silver arsenate.

The solubility product constant equation can be written as:

Kp = [Ag+]^3 [AsO4^3-] = S^3 * [AsO4^3-]

Rearranging, we have:

S^3 = Kp / [AsO4^3-]

Since Kp = 1.0 x 10^-22 and [AsO4^3-] = S, we have:

S^3 = 1.0 x 10^-22 / S

S^4 = 1.0 x 10^-22

S = (1.0 x 10^-22)^(1/4) = 7.07 x 10^-6 M

However, this is the solubility in pure water. In 0.10 M AgNO3, the concentration of Ag+ ions is 0.10 M. So, we need to use the equation:

Ksp = [Ag+]^3 [AsO4^3-] = (0.10 + S)^3 S

Rearranging, we have:

S^3 = Ksp / (0.10 + S)^3

Substituting Ksp = 1.0 x 10^-22, we have:

S^3 = 1.0 x 10^-22 / (0.10 + S)^3

Solving for S, we obtain the molar solubility of silver arsenate in 0.10 M AgNO3 as:

S = 4.22 x 10^-7 M

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The formal charge on nitrogen in case of NH⁴⁺ (ammonium) ion is +1.

The formal charge of an atom in a molecule is defined as the charge that would reside on the atom if all of the bonding electrons were shared equally.

Knowing the formal charge on a particular atom in a molecule or a structure is an important part of keeping track of the electrons and is important for establishing and predicting the reactivity. The formal charge on an atom in a molecule reflects the electron count associated with the atom in the molecule compared to the isolated neutral atom.

The formal charge on nitrogen atom in ammonium ion is +1.

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Option A) Cerebrosides and gangliosides are sphingolipids. B) Phosphatidylcholine is a typical sphingolipids. D) They contain two esterified fatty acids. E) They may be charged, but are never amphipathic are true regarding sphingolipids.

A) Cerebrosides and gangliosides are sphingolipids is true. Sphingolipids are a group of lipids composed of a sphingosine backbone, a long-chain fatty acid, and a carbohydrate group. They are essential components of the cell membrane, and are involved in a variety of biological functions. Cerebrosides and gangliosides are two common types of sphingolipids, which contain a sugar residue and multiple sugar residues, respectively.

B) Phosphatidylcholine is a typical sphingolipid is also true. Phosphatidylcholine is a type of glycerophospholipid that contains a glycerol backbone linked to two fatty acids by ester bonds. It is an important component of cell membranes and is involved in many cellular processes.

C) They always contain glycerol and fatty acids is false. Not all sphingolipids contain glycerol and fatty acids; for example, cerebrosides and gangliosides contain a sugar residue or multiple sugar residues instead of glycerol and fatty acids.

D) They contain two esterified fatty acids is true. All glycerophospholipids, including phosphatidylcholine, contain two fatty acids linked to the glycerol backbone by ester bonds.

E) They may be charged, but are never amphipathic is true. Sphingolipids are amphiphilic molecules that contain both hydrophilic and hydrophobic regions. They may be positively or negatively charged, but they are never completely amphipathic.

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The theory of the atom is credited to John Dalton, an English chemist and meteorologist who lived in the late 18th and early 19th centuries.

He is considered the father of modern atomic theory. Dalton's work laid the foundation for our understanding of the atom and its role in chemical reactions. Dalton proposed that elements are composed of tiny, indivisible particles called atoms, which cannot be created or destroyed in chemical reactions. He also suggested that each element has a unique type of atom and that atoms of the same element are identical in size, mass, and other properties. He further proposed that chemical reactions occur when atoms combine or separate, and that the ratio of atoms in a compound is always the same.

Dalton's theory was based on his extensive studies of the properties of gases and his observations of chemical reactions. He was able to explain the law of multiple proportions, which states that the ratios of the masses of two elements that combine to form a compound are always in a simple whole number ratio.

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Since oxygen belongs to group 6 in the periodic table, it contains 6 valence electrons in its outer shell.

What is the oxygen valency?

Oxygen has an electronic configuration of 2,6. To complete the octet and reach stability, it needs 8 electrons in its outermost shell, which it either accepts or accepts. Consequently, oxygen has a valency of 2.

We can infer from the oxygen atom's electrical structure that there are 6 electrons in the second shell, which is the outermost shell. Consequently, an oxygen atom has six valence electrons in total.

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The density of hydrogen at 2000°C if it is dissociated into ideal gas  atoms and at a pressure of 1 atm is 5.16 x 10^-5 g/L.

The density of hydrogen at 2000°C if it is dissociated into atoms can be calculated as follows:

First, we need to find the number of moles of hydrogen produced from the dissociation of 1 mol of H2.

H2 → 2H, so 1 mol of H2 produces 2 moles of H.

Next, we need to find the volume occupied by these 2 moles of H at a pressure of 1 atm and temperature of 2000°C. Since hydrogen is an ideal gas, we can use the ideal gas law to find the volume:

PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

So, we have:

V = (nRT) / P

V = (2 * 8.31 * (2000 + 273)) / (1)

V = (16.62 * 2373) / 1

V = 38,923 L

Finally, we can calculate the density of hydrogen at 2000°C:

density = mass / volume

density = (2 * 2.01588 g/mol) / (38923 L)

density = 0.0000516 g/L = 5.16 x 10^-5 g/L

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The attractive force between the like molecules involved in the capillary action is the correct option is E. Adhesion.

The Capillary action is the process of the liquid that is flowing in the narrow space and without the assistance of, and even in the opposition of, any external forces of gravity. Adhesion is the property of the H₂O molecules to combine with themselves with the other molecules of the different type.

The capillary action is the conduction of the water from the soil from the roots of the plants and to the other parts of the plant.

Thus, the attractive force between the molecules involved is Adhesion force.

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The equivalence point can be determined by using a pH meter or an indicator, which measures the acidity or basicity of a solution.

In acid-base reactions, the equivalence point is the point at which the amount of hydrogen ions and hydroxide ions are equal, leading to a neutral solution. The pH of the solution will be 7 at this point.

In redox reactions, the equivalence point is the point at which all of the reactants have been consumed and all of the products have been formed. This can be determined by monitoring the change in concentration of one of the reactants over time and finding the point at which the change in concentration levels off.

In titrations, the equivalence point can also be found by adding a known volume of a reagent of known concentration to a solution of the reactant. The reagent will react with the reactant until the equivalence point is reached, at which point the reaction will stop. The volume of the reagent added at the equivalence point can be used to determine the concentration of the reactant.

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An organism that acts as the principal generator in a food supply chain is referred to as an autotroph in ecology. Through photosynthesis and oxidation, autotrophs use sunlight to produce energy and nutrients.

An oxidation reaction is what?

an reaction in which an element's atoms lose electrons, increasing the element's valence in the process. [French, from the verb oxidiser, which comes from the word oxide; see oxide.] Fifth Edition of the American Legacy® Lexicon of the English Language. Harvard Mifflin Harcourt Publishing Company, 2016. Copyright.

What is the oxidization procedure?

When a molecule, atom, or ion's oxidation state is raised, oxidation takes place. When there is an increase in electrons or a drop in an atom, peptide, or ion's oxidation state, the process is known as reduction. In

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An organism that acts as the principal generator in a food supply chain is referred to as an autotroph in ecology. Through photosynthesis and oxidation, autotrophs use sunlight to produce energy and nutrients.

An oxidation reaction is what?

An reaction in which an element's atoms lose electrons, increasing the element's valence in the process. [French, from the verb oxidiser, which comes from the word oxide; see oxide.] Fifth Edition of the American Legacy® Lexicon of the English Language. Harvard Mifflin Harcourt Publishing Company, 2016. Copyright.

What is the oxidization procedure?

When a molecule, atom, or ion's oxidation state is raised, oxidation takes place. When there is an increase in electrons or a drop in an atom, peptide, or ion's oxidation state, the process is known as reduction. In

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Electrons are subatomic particles that are associated with negative charges and are found in the outermost energy level of an atom.

The positively charged protons and neutral neutrons that make up an atom's nucleus are significantly heavier than electrons, which have a much smaller mass. The electron cloud is created by the constantly moving electrons that surround the nucleus. They are in charge of an element's chemical and physical characteristics and are essential to chemical reactions. In order to maintain overall neutrality, atoms must have an equal number of protons and electrons. Chemical bonding, which affects the structure of compounds and the interactions between molecules, involves electrons. In addition to transferring energy in processes like heat transfer and electromagnetic radiation, they also conduct electricity.

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Answer:

34.0 mL.

Explanation:

The volume of a gas at constant temperature is inversely proportional to the pressure. We can use this relationship to find the new volume. Using the formula:

[tex]\sf:\implies{V1 \times P1 = V2 \times P2}[/tex]

where V1 and P1 are the initial volume and pressure, and V2 and P2 are the final volume and pressure, respectively.

Plugging in the given values, we get:

[tex]\sf:\implies{V2 = V1 \times P1 / P2 = 39.4 mL}[/tex]

[tex]\sf:\implies{39.4 mL \times 741 torr / 862 torr = 34.0 mL}[/tex]

So, the volume of the gas at a pressure of 862 torr is 34.0 mL.

Option A, weak acid & weak conjugate system is a best buffer system.

A weak acid and its conjugate base, or a weak base and its conjugate acid, are combined to form the buffer solution, a water-based solvent solution. Without changing the pH of the solution, they can be diluted or have small amounts of acid or alkali added to them. When a small amount of a strong acid or base is added to buffer solutions, the pH hardly changes at all. They are therefore, utilized to maintain a consistent pH level. The concentration of hydrogen ions in the buffer solution only slightly changes when a little amount of acid or base is diluted or added (pH).Buffer solutions are used in the processes of fermentation, food preservation, medicine delivery, electroplating, and printing because particular hydrogen ion concentrations are necessary for enzyme activity and the blood's ability to carry oxygen (pH).pH can be maintained by using buffer solutions, which are mixtures of a weak acid and its conjugate base or a weak base and its conjugate acid.

Acidic and alkaline buffers are the two main groups into which buffer solutions are commonly categorised.

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The number of protons, neutrons and the electrons in the Se²⁻ ion  :

Protons = 34

Neutrons = 45

Electrons = 36

The atomic number of the selenium = 34

The number of Protons = 34

The number of Neutrons = 45

The number of Electrons = 34

The number of the electrons is exactly equals to the number of the protons for the neutral atom . In the Se²⁻ ion , the selenium gains the two electrons and forms the anion. The number of protons , number of neutrons and the number of the electrons  Se²⁻ ion is as follows :

The number of Protons = 34

The number of Neutrons = 45

The number of Electrons = 36

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The balanced chemical equation will be  2Mg(s)+O₂(g)⟶2MgO(g)

A balanced chemical equation is an equation for a chemical reaction in which the number of atoms for each of the element in the reaction and the total charge are the same for both the reactant side and the products side. In other words, the mass as well as the charge are balanced on both the sides of the reaction. Chemical equations must be balanced, meaning that the number and kinds of atoms must be the same on both sides of the reaction arrow. The numbers placed in the front of formulas to balance equations are known as coefficients, and they will multiply all the atoms in a formula. For example: the symbol 2MgO; 2 atoms of magnesium and oxygen is present on both the sides of the reactant and product side. Hence the chemical reaction will obeys the law of conservation of mass so the chemical reaction will be Balanced chemical equation.

--The given question is incomplete, the complete question is

"If a chemical reaction does happen, write a balanced chemical equation for it"--

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The empirical formula is V2O5

Mass of Vanadium= 3.054g

Mass of oxygen= 5.545g

Mass of oxygen= Mass of vanadium oxide-mass of Vanadium

= 5.454g - 3.054g

=2.4g

Atomic mass of Vanadium= 50.94g

Atomic mass of oxygen= 16g

Moles of Vanadium= 3.054/50.94 = 0.0599mol

Moles of Oxygen= 2.4/16= 0.15mol

V:O= 0.0599 : 0.15

= 1 : 2.5

Multiplying by 2

= 2 : 5

Empirical formula is V2O5

What is an empirical formula?

The empirical formula of a chemical compound is the simplest integer ratio of the atoms present in the compound.

A simple example of this concept is that the empirical formula of sulfur dioxide, or SO, would simply be SO, as would the empirical formula of sulfur dioxide, S2O2.

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The number of atoms that can participate in the delocalization of electrons determines the number of resonance structures that can be drawn for a given molecule.

Resonance structures are various Lewis structures that can be depicted for a molecule to show how the electrons are distributed throughout the molecule. The total number of atoms that can take part in electron delocalization determines the number of resonance structures that are conceivable for a given molecule. Multiple resonance structures can be created to depict the various ways in which these electrons are exchanged when a molecule has multiple atoms that are able to share electrons. The number of potential resonance structures is constrained if a molecule has a small number of atoms that can take part in electron delocalization.Even though many resonance structures can be depicted, it should be noted that they don't actually exist as separate objects in the molecule. The real distribution of electrons is a mixture of the many resonance structures, whereas these structures just indicate the average distribution of electrons in the molecule.

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For the reaction, the Kc is 82.2.

We know that the reaction have been given as; COCl2(g) ⇔ CO(g) + Cl2(g). We can then know that the initial concentration of the  COCl2 =  1. 60 moles/1. 00 liter = 1.6 M

Since the equilibrium concentration is 1.57 M, the equilibrium concentration of  COCl2 =  1.6 M - 1.57 M = 0.03 M

Then the Kc is;

[CO] [Cl2]/[COCl2 ]

Kc = (1.57)^2/(0.03)

Kc = 82.2

The reaction as it has been shown here would been seen to have the Kc of 82.2

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When methanol acts as a base, its conjugate acid is formic acid (HCOOH).

In chemistry, the conjugate acid-base pairs are two species that differ by only one proton. When a species acts as a base, its conjugate acid is the species that results from the removal of a proton from the base.

In the case of methanol (CH3OH), when it acts as a base, it accepts a proton to form its conjugate acid, formic acid (HCOOH). The chemical equation for this reaction can be written as CH3OH + H+ -> HCOOH.

Formic acid is a weak acid with the chemical formula HCOOH, and it is the simplest carboxylic acid. This concept of conjugate acid-base pairs is an important aspect of acid-base chemistry and helps to understand the behavior of acids and bases in chemical reactions.

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Answer:

1- The equilibrium constant for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g) can be calculated using the concentration of the species at equilibrium:

Kc = [NH3]^2/([N2] * [H2]^3) = (0.15)^2/ (0.010 * (0.025)^3)

2- The equilibrium constant for the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g) can be calculated using the concentration of the species at equilibrium:

Kc = [SO3]^2 / ([SO2] * [O2]) = (0.06)^2 / (1.0 * 0.07)

3- The equilibrium constant for the reaction Br2(g) + Cl2(g) ⇌ 2BrCl(g) can be calculated using the concentration of the species at equilibrium:

Kc = [BrCl]^2 / ([Br2] * [Cl2]) = (0.06)^2 / (0.05 * 0.07)

4- The equilibrium constant for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g) can be calculated using the number of moles of the species at equilibrium and the volume of the vessel:

Kc = [NH3]^2/([N2] * [H2]^3) = (2/5)^2 / ((4/5) * (8/5)^3)

Answer:

Ion-Dipole interaction

Explanation:

.It is a compound that lost one electron  is true about a molecular ion .

What causes a molecular ion to form?

A mass spectrometer's ionization chamber is where the organic sample is vaporized, where it is then subjected to an electron barrage. With their tremendous energy, these electrons can dislodge an electron from an organic molecule to create a positive ion. Molecular ions are what this ion is known as.

What distinguishes molecules from ions?

The bonding of two or more atoms forms molecules, which are neutral entities. A positively or negatively charged particle is known as an ion. Molecular ions are those that are created when an electron is lost. Radical cations include the molecular ion, for instance.

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When a gas condenses into the liquid, or the solid melts into the liquid, the phase change occurs. During a phase change the heat is released.

When a gas condenses into the liquid, or the solid melts into the liquid this phase change is called the condensation. The Condensation is the process when the molecules of the gas cool down. When the molecules lose the heat, they lose the energy and will slow down. They come closer to each other gas molecules. Finally the molecules are collect together to form the liquid.

Thus, in the process of the condensation the heat energy is released.

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elementary reactions describe a process that occurs by a single collision (molecular event). if the first step in a reaction mechanism is slow, the rate law for the overall reaction will be the same as the rate law for that elementary step. the reaction mechanism must be consistent with all experimentally-derived observations, including the experimentally-derived rate law. a reaction mechanism is a proposed sequence of elementary steps. the combination of all elementary steps in a reaction mechanism must result in the overall reaction. when the rate law for an overall reaction does not correspond to the known rate-determining (slow) step, it usually means one or more fast steps precede it in the reaction mechanism.

All the above statements are true regarding elementary reactions.

If we are aware of a reaction's elementary nature, we are also aware of its rate law. The chemical equations for the elementary reactions in a multistep mechanism do not always have to add up to provide the chemical equation of the overall process because intermediate compounds can be created.

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