how many equivalents of mg2 mg 2 are present in a solution that contains 2.50 mol of mg2 mg 2 ?

Answer: There are approximately 141.7 moles

Explanation:

To convert the number of molecules of a substance to the number of moles, we need to divide the number of molecules by Avogadro's Number, which is approximately 6.022 x 10^23 molecules per mole.

Therefore, to calculate the number of moles in 8.52 x 10^33 molecules of carbonic acid (H2CO3), we can use the following formula:

Number of moles = Number of molecules / Avogadro's Number

Number of moles = 8.52 x 10^33 / 6.022 x 10^23

Number of moles = 141.7 mol

Therefore, there are approximately 141.7 moles of carbonic acid in 8.52 x 10^33 molecules of carbonic acid.

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The Bohr model is a representation of the electronic configuration of the atom. According to this model, each energy level can hold a certain number of electrons. In the first energy there can only be 2 electrons, in the second and the following energy levels there can be a maximum of 8 electrons.

Sodium, Na which has 11 electrons in total so in the first level it will have two electrons, in the second level it will have 8 electrons and in the third level it will have the missing electron.

In the model proposed by the student, the electrons are represented in blue. The model proposed by the student is incorrect.

We see that in the second energy level he drew 9 electrons, this is incorrect since from the second energy level there can only be 8 electrons, the remaining electron must be located in the third energy level.

Answer:

1 valence electron - group 1

4 valence electrons - group 14

8 valence electrons - group 18

3 valence electrons - group 13

Explanation:

Elements are placed in the periodic table according to the number of valence electrons in their outermost shell.

Hence,  all elements in the same group have the same number of outermost shell electrons.

Group 1 elements have only one valence electron, group 14 elements have 4 valence electrons, group 13 elements have 3 valence electrons while group 18 elements have 8 valence electrons.

Answer:

3A: c

7A: d

1A: b

6A: f

2A: e

5A: a

Explanation:

3A: needs to -3 electrons to be stable, so +3 charge

7A: needs to +1 electrons to be stable, so -1 charge

1A: needs to -1 electrons to be stable, so +1 charge

6A: needs to +2 electrons to be stable, so -2 charge

2A: needs to -2 electrons to be stable, so +2 charge

5A: needs to +3 electrons to be stable, so -3 charge

ALL 8A ELEMENTS ARE STABLE, THEY HAVE THEIR VALENCE SHELL FULLY FILLED

The type of ion it will form is; 1) 3A needs +3 ions: Option C 2) 7A needs -1 charge: Option D 3) 1A needs +1 charge: Option B 4) 6A needs -2 charge: Option F 5) 2A needs +2 charge: Option E 6) 5A needs -3 charge: Option A.

The ion formation for each group based on their electron configurations and valence electrons.

3A (Group 13): Elements in Group 3A of the periodic table have three valence electrons. To achieve a stable electron configuration, they tend to lose three electrons to attain a full valence shell. Losing electrons results in a net positive charge, specifically a +3 charge.

7A (Group 17): Elements in Group 7A, also known as the halogens, have seven valence electrons. They tend to gain one electron to achieve a full valence shell, leading to a net negative charge of -1.

1A (Group 1): Elements in Group 1A, or the alkali metals, have one valence electron. They have a strong tendency to lose this one electron to achieve a full valence shell, resulting in a net positive charge of +1.

6A (Group 16): Elements in Group 6A have six valence electrons. They tend to gain two electrons to achieve a full valence shell, resulting in a net negative charge of -2.

2A (Group 2): Elements in Group 2A, known as the alkaline earth metals, have two valence electrons. They tend to lose these two electrons to achieve a full valence shell, resulting in a net positive charge of +2.

5A (Group 15): Elements in Group 5A have five valence electrons. They tend to gain three electrons to achieve a full valence shell, leading to a net negative charge of -3.

Therefore, the charges of the ions formed by each group are determined by their tendency to gain or lose electrons to achieve a full valence shell, following the octet rule.

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Using the change of base rule to find the logarithm to four decimal places. the correct answer is 11.4235.

To find the logarithm of 143.2 using the change of base rule, we can choose any base we prefer. Let's use base 10 and natural logarithm (base e) for this calculation.

First, we'll use the change of base formula, which states that log(base b) x = log(base c) x / log(base c) b. In this case, we'll calculate log(base 10) 143.2.

We'll use the natural logarithm (ln) as our intermediary step. The natural logarithm of 143.2 can be calculated as ln(143.2).

Using a calculator, we find that ln(143.2) is approximately 4.9628.

Next, we need to calculate log(base 10) e, which is the logarithm of e with base 10. Using a calculator, we find log(base 10) e is approximately 0.4343.

Finally, we apply the change of base formula:

log(base 10) 143.2 ≈ ln(143.2) / log(base 10) e
                ≈ 4.9628 / 0.4343
                ≈ 11.4235

Rounding to four decimal places, the logarithm of 143.2 using base 10 is approximately 11.4235.

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Molecules are compounds that make covalent bonds between atom. In a covalent bond, the electrons from each atom invoved are shared between them, sticking the atoms together.

In ionic compounds, the electrons of each atoms are not shared, they are part of either of the ions. The ions sticke together because they are charged with opposite charges, so they attract each other.

So, ionic compounds are not considered individual molecules because they don't make covalent bonds, that is, their atoms don't shared electrons, they attract each other because of their opposite charges.

the general formular is cnH2n-2

Answer:

Pb(OH)4 + 2Cu2O → PbO2 + 4CuOH  

Explanation:

Pb(OH)4 + Cu2O --> PbO2 + CuOH

The end goal of balacing chemical equations is to make sure there is no gain or loss of atoms of elements. Number of atoms of elements in the left side (reactant) must balance with the right side (product) of the reaction.

Currently, the number of Cu, H and O atoms are not balanced.

Pb

Reactant = 1, Product = 1

O

Reactant = 5, Product = 3

Cu

Reactant = 2, Product = 1

H

Reactant = 4, Product = 1

The balanced equation is given as;

Pb(OH)4 + 2Cu2O → PbO2 + 4CuOH  

Pb

Reactant = 1, Product = 1

O

Reactant = 6, Product = 6

Cu

Reactant = 4, Product = 4

H

Reactant = 4, Product = 4

The pH of the solution is approximately 4.62.

The pKa of acetate is 4.76. To find the pH of the solution, we need to calculate the concentrations of acetic acid and sodium acetate, and then use the Henderson-Hasselbalch equation.

First, we calculate the moles of acetic acid (0.150 L x 1.1 M = 0.165 moles) and sodium acetate (0.175 L x 0.6 M = 0.105 moles).

Next, we calculate the concentrations of acetic acid and acetate ions (0.165 moles / 0.325 L = 0.508 M and 0.105 moles / 0.325 L = 0.323 M, respectively).

Now, we can plug these values into the Henderson-Hasselbalch equation:

pH = pKa + log10([acetate]/[acetic acid]) = 4.76 + log10(0.323/0.508) ≈ 4.76 - 0.14 = 4.62.

Therefore, the pH of the solution is approximately 4.62.

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Answer:

option c

enzymes are protein molecules that act as catalysts to speed up bio chemical reactions

Answer:

Chemists make observations on the macroscopic a scale that lead to conclusions about microscopic features

Explanation:

Many important chemical observations are made on the macroscopic scale. This is because, many of the scientific equipments available are not presently able to provide direct evidence about microscopic processes. Evidences obtained from macroscopic observations could serve as important insights into the nature of certain microscopic processes.

This is evident in the study of the structure of the atom. Most of the evidences that led to the deduction of the atomic structure were obtained from macroscopic evidence but ultimately provided important information about the microscopic structure of the atom.

Answer:

mesosphere and thermosphere

Explanation:

The produced at the anode in the electrolysis of molten CuF2 is A. F₂.

During electrolysis, CuF₂ will separate into Cu₂⁺ cations and F⁻anions. Cu₂⁺ will be reduced to copper metal, which will deposit on the cathode, whereas F⁻ anions will be oxidized to fluorine gas on the anode in the electrolysis of molten CuF₂. Hence, the answer is option A. Fluorine gas (F₂) is generated at the anode in the electrolysis of molten CuF₂.

Therefore, during the electrolysis of molten CuF₂, Cu₂⁺ is reduced to copper metal, which deposits on the cathode, and F⁻ anions are oxidized to fluorine gas on the anode, which is produced at the anode. The chemical reactions taking place during electrolysis of CuF₂ are given below: At the cathode, Cu₂⁺ cations get reduced to copper metal. Cu₂⁺ + 2e⁻ ⟶ Cu. At the anode, F⁻ anions get oxidized to fluorine gas. 2F⁻ ⟶ F₂ + 2e⁻. Therefore, option A is correct.

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Answer:

combining iron, carbon and transition metals such as chromium and nickel.

Explanation:

Steels are alloys of iron and carbon. Steel is hard, tough and strong. The amount of carbon present in varies between 0.1 and 1.5% and it determines the hardness of steel. The higher the carbon content, the harder the steel produced. Also, the amount of heat treatment as well as presence of other elements determines the properties of steel produced.

Steel can be combined with other elements such as nickel, chromium, and manganese to produce various other alloys of steel . These alloys have various desirable properties than ordinary steel such as resistance to corrosion, high tensile strength and luster.

Answer:

When the number of electrons does not equal the number of protons, the atom is ionized and then they are no longer atoms, they are known as ion(s).

Answer:

69Ga=68.925580(3),71Ga=70.9247005(3)

We need the structure (Refer to the attachment)

Answer:

Its will particles move faster and its temperature will rises more.

Explanation:

The moment of inertia of the molecule is approximately 2.595 × 10^(-46) kg m^2.

The greatest wavelength of the radiation of ≈ 1.998 × 10^13 m can excite the molecule into rotation.

a) The moment of inertia of the molecule can be calculated using the reduced mass of the system. The reduced mass (μ) is given by the formula:

μ = (m1 * m2) / (m1 + m2)

where m1 and m2 are the masses of the atoms. In this case, m1 represents the mass of the hydrogen atom (H) and m2 represents the mass of the iodine atom (I).

The atomic mass of hydrogen (H) is approximately 1.00784 atomic mass units (u), and the atomic mass of iodine (I) is approximately 126.90447 u.

μ = (1.00784 u * 126.90447 u) / (1.00784 u + 126.90447 u)

≈ 1.00136 u

The moment of inertia (I) can then be calculated using the formula:

I = μ * r^2

where r is the distance of the hydrogen atom from the iodine atom.

Given r = 161 pm = 161 × 10^(-12) m, we can substitute the values into the formula:

I = (1.00136 u) * (161 × 10^(-12) m)^2

≈ 2.595 × 10^(-46) kg m^2

Therefore, the moment of inertia of the molecule is approximately 2.595 × 10^(-46) kg m^2.

(b) The greatest wavelength of the radiation that can excite the molecule into rotation can be determined using the formula:

λ = (2π * c) / (ΔE)

where λ is the wavelength of the radiation, c is the speed of light (approximately 3.00 × 10^8 m/s), and ΔE is the energy difference between the initial and final rotational states of the molecule.

In this case, we need to determine the energy difference required to excite the molecule into rotation. For a diatomic molecule, the rotational energy levels are given by the formula:

E = (h^2 / (8π^2 * I)) * J * (J + 1)

where h is Planck's constant (approximately 6.626 × 10^(-34) J·s) and J is the quantum number representing the rotational state.

To find the energy difference, we subtract the energy of the initial state (J = 0) from the energy of the final state (J = 1):

ΔE = E(J = 1) - E(J = 0)

= [(h^2 / (8π^2 * I)) * 1 * (1 + 1)] - [(h^2 / (8π^2 * I)) * 0 * (0 + 1)]

= (h^2 / (8π^2 * I)) * 2

Substituting the value of the moment of inertia (I) calculated in part (a), we have:

ΔE = (6.626 × 10^(-34) J·s)^2 / (8π^2 * 2.595 × 10^(-46) kg m^2)

≈ 3.158 × 10^(-21) J

Now we can calculate the greatest wavelength (λ) using the formula:

λ = (2π * c) / (ΔE)

λ = (2π * 3.00 × 10^8 m/s) / (3.158 × 10^(-21) J)

≈ 1.998 × 10^13 m

Therefore, the greatest wavelength of the radiation of ≈ 1.998 × 10^13 m can excite the molecule into rotation.

Therefore,the moment of inertia of the molecule is approximately 2.595 × 10^(-46) kg m^2.

The greatest wavelength of the radiation of ≈ 1.998 × 10^13 m can excite the molecule into rotation.

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A total of 40 ml of titrant was required to reach a pOH of 9.00.  

6.25× 10⁻¹³ is the Kb of the conjugate base to the weak acid.

The identification of the weak acid is the first step in solving this issue. Given that the pOH is 9.00, we may get the pH as follows:

pH + pOH = 14.00

pH = 14.00 - 9.00 = 5.00

We may formulate the dissociation reaction as follows because we know that the weak acid must partially dissociate because the solution is acidic:

A- + H₃O+ = HA + H₂O

where A- is the conjugate base of the weak acid, denoted by the symbol HA.

According to the equation for the weak acid's dissociation, [A-] = [NaOH added] = 0.004 mol/L.

The weak acid's conjugate base is A-, and the following equation relates its Kb (base dissociation constant) to Ka:

Kw = Ka * Kb

where Kw (1.0 ×10⁻¹⁴ at 25°C) is the water ion product constant. Calculating Kb:

Kw = Kb = 1.0 ×10⁻¹⁴/ 0.016 = 6.25× 10⁻¹³

Therefore, 6.25× 10⁻¹³ is the Kb of the conjugate base to the weak acid.

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Answer:

B

Explanation:

The heated atmosphere cause glaciers and ice caps to melt causing the sea level to rise

Answer:

Rising temperatures melt more glaciers and polar ice caps, which add water to the ocean.

Explanation:

Answer:

Astatine: Halogen

Nitrogen: Non-Metal

Krypton: Non-Metal, Noble Gas

Chlorine: Non-Metal

Sulfur: Non-metal

Explanation:

Answer:

The difference between mass and weight is that mass is the amount of matter in a material, while weight is a measure of how the force of gravity acts upon that mass. Mass is the measure of the amount of matter in a body. Mass is denoted using m or M.

Explanation:

the different between mass and weight is that the weight is the measure of the force of gravity on an object and the mass of an object will never change ,but the weight of an iteam can change based on its location