Which model is better and why? please help me ASAp

Quantum numbers can be shown by;

ℓ

ms

When we talk about the quantum numbers that describe an electron, we are looking at the number that can be used to show the designation of an electron in an atom. Thus the position of the electron that can be found in the atom is shown by the use of the quantum numbers.

There are four sets of quantum numbers and they are;

1) orbital quantum number (l)

2) Spin quantum number (ms)

3) Magnetic quantum number (ml)

4) Principal quantum number (n)

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The order of the reaction is zero and the rate constant is 1.67.

From the information given, the rate law expression is illustrated thus:

Rate = k.[A]x

Time (sec) Concentration (mM)

    0                           200

   60                    100

  105                    B25

After 60 sec,

Rate = -d[A]/dt

= -[100 - 200]/(60 - 0)

= 100/60 = 1.67

After 105 sec,

Rate = -d[A]/dt

= -[25 - 100]/(105 - 60)

= 75/45 = 1.67

As we can see, the rate is constant. This is constant with respect to change in the concentration of A.

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Answer:

The bond-dissociation energy is one measure of the strength of a chemical bond A−B. It can be defined as the standard enthalpy change when A−B is cleaved by homolysis to give fragments A and B, which are usually radical species

One sigma and two pi bonds make up the triple bond in the diatomic molecule of nitrogen.

As with all molecules, molecular nitrogen is made up of two nitrogen atoms triple bonded to one another. As with all molecules, this triple bonding allows the outer electron shells of the two nitrogen atoms to fill up, making the molecule more stable than the individual nitrogen atoms.

With another nitrogen atom, three of them form a triple bond (which also has five electrons in its outermost shell). Because of this, a nitrogen molecule has a triple bond between two nitrogen atoms and a lone pair on each nitrogen atom.

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Propene is a compound which has covalent bonds out of which 8 sigma bonds and 1 pi bond.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .

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The frictional force that acts on the body is shown as force D.

We know that the term friction has to do with the force that opposes the motion of a body along a surface. The magnitude of the frictional force is highly dependent on the nature of the surfaces that are in contact with each other.

In this case we have a free body diagram. The meaning of the Freebody diagram is a diagram that show all the forces that acts on a body. In this case, we can see that there are four forces that act on the body and they are the frictionl force, the moving force, the weight of the object and the normal reaction on the objject.

We can see that all the forces that are acting on the body have been labelled with a proper alphabet.

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The buffer solution's pH value is 0.18.

An aqueous solution known as a buffer is composed of a weak acid and its salt (acid buffer) or a weak base and its salt (basic buffer). It is used to prevent pH changes in solutions because, when a small amount of a strong acid or base is added to it, its pH changes very little.

Concentration of CH₃CH₂COOH= 2.00 mol dm⁻³

Volume of CH₃CH₂COOH = 200 cm³ = 200 ml

Concentration of CH₃CH₂COONa = 1.00 mol dm⁻³

Volume of CH₃CH₂COONa = 600 cm³ = 600 ml

Ka for CH₃CH₂COOH = 1.32×10⁻⁵

The following expression can be used to determine the pH of an acidic buffer solution:

pH = pKa + log [salt/acid]

We can determine the salt and acid concentrations by changing the given values in the expression above.

[Salt] = 600×1/100 = 6M

[Acid] = 200×2/100 = 4M

Change the values in the equation above.

pH = 1.32×10⁻⁵ + log [6/4]

pH = 1.32×10⁻⁵ + 0.17609

pH = 0.0000132 + 0.17609

pH = 0.1761032

pH = 0.18

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The disaccharide formed by joining two monomers of D-glucose is β-D-glucopyranosyl-(1→4)-β-D-glucopyranose. Therefore, option (A) is correct.

Glucose can be described as a monosaccharide containing six carbon atoms and an aldehyde group. Glucose can exist in an open-chain as well as ring (cyclic) form.

Glucose can be described as a sugar with the molecular formula C₆H₁₂O₆. Glucose is the most abundant monosaccharide which is a category of carbohydrates. Glucose is generally made by plants and algae during photosynthesis from water and CO₂ using energy from sunlight which is used to make cellulose in cell walls.

Glucose in energy metabolism is the most important source of energy in all organisms. Glucose for metabolism can be stored as a polymer, in plants as starch and amylopectin, and in animals as glycogen.

The naturally occurring glucose exists as D-glucose, while L-glucose is produced synthetically.  

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The characteristics of a good recrystallization solvent are;

We know that recrystallization is the process by which we can be able to remove impurities from a solute. We can obtain the solute as the product of a given reaction.

We know that there are certain properties of the solvent that would make the solvent to be sufficient as a tool for the process of recrystallization to obtain the desired results.

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Answer:

Neon is the tenth element with a total of 10 electrons. In writing the electron configuration for neon the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Ne go in the 2s orbital. The remaining six electrons will go in the 2p orbital.

Explanation:

According to the concept of chemical reaction, on addition potassium chromate to barium chloride precipitate is formed which is dissolved on addition of HCl,when this mixture is cooled at room temperature the forward reaction is endothermic.

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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One mole of aluminum oxide or Al₂O₃ is 102 g/mol  . It contains 54 g of Al metal. Thus, 25.5 tones of aluminum oxide contains 13.5 tones of Al. Therefore, the maximum mass of aluminum that can be extracted is 13.5 tones.

Aluminum is 13 the element in periodic table. It is an electropositive element and exhibit metallic properties. Aluminum easily forms its oxides by reacting with atmospheric oxygen.

The molar mass of aluminum oxide Al₂O₃ is 102 g/mol. The atomic mass of Al is 27 g/mol. Thus 102 g of Al₂O₃ contains 54 g of Al. Therefore, the mass of Al in 25.5 tones or 25.5 ×10⁶ g of Al₂O₃ is calculated as follows:

mass of Al = (25.5 ×10⁶ g × 54 g) / 102 g

                  = 13.5  ×10⁶ g = 13.5 tones.

Therefore, the maximum mass of aluminum that can be extracted is 13.5 tones

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The first crystal structure is HCP (hexagonal closest-packed)

The second crystal structure is FCC (face-centered cubic)

The third crystal structure is BCC ((body-centered cubic)

The 4th crystal structure is  simple (simple cubic)

The unit cell can be described as the smallest repeating unit of the crystal lattice or the building block of a crystal.

The unit cells are all identical and are defined as they fill space without overlapping. The 3-Dimensional arrangement of atoms, molecules, or ions inside a crystal is known as a crystal lattice.

The crystal lattice is composed of numerous unit cells. A unit cell can either be simple cubic, body-centered cubic (BCC), or face-centered cubic (FCC). The simple cubic has a total of one atom in it. The BCC cubic has a total of two atoms in it. The FCC and HCP have a total of six atoms in them.

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Answer:

b. i)

[tex]MgSO_{4} + 2NaOH ---- > Mg(OH)_{2} + Na_{2}SO_{4}[/tex]

try balancing Sodium first. There's 2 Sodium on the product side. So multiply 2 with NaOH, then you'll see the that there are equal no. of Na and OH on both sides so the equation is balanced

ii) Using the solubility table, we see that when OH- bonds with a metal, in most cases it would produce insoluble product i.e. precipitate. So Mg(OH)2 will form precipitate.

iii. it's a redox reaction. It can also be called a substitution reaction & precipitation reaction.

iv. (SO4)2- produces aqueous solution. NaOH is soluble in water unlike the group 2 metal hydroxides. So the reaction would be

[tex]MgSO_{4}(aq) + 2NaOH(aq) ---- > Mg(OH)_{2}(s) + Na_{2}SO_{4}(aq)[/tex]

c. Iron(II) chloride = Fe(Cl)2

Sodium Carbonate = NaHCO3

Reaction:

[tex]FeCl_{2} + Na_{2}CO_{3} ---- > FeCO_{3} +2 NaCl[/tex]

The balanced chemical reaction equation is; [tex]MgSO_{4} (aq) + 2NaOH (aq) ----- > Mg(OH)_{2} (s) + Na_{2} SO_{4} (aq)[/tex]. This is a double replacement reaction and the magnesium hydroxide is insoluble in water.

We know that sometimes, when we mix two reactants that are in the aqueous state, we do get a product that is in the solid state. This implis that the intrecation between the reactants has given rise to an insoluble product. An insoluble product is a product that would not dissolve in the reaction system.

We know that the hydroxides of the alkaline earth metals are insoluble in water according to the solubility rules. Recall that the solubility rules tells us the kind of interactions that could lead to an insoluble product.

This reaction is an example of a double replacement reaction and the equation of the reaction can be shown as; [tex]MgSO_{4} (aq) + 2NaOH (aq) ----- > Mg(OH)_{2} (s) + Na_{2} SO_{4} (aq)[/tex]

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Based on the information in the table above,  the best hypothesis regarding the properties of the compounds that can form from the given ions is option B. MgO forms the strongest ion-dipole interactions in aqueous solution.

Magnesium and oxygen have very different electronegativity properties. So instead of creating covalent bonds, they create ionic bonds.

Magnesium oxide is an ionic compound, meaning the elements are arranged in a lattice and are attracted to one another by extremely potent electrostatic interactions.

Since magnesium oxide is primarily ionic, there is a noticeable difference in the electronegativity of magnesium and oxygen. The interionic connections between Mg²⁺ and O²⁻ will be quite strong.

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The volume of the given gas is 5.35 L.

Here we use the combined gas law viz. P1V1/T1 = P2V2/T2, which is  derived from the ideal gas equation PV = nRT, where

PV = nRT

where,

P = pressure

V = volume

n = no. of moles

R = gas constant = 0.0821 L atm/mol K

T = temperature.

Here,

[tex]$P_1[/tex] = 1.40 atm, [tex]$P_ 2[/tex]= 0.989 atm  

[tex]$V_1[/tex] = 3.70 L, [tex]$V_2[/tex] = ?

[tex]$T_1[/tex] = 12.20°C = (12.20 + 273) K = 285.2 K  

[tex]$T_2[/tex] = 20.80°C = (20.80 + 273) K = 293.8  K

substituting the values in the equation  P1V1/T1 = P2V2/T2, we get,

(1.40 x 3.70)/285.2 = 0.989 x [tex]$V_2[/tex]/293.8

[tex]$V_2[/tex] = (1.40 x 3.70 x 293.8) / (285.2 x 0.989)

[tex]$V_2[/tex] = 1521.884 / 284.211

[tex]$V_2[/tex] =5.35 L

Thus, the volume of the gas is 5.35 L.

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The statement that Jacinta can correctly make about the chemical properties of non-metals is:

Non-metals react only with other non-metals. ​; option D.

Elements are substances that cannot be split into simpler substances by an ordinary chemical process. Hence, elements are the basic building blocks of all matter.

Elements are classified into three types:

Metals are shiny hard substances that are able to conduct heat and electricity.

Metalloids have a mix of the properties of metal and non-metals. For example, metalloids are not shiny but they are able to conduct electricity.

Non-metals are elements that are usually soft and which do not conduct heat and electricity. Non-metals usually exist in the form of gases. Examples of non-metals are the elements present in the substances that are involved in breathing, that is, oxygen gas, water vapor, and carbon dioxide. The elements are oxygen, hydrogen, and carbon.

These elements react with each other chemically to form compounds.

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Complete question:

Jacinta is learning about the chemicals involved in breathing. Oxygen gas, water vapor, and carbon dioxide are all compounds formed by chemical reactions between nonmetal elements. Which statement can Jacinta correctly make about the chemical properties of nonmetals?

A. Many nonmetals react with both metals and nonmetals.

B. Nonmetals are poor conductors of heat and electricity.

C. Many nonmetals are gases at room temperature.

D. Nonmetals react only with other nonmetals. ​

The charge +2 on the ions of Mg and Ba.

The charge of +1 on the ions of Li and K.

The charge -1 on the ions of Br and I.

The charge -2 on the ions of O and S.

An ion can be described as a chemical specie that holds a positive charge or negative charge. The term ‘ion’ is usually referred to atoms or molecules with non-zero net charges on them. Therefore, all ions contain either a greater number of electrons than protons or a greater number of protons than electrons.

If the number of protons in an atom is greater than electrons then the ion will hold a net positive charge and is referred to as a cation. The ions that contain greater electrons than protons then they will hold a net negative charge and are called anions.

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The feature of the Benedict's test that corresponds to the reducing sugar concentration is the intensity of the color.

Reducing sugars are sugars that are able to act as reducing agents by giving up one or more free electrons.

Reducing sugars have a free aldehyde or ketone group in their molecule.

Reducing sugars are usually all monosaccharides and disaccharides except sucrose.

Examples of reducing sugars are:

Reducing sugars reduce reagents such as Fehling solution and Tollen's reagent.

A test for reducing sugars is Benedict's test.

In Benedict's test, Benedict's solution is added to the sugar and heated in a water bath, A change in color from blue to green or yellow or orange, or red within three minutes indicates a positive Benedict test presence of reducing sugar in the sample. The intensity of the color corresponds to the concentration of the reducing sugar.

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From the solubility curve, it is clear that 84 g of potassium nitrate can be dissolved in 100 g of water at 50°C.

Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.

The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.

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Iron is more denser, due to its tightly packed particles and little volume occupied, which results in a very high density.

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Answer:

[tex]\huge\boxed{\sf Option\ D.}[/tex]

Explanation:

[tex]\rule[225]{225}{2}[/tex]

Acid base reaction. H2S - acid and NaHCO3 - base

Lead oxide is act as oxidizing agent and ammonia is act as reducing agent. 3PbO + 2NH₃ ⇒ 3Pb + N₂ + 3H₂O. This is a balance chemical equation.

A chemical equation is said to be balanced if the quantity of each kind of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.

To match up the amount of atoms in the reactants and products, a chemical equation must be balanced. Following the rule of conservation of mass requires that a chemical equation be balanced. The balance of a chemical equation is disregarded by the rule of conservation of mass.

Thus, 3PbO + 2NH₃ ⇒ 3Pb + N₂ + 3H₂O. This is a balance chemical equation.

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Taking into account the definition of enthalpy of a chemical reaction, 107.94 kJ is produced  when 7.25g of MgO is formed.

The enthalpy of a chemical reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction at constant pressure.

The enthalpy is an extensive property, that is, it depends on the amount of matter present.

In this case, the balanced reaction is:

2 Mg + O₂ → 2 MgO + 1200 kJ

This equation indicates that when 2 moles of Mg reacts with 1 mole of O₂, 2 moles of MgO are formed and 1200 kJ of heat is released.

If 7.25g of MgO is formed and being the molar mass of MgO 40.30 g/mole, the moles of MgO formed is calculated as:

moles of MgO= 7.25 g÷ 40.30 g/mole

moles of MgO= 0.1799 moles

When 0.1799 moles of MgO is formed, then you can apply the following rule of three: if 2 moles of MgO are formed when 1200 kJ of heat is released, 0.1799 moles of MgO are formed when how much heat is released?

heat= (0.1799 moles of MgO× 1200 kJ)÷ 2 moles of MgO

heat= 107.94 kJ

Finally, 107.94 kJ is produced.

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The act of repeatedly carrying out a task is known as repetition. Replication is the capacity of a procedure to be replicated by another person in the exact same way.

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According to Newton's Third Law of Motion, The force the child applies on the boat same force that is applied to the child.

The third regulation states that for every movement (force) in nature there is the same and contrary reaction. If item A exerts a force on object B, object B also exerts an identical and contrary force on item A. In different phrases, forces result from interactions.

The swimmer whilst swimming pushes in opposition to the pool wall along with his feet and in return hurries up (swims) inside the course contrary to that of his push. Newton's third law of motion states that for each movement, there may be the same and contrary reaction.

The third law states that for each motion (pressure) in nature there is a same and contrary reaction. If object A exerts pressure on item B, object B also exerts an identical and contrary pressure on object A.

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The compound from the list that will not be a strong electrolyte would be HF.

Electrolytes are chemical substances that conduct electricity in molten or aqueous forms.

Substances that conduct electricity in molten or aqueous forms can be grouped into two categories, namely:

Strong electrolytes completely dissociate into their respective component ions in molten or aqueous forms.  For example, HCl completely dissociates in aqueous forms as follows:

[tex]HCl (aq) --- > H^+ (aq) + Cl^- (aq)[/tex]

On the other hand, weak electrolytes only partially ionize into their component ions in molten or aqueous forms. For example, HF will ionize in water only to a small extent because it is a weak acid. Only a few ions are present in the aqueous molten forms.

Thus, considering all the compounds given in the option, the one that would not be a strong electrolyte is HF.

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