The first atomic structure *
Yes
NO

The different possible ways of arranging the particles of a system are called states. The greater the number of these states, the higher the entropy of the system.

By ascribing definite values to a satisfactory amount of variables, one can define the state of a system. In simple terms, it is the description of a system condition in terms of properties that are measurable or observable, for example, pressure, temperature, etc.

Entropy is a measure of the disorder or randomness in a system, and an increase in the number of states corresponds to an increase in entropy. The S.I. unit for entropy is joules per kelvin. Entropy is a measurable physical property. In a thermodynamic system, it is an extensive property.

Example: There is an increase in entropy when a block of ice melts.

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The correct option is (A) - This Bohr Model of atom describes that there are a total of 6 electrons in the given figure.

The electrons are positioned in circular orbitals at particular distances from the central nucleus in the Bohr model of the atom. These orbits create electron shells or energy levels, which allow us to see how many electrons are present in each shell. The number and the letter "n" are used to identify these energy levels. The first energy level nearest to the nucleus, for instance, is represented by the 1n shell. Normally, an electron resides in the shell with the lowest energy, which is the one closest to the nucleus. A photon of light's energy can raise it to a higher energy shell, but this is an unstable position, and the electron quickly returns to the ground state.

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The yield of the response is 245.6% and the number of moles of H2SO4 is 0.09849 moles.

To decide the yield of the response, we first need to ascertain how much \(H2SO4\) created:

Volume of H2SO4 = 20.1 mL = 0.0201 L

Grouping of H2SO4 = 4.9 M

Measure of H2SO4 = \(fixation x volume\) = \(4.9 M x 0.0201 L = 0.09849\) moles

We realize that the response is:

\(SO3(g) + H2O(l) → H2SO4(aq)\)

The decent condition lets us know that 1 mole of SO3 responds with 1 mole of H2O to create 1 mole of H2SO4. Hence, the hypothetical yield of \(H2SO4\) would be 0.0401 moles (since 40.1g of SO3 is comparable to 0.4 moles of SO3).

The genuine yield is given  \(H2SO4\) created, which is 0.09849 moles.

The yield of the response is then, at that point:

Yield = \((genuine yield/hypothetical yield) x 100 percent\)

= \((0.09849 moles/0.0401 moles) x 100%\)

= 245.6%

Subsequently, the yield of the response is 245.6%.

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A photon has an energy of 2.88 × 10⁻¹⁸ J. The energy into eV is 17.97 eV.

The energy which is carried by a single photon is called Photon energy.

It is expressed as:

E = hf

where,

E = Photon energy

h = Planck's energy

f = Wave frequency

To convert J into eV

E(eV) = E(J) × 6.241509 × 10¹⁸

         = 2.88 × 10⁻¹⁸ × 6.241509 × 10¹⁸

         = 17.97 eV

Thus from the above conclusion we can say that A photon has an energy of 2.88 × 10⁻¹⁸ J. The energy into eV is 17.97 eV.

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The concentration of solution after dilution comes out to be 0.113 M as shown in the below section.

Using the dilution law, the concentration of the solution can be calculated as follows-

M₁ x V₁ = M₂ x V₂ ......(1)

Here, M signifies the concentration and V represents the volume.

It is given,

V₁ = 25 mL

V₂ = 100 mL

M₁ = 0.452 M

To calculate the concentration/molarity of solution on dilution, substitute the above values in the equation (1) as follows-

0.452 M x 25 mL = M2 x 100 mL

M2 = (0.452 M x 25 mL) / 100 mL

M2 = 0.113 M

Therefore, the concentration of solution after dilution comes out to be 0.113 M.

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Shielding is a term used to describe the ability of inner electrons to shield or reduce the effective nuclear charge (Zeff) experienced by the valence electrons in an atom.

The number of valence electrons and the outermost energy level (also known as the primary quantum number or n value) are the same for all elements in a periodic table group (or column). This indicates that the valence electrons in all of the group's atoms have comparable energy levels and shielding effects from the inner electrons. As a result, the number of energy levels, or the primary quantum number (n), and the shielding effect of the inner electrons dictate the trend in atomic radius within a group.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question

density = 5 g/cm³

volume = 20 cm³

We have

mass = 5 × 20 = 100

We have the final answer as

Hope this helps you

Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

There are several steps to draw lewis dot structure of any chemical compound. Here, we taking RbF.  Structure is given below with the image.

1. Start by writing the chemical symbol for the element at the center of the structure. In this case, it is Rb for Rubidium.

2. Draw dots around the symbol to represent the valence electrons. Rb has one valence electron, so you would put one dot around the Rb.

3. Next, write the chemical symbol for the other element in the compound, in this case F for Fluorine.

4. Draw dots around the symbol to represent the valence electrons. Fluorine has 7 valence electrons, so you would put 7 dots around the F.

5. To create the bond between the two elements, use a pair of dots to connect the Rb and F. This represents the sharing of electrons between the two elements.

So the Lewis dot structure for RbF would be represented as:

        . .

Rb+ [:F:]

        . .

This representation shows that Rb and F share one pair of electrons, forming a bond between them, and the dots around Rb and F represent the remaining number of valence electrons that are not involved in the bond.

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There would be 5 half-lives

The half-life of an isotope is the amount of time it takes for half of the atoms of a radioactive isotope to decay into another isotope or element. It is a characteristic property of a specific isotope and does not depend on the amount of the material present.

The half-life of a radioactive isotope is a constant that can be used to measure the age of minerals and rocks, as well as to track the progress of nuclear reactions and to diagnose and treat certain medical conditions.

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The molecular formula for hydrate has been, CaCl₂.2H₂O.

The molecular formula is given as the representation of the compound with the number of atoms of each element.

The hydrate has a mass of 4.72 g. The anhydrous has a mass of 3.56 g. The mass of water will be:

Mass of water = Mass of hydrate - Mass of anhydrate

Mass of water = 4.72 g - 3.56 g

Mass of water = 1.18 grams

The moles of calcium chloride in 4.72 grams are:

Moles = Mass/ Molar mass

Moles of Calcium chloride = 4.742 g / 110.98 g/mol

Moles of Calcium Chloride = 0.0321 mol

The moles of water in 1.18 grams are :

Moles of water = 1.18 g / 18 g/mol

Moles of water = 0.0655 mol

The ratio of calcium chloride to water in the compound will be:

Calcium chloride / water = 0.0321 / 0.0655

Calcium chloride / water = 2 / 1

Thus, the molecular formula for hydrate has been, CaCl₂.2H₂O.

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The standard reaction enthalpy for the given reaction is +235.8 kJ/mol.

The standard reaction enthalpy (ΔH°) for the given reaction is determined as follows:

Equation of reaction: 3 Fe₂O₃ (s) → 2 Fe₃O₄ (s) + ½ O₂ (g)

The standard enthalpy of formation values for Fe₂O₃ (s), Fe₃O₄(s), and O₂(g) is used to calculate the standard reaction enthalpy.

ΔH° = [2 × ΔH°f(Fe₂O₃)] + [½ × ΔH°f(O₂)] - [3 × ΔH°f(Fe₃O₄)]

where;

ΔH°f(Fe₂O₃) = -824.2 kJ/mol

ΔH°f(Fe₃O₄) = -1118.4 kJ/mol

ΔH°f(O₂) = 0 kJ/mol

ΔH° = [2 × (-1118.4 kJ/mol)] + [½ × 0 kJ/mol] - [3 × (-824.2 kJ/mol)]

ΔH° = -2236.8 kJ/mol + 0 kJ/mol + 2472.6 kJ/mol

ΔH° = 235.8 kJ/mol

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Answer:

solute

Explanation:

solvent is the water solution is the whole mixture product is the solution

A.  a solute

B.  a solvent

C.  a solution

D.  a reactant

E.  a product

Answer:

The correct option is A

Explanation:

The forces of attraction among the molecules or atoms of a substance are called inter molecular forces.

When two atoms gain temporary dipole and become polar for an instant the inter molecular forces of attraction between then are known as London dispersion forces.

London Dispersion Forces:

It is a type of inter molecular force that occurs when the electrons in two adjacent atoms are displaced in such a way that the atoms get some temporary dipoles, they attract each other through London dispersion forces. These inter molecular forces usually occur between non polar substances.

Answer: B intramolecular force

Explanation:

Answer:

The answer is C for sure!

Explanation:

In the picture we have the electrons given, so we have to determine the nucleons and protons.

Answer:

True

Explanation:

Friction is defined as the force that opposes motion when an object is sliding over a surface.

As a result of friction, all objects moving over a surface eventually come to rest over time.If we were to successfully create a friction-less surface, an object will remain in motion forever because it will encounter no opposition to its motion.

Hence, the resistance to the motion of objects over  a surface which causes the objects to come to a halt after moving over the surface for some time is called friction.

Answer:

DNA bases pair up with each other, A with T and C with G, to form units called base pairs. Each base is also attached to a sugar molecule and a phosphate molecule. Together, a base, sugar, and phosphate are called a nucleotide. Nucleotides are arranged in two long strands that form a spiral called a double helix.

Answer:

Graphite

Graphite is a non-metal and it is the only non-metal that can conduct electricity.

Chemical substances with opposing characteristics include acids and alkalis. Alkalis have a pH above 7, while acids have a pH below 7.

Acids are dangerous when there is moisture in the mouth, eyes, or surrounding aqueous solutions because they react violently with water. Certain acids' vapours can harm the eyes, nasal passages, throat, and lungs since they are soluble in water.

Working with acids and bases poses health risks mostly because of their corrosivity, which causes tissue to be destroyed. The pernicious characteristic of hydrofluoric acid, or HF, which causes severe loss of skin without providing any burning sensation.

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Question:

What are the potential dangers associated with acids and alkalis?

With the exception of (a), all of the following statements regarding lighteners are true.

Melanin, a pigment made by skin cells, is what gives skin their colour. The skin cells may produce far to much melanin if they are sick or injured. There might be a melanin deposition there, darkening it up. Fading could take a while after the dark spots and patches' root causes have been identified and eliminated. An area that is just a few shades darker than you natural skin color takes 6 to 12 months to heal on average. Blue-gray-appearing hyperpigmentation in the dermis may last a long time or become permanent if addressed.

Lightweight Anti-Pigmentation Serum: Clinical studies have shown that the advanced skin-lightening ingredient Alpha Arbutin, which is included in this de pigmentation serum, reduces hyperpigmentation and blemishes.

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Answer:

1. FeO

2.

3. Ba(NO3)2

4. Ca(OH)²

Explanation:

sorry I didn't knew of no 2 the others were on my book but not that one, and of no 4 the power 2 must be down

Answer: False

Explanation: Endothermic means it absorbs heat energy.

Answer:

Explanation:

Melting and boiling point variations are not clear (do not have uniform pattern) in periodic table. But we can see, some elements have higher melting and boiling points and some have less. Here we study melting and boiling points of s, p, d blocks elements. IVAth group elements (C,Si) show high melting and boiling points because they have covalent gigantic lattice structures.

The net ionic equation is:

2Ag⁺(aq) + 2Cl⁻(aq) → 2AgCl(s)

The given equation is:

2AgNO₃ (aq) + CaCl₂ (aq) → 2AgCl(s) + Ca(NO₃)₂ (aq)

A double displacement reaction occurs when silver nitrate and calcium chloride are combined. Silver chloride precipitate and a calcium nitrate solution are the results of the reaction.

Break down all the soluble electrolytes, that are present in an aqueous form, into their respective ions:

2Ag⁺(aq) + 2NO³⁻(aq) + Ca²⁺(aq) + 2Cl⁻(aq) → 2AgCl(s) + Ca²⁺(aq)+ 2NO³⁻(aq)

Now remove all the spectator ions present in the equation. The spectator ions should be removed after comparing the reactant and product sides of the revised reaction. These dissolved ions are known as spectator ions if they exhibit the same form on both sides. No reaction occurs if everyone is a spectator ion.

Now write the net ionic equation:

2Ag⁺(aq) + 2Cl⁻(aq) → 2AgCl(s)

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The second reaction, C2H6(g) + 5O2(g) → 2 CO2(g) + 3 H2O(g), is least likely to be an elementary step in a reaction mechanism. This is because it involves the simultaneous collision of seven molecules, which is very unlikely to occur in a single step.

Elementary steps usually involve the collision of one or two molecules, or the breaking or formation of a bond between two atoms or molecules. The other reactions listed all involve one or two molecules colliding, or the breaking or formation of a bond between two atoms or molecules, and are more likely to be elementary steps in a reaction mechanism.

This is because the probability of multiple molecules colliding simultaneously is lower than that of a single molecule colliding with another molecule.

Therefore, the second reaction listed, C2H6(g) + 5O2(g) → 2 CO2(g) + 3 H2O(g), is least likely to be an elementary step in a reaction mechanism due to the large number of particles involved in the collision. Instead, this reaction is likely to proceed through a series of multiple elementary steps that involve the sequential breaking and formation of multiple bonds between atoms and molecules.

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